SMD code 4 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.
12 parts in DFN are printed 4
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.
ESD4-DFNDFNESD protection diode, ProTek DevicesESD protection diodeProTek Devices
- What it is
- ESD protection diode
- Maker
- ProTek Devices
- Package
- DFN
- Pins
- Not recorded
- Details
- Low Capacitance TVS Array
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ET74LVC1G04YDFNETEKNot recordedETEK
- What it is
- Not recorded
- Maker
- ETEK
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
ET74LVC1G04Y1DFNETEKNot recordedETEK
- What it is
- Not recorded
- Maker
- ETEK
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
ET74LVC2G34YDFNETEKNot recordedETEK
- What it is
- Not recorded
- Maker
- ETEK
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
MC74VHC1G86MU2DFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input EXCLUSIVE-OR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MC74VHC1GT08MU1DFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input AND gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NL17SG04AMUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: Single inverter
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NL17SG14AMUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: Inverter with Schmitt-trigger input
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NLU1G86AMUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input EXCLUSIVE-OR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NLU1G86CMUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input EXCLUSIVE-OR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NLU1G86MUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input EXCLUSIVE-OR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NLX2G17CMUDFNonsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual buffer with Schmitt-trigger input
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
3 more parts have no package on record. Nothing rules them out, so they stay.
1SS400Switching diode, Formosa MicrosemiSwitching diodeFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
AOZ8S207BLS-01ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8S303BLS-24ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
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.
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.
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.
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.
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.
Codes that begin with 4
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 3,465 more parts.
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