SMD code UCs
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 UC was searched.
69 parts are printed UCs
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.
MMSZ4695-GSOD-123Zener diode, 2 pins, VishayZener diodeSOD-1232 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SOD-123
- Pins
- 2
- Details
- 8.7 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
PESDMC2XD5VBDFN0603-2ESD protection diode, 2 pins, PrisemiESD protection diodeDFN0603-22 pinsPrisemi
- What it is
- ESD protection diode
- Maker
- Prisemi
- Package
- DFN0603-2
- Pins
- 2
- Details
- ESD protection diode, 5 V working
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PESDUC2XD5VBDFN0603-2ESD protection diode, 2 pins, PrisemiESD protection diodeDFN0603-22 pinsPrisemi
- What it is
- ESD protection diode
- Maker
- Prisemi
- Package
- DFN0603-2
- Pins
- 2
- Details
- ESD protection diode, 5 V working
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PZS52C4V7M1QSOD-882Zener diode, 2 pins, PanjitZener diodeSOD-8822 pinsPanjit
- What it is
- Zener diode
- Maker
- Panjit
- Package
- SOD-882
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
S-LBZB84C3V3LT1GSOT-23Zener diode, 3 pins, LRCZener diodeSOT-233 pinsLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode, VZ Min 3.1 V, VZ Nom 3.3 V, VZ Max 3.5 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
PESDUC2XD5VBNDFN0603-2ESD protection diode, 2 pins, PrisemiESD protection diodeDFN0603-22 pinsPrisemi
- What it is
- ESD protection diode
- Maker
- Prisemi
- Package
- DFN0603-2
- Pins
- 2
- Details
- ESD protection diode, 5 V working
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
1.5SMC110SMCTVS diode, 2 pins, Fagor ElectronicaTVS diodeSMC2 pinsFagor Electronica
- What it is
- TVS diode
- Maker
- Fagor Electronica
- Package
- SMC
- Pins
- 2
- Details
- TVS diode, VRWM 89.2 V, unidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
2SC2404-CSOT-233 pins, PanNot recordedSOT-233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: RF, AM-FM, 30V, 15mA, 150mW, 650MHz, B=65..160
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC3931-CSOT-3233 pins, PanNot recordedSOT-3233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn: RF, FM/AM, 30V, 15mA, 150mW, B=65..160, 650MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4097PT-PSOT-323NPN transistor, 3 pins, Chenmko EnterpriseNPN transistorSOT-3233 pinsChenmko Enterprise
- What it is
- NPN transistor
- Maker
- Chenmko Enterprise
- Package
- SOT-323
- Pins
- 3
- Details
- NPN transistor: Sw, 40V, 500mA, 200mW, B=82..180, 250MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4627-CSOT-4163 pins, PanNot recordedSOT-4163 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-416
- Pins
- 3
- Details
- Si-npn: FM/AM RF, 30V, 15mA, 125mW, 650MHz, B=65..160
- Source
- Published code list
Is it dead? The meter test is below: This part.
4 more parts have no package on record
TVT6V8AWESD protection diode, Taitron ComponentsESD protection diodeNot recordedNot recordedTaitron Components
- What it is
- ESD protection diode
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- SMD TVS Arrays (Three Terminals)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
VBUS54CV-HSFESD protection diode, VishayESD protection diodeNot recordedNot recordedVishay
- What it is
- ESD protection diode
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 4-Line BUS-Port ESD Protection
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
2SC4627-JPanNot recordedNot recordedNot recordedPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn: FM/AM RF, 30V, 15mA, 125mW, 650MHz, B=65..160
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4973CNPN transistor, PanasonicNPN transistorNot recordedNot recordedPanasonic
- What it is
- NPN transistor
- Maker
- Panasonic
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: HF, 20V, 15mA, 650MHz, B=60..140
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
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.
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.
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