# RN1902

**TOSHIBA(东芝)** · IC · SOT363

RN1902 from TOSHIBA(东芝), in a SOT363. 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 | Emitter1 | passive | Emitter of transistor Q1 (NPN with built-in 10 kΩ base resistor R1 and 10 kΩ base-emitter resistor R2). |
| 2 | Base1 | input | Base (input) of transistor Q1 through built-in R1 = 10 kΩ, with R1/R2 ratio of 1.0. |
| 3 | Collector2 | passive | Collector of transistor Q2; VCEO rated 50 V and IC max 100 mA. |
| 4 | Emitter2 | passive | Emitter of transistor Q2 (NPN with built-in 10 kΩ base resistor R1 and 10 kΩ base-emitter resistor R2). |
| 5 | Base2 | input | Base (input) of transistor Q2 through built-in R1 = 10 kΩ, with R1/R2 ratio of 1.0. |
| 6 | Collector1 | passive | Collector of transistor Q1; VCEO rated 50 V and IC max 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TOSHIBA(东芝) |
| Package | SOT363 |
| Category |  |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Bias resistor R1 (input resistance) | R1 | 7 | 10 | 13 | kΩ |  | 4 |
| Resistor ratio R1/R2 (RN1901~RN1904 group) | R1/R2 | 0.9 | 1 | 1.1 |  |  | 4 |
| DC current gain | hFE | 50 |  |  |  | VCE = 5 V, IC = 10 mA | 4 |
| Collector cut-off current | ICBO |  |  | 100 | nA | VCB = 50 V, IE = 0 mA | 4 |
| Collector cut-off current | ICEO |  |  | 500 | nA | VCE = 50 V, IB = 0 mA | 4 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.3 | V | IC = 5 mA, IB = 0.25 mA | 4 |
| Collector-base voltage | VCBO |  |  | 50 | V | Ta = 25 °C, Q1/Q2 common | 3 |
| Collector-emitter voltage | VCEO |  |  | 50 | V | Ta = 25 °C, RN1901~RN1904 | 3 |
| Emitter-base voltage | VEBO |  |  | 10 | V | Ta = 25 °C, RN1901~RN1904 | 3 |
| Collector current | IC |  |  | 100 | mA | Ta = 25 °C | 3 |
| Collector power dissipation | PC |  |  | 200 | mW | Total rating, Ta = 25 °C | 3 |
| Junction temperature | Tj |  |  | 150 | °C |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `RN1902`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT363 (KiCad packages3D, STEP)
- 3D model files: `rn1902-etched.step` / `rn1902-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rn1902.step` / `rn1902.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOSHIBA(东芝) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602986424404885504) (11 pp, sha256 `9c180bf7af9d8072`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/rn1902-datasheet.pdf)