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Load dump test: Old vs new ISO standards

27 Feb 2014  | Soo Man Kim

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Using the new test condition, 10 continuous pulses affected the surge suppressing capability of the load dump TVS, as shown in the following three graphs:

Figure 5: Capabilities of Vishay's SN5S24A under the new load dump test conditions. Suffix "M" lines are multiple pulses using the new test condition standards (ISO-16750-2). Suffix "S" lines are single pulses as defined by the old test condition standards (ISO-7637-2).

These values are based on normal room temperature with the recommended pad size as listed in the datasheet, but the actual capability varies by PCB type, pad size, and temperature conditions.

Easy reference for load dump TVS vs. peak current (Amps)

Another way to select the correct load dump protection device is to refer to the maximum clamping current capability of the TVS and estimate the clamping current of the circuit based on:

 • Circuit condition
 • Ri = 2Ω
 • Peak voltage of alternator output in load dump = 100V
 • Target clamping voltage = 35V
 • Pulse width = 200ms
 • Pulse numbers = 10 pulses in 10 minutes
 • SM5S24A has 38A clamping capability in 10 pulses condition and its peak clamping current is 32.5A ((100V—35V) / 2Ω).

About the author
Soo Man Kim is with Vishay.

To download the PDF version of this article, click here.

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