SMD code 21E
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.
21E on a chip resistor
1.62 MΩ
1.62 MΩ resistor, 1%
EIA-96 precision code: 21 stands for 162 in the E96 table, and the letter E is the multiplier, × 10 000. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 1.62 MΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 1.62 MΩ on the board is a fault. Open, or well above 1.62 MΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 1.62 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 (SOT-23-5, SOT-353, USP-6C), 21E is a part code instead. Those parts are listed below.
58 parts are printed 21E
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.
PPM523T201E0SOT-523P-channel MOSFET, 3 pins, PrisemiP-channel MOSFETSOT-5233 pinsPrisemi
- What it is
- P-channel MOSFET
- Maker
- Prisemi
- Package
- SOT-523
- Pins
- 3
- Details
- MOSFET, P-channel, 20 V, 0.8 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
PPMET20V08ESOT-523P-channel MOSFET, 3 pins, PrisemiP-channel MOSFETSOT-5233 pinsPrisemi
- What it is
- P-channel MOSFET
- Maker
- Prisemi
- Package
- SOT-523
- Pins
- 3
- Details
- MOSFET, P-channel, 20 V, 0.8 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
PPM523T201E0LSOT-523P-channel MOSFET, 3 pins, PrisemiP-channel MOSFETSOT-5233 pinsPrisemi
- What it is
- P-channel MOSFET
- Maker
- Prisemi
- Package
- SOT-523
- Pins
- 3
- Details
- MOSFET, P-channel, 20 V, 0.8 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
AP6213A-4HUHFGASOT-23-5LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-23-55 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGA1SOT-23-5LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-23-55 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGPSOT-353LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-3535 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGP1SOT-353LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-3535 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFPASOT-23-5LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-23-55 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA. +CE, PUR, CL fast
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFPA1SOT-23-5LDO regulator, 5 pins, Anwell SemiconductorLDO regulatorSOT-23-55 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA. +CE, PUR, CL fast
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
6 more parts have no package on record
AP6213A-4HUHFGSLDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA, +CE, PUR, fast autodis., H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGS1LDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA, +CE, PUR, fast autodis., H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGULDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGU1LDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA. +CE, PUR, CL fast, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGWLDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±2%, 300mA, +CE, PUR, fast autodis., H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP6213A-4HUHFGW1LDO regulator, Anwell SemiconductorLDO regulatorNot recordedNot recordedAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.75V±1%, 300mA, +CE, PUR, fast autodis., H-free
- 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.
P-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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.
Printed with a code easy to misread as 21E
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 21E
For a marking with its end worn or burnt off. Each code has a page of its own.
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