# PZTA44

**Changjing** · Bipolar (BJT) · SOT-223

PZTA44 from Changjing, in a SOT-223. 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 | NPN transistor base terminal; the datasheet gives no pin-specific limit, so the absolute maximum ratings apply (VEBO 6 V, IC 200 mA continuous, 300 mA pulsed). |
| 2 | COLLECTOR | passive | NPN transistor collector terminal; the datasheet gives no pin-specific limit, so the absolute maximum ratings apply (VCBO 400 V, VCEO 400 V, PC 1 W). |
| 3 | EMITTER | passive | NPN transistor emitter terminal; the datasheet gives no pin-specific limit, so the absolute maximum ratings apply (VEBO 6 V, TJ/Tstg -55 to 150 ℃). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-223 |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base voltage | VCBO |  |  | 400 | V |  | 1 |
| Collector-emitter voltage | VCEO |  |  | 400 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | 6 | V |  | 1 |
| Collector current -Continuous | IC |  |  | 200 | mA |  | 1 |
| Collector current -Pulsed | ICM |  |  | 300 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 1 | W |  | 1 |
| Junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 400 |  |  | V | IC=100μA,IE=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | μA | VCB=400V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | μA | VEB=4V,IC=0 | 1 |
| DC current gain hFE(1) | hFE(1) | 40 |  |  |  | VCE=10V,IC=1mA | 1 |
| DC current gain hFE(2) | hFE(2) | 50 |  | 200 |  | VCE=10V,IC=10mA | 1 |
| DC current gain hFE(3) | hFE(3) | 45 |  |  |  | VCE=10V,IC=50mA | 1 |
| DC current gain hFE(4) | hFE(4) | 40 |  |  |  | VCE=10V,IC=100mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.4 | V | IC=1mA,IB=0.1mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=10mA,IB=1mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.75 | V | IC=50mA,IB=5mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 0.75 | V | IC=10mA,IB=1mA | 1 |
| Transition frequency | fT | 20 |  |  | MHz | VCE=10V,IC=10mA,f=100MHz | 1 |
| Collector capacitance | CC |  |  | 7 | pF | VCB=20V,IE=0,f=1MHz | 1 |
| Emitter capacitance | Ce |  |  | 130 | pF | VEB=0.5V,IC=0,f=1MHz | 1 |

## CAD (KiCad official)

- Symbol: `PZTA44`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `pzta44-etched.step` / `pzta44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pzta44.step` / `pzta44.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590237190292086784) (4 pp, sha256 `b2ab023211defee4`, retrieved 2026-10-18, 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/pzta44-datasheet.pdf)