SMD code NZs
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 NZ was searched.
110 parts are printed NZs
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.
TPSMBJ100A-VRSMBTVS diode, 2 pins, HXYTVS diodeSMB2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TPSMBJ100CA-VRSMBTVS diode, 2 pins, HXYTVS diodeSMB2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
1SMB100ASMBTVS diode, 2 pins, onsemiTVS diodeSMB2 pinsonsemi
- What it is
- TVS diode
- Maker
- onsemi
- Package
- SMB
- Pins
- 2
- Details
- TVS: 100V, 3.7A, 500W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
1SMB100AT3SMBTVS diode, 2 pins, onsemiTVS diodeSMB2 pinsonsemi
- What it is
- TVS diode
- Maker
- onsemi
- Package
- SMB
- Pins
- 2
- Details
- 100V Bidirectional TVS Diode
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
3.0SMB120ASMBZener diode, 2 pins, Ruilong Yuan ElectronicsZener diodeSMB2 pinsRuilong Yuan Electronics
- What it is
- Zener diode
- Maker
- Ruilong Yuan Electronics
- Package
- SMB
- Pins
- 2
- Details
- Zener diode: 111.0..128.0V, Zzt=300, Izt=6.3mA, 3W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
6.0SMAJ100ASMATVS diode, 2 pins, UN SemiconductorTVS diodeSMA2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- 100V, 600W, Surface Mount TVS
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
AP7313-33SASOT-23LDO regulator, 3 pins, Diodes IncorporatedLDO regulatorSOT-233 pinsDiodes Incorporated
- What it is
- LDO regulator
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BF1005SRSOT-143N-channel MOSFET, 4 pins, InfineonN-channel MOSFETSOT-1434 pinsInfineon
- What it is
- N-channel MOSFET
- Maker
- Infineon
- Package
- SOT-143
- Pins
- 4
- Details
- MOSFET n-type: Dual gate, VHF, UHF, 7V, 30mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
BF1005SWSOT-343N-channel MOSFET, 4 pins, InfineonN-channel MOSFETSOT-3434 pinsInfineon
- What it is
- N-channel MOSFET
- Maker
- Infineon
- Package
- SOT-343
- Pins
- 4
- Details
- MOSFET n-type: Dual gate, VHF, UHF, 7V, 30mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
BFS20RSOT-233 pins, InfineonNot recordedSOT-233 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: RF, 30V, 25mA, 250mW, B=85, 450MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
BZT52-B20SSOD-323Zener diode, 2 pins, Taiwan SemiconductorZener diodeSOD-3232 pinsTaiwan Semiconductor
- What it is
- Zener diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-323
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZT52C27SOD-123Zener diode, 2 pins, DiotecZener diodeSOD-1232 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOD-123
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZT52C27WSOD-123Zener diode, 2 pins, JinYu semiconductorZener diodeSOD-1232 pinsJinYu semiconductor
- What it is
- Zener diode
- Maker
- JinYu semiconductor
- Package
- SOD-123
- Pins
- 2
- Details
- Zener diode: 25.65..28.35V, Izt=2mA, Zzt=80, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZX84C10CCWSOT-323Zener diode, 3 pins, JinYu semiconductorZener diodeSOT-3233 pinsJinYu semiconductor
- What it is
- Zener diode
- Maker
- JinYu semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Zener diode: Dual, 9.4..10.6V, Zzt=20, Izt=5mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CD214B-T100ASMBTVS diode, 2 pins, BournsTVS diodeSMB2 pinsBourns
- What it is
- TVS diode
- Maker
- Bourns
- Package
- SMB
- Pins
- 2
- Details
- TVS: 100V, 3.7A, 600W(1ms)
- Source
- Published code list
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.
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.
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.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn 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.
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