SMD code -MR
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.
123 parts are printed -MR
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
RT9715BGFMSOP-8Load switch, 8 pins, RichtekLoad switchMSOP-88 pinsRichtek
- What it is
- Load switch
- Maker
- Richtek
- Package
- MSOP-8
- Pins
- 8
- Details
- Power Switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
RT9818G-20GVLSOT-23Voltage supervisor, 3 pins, RichtekVoltage supervisorSOT-233 pinsRichtek
- What it is
- Voltage supervisor
- Maker
- Richtek
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage Detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SM6T305CASMB2 pins, STMicroelectronicsNot recordedSMB2 pinsSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- SMB
- Pins
- 2
- Details
- bi-directional transil 30V 600W
- Source
- Published code list
Is it dead? The meter test is below: This part.
SMBG40ASMBGTVS diode, 2 pins, VishayTVS diodeSMBG2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMBG
- Pins
- 2
- Details
- 600 W TVS diode, unidirectional
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJ40A-TSMBTVS diode, 2 pins, INPAQ TechnologyTVS diodeSMB2 pinsINPAQ Technology
- What it is
- TVS diode
- Maker
- INPAQ Technology
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=44.4..49.1V, Vrwm=40V, Ipp=9.3A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SODJ40A-SHSOD-123FTVS diode, 2 pins, LRCTVS diodeSOD-123F2 pinsLRC
- What it is
- TVS diode
- Maker
- LRC
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=20A(8.3ms), 200W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TSMB75ASMBTVS diode, 2 pins, VishayTVS diodeSMB2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=71.3..78.8V, Vrwm=64.1V, Ipp=5.8A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV02W400B-GSOD-123TVS diode, 2 pins, ComchipTVS diodeSOD-1232 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=3.10A, 200W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV06B400JSMB2 pins, ComchipNot recordedSMB2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- TVS: 40V, 5%, 9.3A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV06B400J-GSMBTVS diode, 2 pins, ComchipTVS diodeSMB2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=40.0V, Vbr=44.40..49.10V, Ipp=9.30A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
5 more parts have no package on record
SMBS40ATVS diode, Formosa MicrosemiTVS diodeNot recordedNot recordedFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=9.3A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SY8208AQNCDC-DC converterDC-DC converterNot recordedNot recordedNot recorded
- What it is
- DC-DC converter
- Maker
- Not recorded
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Step-Down Converter
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6109N22ANVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,2V, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6119N32ANRVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.2V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6120N22NVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±2%, N-ch, +Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
Is it dead? One meter test per kind
Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Integrated circuit
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- On the board
- this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TVS or ESD protection diode
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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