SMD code B51
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.
11 parts are printed B51
Not sure which one you have?
Answer up to 4 quick questions and these 11 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SB736A-51SOT-233 pins, NEC ElectronicsNot recordedSOT-233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: AF, 80V, 300mA, 200mW, B=110..180, 100MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB736AB51SOT-233 pins, RenesasNot recordedSOT-233 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
AAT60251B-S5SOT-23-5Voltage supervisor, 5 pins, Advanced Analog TechnologyVoltage supervisorSOT-23-55 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 5.1V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AAT60251B-S15SOT-343Voltage supervisor, 4 pins, Advanced Analog TechnologyVoltage supervisorSOT-3434 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-343
- Pins
- 4
- Details
- Voltage detector IC: 5.1V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BV-SMBJ51ASMBTVS diode, 2 pins, Bencent ElectronicsTVS diodeSMB2 pinsBencent Electronics
- What it is
- TVS diode
- Maker
- Bencent Electronics
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=51V, Vbr=56.7..65.2V, 7.3A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
HE61CC1501MRSOT-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: 1.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7015MCM5R1SOT-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: 1.5V±1%,+Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7015MCNR1SOT-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: 1.5V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7015MCPR1SOT-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: 1.5V±1%,+Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R1152N051BSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: Boost, CE, 5.1V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6115A632MRSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS-IC: VDet 3.2V, +Rst PPO, -Rst ODO, Wt=1.6s, Rt=3.13ms
- 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.
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.
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.
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 B51
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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