SMD code 34-
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.
83 parts are printed 34-
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.
EIA-96:340603Precision resistor (EIA-96 code), 2 pinsPrecision resistor (EIA-96 code)06032 pinsNot recorded
- What it is
- Precision resistor (EIA-96 code)
- Maker
- Not recorded
- Package
- 0603
- Pins
- 2
- Details
- EIA-96 precision chip resistor, code 34 stands for 221 in the E96 table; the printed mark adds a multiplier letter (34A = 221 Ohm, 34B = 2.21 kOhm)
- Source
- Added by hand from a published table
Is it dead? The meter test is below: Resistor.
2SC2412MPT-RSOT-723NPN transistor, 3 pins, Chenmko EnterpriseNPN transistorSOT-7233 pinsChenmko Enterprise
- What it is
- NPN transistor
- Maker
- Chenmko Enterprise
- Package
- SOT-723
- Pins
- 3
- Details
- NPN transistor: GP, 50V, 150mA, 250mW, B=180..390, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC5007-FBSOT-233 pins, NEC ElectronicsNot recordedSOT-233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: UHF/VHF, 20V, 65mA, 125mW, 7GHz, B=80..160
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5007FBSOT-4163 pins, RenesasNot recordedSOT-4163 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-416
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
BL8063CKETR34DFNLDO regulator, Shanghai BellingLDO regulatorDFNNot recordedShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8563CKETR34DFNLDO regulator, Shanghai BellingLDO regulatorDFNNot recordedShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8563CKFTR34DFNLDO regulator, Shanghai BellingLDO regulatorDFNNot recordedShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
ELM9834BBSOT-233 pins, ELM TechnologyNot recordedSOT-233 pinsELM Technology
- What it is
- Not recorded
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: 3.4V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
HMSZ5234BSOD-3232 pins, Hi-Sincerity MicroelectronicsNot recordedSOD-3232 pinsHi-Sincerity Microelectronics
- What it is
- Not recorded
- Maker
- Hi-Sincerity Microelectronics
- Package
- SOD-323
- Pins
- 2
- Details
- Z-diode: 6.2V±5%, Izt=20mA, Zzt=7Ω, 225mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
LC1472CKETR34DFNLDO regulator, Shanghai LeadChip MicroelectronicsLDO regulatorDFNNot recordedShanghai LeadChip Microelectronics
- What it is
- LDO regulator
- Maker
- Shanghai LeadChip Microelectronics
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LDK130PU34RDFNLDO regulator, SGS-Thomson MicroelectronicsLDO regulatorDFNNot recordedSGS-Thomson Microelectronics
- What it is
- LDO regulator
- Maker
- SGS-Thomson Microelectronics
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MUN5334DWSOT-3636 pins, MotorolaNot recordedSOT-3636 pinsMotorola
- What it is
- Not recorded
- Maker
- Motorola
- Package
- SOT-363
- Pins
- 6
- Details
- Si-n/p-Digi: Dual, Sw, 50V, 100mA, 200mW, R1/R2=22k/47k
- Source
- Published code list
Is it dead? The meter test is below: This part.
MUN5334DW1T1SOT-3636 pins, onsemiNot recordedSOT-3636 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Source
- Published code list
Is it dead? The meter test is below: This part.
NE68119-FBSOT-233 pins, California Eastern LaboratoriesNot recordedSOT-233 pinsCalifornia Eastern Laboratories
- What it is
- Not recorded
- Maker
- California Eastern Laboratories
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: UHF/VHF, 20V, 65mA, 125mW, 7GHz, B=80..160
- Source
- Published code list
Is it dead? The meter test is below: This part.
1 more part has no package on record
2SC5007RenesasNot recordedNot recordedNot recordedRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- Not recorded
- Pins
- Not recorded
- Details
- npn RF fT 7GHz @3V 7mA
- 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.
Resistor
Ohms range, across it, power off.
Working, it reads
Its marked value, within tolerance. On the board it reads the same or lower, because everything around it sits in parallel.
Dead, it reads
- Open: burnt, cracked, or eaten through by sulphur. The commonest failure.
- Well above its marked value: drifted high.
- On the board, clearly higher than its marked value: it has failed, since the board can only pull a reading down.
- On the board:
- A reading lower than marked on the board proves nothing; lift one end. A reading higher than marked is a fault even on the board.
- Compare:
- The same position on another channel usually carries the same value, and so does the matching part on another board.
- Watch for:
- A burnt resistor usually means the part it feeds pulled too much. Find that before fitting a new one, or it burns too. The marking, not the reading, says what to fit.
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.
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.
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.
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.
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