SMD code CVM

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.

16 parts are printed CVM

Not sure which one you have?

Answer up to 4 quick questions and these 16 parts are ranked, with a meter test that settles it. It works on a dead part too.

DZ23C20SOT-23Zener diode, 3 pins, Diodes IncorporatedZener diodeSOT-233 pinsDiodes Incorporated
What it is
Zener diode
Maker
Diodes Incorporated
Package
SOT-23
Pins
3
Source
Published code list
Is it dead? The meter test is below: Zener diode.
Datasheetfor DZ23C20, opens in a new tab
IXD3235G1MDER-GUSP-6CDC-DC converter, 6 pins, IXYSDC-DC converterUSP-6C6 pinsIXYS
What it is
DC-DC converter
Maker
IXYS
Package
USP-6C
Pins
6
Details
DC/DC voltage converter IC: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD3235G1MDMR-GSOT-23-5DC-DC converter, 5 pins, IXYSDC-DC converterSOT-23-55 pinsIXYS
What it is
DC-DC converter
Maker
IXYS
Package
SOT-23-5
Pins
5
Details
DC/DC voltage converter IC: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
S-817A49ANB-CVMT2SOT-3434 pins, ABLICNot recordedSOT-3434 pinsABLIC
What it is
Not recorded
Maker
ABLIC
Package
SOT-343
Pins
4
Details
equivalent [4.9V LDO]
Source
Published code list
Is it dead? The meter test is below: Voltage regulator.
S-817A49ANB-CVMT2GSOT-3434 pins, Seiko InstrumentsNot recordedSOT-3434 pinsSeiko Instruments
What it is
Not recorded
Maker
Seiko Instruments
Package
SOT-343
Pins
4
Details
Linear voltage regulator IC: 4.9V±2%, 50mA
Source
Published code list
Is it dead? The meter test is below: Voltage regulator.
SMA91CASMATVS diode, 2 pins, Luguang Electronic TechnologyTVS diodeSMA2 pinsLuguang Electronic Technology
What it is
TVS diode
Maker
Luguang Electronic Technology
Package
SMA
Pins
2
Details
Transient voltage supressor: Vbr=86.5..95.5V, Vrwm=77.8V, 3.20A, 400W(1ms), Bidir.
Source
Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMCJ150CASMCTVS diode, 2 pins, Galaxy MicroelectronicsTVS diodeSMC2 pinsGalaxy Microelectronics
What it is
TVS diode
Maker
Galaxy Microelectronics
Package
SMC
Pins
2
Source
Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
Datasheetfor SMCJ150CA, opens in a new tab
XC9235G1MDER-GUSP-6CDC-DC converter, 6 pins, TorexDC-DC converterUSP-6C6 pinsTorex
What it is
DC-DC converter
Maker
Torex
Package
USP-6C
Pins
6
Details
DC/DC voltage converter IC: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9235G1MDMR-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: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
6 more parts have no package on record
- IXD3235G1MD0R-GDC-DC converter, IXYSDC-DC converterNot recordedNot recordedIXYS
  What it is
  DC-DC converter
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD3235G1MD4R-GDC-DC converter, IXYSDC-DC converterNot recordedNot recordedIXYS
  What it is
  DC-DC converter
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- S-817A49APF-CVMTF4 pins, ABLICNot recordedNot recorded4 pinsABLIC
  What it is
  Not recorded
  Maker
  ABLIC
  Package
  Not recorded
  Pins
  4
  Details
  equivalent [4.9V LDO]
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- S-817A49APF-CVMTFGSeiko InstrumentsNot recordedNot recordedNot recordedSeiko Instruments
  What it is
  Not recorded
  Maker
  Seiko Instruments
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: 4.9V±2%, 50mA
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- XC9235G1MD0R-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: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, CL
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC9235G1MD4R-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: PWM, st-dwn, 1.95V±2%, 600mA, 3MHz, Vin>1.8V, HSST, 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.

Zener diode

Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.

Working, it reads

About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.

Dead, it reads

The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.

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.
Watch for:: A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.

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.

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.

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.

Printed with a code easy to misread as CVM

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

6VM13

Codes that begin with CVM

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 11 more parts.

Did you find your part?

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