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Features and Benefits
* * * * * * * * * * * Chopper stabilized amplifier stage Optimized for BDC motor applications New miniature package / thin, high reliability package Operation down to 2.2V CMOS for optimum stability, quality, and cost Solid state switch Brushless DC motor commutation Speed sensing Linear position sensing Angular position sensing Current sensing
Applications
Ordering Information
Part No. US3881 US3881 Temperature Suffix E (-40C to 85C) L (-40C to 150C)
* Contact factory or Sale Representative for legacy temperature options
Functional Diagram
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Package SO (SOT-23) or UA (TO-92) SO (SOT-23) or UA (TO-92)
Description
The US3881 is a bipolar Hall effect sensor IC fabricated from mixed signal CMOS technology. It incorporates advanced chopper stabilization techniques to provide accurate and stable magnetic switch points. There are many applications for this sensor in addition to those listed above. The design, specifications, and performance have been optimized for commutation applications in 5V and 12V brushless DC motors. The output transistor will be latched on (BOP) in the presence of a sufficiently strong South pole magnetic field facing the marked side of the package. Similarly, the output will be latched off (BRP) in the presence of a North field.
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the presence of a sufficiently strong North pole magnetic field subjected to the marked face.
Note: Static sensitive device; please observe ESD precautions. Reverse VDD protection is not included. For reverse voltage protection, a 100W resistor in series with VDD is recommended. 3901003881 Rev. 012 Page 1
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US3881 Electrical Specifications
DC Operating Parameters: TA = 25, VDD = 12VDC (unless otherwise specified). Parameter Supply Voltage Supply Current Saturation Voltage Output Leakage Output Rise Time Output Fall Time Symbol Test Conditions VDD IDD VDS(on) IOFF tr tf Operating BBOP BTyp
Max 18 4.0 0.5
Units V mA V A

10.0
s s
0.18
US3881 Magnetic Specifications
Parameter
Operating Point Release Point Hysteresis Operating Point Release Point Hysteresis
Symbol Test Conditions
BOP BRP Bhys BOP BRP Bhys
EUA,ESO 25 & 85C, Vdd=2.2 & 18 volts DC EUA,ESO 25 & 85C, Vdd=2.2 & 18 volts DC EUA,ESO 25 & 85C, Vdd=2.2 & 18 volts DC LUA, LSO 25 & 150C, Vdd=2.2 & 18 volts DC LUA,LSO 25 & 150C, Vdd=2.2 & 18 volts DC LUA,LSO 25 & 150C, Vdd=2.2 & 18 volts DC
Min
1.0 -9.0 5.5 1.0 -9.0 5.5
Typ
5.0 -5.0 10.0 5.0 -5.0 10.0
Max
9.0 -1.0 12.0 9.0 -1.0 12.0
Units
mT mT mT mT mT mT
Absolute Maximum Ratings
Supply Voltage (Operating), VDD Supply Current (Fault), IDD Output Voltage, VOUT Output Current (Fault), IOUT Power Dissipation, PD Operating Temperature Range, TA Storage Temperature Range, TS Maximum Junction Temp, TJ 18V 50mA 18V 50mA 100mW -40 to 150C -65 to 150C 175C
Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does not assume any liability arising from the use of any product or application of any product or circuit described herein.
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Performance Graphs
Typical Magnetic Switch Points vs. Vdd
12.5 10.0 7.5 Field Strength (mT) 5.0 2.5 0.0 -2.5 -5.0 -7.5 -10.0 -12.5 0.0 5.0 10.0 Vdd (V) 15.0 20.0 3881
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Performance Graphs
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Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage, which, in bipolar devices, is a major source of temperature sensitive drift. CMOS makes this advanced technique possible. The CMOS chip is also much smaller than a bipolar chip, allowing very sophisticated circuitry to be placed in less space. The small chip size also contributes to lower physical stress and less power consumption.
Applications
If reverse supply protection is desired, use a resistor in series with the VDD pin. The resistor will limit the Supply Current (Fault), IDD, to 50 mA. For severe EMC conditions, use the application circuit below.
Installation
Consider temperature coefficients of Hall IC and magnetics, as well as air gap life time variations. Observe temperature limits during wave soldering.
Applications Examples
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Physical Characteristics
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Reliability Information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave soldering with usual (63/37 SnPb-) solder (melting point at 183degC). The following test methods are applied:
* * *
IPC/JEDEC J-STD-020A (issue April 1999) Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices CECC00802 (issue 1994) Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102 Solderability
For all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature profile etc) additional classification and qualification tests have to be agreed upon with Melexis. The application of Wave Soldering for SMD's is allowed only after consulting Melexis regarding assurance of adhesive strength between device and board. For more information http://www.melexis.com/ on manufacturability/solderability see quality page at our website:
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2002 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
Phone: +32 13 67 04 95 E-mail: sales_europe@melexis.com
All other locations:
Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com
QS9000, VDA6.1 and ISO14001 Certified
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