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PulseGuard (R) Suppressors
Polymeric ESD Suppressors
PGB Series SOT23 Surface Mount ESD Suppressor
Product Overview
PulseGuard ESD Suppressors help protect sensitive electronic equipment against electrostatic discharge (ESD). They supplement the on-chip protection of integrated circuitry and are best suited for lowvoltage, high-speed applications where low capacitance is important. Data ports utilizing such high-speed protocols as USB 2.0, IEEE1394 and InfiniBandSM can benefit from this new technology. PulseGuard suppressors use polymer composite materials to suppress fast-rising ESD transients (as specified in IEC 61000-4-2 and MIL-STD-883E).
Features
* Ultra-low capacitance * Low leakage current * Fast response time * 2-lines of protection * Bi-directional * Withstands multiple ESD strikes * Standard JEDEC SOT23 outline * Compatible with pick-and-place processes * Available in 3,000 piece reels
4
PULSEGUARD(R) SUPPRESSORS PIECES PER REEL 3,000
177
Typical Applications
* * * * * * Servers Laptop/Desktop Computers Network Hardware Computer Peripherals Digital Cameras External Storage
Physical Specifications
Materials:
Body: Glass Epoxy Terminations: Tin-Lead
Soldering Parameters:
Wave solder -- 260C, 10 seconds maximum Reflow solder -- 260C, 30 seconds maximum
Operating Temperature Range:
-65C to 125C
Electrical Characteristics
Trigger Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,000V typical Clamping Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150V typical Rated Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24VDC max Capacitance2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.055pF Response Time1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1ns Leakage Current3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1nA ESD Pulse Withstand . . . . . . . . . . . . . . . . . . . . . 1,000 pulses minimum
1
Ordering Information
CATALOG NUMBER PGB002ST23WR
Design Consideration
Because of the fast rise-time of the ESD transient, placement of PulseGuard suppressors is a key design consideration. To achieve optimal ESD suppression, the devices should be placed on the circuit board as close to the source of the ESD transient as possible. Install PulseGuard suppressors directly behind the connector so that they are the first board-level circuit component encountered by the ESD transient. They are connected from signal/data line to ground.
Notes: 1. 8 kV direct discharge method, per IEC 61000-4-2. 2. Measured at 1 MHz. 3. Measured at 6 VDC. Testing at fast ESD pulse rates (1-20Hz) may cause a change in leakage current performance (6A, max).
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PulseGuard (R) Suppressors
Polymeric ESD Suppressors
PGB Series SOT23 Surface Mount ESD Suppressor
Generalized PulseGuard Suppressor Response to ESD
(Positive and Negative Polarity ESD Pulses)
Trigger Voltage Voltage (V)
Generalized I-V Curve
(Positive and Negative Polarity ESD Pulses)
Trigger Voltage Current (A)
Clamping Voltage
Clamping Voltage Voltage (V)
Time (ns)
Definitions
Trigger Voltage: The measured peak voltage across the ESD suppressor before it transitions from high to low resistance. It is manifested as a "spike" before the clamping voltage is achieved. This voltage is typically well below the damage threshold of on-chip IC protection. Clamping Voltage: The voltage level to which the ESD impulse voltage is reduced. This is the voltage that the suppressor holds at, until the ESD transient energy is dissipated. ESD Impulse Voltage: Also known as the ESD Threat Voltage. This is the voltage that is "zapped" into the circuit. Voltages generated by people can exceed 15 kV. The IEC 61000-4-2 defines four levels of impulse voltage for testing purposes: DIRECT DISCHARGE 2 kV 4 kV 6 kV 8 kV
Capacitance vs. Frequency
70 ** Note: 1,000 fF = 1 pF
Capacitance (fF)
60
50
40 0.5 1.0 1.5 2.0
Frequency (GHz)
SEVERITY LEVEL 1 2 3 4
AIR DISCHARGE 2 kV 4 kV 8 kV 15 kV
DESCRIPTION
MEASUREMENT (MM) 0.06 1.50 4.00 1.02 3.23 4.00 2.46 0.30 8.00
Carrier Tape Specifications
Parts are delivered on 7" (178mm) reel, plastic carrier tape
Tt Dd
+ +
Ct - Cover tape thickness Dd - Drive hole diameter Ds - Drive hole spacing
Ds
+ +
Pd - Pocket depth Ph - Pocket height Ps - Pocket spacing
Tw Ph
Pd
+
Pw - Pocket width Tt - Carrier tape thickness Tw - Carrier tape width
+
Ps Pw Ct
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Next
Previous
PulseGuard (R) Suppressors
Polymeric ESD Suppressors
PGB Series SOT23 Surface Mount ESD Suppressor
Test Set-up for IEC 61000-4-2 Waveform, 2kV-15kV
Device under test Tek P6156 Probe (Voltage measurement) KeyTek pulser 2,000- 15,000 V Brown tip (x100)
x10
Faraday cage
Ground return
x10
Tektronic TDS 684B
4
PULSEGUARD(R) SUPPRESSORS
Blue tip (x10) .5 ohm shunt (10-5 ohms in parallel) Tek P6156 Probe (Current measurement)
Reference Schematics:
Recommended Pad Layout:
Device Dimensions:
2.24 (0.088")
Equivalent Circuit:
a
1
b
2.032 (0.080") 2.997 (0.118")
+
d
3 2
+
c
e
a b * Dimension "a" is: 0.066 (.026") * Dimension "b" is: 0.076 (.030")
A SOLDER METHOD Wave Solder Reflow Solder INCH 0.050 0.050 MM 1.27 1.27 INCH 0.040 0.040
B MM 1.016 1.016 INCH 0.050 0.040
C MM 1.27 1.01 INCH 0.090 0.080
D MM 2.29 2.032 INCH 0.150 0.140
E MM 3.81 3.56
Note: Pin 3 (common) is typically connected to chassis ground. However, since PulseGuard suppressors are bi-directional, thex system voltage bus can also be used as the ESD "dump".
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