simple diode question

[yukanti]

which is the best to replace 1N4003?
1N4002 or 1N4004?<p>thanks

[bridgen]

The difference between diodes of the 1N4000 series is in their reverse voltage figure. <p>1N4001 = 50V
1N4002 = 100
1N4003 = 200
1N4004 = 400
1N4005 = 600
1N4006 = 800
1N4007 = 1000<p>If in doubt about the reverse voltage your diode will encounter in your application use the 1N4004.

[cato]

I think there is probably an increase in parasitic capacitance with the increase in reverse voltage capability. Therefore, if response or switching time is important, you may need to take the capcitance into consideration.

[Bernius1]

Cato, you're absolutely right, but I don't think that signal or junction capacitance are involved with either the 1N4000 series, or other common switching diodes, like 1N4148. If it is, it's probably a mis-applied replacement for a signal diode. I'm not in disagreement, just seeing the larger target.

[terri]

Almost any Si or Ge diode will exhibit varicap characteristics when reverse-biased. Even LEDs.<p>However, in any application where the original part was a 1N4003, I doubt this is a real consideration.<p>[ March 26, 2005: Message edited by: terri ]</p>