SMD code 20Z
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.
20Z on a chip resistor
0.158 Ω
0.158 Ω resistor, 1%
EIA-96 precision code: 20 stands for 158 in the E96 table, and the letter Z is the multiplier, × 0.001. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 0.158 Ω within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 0.158 Ω on the board is a fault. Open, or well above 0.158 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 0.158 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (USP-6B, SOT-23-6, SMB), 20Z is a part code instead. Those parts are listed below.
23 parts are printed 20Z
Not sure which one you have?
Answer up to 4 quick questions and these 23 parts are ranked, with a meter test that settles it. It works on a dead part too.
CZRA1200B-HFSMAZener diode, 2 pins, ComchipZener diodeSMA2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 200 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CZRMF1200A-HFSOD-123FZener diode, 2 pins, ComchipZener diodeSOD-123F2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOD-123F
- Pins
- 2
- Details
- 200 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMZ1200ASOD-123Zener diode, 2 pins, DOWOZener diodeSOD-1232 pinsDOWO
- What it is
- Zener diode
- Maker
- DOWO
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SZF1200ASOD-123FZener diode, 2 pins, LeiditechZener diodeSOD-123F2 pinsLeiditech
- What it is
- Zener diode
- Maker
- Leiditech
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TZT20ZWSOT-23Zener diode, 3 pins, Taitron ComponentsZener diodeSOT-233 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Details
- SMD Zener Diodes (Three Terminals) - 200mW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
02CZ20-ZSOT-23Zener diode, 3 pins, ToshibaZener diodeSOT-233 pinsToshiba
- What it is
- Zener diode
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 20.16..21.2V, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZD27C200PSOD-123FTVS diode, 2 pins, Fagor ElectronicaTVS diodeSOD-123F2 pinsFagor Electronica
- What it is
- TVS diode
- Maker
- Fagor Electronica
- Package
- SOD-123F
- Pins
- 2
- Details
- 160V, 150W, Surface Mount TVS
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
BZX78-C20SOT-893 pins, NexperiaNot recordedSOT-893 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- SOT-89
- Pins
- 3
- Details
- equivalent BZX87C20
- Source
- Published code list
Is it dead? The meter test is below: This part.
CZ1W20SOT-233 pins, CdiNot recordedSOT-233 pinsCdi
- What it is
- Not recorded
- Maker
- Cdi
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 20V±5%, 600mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
IXD1216B302ERUSP-6C6 pins, IXYSNot recordedUSP-6C6 pinsIXYS
- What it is
- Not recorded
- Maker
- IXYS
- Package
- USP-6C
- Pins
- 6
- Details
- Linear voltage regulator IC: 3.0V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
IXD1216B302MRSOT-23-55 pins, IXYSNot recordedSOT-23-55 pinsIXYS
- What it is
- Not recorded
- Maker
- IXYS
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: 3.0V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
IXD1216B302PRSOT-89-55 pins, IXYSNot recordedSOT-89-55 pinsIXYS
- What it is
- Not recorded
- Maker
- IXYS
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: 3.0V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
SZ1200ASMAZener diode, 2 pins, Anova TechnologiesZener diodeSMA2 pinsAnova Technologies
- What it is
- Zener diode
- Maker
- Anova Technologies
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 200 V, 1000 mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
2 more parts have no package on record
BZD2C200PZener diode, Fagor ElectronicaZener diodeNot recordedNot recordedFagor Electronica
- What it is
- Zener diode
- Maker
- Fagor Electronica
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 200V±5%, Izt=4mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
IXD1216B302QR-GIXYSNot recordedNot recordedNot recordedIXYS
- What it is
- Not recorded
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: 3.0V±2%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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.
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.
Printed with a code easy to misread as 20Z
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 1 more part.
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Open this in the search to correct a character or try another package.