Zener diode wattage in amplifier power supply

[62vauxhall]

In an amplifier's power supply, if I were to use a 24V 5W IN5359B diode instead of 24V 3W IN5934B diode, would it cause a problem?

 

[laatsch55]

No...

 

[NavLinear]

The zener voltages match but the zener impedance and leakage currents differ based on ON semiconductor data sheets. The suggested replacement diode has a higher maximum DC current (good) than the one you're replacing and the leakage current is less (good) for the replacement. I've included both data sheets as a reference.

 

[Northwinds]

The zener voltages match but the zener impedance and leakage currents differ based on ON semiconductor data sheets. The suggested replacement diode has a higher maximum DC current (good) than the one you're replacing and the leakage current is less (good) for the replacement. I've included both data sheets as a reference.

Dennis, I want to eat your avatar's zener diode

 

[NavLinear]

Dennis, I want to eat your avatar's zener diode

You'll have to snatch that stick first. Or is it the other way around?

 

[62vauxhall]

The zener voltages match but the zener impedance and leakage currents differ based on ON semiconductor data sheets. The suggested replacement diode has a higher maximum DC current (good) than the one you're replacing and the leakage current is less (good) for the replacement. I've included both data sheets as a reference.

Thanks NL but I decided to leave well enough alone. I found out when replacing two resistors in close proximity to the diodes that the PC board had degenerated from the heat these things were throwing off - 250 & 215 degrees F respectively. The tab of one trace all but disintegrated when I removed a resistor lead so I had to jump it. Fortunately there was a point close by I could jump it to. The existing resistors were 2 watt and 3 watt tubular and are replaced now with 3 watt and 5 watt rectangular ceramic ones. The old ones looked like they were showing they're age but those new rectangular white resistors feel like they get just as hot.




The 3 watt diodes I asked about substituting for were not originals but recommended as substitutes for what are actually in there. However, the local vendor I frequent did not stock the 3 watt but did have 5 watt on hand. What's original to the amplifier are CZ-245, a round bead looking thing. I think they are 24.5 volt 2 watt.



They're mounted flush to the board and get very hot themselves. Even though I got the 5 watt ones, I'm not going to use them as I don't want to risk more damage to the board. Didn't measure the temp but at idle they felt as hot as the resistors and those were HOT but at least they were stood off the board whereas the diodes aren't.