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I am trying to identify a SMD diode that is used in a PFC circuit on a SMPS power supply board from a Hisense 50" smart TV. The diode is connected on a IDP2301 (multi-mode PFC and LLC controller) IC. There are 3 diodes with the same markings, each connected to one of the gate driver outputs of the IC.

The markings on the diode are:
A1 (horizontal)
W6n (vertical)

I think "A1" is a "type" marking, but I am not sure which diode "A1" refers to. The closest code I found was "A2", which relates to a 1N4148 diode (data from Vishay website and datasheets).

The length of the diode body is 2.2mm. The closest match to this is: SOD-123.

Can anyone identify this diode?

UPDATE (19/05/23)

I found this service manual: https://pdfcoffee.com/hisense-noblex-ea32x5000-chasis-mtk5655epdj-pdf-free.html

The service manual has a schematic with a IDP2301 IC on it. The diodes on the gate drivers (HSGD, LGD AND PFCGD) are all: 1N4148W.

SMD diode - A1 marking code

SMD diode in circuit

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  • \$\begingroup\$ If you need to replace it, just go with a 400V SOD-123 type. Should be good enough for a PFC circuit. \$\endgroup\$ May 18, 2023 at 18:31

2 Answers 2

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Possibly a 1N4001 type of diode (similar to M1 etc.).

I suggest you look up the datasheet for the chip and look at the typical schematic.

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Also possibly one of these:

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