I want to ask about TVS Diode - PESD24VF1BALS-QYL. Surge test will be done for the circuit we designed. It should suppress a 250V 10A surge signal. However, the circuit should work the same up to 18V, but I am looking for a TVS diode that will start conducting before reaching 25V. Is PESD24VF1BALS-QYL suitable for this application?
Thanks
Best Regards
Welcome to the forum.
The datasheet specification you need to check is named “clamping voltage”. It will be dependant on parameters called out in the datasheet including which standards body test procedure they used.
A quick before coffee scan of this particular parts specs makes me think this part is a good choice.
Hi,
The PESD24VF1BALS-QYL has a standoff voltage of 24V and a clamping voltage above 25V, so it may not conduct before 25V as required. Consider a diode with a lower clamping voltage, like a 20V-rated TVS diode, for your application.
From the Data sheet, page 4 (reformatted for the forum)
VCL (clamping voltage)
@ ITLP = 8 A = 16.5V
@ ITLP = 16 A = 21V
(@ tp = 100 ns; Tamb = 25 °C)
[Non-repetitive current pulse, Transmission Line Pulse (TLP); square pulse; ANSI / ESD STM5.5.1-2008]
Closer scrutiny of the datasheet reveals that the device in question behaves rather more like a thyristor-type TVS device, rather than a zener-type
As such the device would be highly unsuitable for protection of power supplies or any similar circuit capable of supplying a sustained current into a fault once the device has been triggered.
