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MIC2950*/2951
150mA Low-Dropout Voltage Regulator
General Description
Features
The MIC2950 and MIC2951 are "bulletproof" micropower * High accuracy 3.3, 4.85, or 5V, guaranteed 150mA voltage regulators with very low dropout voltage (typically output 40mV at light loads and 250mV at 100mA), and very low * Extremely low quiescent current quiescent current. Like their predecessors, the LP2950 and * Low-dropout voltage LP2951, the quiescent current of the MIC2950/MIC2951 * Extremely tight load and line regulation increases only slightly in dropout, thus pro-longing battery * Very low temperature coefficient life. The MIC2950/MIC2951 are pin for pin compatible with * Use as regulator or reference the LP2950/LP2951, but offer lower dropout, lower * Needs only 1.5F for stability quiescent current, reverse battery, and automotive load dump protection. * Current and thermal limiting * Unregulated DC input can withstand -20V reverse The key additional features and protection offered include battery and +60V positive transients higher output current (150mA), positive transient protection for up to 60V (load dump), and the ability to survive an MIC2951 Version Only unregulated input voltage transient of -20V below ground * Error flag warns of output dropout (reverse battery). * Logic-controlled electronic shutdown The plastic DIP and SOIC versions offer additional system * Output programmable from 1.24 to 29V functions such as programmable output voltage and logic controlled shutdown. The 3-pin TO-92 MIC2950 is pincompatible with the older 5V regulators. Applications These system functions also include an error flag output * Automotive electronics that warns of a low output voltage, which is often due to * Voltage reference failing batteries on the input. This may also be used as a * Avionics power-on reset. A logic-compatible shutdown input is also available which enables the regulator to be switched on and * Cellular telephones off. This part may also be pin-strapped for a 5 V output, or * Battery powered equipment programmed from 1.24 V to 29 V with the use of two * SMPS post-regulator external resistors. * High efficiency linear power supplies Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com. ___________________________________________________________________________________________________________
Block Diagram
* MIC2950 Discontinuance September 2007. MM8 is a registered trademark of Micrel, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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MIC2950/2951
The MIC2950 is available as either an -05 or -06 version. The -05 and -06 versions are guaranteed for junction temperatures from -40C to +125C; the -05 version has a tighter output and reference voltage specification range over temperature. The MIC2951 is available as an -02 or -03 version.
The MIC2950 and MIC2951 have a tight initial tolerance (0.5% typical), a very low output voltage temperature coefficient which allows use as a low-power voltage reference, and extremely good load and line regulation (0.04% typical). This greatly reduces the error in the overall circuit, and is the result of careful design techniques and process control.
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Ordering Information
Part Number MIC2950-05BZ* MIC2950-06BZ* MIC2951-02BM MIC2951-03BM MIC2951-02BN** MIC2951-03BN MIC2951-03BMM MIC2951-3.3BM MIC2950-05YZ*/*** MIC2950-06YZ*/*** MIC2951-02YM*** MIC2951-03YM*** MIC2951-03YN*** MIC2951-03YMM*** MIC2951-3.3YM***
Note: * TO-92 Package discontinuance notification issued September 2007. End-of-life-buy offer thru December 31, 2007. Contact factory for additional information.
Voltage 5.0V 5.0V 5.0V 5.0V 5.0V 5.0V 5.0V 3.3V 5.0V 5.0V 5.0V 5.0V 5.0V 5.0V 3.3V
Accuracy 0.5% 1.0% 0.5% 1.0% 0.5% 1.0% 1.0% 1.0% 0.5% 1.0% 0.5% 1.0% 1.0% 1.0% 1.0%
Junction Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package 3-Pin TO-92 3-Pin TO-92 8-Pin SOIC 8-Pin SOIC 8-Pin Plastic DIP 8-Pin Plastic DIP 8-Pin MSOP 8-Pin SOIC 3-Pin TO-92 3-Pin TO-92 8-Pin SOIC 8-Pin SOIC 8-Pin Plastic DIP 8-Pin MSOP 8-Pin SOIC
Lead Finish Standard Standard Standard Standard Standard Standard Standard Standard Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
** Contact factory for Pb-Free version. *** Pb-Free RoHS compliant with `high-melting solder' exemption.
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MIC2950/2951
Pin Configuration
TO-92 (Z) (Bottom View)
DIP (N), SOIC (M), MM8(R) (MM) (Top View)
Pin Description
Pin No. MIC2950 3 Pin No. MIC2951 1 2 3 2 4 5 6 7 1 8 Pin Name OUT SNS SHDN GND ERR TAP FB IN Pin Function Regulated Output. Sense (Input): Output-voltage sensing end of internal voltage divider for fixed 5V operation. Not used in adjustable configuration. Shutdown/Enable (Input): TTL compatible input. High = shutdown, low or open = enable. Ground. Error Flag (Output): Active low, open-collector output (low = error, floating = normal). 3.3V/4.85/5V Tap: Output of internal voltage divider when the regulator is configured for fixed operation. Not used in adjustable configuration. Feedback (Input): 1.235V feedback from internal voltage divider's TAP (for fixed operation) or external resistor network (adjustable configuration). Unregulated Supply Input.
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MIC2950/2951
Absolute Maximum Ratings(1)
Input Supply Voltage (VIN) (5) .............................-20 to +60V Feedback Input Voltage (VFB) (6, 7) ....................-1.5 to +26V Shutdown Input Voltage (VSHDN) (6) ...................-0.3 to +30V Power Dissipation (PD) (4) ..........................Internally Limited Lead Temperature (soldering, 5 sec.)........................ 260C Storage Temperature ................................-65C to +150C ESD(3)
Operating Ratings(2)
Input Supply Voltage (VIN)................................+2.0 to +30V Junction Temperature (TJ) (4) MIC2950-05/MIC2950-06 ................... -40C to +125C MIC2951-02/MIC2950-03 ................... -40C to +125C
Electrical Characteristics(1)
VIN = 6V; IL = 100A; CL = 1F; TJ = 25C, bold values indicate -40C TJ +125C; Note 8; unless noted.
Parameter Output Voltage TJ = 25C Condition MIC295x-02/-05 (0.5%) MIC295x-03/06 (1%) MIC2951-3.3 (1%) MIC2951-4.8 (1%) Output Voltage -25C TJ +85C MIC295x-02/-05 (0.5%) MIC295x-03/-06 (1%) MIC2951-3.3 (1%) MIC2951-4.8 (1%) Output Voltage Over Full Temperature Range -40C to +125C MIC295x-02/-05 (0.5%) MIC295x-03/06 (1%) MIC2951-3.3 (1%) MIC2951-4.8 (1%) Output Voltage Over Load Variation MIC295x-02/-05 (0.5%), 100A IL 150mA, TJ TJ(max) MIC295x-03/-06 (1%), 100A IL 150mA, TJ TJ(max) MIC2951-3.3 (1%), 100A IL 150mA, TJ TJ(max) MIC2951-4.8 (1%), 100A IL 150mA, TJ TJ(max) Output Voltage Temperature Coefficient MIC295x-02/-05 (0.5%), Note 9 MIC295x-03/-06 (1%), Note 9 MIC2951-3.3 (1%), Note 9 MIC2951-4.8 (1%), Note 9 Line Regulation MIC295x-02/-05 (0.5%), Notes 10, 11 MIC295x-03/-06 (1%), Notes 10, 11 MIC2951-3.3 (1%), Notes 10, 11 MIC2951-4.8 (1%), Notes 10, 11 Min 4.975 4.950 3.267 4.802 4.950 4.925 3.251 4.777 4.940 4.900 3.234 4.753 4.930 4.880 3.221 4.733 20 50 50 50 0.03 0.04 0.04 0.04 Typ 5.000 5.000 3.300 4.850 Max 5.025 5.050 3.333 4.899 5.050 5.075 3.350 4.872 5.060 5.100 3.366 4.947 5.070 5.120 3.379 4.967 100 150 150 150 0.10 0.20 0.20 0.40 0.20 0.40 0.20 0.40 Units V V V V V V V V V V V V V V V V ppm/C ppm/C ppm/C ppm/C % % % % % % % %
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Parameter Load Regulation
Condition MIC295x-02/-05 (0.5%), 100A IL 150mA, Note 10 MIC295x-03/-06 (1%), 100A IL 150mA, Note 10 MIC2951-3.3 (1%), 100A IL 150mA, Note 10 MIC2951-4.8 (1%), 100A IL 150mA, Note 10
Min
Typ 0.04 0.10 0.10 0.10 40 250 300 40 250 320 40 250 320 120 1.7 4 100 1.7 4 120 1.7 4 280 150 280
Max 0.10 0.20 0.20 0.30 0.20 0.30 0.20 0.30 80 140 300 450 600 80 150 350 450 600 80 140 300 450 600 180 300 2.5 3.5 6 8 180 300 2.5 6 10 180 300 2.5 3.5 6 8 350 400 350 400 350 400
Units % % % % % % % % mV mV mV mV mV mV mV mV mV mV mV mV mV mV mV A A mA mA mA mA A A mA mA mA A A mA mA mA mA A A A A A A
Dropout Voltage
MIC295x-02/-03/-05/-06, IL = 100A, Note 12 MIC295x-02/-03/-05/-06, IL = 100mA, Note 12 MIC295x-02/-03/-05/-06, IL = 150mA, Note 12 MIC2951-3.3 (1%), IL = 100A, Note 12 MIC2951-3.3 (1%), IL = 100mA, Note 12 MIC2951-3.3 (1%), IL = 150mA, Note 12 MIC2951-4.8 (1%), IL = 100A, Note 12 MIC2951-4.8 (1%), IL = 100mA, Note 12 MIC2951-4.8 (1%), IL = 150mA, Note 12
Ground Current
MIC295x-02/-03/-05/-06, IL = 100A MIC295x-02/-03/-05/-06, IL = 100mA MIC295x-02/-03/-05/-06, IL = 150mA MIC2951-3.3 (1%), IL = 100A MIC2951-3.3 (1%), IL = 100mA MIC2951-3.3 (1%), IL = 150mA MIC2951-4.8 (1%), IL = 100A MIC2951-4.8 (1%), IL = 100mA MIC2951-4.8 (1%), IL = 150mA
Dropout Ground Current
MIC295x-02/-03/-05/-06, VIN = 4.5V, IL = 100A MIC2951-3.3 (1%), VIN = 3.0V, IL = 100A MIC2951-4.8 (1%), VIN = 4.3V, IL = 100A
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Parameter Current Limit Thermal Regulation Output Noise
Condition VOUT = 0V Note 13 10Hz to 100kHz, CL = 1.5F 10Hz to 100kHz, CL = 200F 10Hz to 100kHz, CL = 3.3F, 0.01F bypass Feedback to Output
Min
Typ 300 0.05 430 160 100
Max 400 450 0.20
Units mA mA %/W VRMS VRMS VRMS
Reference Voltage
MIC295x-02/-05 (0.5%) MIC295x-03/06 (1%) MIC2951-3.3 (1%) MIC2951-4.8 (1%)
1.220 1.200 1.210 1.200 1.210 1.200 1.210 1.200 1.190 1.185 1.185 1.185
1.235 1.235 1.235 1.235
1.250 1.260 1.260 1.270 1.260 1.270 1.260 1.270 1.270 1.285 1.285 1.285
V V V V V V V V V V V V nA nA ppm/C ppm/C ppm/C ppm/C nA/C
Reference Voltage
MIC295x-02/-05 (0.5%), Note 14 MIC295x-03/-06 (1%), Note 14 MIC2951-3.3 (1%), Note 14 MIC2951-4.8 (1%), Note 14
Feedback Bias Current Reference Voltage Temperature Coefficient MIC295x-02/05 (0.5%), Note 9 MIC295x-03/06 (1%), Note 9 MIC2951-3.3 (1%), Note 9 MIC2951-4.8 (1%), Note 9 Feedback Bias Current Temperature Coefficient Error Comparator (Flag) Output Leakage Current Error Comparator (Flag) Output Low Voltage (Flag) Error Comparator (Flag) Upper Threshold Voltage Error Comparator Lower Threshold Voltage Error Comparator Hysteresis VOH = 30V VIN = 4.5V, IOL = 200A Note 15 Note 15 Note 15 40 25
20 20 50 50 50 0.1 0.01 150 60 75 15
40 60
1.00 2.00 250 400
A A mV mV mV mV
95 140
mV mV mV
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Parameter Shutdown Input Logic Voltage
Condition MIC295x-02/-05 (0.5%) Low High MIC295x-03/-06 (1%) Low High MIC2951-3.3 (1%) Low High MIC2951-4.8 (1%) Low High
Min
Typ 1.3
Max 0.7
Units V V V V V V V V V V V V A A A A A A
2.0 1.3 0.7 2.0 1.3 0.7 2.0 1.3 0.7 2.0 30 450 3 50 100 600 750 10 20
Shutdown Input Current
VSHUTDOWN = 2.4V VSHUTDOWN = 30V
Regulator Output Current in Shutdown
Notes: 1. 2. 3. 4.
Note 7
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions are recommended. The junction-to-ambient thermal resistance of the TO-92 package is 180C/W with 0.4" leads and 160C/W with 0.25" leads to a PC board. The thermal resistance of the 8-pin DIP package is 105C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the SOIC (M) package is 160C/W. Junction-to-ambient thermal resistance for the MM8TM (MM) is 250C/W. The maximum positive supply voltage of 60V must be of limited duration (100ms) and duty cycle (1%). The maximum continuous supply voltage is 30V. When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to ground. VSHDN 2V, VIN 30V, VOUT = 0, with the FB pin connected to TAP. Additional conditions for 8-pin devices are VFB = 5V, TAP and OUT connected to SNS (VOUT = 5V) and VSHDN 0.8V. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
5. 6. 7. 8. 9.
10. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered in the specification for thermal regulation. 11. Line regulation for the MIC2951 is tested at 150C for IL = 1mA. For IL = 100A and TJ = 125C, line regulation is guaranteed by design to 0.2%. See Typical Performance Characteristics for line regulation versus temperature and load current. 12. Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account. 13. Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 50mA load pulse at VIN = 30V (1.25W pulse) for t = 10ms. 14. VREF VOUT (VIN - 1 V), 2.3V VIN 30V, 100A < IL 150mA, TJ TJMAX. 15. Comparator thresholds are expressed in terms of a voltage differential at the FB terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT /VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV x 5V/1.235V = 384mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. 16. Specification for packaged product only.
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MIC2950/2951
Typical Characteristics
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MIC2950/2951
Typical Characteristics (continued)
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MIC2950/2951
Typical Characteristics (continued)
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Application Information
Automotive Applications The MIC2950/2951 are ideally suited for automotive applications for a variety of reasons. They will operate over a wide range of input voltages, have very low dropout voltages (40mV at light loads), and very low quiescent currents. These features are necessary for use in battery powered systems, such as automobiles. They are also "bulletproof" devices; with the ability to survive both reverse battery (negative transients up to 20V below ground), and load dump (positive transients up to 60V) conditions. A wide operating temperature range with low temperature coefficients is yet another reason to use these versatile regulators in automotive designs External Capacitors A 1.5F (or greater) capacitor is required between the MIC2950/MIC2951 output and ground to prevent oscillations due to instability. Most types of tantalum or aluminum elec-trolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recomm-ended for operation below -25C. The important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.5F for current below 10mA or 0.15F for currents below 1 mA. Using the 8-pin versions at voltages below 5V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case situation of a 150mA load at 1.23V output (Output shorted to Feedback) a 5F (or greater) capacitor should be used. The MIC2950 will remain stable and in regulation with no load in addition to the internal voltage divider, unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. When setting the output voltage of the MIC2951 version with external resistors, a minimum load of 1A is recomm-ended. A 0.1F capacitor should be placed from the MIC2950/ MIC2951 input to ground if there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input. Stray capacitance to the MIC2951 Feedback terminal (pin 7) can cause instability. This may especially be a problem when using high value external resistors to set the output voltage. Adding a 100pF capacitor between Output and Feedback and increasing the output capacitor to at least 3.3F will remedy this.
Error Detection Comparator Output A logic low output will be produced by the comparator whenever the MIC2951 output falls out of regulation by more than approximately 5%. This figure is the comparator's built-in offset of about 60mV divided by the 1.235V reference voltage. (Refer to the block diagram on Page 1). This trip level remains "5% below normal" regardless of the programmed output voltage of the MIC2951. For example, the error flag trip level is typically 4.75V for a 5V output or 11.4V for a 12V output. The out of regulation condition may be due either to low input voltage, current limiting, thermal limiting, or overvolt-age on input (over 40V). Figure 1 is a timing diagram depicting the /ERROR signal and the regulated output voltage as the MIC2951 input is ramped up and down. The /ERROR signal becomes valid (low) at about 1.3V input. It goes high at about 5V input (the input voltage at which VOUT = 4.75--for 5.0V applications). Since the MIC2951's dropout voltage is load-dependent (see curve in Typical Performance Characteristics), the input voltage trip point (about 5V) will vary with the load current. The output voltage trip point does not vary with load. The error comparator has an open-collector output which requires an external pull-up resistor. Depending on system requirements, this resistor may be returned to the output or some other supply voltage. In determining a value for this resistor, note that while the output is rated to sink 200A, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1M. The resistor is not required if this output is unused. Programming the Output Voltage (MIC2951) The MIC2951 may be pin-strapped for 5V (or 3.3V or 4.85V) using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V Tap). Alternatively, it may be programmed for any output voltage between its 1.235V reference and its 30V maximum rating. An external pair of resistors is required, as shown in Figure 2. The complete equation for the output voltage is:
R VOUT = VREF x 1 + 1 + IFB R 1 R2
where VREF is the nominal 1.235 reference voltage and IFB is the feedback pin bias current, nominally -20nA. The minimum recommended load current of 1A forces an upper limit of 1.2M on the value of R2, if the regulator must work with no load (a condition often found in CMOS in standby), IFB will produce a 2% typical error in VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12A. 11
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Micrel, Inc. Reducing Output Noise In some applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only method by which noise can be reduced on the 3 lead MIC2950 and is relatively inefficient, as increasing the capacitor from 1F to 220F only decreases the noise from 430V to 160V rms for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick:
C BYPASS 1 2R 1 * 200Hz
MIC2950/2951
or about 0.01F. When doing this, the output capacitor must be increased to 3.3F to maintain stability. These changes reduce the output noise from 430V to 100Vrms for a100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages.
Figure 1. ERROR Output Timing
Figure 2. Adjustable Regulator
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MIC2950/2951
Typical Applications
5V Regulator with 2.5V Sleep Function
Wide Input Voltage Range Current Limiter
Low Drift Current Source
5V Current Limiter
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MIC2950/2951
Typical Applications
Regulator with Early Warning and Auxiliary Output
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MIC2950/2951
Typical Applications
Latch Off When Error Flag Occurs
Open Circuit Detector for 4mA to 20mA Current Loop
Regulator with State-of-Charge Indicator
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MIC2950/2951
Typical Applications
Low Battery Disconnect
System Over Temperature Protection Circuit
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MIC2950/2951
Schematic Diagram
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MIC2950/2951
Package Information
8-Pin SOIC (M)
PIN 1 DIMENSIONS: INCH (MM)
0.380 (9.65) 0.370 (9.40)
0.135 (3.43) 0.125 (3.18)
0.255 (6.48) 0.245 (6.22) 0.300 (7.62) 0.013 (0.330) 0.010 (0.254)
0.018 (0.57) 0.100 (2.54)
0.130 (3.30) 0.0375 (0.952)
0.380 (9.65) 0.320 (8.13)
8-Pin Plastic DIP (N)
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8-Pin MSOP (MM)
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0.090 (2.286) Radius, t yp. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143)
10 typ.
BOTTOM VIEW
0.085 (2.159) Diam . 0.185 (4.699) 0.175 (4.445) 5 t yp.
0.185 (4.699) 0.175 (4.445)
0.090 (2.286) typ.
Seat ing Plane 0.025 (0.635) Max Uncont rolled Lead Diamet er 0.500 (12.70) Min.
5 typ.
0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937 ) 0.0145 (0.3683 )
TO-92 (Z)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 1999 Micrel, Incorporated.
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