SMD code SMBJ40A
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.
SMBJ40A is a part number in our tables
SMBJ40A
- What it is
- TVS diode
- Maker
- DOWO, Good-Ark, Hottech, JieJie, ProTek Devices, SOCAY, Taitron Components, Vishay, WeEn Semiconductors, HXY, YFW, Bourns, Diodes Incorporated, EIC Semiconductor, Fagor Electronica, High diode Semiconductor, Leimao Electronic Technology, Lite-On Semiconductor, Lucky Forest, Rectron, Ruilong Yuan Electronics, SGS-Thomson Microelectronics, STMicroelectronics, 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.
Codes printed on it
Each maker prints its own code, and each code has a page of its own.
- MRDOWO, SMB
- MRGood-Ark, SMBDatasheet for SMBJ40A, Good-Ark, opens in a new tab
- MRHottech, SMBDatasheet for SMBJ40A, Hottech, opens in a new tab
- MRJieJie, SMBDatasheet for SMBJ40A, JieJie, opens in a new tab
- MRProTek Devices, SMBDatasheet for SMBJ40A, ProTek Devices, opens in a new tab
- MRSOCAYDatasheet for SMBJ40A, SOCAY, opens in a new tab
- MRTaitron ComponentsDatasheet for SMBJ40A, Taitron Components, opens in a new tab
- MRVishay, SMBDatasheet for SMBJ40A, Vishay, opens in a new tab
- B040AJWeEn Semiconductors, SMBDatasheet for SMBJ40A, WeEn Semiconductors, opens in a new tab
- MRHXY, SMBDatasheet for SMBJ40A, HXY, opens in a new tab
- MRYFW, SMBDatasheet for SMBJ40A, YFW, opens in a new tab
- MRBourns, SMB
- MRDiodes Incorporated, SMB
- 6548EIC Semiconductor, SMB
- KBFagor Electronica, SMB
- BCRHigh diode Semiconductor, SMB
- MRLeimao Electronic Technology, SMB
- MRLite-On Semiconductor, SMB
- MRLucky Forest, SMB
- TB40ARectron, SMB
- MRRuilong Yuan Electronics, SMB
- CUJSGS-Thomson Microelectronics, SMB
- CUJSTMicroelectronics, SMB
- BJ40ASecos, SMB
- MRSocay Electronics, SMB
- MRStarHope, SMB
- MRStarsea Electronic, SMB
- 40ASynSemi, SMB
- MRTaiwan Semiconductor, SMB
- CRVishay, SMB
- MRYint Electronics, SMB
The only part printed SMBJ40A in our tables
TSMBJ40A
- What it is
- TVS diode
- Maker
- Galaxy Microelectronics
- Package
- SMB
- Pins
- 2
- Details
- 40V, 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.
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