How fast is a transil

peranders · 20th October 2008, 02:02 PM

I'm right now a bit curious about how fast a transil is. When I read datasheets I read "very fast" but no value. Anyone that knows more?

peranders · 21st October 2008, 08:59 AM

I have found < 25 ns but I'll guess it's about pico seconds.

jneutron · 21st October 2008, 02:58 PM

GSI's databook states for the device 1N5555 - 1N5558:

""the response time is better that 1 nSec""

In their selection writeup, they state:

""in the case of induced lightning transients with rise times of 8 to 10 microseconds, an axial leaded AJTVS is acceptable. For transients with a faster rate of rise, such as an ESD pulse, a surface mount AJTVS is prefered since the typical lead inductance is less than 3 nH.""

In their spice simulations, they show about 200 pSec.

I'm confident they were unable to measure that...

Cheers, John

20th October 2008, 02:02 PM	#1
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	How fast is a transil I'm right now a bit curious about how fast a transil is. When I read datasheets I read "very fast" but no value. Anyone that knows more? __________________ /Per-Anders (my first name) or P-A as my friends call me

21st October 2008, 08:59 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I have found < 25 ns but I'll guess it's about pico seconds. __________________ /Per-Anders (my first name) or P-A as my friends call me

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21st October 2008, 02:58 PM	#3
jneutron diyAudio Member Join Date: Jan 2004 Location: away	GSI's databook states for the device 1N5555 - 1N5558: ""the response time is better that 1 nSec"" In their selection writeup, they state: ""in the case of induced lightning transients with rise times of 8 to 10 microseconds, an axial leaded AJTVS is acceptable. For transients with a faster rate of rise, such as an ESD pulse, a surface mount AJTVS is prefered since the typical lead inductance is less than 3 nH."" In their spice simulations, they show about 200 pSec. I'm confident they were unable to measure that... Cheers, John

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