How to do Lightning Surge protection ?

[PMoha.17]

Lightning surge protection level should meet the standard:

IEC61000-4-5

Common mode：2kV, normal mode：1kV

Malfunction：Level3

Destruction ：Level 1

Mainly concerned on the PoE PD part and the Antenna part

[FGUIT]

IEC 61000-4-5 standard specifies test setup, for unshielded symmetrical interconnection line and unshielded unsymmetrical interconnection lines.

For, unshielded symmetrical interconnection line, the surge is applied on each line in parallel, through R= (number of line)*40ohm + coupling device (C=0.5µF or GTD) on each line, and the ground.

For unshielded unsymmetrical interconnection lines, the surge is applied between lines, or line to ground, through R=40ohm + coupling device (C=0.5µF or GTD).

Test setups are shown on figures 9 to 12 of IEC 61000-4-5 standard. 

[PMoha.17]

Thanks for the reply..!!

Our concern is mainly on how to take care the necessary protections on the PCB to meet the above mentioned compliance

[FGUIT]

Below list of parts suitable for POE, providing several 8/20 µs surge capabilities :

• PEP01-5841,4 TVS bidirectionnal, Vrm=58V, Ipp 8/20 µs = 24A, 4 TVS bidirectionnal, SO-8 package
• SMA6J58CA, Vrm=58V, Ipp 8/20 µs = 32A, 1 TVS bidirectionnal, SMA package
• SMBJ58CA, Vrm=58V, Ipp 8/20 µs = 33A, 1 TVS bidirectionnal, SMB package
• SMCJ58CA, Vrm=58V, Ipp 8/20 µs = 83A, 1 TVS bidirectionnal, SMC package