SMD code 1213
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.
1213 on a chip resistor
121 kΩ
121 kΩ resistor, 1%
121 followed by 3 zeros. Four digits is normally the 1% series.
Check it with a meter
Lift one end and measure across it. A good one reads 121 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 121 kΩ on the board is a fault. Open, or well above 121 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 121 kΩ. 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-223, SOT-363, SOIC-8), 1213 is a part code instead. Those parts are listed below.
6 parts are printed 1213
Not sure which one you have?
Answer up to 4 quick questions and these 6 parts are ranked, with a meter test that settles it. It works on a dead part too.
BL1213SOT-363Complementary MOSFET pair (N-channel and P-channel), 6 pins, Galaxy MicroelectronicsComplementary MOSFET pair (N-channel and P-channel)SOT-3636 pinsGalaxy Microelectronics
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Galaxy Microelectronics
- Package
- SOT-363
- Pins
- 6
- Details
- 20V, -20V, N+P Channel MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
BL1213-6LSOT-23-6Complementary MOSFET pair (N-channel and P-channel), 6 pins, Galaxy MicroelectronicsComplementary MOSFET pair (N-channel and P-channel)SOT-23-66 pinsGalaxy Microelectronics
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Galaxy Microelectronics
- Package
- SOT-23-6
- Pins
- 6
- Details
- 20V, -20V, N+P Channel MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
BL1213VSOT-563Complementary MOSFET pair (N-channel and P-channel), 6 pins, Galaxy MicroelectronicsComplementary MOSFET pair (N-channel and P-channel)SOT-5636 pinsGalaxy Microelectronics
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Galaxy Microelectronics
- Package
- SOT-563
- Pins
- 6
- Details
- 20V, -20V, N+P Channel MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
TBL1213SOT-363Complementary MOSFET pair (N-channel and P-channel), 6 pins, Galaxy MicroelectronicsComplementary MOSFET pair (N-channel and P-channel)SOT-3636 pinsGalaxy Microelectronics
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Galaxy Microelectronics
- Package
- SOT-363
- Pins
- 6
- Details
- 20V, -20V, N+P Channel MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
HT7121-3SOT-23-5LDO regulator, 5 pins, Holtek SemiconductorLDO regulatorSOT-23-55 pinsHoltek Semiconductor
- What it is
- LDO regulator
- Maker
- Holtek Semiconductor
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.1V±2%, 30mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LT1213CS8SOIC-88 pins, Analog DevicesNot recordedSOIC-88 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOIC-8
- Pins
- 8
- Details
- equivalent LT1213CN8
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
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.
Printed with a code easy to misread as 1213
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 1213
For a marking with its end worn or burnt off. Each code has a page of its own.
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