Surge Stress
This stress pulse protocol, unlike ESD and EFT pulse protocol, has a longer period and delivers a higher power stress pulse. These pulse events are typically produced by power system switching (load changes, capacitor bank switching, power system shorting events). Surge and overvoltage protection may also be needed for USB VBUS pins which are exposed to transient during connector plugging/unplugging.
Lightning Induced Surge Stress
This type of stress pulse protocol covers three different phenomenas: 1: A directly coupled lightning strike to outdoor equipment and circuits. 2: A indirectly coupled lightning strike that creates electromagnetic fields which can induce transients in a local circuit. 3: Ground coupled disturbances which are created by lightning coupled to a grounding system of an electrical installation.
How To Protect From Surge/Lighting Stress
Transient Voltage Supressor (TVS) diodes, like the TPD1E10B06, have a IEC 61000-4-5 surge level of 6A (8/20micro seconds). These components can be used on Power and USB signals and will protect this class of signals from real time or simulated Surge/Lightning stresses.
When selecting Transient Voltage Supressor (TVS) diodes, the following are the key critical performance specification needed to achieve protection from Surge/Lightning stresses:
A: VCL (peak clamping voltage ) and IPP (peak current into system during stress) are the two main factors to be considered when choosing a Surge/Lightning protection component. Choose a protection device that has a lower VCL value than the max tolerance of the circuit being protected, and make sure that the IPP rating of the protection device exceeds the stress level standard the system is designed to pass.
B:The IEC 61000-4-5 has two surge pulse durations specified for IPP: 8/20 micro seconds and 10/1000 micro seconds, both of which define the shape of the current waveform. The latter value is dedicated to telecommunication lines. The IPP value related to the 8/20 micro second surge is larger than the one related to the 10/1000 micro second surge. During shorter surge periods, a protection device is able to take more peak power without sustaining damage, hence choosing the IPP related to the right surge period is essential for a cost and performance optimized system.
More information about Surge/Lightning stress voltages and Surge/Lightning stress procedures is available at:
Link to other ESD and latch Up topics:
- Human Body Model (HBM) Charged Device Model (CDM) Machine Model (MM) System Level ESD - IEC 61000-4-2 Electrical Fast Transients(EFT)/Burst - IEC 61000-4-4 Automotive ESD - AEC Q100 and ISO 10605 Latch-Up Electrical Overstress (EOS) ESD and Latch Up Testing and Qualification Procedures
For immediate consulting help on the above topics, contact (blog with) ESD Unlimited LLC staff at the
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