# AT4N31-CuH-D

**AOTE** · Transistor, Photovoltaic Output Optoisolators · DIP-6

AT4N31-CuH-D from AOTE, in a DIP-6. 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 | Anode | passive | LED anode of the GaAs input diode; the datasheet rates forward current IF at 60 mA, peak forward current IFP at 1 A (1 µs pulse), and reverse voltage VR at 3 V. |
| 2 | Cathode | passive | LED cathode of the GaAs input diode, with the input reverse voltage limit VR of 3 V stated in the ratings. |
| 3 | NC | unconnected | No connection; the datasheet lists this pin as NC and gives no function or limit for it. |
| 4 | Emitter | passive | Emitter of the output Darlington transistor, with emitter-collector voltage VECO rated at 5 V and emitter-base voltage VEBO rated at 8 V. |
| 5 | Collector | passive | Collector of the output Darlington transistor, rated for collector-emitter voltage VCEO of 30 V, collector current IC of 100 mA, and collector power dissipation PC of 150 mW. |
| 6 | Base | passive | Base of the output Darlington transistor; the datasheet gives no separate pin-level limit, only the collector-base voltage VCBO of 50 V and emitter-base voltage VEBO of 8 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | AOTE |
| Package | DIP-6 |
| Category | Optoisolators |
| 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 |
|---|---|---|---|---|---|---|---|
| Forward Current | IF |  |  | 60 | mA |  | 4 |
| Peak Forward Current | IFP |  |  | 1 | A | 1us, pulse | 4 |
| Reverse Voltage | VR |  |  | 3 | V |  | 4 |
| Power Dissipation | PD |  |  | 100 | mW |  | 4 |
| Collector Power Dissipation | PC |  |  | 150 | mW |  | 4 |
| Collector Current | IC |  |  | 100 | mA |  | 4 |
| Collector-Base Voltage | VCBO |  |  | 50 | V |  | 4 |
| Emitter-Base Voltage | VEBO |  |  | 8 | V |  | 4 |
| Collector-Emitter Voltage | VCEO |  |  | 30 | V |  | 4 |
| Emitter-Collector Voltage | VECO |  |  | 5 | V |  | 4 |
| Total Power Dissipation | Ptot |  |  | 250 | mW |  | 4 |
| Input-Output Isolation Voltage | Viso |  |  | 5000 | Vrms |  | 4 |
| Operating Temperature | Topr | -55 |  | 100 | ℃ |  | 5 |
| Storage Temperature | Tstg | -55 |  | 125 | ℃ |  | 5 |
| Soldering Temperature | Tsol |  |  | 260 | ℃ |  | 5 |
| Forward Voltage | VF |  | 1.3 | 1.5 | V | IF=10mA | 5 |
| Reverse Current | IR |  |  | 10 | µA | VR=3V | 5 |
| Collector Dark Current | ICEO |  |  | 100 | nA | VCE=10V | 5 |
| Collector-Base Breakdown Voltage | BVCBO | 50 |  |  | V | IB=0.1mA, IF=0 | 5 |
| Collector-Emitter Breakdown Voltage | BVCEO | 40 |  |  | V | IC=0.1mA, IF=0 | 5 |
| Emitter-Collector Breakdown Voltage | BVECO | 7 |  |  | V | IE=0.1mA, IF=0 | 5 |
| Current Transfer Ratio (4N31) | CTR | 50 |  |  | % | IF=10mA, VCE=10V | 5 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  |  | 1 | V | IF=8mA, IC=2mA | 5 |
| Turn-on Time | Ton |  |  | 5 | µs | VCE=10V, IC=50mA, RL=100Ω | 5 |
| Turn-off Time | Toff |  |  | 100 | µs |  | 5 |
| Preheat Temperature | Ts | 150 |  | 200 | ℃ | Reflow profile | 9 |
| Preheat Time | ts | 60 |  | 120 | s | Reflow profile | 9 |
| Ramp-Up Rate (TL to TP) |  |  |  | 3 | ℃/s | TL to TP, reflow profile | 9 |
| Time Above TL | L | 60 |  | 150 | s | Reflow profile | 9 |
| Peak Temperature | TP |  |  | 260 | ℃ | Reflow profile | 9 |
| Time Within (TP-5) to TP | tp |  |  | 30 | s | Time during which Tc is between (TP-5) and TP | 9 |
| Ramp-Down Rate (TP to TL) |  |  |  | 6 | ℃/s | TP to TL, reflow profile | 9 |
| Manual Soldering Temperature Tolerance |  | -5 | 360 | 5 | ℃ | Manual soldering, nominal 360℃ ± 5℃ | 10 |
| Manual Soldering Time |  |  |  | 3 | s | Manual soldering, 360℃ ± 5℃ | 10 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper |  | ③ 框架类型 Lead Frame（Cu: 铜框架 Copper） | 3 |

## CAD (KiCad official)

- Symbol: `AT4N31-CuH-D`
- Footprint: `Package_DIP:DIP-6_W7.62mm`
- 3D model: DIP-6 (KiCad packages3D, STEP)
- 3D model files: `at4n31-cuh-d-etched.step` / `at4n31-cuh-d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at4n31-cuh-d.step` / `at4n31-cuh-d.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [AOTE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603345197439078400) (12 pp, sha256 `f6d9288e028d86f9`, retrieved 2026-10-16, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/at4n31-cuh-d-datasheet.pdf)