SMD code NFs
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and NF was searched.
86 parts are printed NFs
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.
2BZX84C6V8SOT-23Zener diode, 3 pins, DiotecZener diodeSOT-233 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOT-23
- Pins
- 3
- Details
- SMD Planar Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2SCR552PSOT-89NPN transistor, 3 pins, ROHMNPN transistorSOT-893 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-89
- Pins
- 3
- Details
- Middle Power Transistor (30V / 3A)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SCR552P5SOT-89NPN transistor, 3 pins, ROHMNPN transistorSOT-893 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-89
- Pins
- 3
- Details
- Middle Power Transistors (30V / 3A)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BF2040SOT-143RF transistor, 4 pins, InfineonRF transistorSOT-1434 pinsInfineon
- What it is
- RF transistor
- Maker
- Infineon
- Package
- SOT-143
- Pins
- 4
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BZD84C6V8SOT-23Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZD84C6V8-Q1SOT-23Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZT52C2L7SLSOD-323Zener diode, 2 pins, Good-ArkZener diodeSOD-3232 pinsGood-Ark
- What it is
- Zener diode
- Maker
- Good-Ark
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode, VZ 2.7 V, 0.25 W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZT52C10-FLSOD-123FZener diode, 2 pins, Formosa MicrosemiZener diodeSOD-123F2 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZT52C10-FL-Q1SOD-123FZener diode, 2 pins, Formosa MicrosemiZener diodeSOD-123F2 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZT55C10SOD-123FZener diode, 2 pins, Formosa MicrosemiZener diodeSOD-123F2 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CH847SGPSOT-363Dual NPN transistor, 6 pins, ChenmkoDual NPN transistorSOT-3636 pinsChenmko
- What it is
- Dual NPN transistor
- Maker
- Chenmko
- Package
- SOT-363
- Pins
- 6
- Details
- NPN Muti-Chip General Purpose Amplifier, 45 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
KRC105SSOT-23Digital transistor (resistors built in), 3 pins, YFWDigital transistor (resistors built in)SOT-233 pinsYFW
- What it is
- Digital transistor (resistors built in)
- Maker
- YFW
- Package
- SOT-23
- Pins
- 3
- Details
- Digital transistor (bias resistors built in)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRC105SKRC105SSOT-23Digital transistor (resistors built in), 3 pins, YFWDigital transistor (resistors built in)SOT-233 pinsYFW
- What it is
- Digital transistor (resistors built in)
- Maker
- YFW
- Package
- SOT-23
- Pins
- 3
- Details
- Digital transistor (bias resistors built in)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRC106SSOT-23Digital transistor (resistors built in), 3 pins, KECDigital transistor (resistors built in)SOT-233 pinsKEC
- What it is
- Digital transistor (resistors built in)
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Digital transistor (bias resistors built in)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
1 more part has no package on record
HFCG-2000+RF filter, Mini-CircuitsRF filterNot recordedNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, 2100-10000 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
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.
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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
NPN transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
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.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
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 NFs
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 NFs
For a marking with its end worn or burnt off. Each code has a page of its own.
- NF241
- NFP2
- NFJ2
- NFH7
- NFGO1
- NF16
- NF1512
- NF1612
- NF1712
- NF1812
- NF1912
- NF2012
- NF2112
- NF2212
- NF2312
- NF2412
- NF2512
- NF2612
- NF2712
- NF2812
- NF2912
- NF3012
- NF3112
- NF3212
- NF3312
- NF3412
- NF3512
- NF3612
- NF3712
- NF3812
- NF3912
- NF4012
- NF4112
- NF4212
- NF4312
- NF4412
- NF4512
- NF4612
- NF4712
- NF4812
- NF4912
- NF5012
Codes not listed here are printed on 100 more parts.
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