SMD code C51
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.
21 parts are printed C51
Not sure which one you have?
Answer up to 4 quick questions and these 21 parts are ranked, with a meter test that settles it. It works on a dead part too.
3.0SMC51CASMCTVS diode, 2 pins, JieJieTVS diodeSMC2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMC
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10BJ51CASMBTVS diode, 2 pins, JieJieTVS diodeSMB2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10BJ51CA-AUSMBTVS diode, 2 pins, JieJieTVS diodeSMB2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10SMBJ51CASMBTVS diode, 2 pins, UN SemiconductorTVS diodeSMB2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=51.0V, Vbr=56.70..62.70V, Ipp=12.2A, 1000W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
88C51-AF5SOT-23-5Voltage supervisor, 5 pins, UnisonicVoltage supervisorSOT-23-55 pinsUnisonic
- What it is
- Voltage supervisor
- Maker
- Unisonic
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 5.1V±2%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BV-SMCJ51ASMCTVS diode, 2 pins, Bencent ElectronicsTVS diodeSMC2 pinsBencent Electronics
- What it is
- TVS diode
- Maker
- Bencent Electronics
- Package
- SMC
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=51.0V, Vbr=56.70..62.70V, Ipp=18.20A, 1500W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
BZG03-C51SMAZener diode, 2 pins, EIC SemiconductorZener diodeSMA2 pinsEIC Semiconductor
- What it is
- Zener diode
- Maker
- EIC Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Z-diode: 51V±5%, Izt=10mA, Zzt=25Ω, 1,25W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CM7P611C-51-TSOT-23Voltage supervisor, 3 pins, Canaan MicroelectronicsVoltage supervisorSOT-233 pinsCanaan Microelectronics
- What it is
- Voltage supervisor
- Maker
- Canaan Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 5.1V±2%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE61CC2501MRSOT-23Voltage supervisor, 3 pins, Heermicr SemicconductorVoltage supervisorSOT-233 pinsHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7025MCM5R1SOT-23-5Voltage supervisor, 5 pins, Heermicr SemicconductorVoltage supervisorSOT-23-55 pinsHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 2.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7025MCNR1SOT-23Voltage supervisor, 3 pins, Heermicr SemicconductorVoltage supervisorSOT-233 pinsHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7025MCPR1SOT-89Voltage supervisor, 3 pins, Heermicr SemicconductorVoltage supervisorSOT-893 pinsHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 2.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LN809C2951MSOT-23Voltage supervisor, 3 pins, Shanghai Natlinear ElectronicsVoltage supervisorSOT-233 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.93V±1%, Reset PPO, Rdt=1..50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SMBJ-LC51SMBTVS diode, 2 pins, EIC SemiconductorTVS diodeSMB2 pinsEIC Semiconductor
- What it is
- TVS diode
- Maker
- EIC Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=57.5..70.1V, Vrwm=51V, 6.6A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMCG51SMCGTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMCG2 pinsMicrosemi Integrated Products Division
- What it is
- TVS diode
- Maker
- Microsemi Integrated Products Division
- Package
- SMCG
- Pins
- 2
- Details
- TVS: 51V, 16.5A, 1500W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection 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.
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.
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.
Printed with a code easy to misread as C51
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 22 more parts.
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