SMD code 81C in SOT-23
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.
18 parts in SOT-23 are printed 81C
Not sure which one you have?
Answer up to 4 quick questions and these 20 parts are ranked, with a meter test that settles it. It works on a dead part too.
all SOT-23, 3 pins. What differs:
LMBZ5252BLT1GSOT-23Zener diode, LRCZener diodeLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode, VZ Min 22.8 V, VZ Nom 24 V, VZ Max 25.2 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5252BSOT-23Zener diode, Taitron ComponentsZener diodeTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5252BLSOT-23Zener diode, onsemiZener diodeonsemi
- What it is
- Zener diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- Zener Voltage Regulators MMBZ52xxBLT1G Series, SZMMBZ52xxBLT1G Series
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
S-LMBZ5252BLT1GSOT-23Zener diode, LRCZener diodeLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode, VZ Min 22.8 V, VZ Nom 24 V, VZ Max 25.2 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5252AN3SOT-23Zener diode, CYStekZener diodeCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 24 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5252BN3SOT-23Zener diode, CYStekZener diodeCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 24 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CMBZ5252BSOT-23MEI SemiNot recordedMEI Semi
- What it is
- Not recorded
- Maker
- MEI Semi
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 24V±5%, Izt=5.2mA, Zzt=33Ω, 300mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
CMPZ5252BSOT-23Zener diodeZener diodeNot recorded
- What it is
- Zener diode
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 24V±2.5%, Izt=5.2mA, Zzt=33Ω, 350mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
FDZS24LTSOT-23Zener diode, First SilionZener diodeFirst Silion
- What it is
- Zener diode
- Maker
- First Silion
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode: 22.80..25.20V, Izt=5.2mA, Zzt=33, 225mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
FMMD5252SOT-23Diodes IncorporatedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
FMMZ5252SOT-23Diodes IncorporatedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
HMBZ5252BSOT-23Hi-Sincerity MicroelectronicsNot recordedHi-Sincerity Microelectronics
- What it is
- Not recorded
- Maker
- Hi-Sincerity Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 24V±5%, Izt=5.2mA, Zzt=33Ω, 225mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
LMBZ5252BLSOT-23Zener diode, LRCZener diodeLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode: 22.8..25.2V, Izt=5.2mA, 225mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MMBZ5252SOT-23Zener diode, VishayZener diodeVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PMBZ5252BSOT-23PhiNot recordedPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- SOT-23
- Pins
- 3
- Details
- equivalent 1N5252B
- Source
- Published code list
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.
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.
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.
Printed with a code easy to misread as 81C
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 5 more parts.
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