4
\$\begingroup\$

Labeled D53 on PCB board for diode, SOT-89 package with marking "43."

It's part of a pulse-generator section on a DC power supply, it's right by an opto-coupler. This picture looks exactly like it, but I can't find any standard distributors in the U.S. I'm scared to throw something from Amazon.com on the board.

This Amazon link has a picture that looks exactly like the chip.

enter image description here

\$\endgroup\$
3
  • 4
    \$\begingroup\$ Add a photograph of the PCB and we stand a better chance. D53 is a component reference designator, so isn't going to help unless we have the component list. Do you know who the manufacturer is or anything else? \$\endgroup\$
    – Puffafish
    Sep 2 '20 at 14:30
  • 2
    \$\begingroup\$ SMD codes are Mfg specific unless off patent (generic) \$\endgroup\$
    – Tony Stewart EE75
    Sep 2 '20 at 14:32
  • \$\begingroup\$ Could it be a BAS40 of Diodes Incorporated? \$\endgroup\$
    – Raul Rosa
    Sep 2 '20 at 15:17
1
\$\begingroup\$

Page 27 has your answer on bottom right.
http://www.bitsavers.org/components/centralSemiconductor/_dataBooks/1997_Central_Semiconductor_SMD_Data_Book.pdf

I searched using D53 diode codes SOT-89. 43 is just for mfg traceability or date code last digits YM or YYWW

\$\endgroup\$
2
  • \$\begingroup\$ I teach how to search/ read, you can spoon feed regardless of the rules. -1 \$\endgroup\$
    – Tony Stewart EE75
    Sep 2 '20 at 15:35
  • \$\begingroup\$ @TonyStewartSunnyskyguyEE75 It's not about rules, its about creating a good answer. What happens to the answer when the link goes down? You might as well have not wasted your time. Thanks for fixing the answer \$\endgroup\$
    – Voltage Spike ♦
    Sep 2 '20 at 16:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.