# 2SA1611

**Changjing** · Bipolar (BJT) · SOT-323

2SA1611 from Changjing, in a SOT-323. 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 | passive | Base terminal of the PNP transistor; the datasheet gives no pin-specific limit, and the device's emitter-base voltage is rated VEBO = -5 V with IE = -100 µA for V(BR)EBO. |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor; the datasheet gives no pin-specific limit, and the device's collector current is rated IC = -100 mA maximum. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; the datasheet gives no pin-specific limit, and the device's collector-emitter voltage is rated VCEO = -50 V with collector power dissipation PC = 150 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| DC current gain | hFE | 90 |  | 600 |  | VCE=-6V, IC=-1mA; pulse width ≤350μs, duty cycle ≤2.0% | 1 |
| Collector-base breakdown voltage | V(BR)CBO | -60 |  |  | V | IC=-100µA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -50 |  |  | V | IC=-1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-100µA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -100 | nA | VCB=-60V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -100 | nA | VEB=-5V, IC=0 | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.3 | V | IC=-100mA, IB=-10mA | 1 |
| Base-emitter voltage | VBE | -0.58 |  | -0.68 | V | VCE=-6V, IC=-1mA | 1 |
| Transition frequency | fT | 180 |  |  | MHz | VCE=-6V, Ic=-10mA | 1 |
| Collector output capacitance | Cob |  |  | 4.5 | pF | VCB=-10V, IE=0, f=1MHz | 1 |
| Collector-base voltage | VCBO | -60 |  |  | V |  | 1 |
| Collector-emitter voltage | VCEO | -50 |  |  | V |  | 1 |
| Emitter-base voltage | VEBO | -5 |  |  | V |  | 1 |
| Collector current | IC | -100 |  |  | mA |  | 1 |
| Collector power dissipation | PC |  |  | 150 | mW |  | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance, junction to ambient | RΘJA |  |  | 833 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2SA1611`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `2sa1611-etched.step` / `2sa1611-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sa1611.step` / `2sa1611.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/2sa1611-datasheet.pdf) (4 pp, sha256 `f79c03ccef310833`, 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/2sa1611-datasheet.pdf)