SMD code FM in DFN
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.
3 parts in DFN are printed FM
Not sure which one you have?
Answer up to 4 quick questions and these 29 parts are ranked, with a meter test that settles it. It works on a dead part too.
AX6607-25Z6DFNLDO regulator, AXElite TechnologyLDO regulatorAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 2.5V±2%, 600mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R3114K181CDFNVoltage supervisor, RicohVoltage supervisorRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±0.8%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3134K21ECDFNVoltage supervisor, RicohVoltage supervisorRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.1V±1.8%, -Reset PPO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
12 more parts have no package on record. Nothing rules them out, so they stay.
TC4-1WX+RF transformer, Mini-CircuitsRF transformerMini-Circuits
- What it is
- RF transformer
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- RF transformer, 3-800 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
AAT3221IJS-2.4LDO regulator, SkyworksLDO regulatorSkyworks
- What it is
- LDO regulator
- Maker
- Skyworks
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 2.4V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
APE880045TY5PLDO regulator, Advanced Power ElectronicsLDO regulatorAdvanced Power Electronics
- What it is
- LDO regulator
- Maker
- Advanced Power Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 4.5V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BD48L26GVoltage supervisorVoltage supervisorNot recorded
- What it is
- Voltage supervisor
- Maker
- Not recorded
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage Detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD4931FVEVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 3,1V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD4931GVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 3,1V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU46K444GVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.4V±1%, -Reset PPO, Rdt=400ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127C34ANRVoltage supervisor, IXYSVoltage supervisorIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.4V±0.8%, -Reset PPO, -MR, 50ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127N34FNRVoltage supervisor, IXYSVoltage supervisorIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.4V±0.8%, +Reset ODO, -MR, 50ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MIC2211-1.5/2.8BMLLDO regulator, MicrelLDO regulatorMicrel
- What it is
- LDO regulator
- Maker
- Micrel
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vo1/Vo2=1.5V(150mA)/2.8V(300mA)±1%, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RP300K27BCVoltage supervisor, RicohVoltage supervisorRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.7V±1%, +Reset PPO, -MR, Rdt=100ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC7SH125GFNXPNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Bus buffer gate with 3-state output
- 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.
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.
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.
Codes that begin with FM
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 13 more parts.
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