SMD code 4D-
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.
65 parts are printed 4D-
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.
MA81SOD-1232 pins, PanNot recordedSOD-1232 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOD-123
- Pins
- 2
- Details
- C-diode: VHF-Band-S, 25V, <1,5pF(6V)
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MMBL914HPTSOD-3232 pins, Chenmko EnterpriseNot recordedSOD-3232 pinsChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOD-323
- Pins
- 2
- Details
- Diode: Sw, 100V, 200mA, Vf<1V(10mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MMBV3401SOT-233 pins, onsemiNot recordedSOT-233 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- VHF pin diode
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
MMBV3401LT1SOT-233 pins, onsemiNot recordedSOT-233 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
MMSZ2V7SOD-123Zener diode, 2 pins, EIC SemiconductorZener diodeSOD-1232 pinsEIC Semiconductor
- What it is
- Zener diode
- Maker
- EIC Semiconductor
- Package
- SOD-123
- Pins
- 2
- Details
- Zener Voltage Regulators MMSZxxxT1G Series, SZMMSZxxxT1G Series
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MMVL3401SOD-323PIN diode, 2 pins, onsemiPIN diodeSOD-3232 pinsonsemi
- What it is
- PIN diode
- Maker
- onsemi
- Package
- SOD-323
- Pins
- 2
- Details
- PIN-diode: VHF-Sw, 20V, 20mA, <1pF, <0,7Ω(10mA/100MHz)
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
MMVL3401T1SOD-3232 pins, onsemiNot recordedSOD-3232 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOD-323
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: This part.
PT7M824SSESOT-353Voltage supervisor, 5 pins, Diodes IncorporatedVoltage supervisorSOT-3535 pinsDiodes Incorporated
- What it is
- Voltage supervisor
- Maker
- Diodes Incorporated
- Package
- SOT-353
- Pins
- 5
- Details
- Voltage detector IC: 2.93V±1%, ±Reset PPO, WD
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3111N341ASOT-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
- CMOS-IC: Voltage Detector 3.4V±2.0%, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3117K341CDFNVoltage supervisor, RicohVoltage supervisorDFNNot recordedRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.4V±1%, -Reset PPO, Sense
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3131N44ECSOT-233 pins, Nisshinbo Micro DevicesNot recordedSOT-233 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 4,4V, Reset Open drain output, 240ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R5105N421CSOT-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: 4.2V±1%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RH5RL44AASOT-893 pins, Nisshinbo Micro DevicesNot recordedSOT-893 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-89
- Pins
- 3
- Details
- VR-IC: 4,4V±2,5%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RN5RL44AASOT-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: 4,4V±2,5%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RN5VD34CASOT-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
- CMOS-IC: Voltage Detector 3.4V, Reset Open drain 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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
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.
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.
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.
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.
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