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Moving edit content to wiki answer; added detail to TV description; minor formatting and cleanup. The actual model isn't given; possibly a HS50M16FWB, 50B16, EAX32X5000, or other. There are notable difference between the photos and the located service manual, though.
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Tim Williams
Tim Williams
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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 with MTK5655EPDJ chassis. The diode is connected onto 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

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

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

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 with MTK5655EPDJ chassis. The diode is connected to 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 is SOD-123.

SMD diode - A1 marking code

SMD diode in circuit

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David Fear
David Fear
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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

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?

SMD diode - A1 marking code

SMD diode in circuit

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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David Fear
David Fear
  • 73
  • 3

Identify a SMD diode used in a PFC circuit

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?

SMD diode - A1 marking code

SMD diode in circuit