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SMD code SMBJ90A

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.

SMBJ90A is a part number in our tables

SMBJ90A

What it is
TVS diode
Maker
DOWO, Good-Ark, Hottech, JieJie, ProTek Devices, SOCAY, Taitron Components, Vishay, HXY, YFW, Bourns, Diodes Incorporated, EIC Semiconductor, High diode Semiconductor, Leimao Electronic Technology, Lite-On Semiconductor, Lucky Forest, Rectron, Ruilong Yuan Electronics, Secos, Socay Electronics, StarHope, Starsea Electronic, SynSemi, Taiwan Semiconductor, Yint Electronics
Package
SMB
Pins
2
Source
Manufacturer datasheet

Is it dead?

Diode range, from the protected line to ground, part lifted if you can.

Working, it reads

A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

Dead, it reads

  • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  • A reading both ways on a one-way part: leaky.
  • A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Datasheetfor SMBJ90A, opens in a new tab

Codes printed on it

Each maker prints its own code, and each code has a page of its own.

Not sure which one you have?

Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.

The only part printed SMBJ90A in our tables

TSMBJ90A

What it is
TVS diode
Maker
Galaxy Microelectronics
Package
SMB
Pins
2
Details
90V, 600W, Surface Mount TVS
Source
Manufacturer datasheet

Is it dead?

Diode range, from the protected line to ground, part lifted if you can.

Working, it reads

A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

Dead, it reads

  • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  • A reading both ways on a one-way part: leaky.
  • A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Datasheetfor TSMBJ90A, opens in a new tab

Was it this one?

Printed with a code easy to misread as SMBJ90A

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Did you find your part?

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