SMD code CMH
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.
9 parts are printed CMH
Not sure which one you have?
Answer up to 4 quick questions and these 9 parts are ranked, with a meter test that settles it. It works on a dead part too.
PAM39SD33ALSOD-123FTVS diode, 2 pins, ProTek DevicesTVS diodeSOD-123F2 pinsProTek Devices
- What it is
- TVS diode
- Maker
- ProTek Devices
- Package
- SOD-123F
- Pins
- 2
- Details
- 400 Watt TVS Component
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF33AL-AUSOD-123FTVS diode, 2 pins, JieJieTVS diodeSOD-123F2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ33A-HSMATVS diode, 2 pins, Yint ElectronicsTVS diodeSMA2 pinsYint Electronics
- What it is
- TVS diode
- Maker
- Yint Electronics
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=33.0V, Vbr=36.70..40.60V, Ipp=7.50A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJ33CA-HSMBTVS diode, 2 pins, Yint ElectronicsTVS diodeSMB2 pinsYint Electronics
- What it is
- TVS diode
- Maker
- Yint Electronics
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=36.7..40.6V, Vrwm=33V, Ipp=11.3A, 600W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
XC6213B47AMRSOT-23-5LDO regulator, 5 pins, TorexLDO regulatorSOT-23-55 pinsTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: LDO, CE, 4.75V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC9265D381MR-GSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PFM st-dwn, 3.8V±2%, 50mA, +CE, CL
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
3 more parts have no package on record
XC6213B47A7R-GLDO regulator, TorexLDO regulatorNot recordedNot recordedTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC6213B47AGRLDO regulator, TorexLDO regulatorNot recordedNot recordedTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, 4.75V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC9265D3814R-GDC-DC converter, TorexDC-DC converterNot recordedNot recordedTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- DC/DC voltage converter IC: PFM st-dwn, 3.8V±2%, 50mA, +CE, CL
- 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.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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.
Printed with a code easy to misread as CMH
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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