SMD code LD3
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.
30 parts are printed LD3
Not sure which one you have?
Answer up to 4 quick questions and these 30 parts are ranked, with a meter test that settles it. It works on a dead part too.
BAT54S-CSOT-23Schottky diode, 3 pins, SeCoSSchottky diodeSOT-233 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAT54SGPSOT-23Schottky diode, 3 pins, ChenmkoSchottky diodeSOT-233 pinsChenmko
- What it is
- Schottky diode
- Maker
- Chenmko
- Package
- SOT-23
- Pins
- 3
- Details
- SCHOTTKY DIODE, 30 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAT54SLSOT-23Schottky diode, 3 pins, onsemiSchottky diodeSOT-233 pinsonsemi
- What it is
- Schottky diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- Dual Series Schottky Barrier Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAT54SN3SOT-23Schottky diode, 3 pins, CYStekSchottky diodeSOT-233 pinsCYStek
- What it is
- Schottky diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 30 V, 0.2 A Schottky diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
LBAT54SLT1GSOT-23Schottky diode, 3 pins, LRCSchottky diodeSOT-233 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Schottky diode, VR 30 V, IF 0.2 A, VF Max 0.4 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-LBAT54SLT1GSOT-23Schottky diode, 3 pins, LRCSchottky diodeSOT-233 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Schottky diode, VR 30 V, IF 0.2 A, VF Max 0.4 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SBAT54SLSOT-23Schottky diode, 3 pins, onsemiSchottky diodeSOT-233 pinsonsemi
- What it is
- Schottky diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- Dual Series Schottky Barrier Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
ADM6348-41ARTZSOT-23Voltage supervisor, 3 pins, Analog DevicesVoltage supervisorSOT-233 pinsAnalog Devices
- What it is
- Voltage supervisor
- Maker
- Analog Devices
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 4.1V±2.5%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BAT54SSOT-23Schottky diode, 3 pinsSchottky diodeSOT-233 pinsNot recorded
- What it is
- Schottky diode
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
BAT54SLT1SOT-233 pins, onsemiNot recordedSOT-233 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
BAT54TSGPSOT-23Schottky diode, 3 pins, Chenmko EnterpriseSchottky diodeSOT-233 pinsChenmko Enterprise
- What it is
- Schottky diode
- Maker
- Chenmko Enterprise
- Package
- SOT-23
- Pins
- 3
- Details
- SCHOTTKY DIODE, 30 V, 200 mA
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
BL8534CB3TR33SOT-23DC-DC converter, 3 pins, Shanghai BellingDC-DC converterSOT-233 pinsShanghai Belling
- What it is
- DC-DC converter
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 3.3V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BL8534CB3TR43SOT-23DC-DC converter, 3 pins, Shanghai BellingDC-DC converterSOT-233 pinsShanghai Belling
- What it is
- DC-DC converter
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 4.3V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BL8534CB3TR53SOT-23DC-DC converter, 3 pins, Shanghai BellingDC-DC converterSOT-233 pinsShanghai Belling
- What it is
- DC-DC converter
- Maker
- Shanghai Belling
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 5.3V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BL8534CB5TR33SOT-23-5DC-DC converter, 5 pins, Shanghai BellingDC-DC converterSOT-23-55 pinsShanghai Belling
- What it is
- DC-DC converter
- Maker
- Shanghai Belling
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PFM st-up, 3.3V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
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.
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.
Printed with a code easy to misread as LD3
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 4 more parts.
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