SMD code M30
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.
M30 on a chip resistor
300 kΩ
300 kΩ resistor
The M is both the decimal point and the multiplier: 300 kΩ.
Check it with a meter
Lift one end and measure across it. A good one reads 300 kΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 300 kΩ on the board is a fault. Open, or well above 300 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 300 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-23-5, SOT-89, SOT-89-5), M30 is a part code instead. Those parts are listed below.
18 parts are printed M30
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
88N30-AF5SOT-23-5Voltage supervisor, 5 pins, UnisonicVoltage supervisorSOT-23-55 pinsUnisonic
- What it is
- Voltage supervisor
- Maker
- Unisonic
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 3.0V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP1152ADU30SOT-89-5LDO regulator, 5 pins, AKM SemiconductorLDO regulatorSOT-89-55 pinsAKM Semiconductor
- What it is
- LDO regulator
- Maker
- AKM Semiconductor
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±1.5%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8061CC3TR30SOT-89LDO regulator, 3 pins, Shanghai BellingLDO regulatorSOT-893 pinsShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 250mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
CMOZ3L0SOD-523Zener diode, 2 pins, Central SemiconductorZener diodeSOD-5232 pinsCentral Semiconductor
- What it is
- Zener diode
- Maker
- Central Semiconductor
- Package
- SOD-523
- Pins
- 2
- Details
- Z-diode: 2.85..3.15V, Izt=0.25mA, Zzt=1600Ω, 250mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
FN1L4LSOT-233 pins, NEC ElectronicsNot recordedSOT-233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 60V, 100mA, 200mW, R1/R2=10k/22k
- Source
- Published code list
Is it dead? The meter test is below: This part.
GN1L4LSOT-3233 pins, NEC ElectronicsNot recordedSOT-3233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-323
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 60V, 100mA, 200mW, R1/R2=10k/22k
- Source
- Published code list
Is it dead? The meter test is below: This part.
LC1218CC3TR30SOT-89LDO regulator, 3 pins, Shanghai LeadChip MicroelectronicsLDO regulatorSOT-893 pinsShanghai LeadChip Microelectronics
- What it is
- LDO regulator
- Maker
- Shanghai LeadChip Microelectronics
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 250mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LR8061CC3TR30SOT-89LDO regulator, 3 pins, LRCLDO regulatorSOT-893 pinsLRC
- What it is
- LDO regulator
- Maker
- LRC
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 250mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MA3X557SOT-23PIN diode, 3 pins, PanasonicPIN diodeSOT-233 pinsPanasonic
- What it is
- PIN diode
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Details
- PIN diode: Dual, UHF/SHF-AGC, 40V, 100mA, Vf=1V(100mA), 0.3pF
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
MA557SOT-23PIN diode, 3 pins, PanasonicPIN diodeSOT-233 pinsPanasonic
- What it is
- PIN diode
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Details
- PIN diode: Dual, UHF/SHF-AGC, 40V, 100mA, Vf=1V(100mA), 0.3pF
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
R1224N302MSOT-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: PWM step-down DC-DC converter, 3V, 180KHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3121N060ASOT-23-6Voltage supervisor, 6 pins, RicohVoltage supervisorSOT-23-66 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-23-6
- Pins
- 6
- Details
- Voltage detector IC: 6.0V±1.5%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RP504N301BSOT-23-5DC-DC converter, 5 pins, RicohDC-DC converterSOT-23-55 pinsRicoh
- What it is
- DC-DC converter
- Maker
- Ricoh
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/VFM st-dwn, 3.0V±1.5%, 600mA, 2.25MHz, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6366C302MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-dwn, 180kHz, 3.0V±2.5%, 1A, +CE, soft start
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6368C302MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-up, 3.0V±2.5%, 200mA, 180kHz, +CE, soft start
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
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.
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.
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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, and open the other way.
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: failed open.
- 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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
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 M30
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 M30
For a marking with its end worn or burnt off. Each code has a page of its own.
Did you find your part?
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