PulseGuard
Suppressors
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w w w . l i t t e l f u s e . c o m
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 low-
voltage, high-speed applications where low capacitance is important.
Data ports utilizing such high-speed protocols as USB 2.0, IEEE1394
and InfiniBand
SM
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)
Typical Applications
Servers
Laptop/Desktop Computers
Network Hardware
Computer Peripherals
Digital Cameras
External Storage
Electrical Characteristics
Trigger Voltage
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,000 V, typical
Clamping Voltage
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150V, typical
Rated Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24VDC, max
Capacitance
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.055 pF
Response Time
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 1ns
Leakage Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 1nA
ESD Pulse Withstand
1
. . . . . . . . . . . . . . . . . . . 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 (6A, max).
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
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.
PGB Series 0805 Surface Mount ESD Suppressor
PulseGuard
Suppressors
Polymeric ESD Suppressors
181
w w w . l i t t e l f u s e . c o m
4
PULSEGU
ARD
SUPPRESSORS
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:
SEVERITY LEVEL
1
2
3
4
AIR DISCHARGE
2 kV
4 kV
8 kV
15 kV
DIRECT
DISCHARGE
2 kV
4 kV
6 kV
8 kV
+
+
+
+
+
+
+
T
w
D
s
P
h
D
d
P
s
P
w
P
d
C
t
T
t
Carrier Tape Specifications
Parts are delivered on 7" (178mm) reel, paper carrier tape
DESCRIPTION
C
t
- Cover tape thickness
D
d
- Drive hole diameter
D
s
- Drive hole spacing
P
d
- Pocket depth
P
h
- Pocket height
P
s
- Pocket spacing
P
w
- Pocket width
T
t
- Carrier tape thickness
T
w
- Carrier tape width
MEASUREMENT (MM)
0.06
1.50
4.00
0.58
2.21
4.00
1.45
0.65
8.00
Trigger Voltage
Clamping Voltage
Time (ns)
Voltage
(V)
Trigger
Voltage
Clamping
Voltage
Voltage (V)
Current (A)
** Note: 1,000 fF = 1 pF
Frequency (GHz)
Capacitance (fF)
60
50
1.0
70
40
2.0
1.5
0.5
Generalized PulseGuard Suppressor Response to ESD
(Positive and Negative Polarity ESD Pulses)
Generalized I-V Curve
(Positive and Negative Polarity ESD Pulses)
Capacitance vs. Frequency
Polymeric ESD Suppressors
PGB Series 0805 Surface Mount ESD Suppressor
PulseGuard
Suppressors
182
w w w . l i t t e l f u s e . c o m
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".
+
+
d
e
f
b
c
a
g
f
0.44
(0.037")
2.03
(0.080")
1.27
(0.050")
* Dimension "a" is: 0.456 (.016")
* Dimension "b" is: 0.660 (.026")
b
a
2
3
4
5
1
6
Test Set-up for IEC 61000-4-2 Waveform, 2kV-15kV
Recommended Pad Layout:
Device Dimensions:
Equivalent Circuit:
Reference Schematics:
Device under test
Tek P6156 Probe (Voltage measurement)
Faraday cage
KeyTek pulser
Brown tip (x100)
2,000- 15,000 V
x10
Tektronic TDS 684B
Ground return
x10
Blue tip (x10)
.5 ohm shunt (10-5 ohms in parallel)
Tek P6156 Probe (Current measurement)
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
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