PulseGuard ® Suppressors Polymeric ESD Suppressors PGB Series 0805 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 • 4-lines of protection • Bi-directional • Withstands multiple ESD strikes • Based on industry standard 2012 package • Compatible with pick-and-place processes • Available in 1,000 and 5,000 piece reels (EIA-RS481) Physical Specifications Typical Applications • • • • • • Materials: Servers Laptop/Desktop Computers Network Hardware Computer Peripherals Digital Cameras External Storage Body: Glass Epoxy Terminations: Tin-Lead Soldering Parameters: Wave solder -- 260°C, 10 seconds maximum Reflow solder -- 260°C, 30 seconds maximum Operating Temperature Range: Electrical Characteristics 1 Trigger Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,000 V, typical Clamping Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150V, typical Rated Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24VDC, max Capacitance2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.055 pF Response Time1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 1ns Leakage Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 1nA ESD Pulse Withstand1 . . . . . . . . . . . . . . . . . . . 1,000 pulses, minimum 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 (6µA, max). 180 -65°C to 125°C Ordering Information CATALOG NUMBER PIECES PER REEL PGB0040805MR 1,000 PGB0040805NR 5,000 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. w w w. l i t t e l f u s e . c o m PulseGuard ® Suppressors Polymeric ESD Suppressors PGB Series 0805 Surface Mount ESD Suppressor Generalized PulseGuard Suppressor Response to ESD Generalized I-V Curve (Positive and Negative Polarity ESD Pulses) (Positive and Negative Polarity ESD Pulses) Trigger Voltage Current (A) Voltage (V) Trigger Voltage Clamping Voltage Clamping Voltage Voltage (V) Time (ns) 4 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. 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: SEVERITY LEVEL AIR DISCHARGE DIRECT DISCHARGE 1 2 kV 2 kV 2 4 kV 4 kV 3 8 kV 6 kV 4 15 kV 8 kV Parts are delivered on 7" (178mm) reel, paper carrier tape Tt Ds + + + + Tw + Pd Ct Ph + + Ps Pw Capacitance (fF) 60 50 40 0.5 1.0 1.5 2.0 Frequency (GHz) DESCRIPTION Carrier Tape Specifications Dd ** Note: 1,000 fF = 1 pF 70 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. PULSEGUARD® SUPPRESSORS Capacitance vs. Frequency Definitions MEASUREMENT (MM) Ct - Cover tape thickness 0.06 Dd - Drive hole diameter 1.50 Ds - Drive hole spacing 4.00 Pd - Pocket depth 0.58 Ph - Pocket height 2.21 Ps - Pocket spacing 4.00 Pw - Pocket width 1.45 Tt - Carrier tape thickness 0.65 Tw - Carrier tape width 8.00 w w w. l i t t e l f u s e . c o m 181 PulseGuard ® Suppressors Polymeric ESD Suppressors PGB Series 0805 Surface Mount ESD Suppressor Test Set-up for IEC 61000-4-2 Waveform, 2kV-15kV Device under test Tek P6156 Probe (Voltage measurement) Faraday cage Brown tip (x100) KeyTek pulser 2,000- 15,000 V x10 Ground return x10 Tektronic TDS 684B Blue tip (x10) .5 ohm shunt (10-5 ohms in parallel) Tek P6156 Probe (Current measurement) Reference Schematics: Equivalent Circuit: Device Dimensions: Recommended Pad Layout: 6 1 d 1.27 (0.050") e f + 0.44 (0.037") 2.03 (0.080") + 5 2 c g b f a 4 3 a b * Dimension “a” is: 0.456 (.016") * Dimension “b” is: 0.660 (.026") A B C D E F G SOLDER METHOD INCH MM INCH MM INCH MM INCH MM INCH MM INCH MM INCH MM Wave Solder 0.029 0.74 0.029 0.74 0.028 0.71 0.050 1.27 0.025 0.635 0.020 0.51 0.011 0.279 Reflow Solder 0.029 0.74 0.029 0.74 0.028 0.71 0.050 1.27 0.025 0.635 0.020 0.51 0.011 0.279 Note: Pins 2 and 5 (Common) are typically connected to chassis ground. However since PulseGuard suppressors are electrically bi-directional, the system voltage bus can also be used as the ESD “dump”. 182 w w w. l i t t e l f u s e . c o m