# AT3H7A-CuH-S

**AOTE** · Transistor Output Optocoupler · SSOP-4

AT3H7A-CuH-S from AOTE, in a SSOP-4. 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 | input | LED anode of the input emitter, with recommended forward current IF of 5 to 15 mA and an absolute maximum of 50 mA. |
| 2 | Cathode | passive | LED cathode of the input emitter, with reverse voltage specified at VR=4V for a maximum IR of 10 µA. |
| 3 | Emitter | passive | Phototransistor emitter, with emitter-collector voltage VECO rated at 7 V maximum. |
| 4 | Collector | passive | Phototransistor collector, with collector-emitter voltage VCEO rated at 80 V maximum and collector current IC at 50 mA maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | AOTE |
| Package | SSOP-4 |
| Category | Optocouplers/Photocouplers |
| Pins | 4 |

## 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 |  |  | 50 | mA | Ta=25°C | 3 |
| Power Dissipation | PD |  |  | 70 | mW | Ta=25°C | 3 |
| Collector Power Dissipation | PC |  |  | 150 | mW | Ta=25°C | 3 |
| Collector Current | IC |  |  | 50 | mA | Ta=25°C | 3 |
| Collector-Emitter Voltage | VCEO |  |  | 80 | V | Ta=25°C | 3 |
| Emitter-Collector Voltage | VECO |  |  | 7 | V | Ta=25°C | 3 |
| Isolation Voltage | Viso |  |  | 3750 | Vrms | Ta=25°C | 3 |
| Operating Temperature | Topr | -55 |  | 110 | ℃ |  | 3 |
| Storage Temperature | Tstg | -55 |  | 125 | ℃ |  | 3 |
| Soldering Temperature | Tsol |  |  | 260 | ℃ |  | 3 |
| Power dissipation derating factor (above Ta = 90°C) | PDD |  | 2.9 |  | mW/°C | above Ta = 90°C | 3 |
| Forward Current (recommended) | IF | 5 |  | 15 | mA |  | 3 |
| Collector-Emitter Voltage (recommended) | VCEO | 5 |  | 80 | V |  | 3 |
| Collector Current (recommended) | IC | 5 |  | 35 | mA |  | 3 |
| Current Transfer Ratio (grade A) | CTR | 80 |  | 160 | % | IF=1mA, VCE=5V | 4 |
| Forward Voltage | VF |  | 1.2 | 1.4 | V | IF=20mA | 4 |
| Reverse Current | IR |  |  | 10 | µA | VR=4V | 4 |
| Terminal Capacitance | Ct |  | 30 | 250 | pF | V=0V, F=1KHz | 4 |
| Collector Dark Current | ICEO |  |  | 100 | nA | VCE=20V, IF=0mA | 4 |
| Collector-Emitter Breakdown Voltage | BVCEO | 80 |  |  | V | IC=0.1mA, IF=0mA | 4 |
| Emitter-Collector Voltage | BVECO | 7 |  |  | V | IE=10uA, IF=0mA | 4 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  | 0.1 | 0.2 | V | IF=±20mA, IC=1mA | 4 |
| Isolation capacitance | CISO |  | 0.6 | 1 | pF | V=0,f=1MHz | 4 |
| Rise Time | Tr |  |  | 18 | µs | VCE=2V, IC=2mA, RL=100Ω | 4 |
| Fall Time | Tf |  |  | 18 | µs | VCE=2V, IC=2mA, RL=100Ω | 4 |
| Cut-off Frequency | Fc |  | 80 |  | kHz | VCE=5V, IC=2mA, RL=100Ω, -3dB | 4 |

## 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 |  | ④ 框架类型 Lead Frame ( Cu: 铜框架 Copper) | 8 |

## CAD (KiCad official)

- Symbol: `AT3H7A-CuH-S`
- Footprint: `Package_SO:SSOP-4_4.4x2.6mm_P1.27mm`
- 3D model: SSOP-4, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.75 mm nominal SSOP height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `at3h7a-cuh-s-etched.step` / `at3h7a-cuh-s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at3h7a-cuh-s.step` / `at3h7a-cuh-s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [AOTE datasheet](docs/at3h7a-cuh-s-datasheet.pdf) (12 pp, sha256 `fb77ec30ede4c1ff`, retrieved 2026-11-04, 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-sonnet-5-5` (text+vision), consensus `claude-opus-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/at3h7a-cuh-s-datasheet.pdf)