SMD code 120
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.
120 on a chip resistor
12 Ω
12 Ω resistor, 5%
12 followed by 0 zeros. Three digits is normally the 5% series. The same marking also reads as 12 pF on a capacitor or 12 µH on an inductor, and nothing in the code says which; the body of the part does.
Other readings of the same characters, most likely first
- 12 pF capacitor
- 12 µH inductor
Check it with a meter
Lift one end and measure across it. A good one reads 12 Ω within 5%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 12 Ω on the board is a fault. Open, or well above 12 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 12 Ω. 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-23, SMB), 120 is a part code instead. Those parts are listed below.
57 parts are printed 120
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.
IXD1415AA20MRSOT-23-6LDO regulator, 6 pins, IXYSLDO regulatorSOT-23-66 pinsIXYS
- What it is
- LDO regulator
- Maker
- IXYS
- Package
- SOT-23-6
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.30/2.80V±1%, 200mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
IXD1503P12APR-GSOT-89LDO regulator, 3 pins, IXYSLDO regulatorSOT-893 pinsIXYS
- What it is
- LDO regulator
- Maker
- IXYS
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 1.25V±20mV, 500mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
KTY82 / 120SOT-23Temperature sensor, 3 pins, NXPTemperature sensorSOT-233 pinsNXP
- What it is
- Temperature sensor
- Maker
- NXP
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KTY82-120SOT-233 pins, PhiNot recordedSOT-233 pinsPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- SOT-23
- Pins
- 3
- Details
- Therm-S: Temperature Sensor (-55..+150°C), R=980..1020Ω(+25°C)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KTY82/120SOT-233 pins, NXPNot recordedSOT-233 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-23
- Pins
- 3
- Details
- Thermal detector IC: Sensor, Rs=980..1020(25°C, 1mA)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LN7120FRSOT-23-5LDO regulator, 5 pins, Shanghai Natlinear ElectronicsLDO regulatorSOT-23-55 pinsShanghai Natlinear Electronics
- What it is
- LDO regulator
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.0V±2%, 70mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LN7120MRSOT-23LDO regulator, 3 pins, Shanghai Natlinear ElectronicsLDO regulatorSOT-233 pinsShanghai Natlinear Electronics
- What it is
- LDO regulator
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.0V±2%, 70mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MMF120ASOD-123FTVS diode, 2 pins, Shanghai SemitechTVS diodeSOD-123F2 pinsShanghai Semitech
- What it is
- TVS diode
- Maker
- Shanghai Semitech
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=120V, Vbr=133.0..153.0V, Ipp=0.9A, 200W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMA120SMATVS diode, 2 pins, EIC SemiconductorTVS diodeSMA2 pinsEIC Semiconductor
- What it is
- TVS diode
- Maker
- EIC Semiconductor
- Package
- SMA
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ120SMATVS diode, 2 pins, Sunmate SemiconductorTVS diodeSMA2 pinsSunmate Semiconductor
- What it is
- TVS diode
- Maker
- Sunmate Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- TVS: 120V, 1.9A, 400W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMBJ120SMBTVS diode, 2 pins, LittelfuseTVS diodeSMB2 pinsLittelfuse
- What it is
- TVS diode
- Maker
- Littelfuse
- Package
- SMB
- Pins
- 2
- Details
- TVS: 108..132V, 3.5A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
R1116N201DSOT-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: LDO, LN, CE, auto discharge, 2V±1.5%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R1160N201BSOT-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: LDO, CE, 2V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
SMBG120SMBGTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMBG2 pinsMicrosemi Integrated Products Division
- What it is
- TVS diode
- Maker
- Microsemi Integrated Products Division
- Package
- SMBG
- Pins
- 2
- Details
- TVS: 120V, 2.8A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
1 more part has no package on record
IXD1415AA207R-GLDO regulator, IXYSLDO regulatorNot recordedNot recordedIXYS
- What it is
- LDO regulator
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.30/2.80V±1%, 200mA, +CE
- 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.
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.
Did you find your part?
Open this in the search to correct a character or try another package.