TVS diodes for ESD protection - I need help

Andrea

Hello,
my current project involves a Prop and SIMCOM SIM908 (GSM/GPRS/GPS) module. All components ordered and are on the way.
SIMCOM recommendation is to use ESD protection on SIM card bus such as SMF05C or equivalent, and I'm not able to obtain it.

SMF05C General Spec:

Peak Pulse Power (tp = 8/20μs): 100 Watts
Peak Pulse Current (tp = 8/20μs): 8 A
ESD per IEC 61000-4-2 (Air) / ESD per IEC 61000-4-2 (Contact): 20 / 15kV
Reverse Stand-Off Voltage: 5V
Reverse Breakdown Voltage: 6V
Clamping Voltage: 9.8 V
Junction Capacitance:130 pF
Datasheet: http://www.semtech.com/images/datasheet/smf05c.pdf

Now my questions are:

- Can it be replaced with this one:

DIODE, TVS, 5V, 400W, UNI, 5%, SMA
Reverse Stand-Off Voltage Vrwm:5V
Breakdown Voltage Range:6.4V to 7V
Diode Configuration:Unidirectional
Peak Pulse Current Ippm:35A
Diode Case Style: DO-214AC
No. of Pins:2
Power Dissipation Pd:400W
SOURCE: http://www.ebay.com/itm/SMAJ5-0A-DIODE-TVS-5V-400W-SMA-UNI-5-x2pcs-/300610964578?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item45fdcf4c62

OR

Reverse Stand-Off Voltage Vrwm:5V
Clamping Voltage Range:9.8V-5A / 15.5V-23A
Diode Configuration:Unidirectional
Junction Capacitance:230-400 pF
Power Dissipation Pd:300W
SOURCE: http://www.ebay.com/itm/1-X-SMF5-0AT1G-TVS-DIODE-200W-5V-Pb-Free-/250980039305?pt=LH_DefaultDomain_0&hash=item3a6f937a89

OR maybe this one:

Fairchild Semiconductor 1500W 5V Transient Voltage Suppressor Diode, Part Number: SMCJ5V0A in SMC Package.

Reverse Stand-off Voltage Vrwm: 5V
Break Down Voltage Vbr: 6.4V min, 7.0V amx.
Peak Pulse Current Ippm: 163A
Reverse Leak Current Ir: 1mA
SMC Package

Detail Spec see Data Sheet at:

http://www.fairchildsemi.com/pf/SM/SMCJ5V0A.html

SOURCE:http://www.ebay.com/itm/Fairchild-1500W-TVS-Diode-5V-SMCJ5V0A-SMC-New-50pcs-/150207217200?pt=LH_DefaultDomain_0&hash=item22f90c3e30

- Can you suggest better option(s)?
- Do I rely need it(Can it be omitted from circuit)?

Once when I finish this project I'll share it with forum community.

Thank you in advance!!

Leon

It isn't essential, especially as you aren't likely to be replacing the SIM very often.

Andrea

Leon is always there to help me. Thank you sir!!!

It isn't essential...

That's the answer I was looking for!

Leon

If you are really paranoid about ESD when inserting the SIM, you could hold it in one hand and ground yourself to the system with the other hand.

frank freedman

Or fashion a small metal frame to system ground to go around the sim slot such that you make contact with it before the sim is in far enough to contact the interface pins.

FF