SMD code M3p
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.
The last letter, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and M3 was searched.
182 parts are printed M3p
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
BL8554CB3TR13SOT-23LDO regulator, 3 pins, Shanghai BellingLDO regulatorSOT-233 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 1.3V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB3TR23SOT-23LDO regulator, 3 pins, Shanghai BellingLDO regulatorSOT-233 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.3V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB3TR33SOT-23LDO regulator, 3 pins, Shanghai BellingLDO regulatorSOT-233 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB3TR43SOT-23LDO regulator, 3 pins, Shanghai BellingLDO regulatorSOT-233 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 4.3V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5ATR13SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5ATR23SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5ATR33SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5ATR43SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5BTR13SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5BTR23SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5BTR33SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8554CB5BTR43SOT-23-5LDO regulator, 5 pins, Shanghai BellingLDO regulatorSOT-23-55 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.3V±2%, 300mA. +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BZA868ALSOT-3535 pins, Philips SemiconductorsNot recordedSOT-3535 pinsPhilips Semiconductors
- What it is
- Not recorded
- Maker
- Philips Semiconductors
- Package
- SOT-353
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
BZD17C220PSOD-123FZener diode, 2 pins, Taiwan SemiconductorZener diodeSOD-123F2 pinsTaiwan Semiconductor
- What it is
- Zener diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener diode: 208..233V, Zzt=430, Izt=4mA, 800mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZX84C13TSOT-523Zener diode, 3 pins, Silicon-Based TechnologyZener diodeSOT-5233 pinsSilicon-Based Technology
- What it is
- Zener diode
- Maker
- Silicon-Based Technology
- Package
- SOT-523
- Pins
- 3
- Details
- zener 150mW 13V
- 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.
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.
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.
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.
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