SMD code 56- 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.
8 parts in SOT-23 are printed 56-
Not sure which one you have?
Answer up to 4 quick questions and these 40 parts are ranked, with a meter test that settles it. It works on a dead part too.
15 parts have no package on record. Nothing rules them out, so they stay.
74AUP1T14GWNXPNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Inverting Schmitt-trigger with voltage-level translator
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP1T14GXNXPNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Inverting Schmitt-trigger with voltage-level translator
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822N-26GIVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822N-26GSVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822N-26PIVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822N-26PSVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
CDZ55C56Zener diode, Crownpo TechnologyZener diodeCrownpo Technology
- What it is
- Zener diode
- Maker
- Crownpo Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 53.20..58.80V, Zzt=135, Izt=2.25mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CDZ55C56SZener diode, Crownpo TechnologyZener diodeCrownpo Technology
- What it is
- Zener diode
- Maker
- Crownpo Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 53.20..58.80V, Zzt=135, Izt=2.25mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CDZ55C56TZener diode, Crownpo TechnologyZener diodeCrownpo Technology
- What it is
- Zener diode
- Maker
- Crownpo Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 53.20..58.80V, Zzt=135, Izt=2.25mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRNC55C56-GZener diode, ComchipZener diodeComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 53.20..58.80V, Zt=135, Izt=5mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
EC95810N26C7IVoltage supervisor, E-CMOSVoltage supervisorE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
EC95810N26C7SVoltage supervisor, E-CMOSVoltage supervisorE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±2%, -Reset ODO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
FSD273TAZetexNot recordedZetex
- What it is
- Not recorded
- Maker
- Zetex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Varicaps
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
IXD5126C32A7R-GVoltage supervisor, IXYSVoltage supervisorIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.2V±0.8%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MM5Z4V3Zener diode, Fairchild SemiconductorZener diodeFairchild Semiconductor
- What it is
- Zener diode
- Maker
- Fairchild Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Published code list
Is it dead? The meter test is below: Zener 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.
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.
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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, and open the other way.
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.
- 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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
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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