UM50125 Datasheet, PDF (3/7 Pages) Union Semiconductor, Inc. – Single Line ESD Protection Diode Array

UM50125/50129
Electrical Characteristics
(T=25°C, Device for 12.0V Reverse Stand-off Voltage)
Parameter
Symbol
Conditions
Min Typ Max Unit
Reverse Stand-Off
Voltage
V_RWM
Reverse Breakdown
Voltage
V_BR
It = 1mA
16
12 V
18 V
Reverse Leakage Current
I_R
V_RWM = 12V, T=25°C
0.5 μA
Clamping Voltage
V_C
I_PP =5.9A, t_p = 8/20μS
23 V
Junction Capacitance
C_J
V_R = 0V, f = 1MHz
20 30 pF
Applications Information
Device Connection Options
UM50125/50129 ESD protection diode is designed to protect one data, I/O, or power supply line.
The device is unidirectional and may be used on lines where the signal polarity is above ground.
The cathode dot should be placed towards the line that is to be protected.
Circuit Board Layout Recommendations for Suppression of ESD
Good circuit board layout is critical for the suppression of ESD induced transients. The following
guidelines are recommended:
1. Place the TVS near the input terminals or connectors to restrict transient coupling.
2. Minimize the path length between the TVS and the protected line.
3. Minimize all conductive loops including power and ground loops.
4. The ESD transient return path to ground should be kept as short as possible.
5. Never run critical signals near board edges.
6. Use ground planes whenever possible. For multilayer printed-circuit boards, use ground
vias.
7. Keep parallel signal paths to a minimum.
8. Avoid running protection conductors in parallel with unprotected conductor.
9. Minimize all printed-circuit board conductive loops including power and ground loops.
10. Avoid using shared transient return paths to a common ground point.
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http://www.union-ic.com Rev.01 Mar. 2012
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