# C1815 120~240-TA

**Changjiang Electronics Tech (CJ)** · Bipolar Transistors - BJT · TO-92

C1815 120~240-TA from Changjiang Electronics Tech (CJ), in a TO-92. 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 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet gives a maximum emitter-base voltage VEBO of 5 V. |
| 2 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet gives a maximum collector-emitter voltage VCEO of 50 V and continuous collector current IC of 150 mA. |
| 3 | BASE | input | Base terminal of the NPN transistor that controls the device; the datasheet gives a maximum collector-base voltage VCBO of 60 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjiang Electronics Tech (CJ) |
| Package | TO-92 |
| Category | Transistors |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 60 |  |  | V | IC= 100uA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 50 |  |  | V | IC= 0.1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE= 100uA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | uA | VCB= 60V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | uA | VEB=5V, IC=0 | 1 |
| DC current gain (rank Y, 120-240) | hFE | 120 |  | 240 |  | VCE= 6 V, IC= 2mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.25 | V | IC=100mA, IB=10mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1 | V | IC=100mA, IB=10mA | 1 |
| Transition frequency | fT | 80 |  |  | MHz | VCE=10 V, IC= 1mA, f=30MHz | 1 |
| Collector output capacitance | Cob |  |  | 3.5 | pF | VCB=10V, IE=0, f=1MHz | 1 |
| Noise figure | NF |  |  | 10 | dB | VCE=6V, IC=0.1mA, f=1KHz, RG=10K | 1 |
| Collector-base voltage | VCBO |  |  | 60 | V |  | 1 |
| Collector-emitter voltage | VCEO |  |  | 50 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | 5 | V |  | 1 |
| Collector current, continuous | IC |  |  | 150 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 400 | mW |  | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to ambient | RθJA |  | 312 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `C1815 120~240-TA`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `c1815-120-240-ta-etched.step` / `c1815-120-240-ta-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `c1815-120-240-ta.step` / `c1815-120-240-ta.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Changjiang Electronics Tech (CJ) datasheet](docs/c1815-120-240-ta-datasheet.pdf) (2 pp, sha256 `ee68fd79ceafdf7e`, retrieved 2026-10-30, 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/c1815-120-240-ta-datasheet.pdf)