SMD code 33 in DFN
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.
9 parts in DFN are printed 33
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.
LD39020DTPU33RDFNLDO regulator, STMicroelectronicsLDO regulatorSTMicroelectronics
- What it is
- LDO regulator
- Maker
- STMicroelectronics
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
LDLN025PU33RDFNLDO regulator, STMicroelectronicsLDO regulatorSTMicroelectronics
- What it is
- LDO regulator
- Maker
- STMicroelectronics
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
BL8063CKETR33DFNLDO regulator, Shanghai BellingLDO regulatorShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8563CKETR33DFNLDO regulator, Shanghai BellingLDO regulatorShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BL8563CKFTR33DFNLDO regulator, Shanghai BellingLDO regulatorShanghai Belling
- What it is
- LDO regulator
- Maker
- Shanghai Belling
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LC1472CKETR33DFNLDO regulator, Shanghai LeadChip MicroelectronicsLDO regulatorShanghai LeadChip Microelectronics
- What it is
- LDO regulator
- Maker
- Shanghai LeadChip Microelectronics
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LDK130PU33RDFNLDO regulator, SGS-Thomson MicroelectronicsLDO regulatorSGS-Thomson Microelectronics
- What it is
- LDO regulator
- Maker
- SGS-Thomson Microelectronics
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LDLN025DFNSTMicroelectronicsNot recordedSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- DFN
- Pins
- 4
- Details
- 250 mA ultra low noise LDO (1.8V)
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RP110L091CDFNLDO regulator, RicohLDO regulatorRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 0.9V±1%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
6 more parts have no package on record. Nothing rules them out, so they stay.
BFCN-1525+RF filter, Mini-CircuitsRF filterMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, 1480-1570 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
EMF50C02VAComplementary MOSFET pair (N-channel and P-channel), Excelliance MOSComplementary MOSFET pair (N-channel and P-channel)Excelliance MOS
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Excelliance MOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 20 V, 4.8 A complementary N+P MOSFET pair
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
ERA-33SM+RF amplifier (MMIC), Mini-CircuitsRF amplifier (MMIC)Mini-Circuits
- What it is
- RF amplifier (MMIC)
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MMIC amplifier, DC-3 GHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: RF amplifier.
LD39130SJ33RLDO regulator, STMicroelectronicsLDO regulatorSTMicroelectronics
- What it is
- LDO regulator
- Maker
- STMicroelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
LDK320ADU33RLDO regulator, STMicroelectronicsLDO regulatorSTMicroelectronics
- What it is
- LDO regulator
- Maker
- STMicroelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
LL034BT2510DESD protection diode, Formosa MicrosemiESD protection diodeFormosa Microsemi
- What it is
- ESD protection diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection 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.
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.
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.
MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
RF amplifier
Voltage, board powered, on the output pin that the bias resistor or choke feeds.
Working, it reads
The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.
Dead, it reads
- Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
- Output pin at the full supply voltage: open inside, no current flowing.
- On the board:
- Measured on the board with power on; the bias network is part of the reading.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The figures depend on the part and its bias resistor. The datasheet gives both.
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.
Printed with a code easy to misread as 33
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 33
For a marking with its end worn or burnt off. Each code has a page of its own.
- 3374N2
- 3324P6
- 3302N1
- 3304N3
- 33242
- 3323
- 33041
- 3342
- 334N1
- 33121
- 3382P1
- 3321P1
- 3312B1
- 3315B1
- 3318B1
- 3320B1
- 3325B1
- 3328B1
- 3330B1
- 3333B1
- 3336B1
- 330631
- 33A13
- 33B8
- 338B1
- 339B1
- 33102E1
- 331042
- 33921
- 33F1
- 33G1
- 33S11
- 3331
- 33H1
Codes not listed here are printed on 137 more parts.
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