SMD code 52D
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.
52D on a chip resistor
340 kΩ
340 kΩ resistor, 1%
EIA-96 precision code: 52 selects 3.4 from the E96 series and D multiplies by 100000. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 340 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 340 kΩ on the board is a fault. Open, or well above 340 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 340 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-23-5, SOT-23, SMB), 52D is a part code instead. Those parts are listed below.
7 parts are printed 52D
Not sure which one you have?
Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.
AAT60052D-S2SOT-23Voltage supervisor, 3 pins, Advanced Analog TechnologyVoltage supervisorSOT-233 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±1%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AAT60052D-S5SOT-23-5Voltage supervisor, 5 pins, Advanced Analog TechnologyVoltage supervisorSOT-23-55 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 5.2V±1%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AAT60052D-S15SOT-143Voltage supervisor, 4 pins, Advanced Analog TechnologyVoltage supervisorSOT-1434 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-143
- Pins
- 4
- Details
- Voltage detector IC: 5.2V±1%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AAT60052D-S16SOT-89Voltage supervisor, 3 pins, Advanced Analog TechnologyVoltage supervisorSOT-893 pinsAdvanced Analog Technology
- What it is
- Voltage supervisor
- Maker
- Advanced Analog Technology
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±1%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
UM36512SSOT-23LDO regulator, 3 pins, Union SemiconductorLDO regulatorSOT-233 pinsUnion Semiconductor
- What it is
- LDO regulator
- Maker
- Union Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 1.2V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
2 more parts have no package on record
G5192DB12ULoad switch, 4 pins, Global Mixed-mode TechnologyLoad switchNot recorded4 pinsGlobal Mixed-mode Technology
- What it is
- Load switch
- Maker
- Global Mixed-mode Technology
- Package
- Not recorded
- Pins
- 4
- Details
- 25m RON 3A High Side One Channel Load Switch in 1mm X1mm WLCSP package
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
BAT15-025D4 pins, InfineonNot recordedNot recorded4 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- Not recorded
- Pins
- 4
- Details
- 4GHz schottky dual
- Source
- Published code list
Is it dead? The meter test is below: Schottky 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.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- 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 pinout and whether the enable is active high or low differ between parts. 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.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
- A reading the wrong way round as well: leaky.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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.
Printed with a code easy to misread as 52D
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 6 more parts.
Did you find your part?
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