SMD code 3V3
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 3V3
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.
MM3Z3V3CW-P2-HFSOD-323Zener diode, 2 pins, ComchipZener diodeSOD-3232 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOD-323
- Pins
- 2
- Details
- 3.3 V 200 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
PESD3V3SOT-23ESD protection diode, 3 pins, ProTek DevicesESD protection diodeSOT-233 pinsProTek Devices
- What it is
- ESD protection diode
- Maker
- ProTek Devices
- Package
- SOT-23
- Pins
- 3
- Details
- Double ESD Protection Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TAR5S33SOT-23-5LDO regulator, 5 pins, ToshibaLDO regulatorSOT-23-55 pinsToshiba
- What it is
- LDO regulator
- Maker
- Toshiba
- Package
- SOT-23-5
- Pins
- 5
- Details
- TAR5S15 to TAR5S50 Point Regulators (Low-Dropout Regulator)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
SMBJ3.3ASMBTVS diode, 2 pins, HXYTVS diodeSMB2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
MZ0.5GN3V3SOD-80Zener diode, 2 pins, Master Instrument Corporation of ShanghaiZener diodeSOD-802 pinsMaster Instrument Corporation of Shanghai
- What it is
- Zener diode
- Maker
- Master Instrument Corporation of Shanghai
- Package
- SOD-80
- Pins
- 2
- Details
- Zener diode: 3.3V+-5%, Zzt=95, Izt=115mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PZM3.3NBSOT-233 pins, NXPNot recordedSOT-233 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-23
- Pins
- 3
- Details
- 3.3V 300mW Zener
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SMFJ3.3ASOD-123FTVS diode, 2 pins, Xiangtuo ElectronicsTVS diodeSOD-123F2 pinsXiangtuo Electronics
- What it is
- TVS diode
- Maker
- Xiangtuo Electronics
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=3.3..4.1V, Vbr=4.75V, Ipp=27.41A, 200W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TAR5S33USOT-3535 pins, ToshibaNot recordedSOT-3535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-353
- Pins
- 5
- Details
- VR-IC: LDO, CE, 3,3V±1%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
7 more parts have no package on record
LESD8LH3.3FN3T6GESD protection diode, LRCESD protection diodeNot recordedNot recordedLRC
- What it is
- ESD protection diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection diode, VRWM 3.3 V, IR @VRWM 0.1 μA, VBR Min 5.5 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
BZY55-C3V3Zener diode, Taiwan SemiconductorZener diodeNot recordedNot recordedTaiwan Semiconductor
- What it is
- Zener diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.47V, Izt=5mA, Zzt=85, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CDZ55C3V3Zener diode, Crownpo TechnologyZener diodeNot recordedNot recordedCrownpo Technology
- What it is
- Zener diode
- Maker
- Crownpo Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.47V, Zzt=85, Izt=5mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CDZ55C3V3SZener diode, Crownpo TechnologyZener diodeNot recordedNot recordedCrownpo Technology
- What it is
- Zener diode
- Maker
- Crownpo Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.47V, Zzt=85, Izt=5mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CTZ55C3V3Zener diode, Compact TechnologyZener diodeNot recordedNot recordedCompact Technology
- What it is
- Zener diode
- Maker
- Compact Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.47V, Izt=5mA, Zzt=85, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRNC55C3V3-GZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.4V, Zt=85, Izt=5mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRSC55C3V3-GZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.14..3.47V, Zt=85, Izt=5mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
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.
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.
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.
Codes that begin with 3V3
For a marking with its end worn or burnt off. Each code has a page of its own.
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