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Mac Classic Analogue Board - Replacement for DP8

Posted by: TheMightyMadman on 2022-10-08 14:04:46

Hi all,

I've got a Mac Classic analogue board with DP8 damaged due to electrolyte leakage.
It's used in the -12Vdc circuit, by the looks of things.
The schematic says "BY 73D", and the parts says "PH 73" or vice versa, but I can't find any information on either of these.
Does anyone know the proper part, or an equivalent please?

Many thanks,

Adam

Posted by: cheesestraws on 2022-10-08 14:36:27

"BY" is the Pro Electron type code for a silicon rectifier diode, for what that is worth. Can't find what the number 73 means.

Posted by: TheMightyMadman on 2022-10-08 14:58:40

"BY" is the Pro Electron type code for a silicon rectifier diode, for what that is worth. Can't find what the number 73 means.

Thank you 🙂 It might be a BYD73D, which is an ultra-fast low-loss controlled avalanche rectifier:

NXP - BYD73D

Buy BYD73D NXP ,Marking Code: 73DPH, Learn more about BYD73D RP40 (GW) Series - Powerline Regulated DC-DC Converters; Input Voltage (Vdc): 48V; Output Voltage (Vdc): 15V; 4:1 Wide Input Voltage Range; 40 Watts Regulated Output Power; 1.6kVDC Isolation; Over Current and Over Voltage Protection...

www.jotrin.com

I can't find a suitable supplier though, I'll keep looking.

Posted by: TheMightyMadman on 2022-10-09 04:00:26

Thank you 🙂 It might be a BYD73D, which is an ultra-fast low-loss controlled avalanche rectifier:

NXP - BYD73D

Buy BYD73D NXP ,Marking Code: 73DPH, Learn more about BYD73D RP40 (GW) Series - Powerline Regulated DC-DC Converters; Input Voltage (Vdc): 48V; Output Voltage (Vdc): 15V; 4:1 Wide Input Voltage Range; 40 Watts Regulated Output Power; 1.6kVDC Isolation; Over Current and Over Voltage Protection...

www.jotrin.com

I can't find a suitable supplier though, I'll keep looking.

Hi all,

I've found an old thread which seems to confirm that DP8 is a BYD73D.

What is DP8? - Macintosh Analog Board

It's been recommended to replace DP3, DP4 diodes which I am ordering. They look fine except the solder joints look burnt. What I can't find is DP8. It's a little diode maybe similar to DP3. I can't tell because it burned up. The 1st picture is just my board model. The 2nd shows DP8 under...

68kmla.org

The BYD73A seems to be readily available, but it's only a 50V part versus the BYD73A which is 200V.
I was hoping to get a few as spares, but I've resorted to buying a single BYD73D on eBay:

BYD73D Silicon Diode - CASE: Standard MAKE: Generic | eBay

Find many great new & used options and get the best deals for BYD73D Silicon Diode - CASE: Standard MAKE: Generic at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

I hope this helps!

Many thanks,

Adam