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LDTD123YLT1G
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LRC Digital Transistors, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LDTD123YLT1G
LRC · Digital Transistors · SOT-23
LDTD123YLT1G from LRC, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BASE | input | Base input of the NPN bias-resistor transistor; the built-in input resistor R1 is 2.2 kΩ and the input voltage range is −5 V to +12 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor, with the built-in bias network (R2 = 10 kΩ) as shown in the equivalent circuit; the datasheet gives no separate emitter voltage limit. |
| 3 | COLLECTOR | passive | Collector output of the transistor; the datasheet limits the output current to 500 mA and the supply voltage (VCC) to 50 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage (on) | VI(on) | 2 | V | VO=0.3V, IO=20mA | 1 | ||
| Input voltage (off) | VI(off) | 0.3 | V | VCC=5V, IO=100µA | 1 | ||
| Output voltage (on) | VO(on) | 0.1 | 0.3 | V | IO/II=50mA/2.5mA | 1 | |
| Input current | II | 3.6 | mA | VI=5V | 1 | ||
| Output current (off) | IO(off) | 0.5 | µA | VCC=50V, VI=0V | 1 | ||
| DC current gain | GI | 56 | − | VO=5V, IO=50mA | 1 | ||
| Input resistance | R1 | 1.54 | 2.2 | 2.86 | kΩ | 1 | |
| Resistance ratio | R2/R1 | 3.6 | 4.5 | 5.5 | − | 1 | |
| Transition frequency | fT | 200 | MHz | VCE=10V, IE=−50mA, f=100MHz | 1 | ||
| Supply voltage | VCC | 50 | V | Ta=25°C | 1 | ||
| Input voltage | VIN | -5 | 12 | V | Ta=25°C | 1 | |
| Output current | IC | 500 | mA | Ta=25°C | 1 | ||
| Power dissipation | Pd | 200 | mW | Ta=25°C | 1 | ||
| Junction temperature | Tj | 150 | °C | Ta=25°C | 1 | ||
| Storage temperature | Tstg | -55 | 150 | °C | Ta=25°C | 1 |
CAD (KiCad official)
- Symbol:
LDTD123YLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
ldtd123ylt1g-etched.step/ldtd123ylt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ldtd123ylt1g.step/ldtd123ylt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LRC datasheet (3 pp, sha256
16e7b44ea5680f45, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# LDTD123YLT1G
**LRC** · Digital Transistors · SOT-23
LDTD123YLT1G from LRC, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BASE | input | Base input of the NPN bias-resistor transistor; the built-in input resistor R1 is 2.2 kΩ and the input voltage range is −5 V to +12 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor, with the built-in bias network (R2 = 10 kΩ) as shown in the equivalent circuit; the datasheet gives no separate emitter voltage limit. |
| 3 | COLLECTOR | passive | Collector output of the transistor; the datasheet limits the output current to 500 mA and the supply voltage (VCC) to 50 V. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage (on) | VI(on) | 2 | | | V | VO=0.3V, IO=20mA | 1 |
| Input voltage (off) | VI(off) | | | 0.3 | V | VCC=5V, IO=100µA | 1 |
| Output voltage (on) | VO(on) | | 0.1 | 0.3 | V | IO/II=50mA/2.5mA | 1 |
| Input current | II | | | 3.6 | mA | VI=5V | 1 |
| Output current (off) | IO(off) | | | 0.5 | µA | VCC=50V, VI=0V | 1 |
| DC current gain | GI | 56 | | | − | VO=5V, IO=50mA | 1 |
| Input resistance | R1 | 1.54 | 2.2 | 2.86 | kΩ | | 1 |
| Resistance ratio | R2/R1 | 3.6 | 4.5 | 5.5 | − | | 1 |
| Transition frequency | fT | | 200 | | MHz | VCE=10V, IE=−50mA, f=100MHz | 1 |
| Supply voltage | VCC | | | 50 | V | Ta=25°C | 1 |
| Input voltage | VIN | -5 | | 12 | V | Ta=25°C | 1 |
| Output current | IC | | | 500 | mA | Ta=25°C | 1 |
| Power dissipation | Pd | | | 200 | mW | Ta=25°C | 1 |
| Junction temperature | Tj | | | 150 | °C | Ta=25°C | 1 |
| Storage temperature | Tstg | -55 | | 150 | °C | Ta=25°C | 1 |
## CAD (KiCad official)
- Symbol: `LDTD123YLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ldtd123ylt1g-etched.step` / `ldtd123ylt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ldtd123ylt1g.step` / `ldtd123ylt1g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884474239602688) (3 pp, sha256 `16e7b44ea5680f45`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/ldtd123ylt1g-datasheet.pdf)