SMD code 28M
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.
28M on a chip resistor
28 MΩ
28 MΩ resistor
The M is both the decimal point and the multiplier: 28 MΩ.
Check it with a meter
Lift one end and measure across it. A good one reads 28 MΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 28 MΩ on the board is a fault. Open, or well above 28 MΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 28 MΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (USP-6B, SOT-23-5, SOT-353), 28M is a part code instead. Those parts are listed below.
25 parts are printed 28M
Not sure which one you have?
Answer up to 4 quick questions and these 25 parts are ranked, with a meter test that settles it. It works on a dead part too.
LDO regulator, all Anwell Semiconductor. What differs:
AP6213A-15DLNGASOT-23-55 pinsSOT-23-55 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGA1SOT-23-55 pinsSOT-23-55 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGPSOT-3535 pinsSOT-3535 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGP1SOT-3535 pinsSOT-3535 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNPASOT-23-55 pinsSOT-23-55 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA. -CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNPA1SOT-23-55 pinsSOT-23-55 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA. -CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNPPSOT-3535 pinsSOT-3535 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA. -CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNPP1SOT-3535 pinsSOT-3535 pins
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA. -CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
7 more parts have no package on record
AP6213A-15DLNGSNot recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA, -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGS1Not recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA, -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGUNot recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGU1Not recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA. -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGWNot recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA, -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNGW1Not recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±1%, 300mA, -CE, PDR, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-15DLNPSNot recordedNot recorded
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA, -CE, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
Printed with a code easy to misread as 28M
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 28M
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 40 more parts.
Did you find your part?
Open this in the search to correct a character or try another package.