# K30101A

**Cosmo Electronics** · Transistor, Photovoltaic Output Optoisolators · DIP-4

K30101A from Cosmo Electronics, in a DIP-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, Cathode | passive | One terminal of the two infrared emitting diodes connected in inverse parallel on the input side; the input forward current is rated ±50 mA (IF) with a peak of ±1 A (IFM). |
| 2 | Anode, Cathode | passive | The other terminal of the inverse-parallel infrared emitting diode pair on the input side; the input forward current is rated ±50 mA (IF) with a peak of ±1 A (IFM). |
| 3 | Emitter | passive | Emitter of the phototransistor output detector; the emitter-collector voltage is rated at 6 V (VECO) maximum. |
| 4 | Collector | passive | Collector of the phototransistor output detector; the collector-emitter voltage is rated at 80 V (VCEO) and the collector current at 50 mA (IC) maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Cosmo Electronics |
| Package | DIP-4 |
| Category | Optoisolators |
| 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 voltage | VF |  | 1.2 | 1.4 | V | IF=±20mA | 3 |
| Peak forward voltage | VFM |  |  | 3 | V | IFM=±0.5A | 3 |
| Collector dark current | ICEO |  |  | 0.1 | μA | VCE=20V | 3 |
| Current transfer ratio, rank A | CTR | 60 |  | 600 | % | IF=±1mA, VCE=5V | 4 |
| Collector-emitter saturation voltage | VCE(sat) |  | 0.1 | 0.3 | V | IF=±20mA, IC=1mA | 3 |
| Floating capacitance | Cf |  | 0.6 | 1 | pF | V=0, f=1MHz | 3 |
| Response time (rise) | tr |  | 5 | 20 | μs | VCE=2V, IC=2mA, RL=100Ω | 3 |
| Response time (fall) | tf |  | 4 | 20 | μs | VCE=2V, IC=2mA, RL=100Ω | 3 |
| Forward current | IF | -50 |  | 50 | mA |  | 3 |
| Peak forward current | IFM | -1 |  | 1 | A |  | 3 |
| Power dissipation (input) | PD |  |  | 70 | mW |  | 3 |
| Collector-emitter voltage | VCEO |  |  | 80 | V |  | 3 |
| Emitter-collector voltage | VECO |  |  | 6 | V |  | 3 |
| Collector current | IC |  |  | 50 | mA |  | 3 |
| Collector power dissipation | PC |  |  | 150 | mW |  | 3 |
| Total power dissipation | Ptot |  |  | 200 | mW |  | 3 |
| Isolation voltage | Viso |  |  | 5000 | Vrms | 1 minute | 3 |
| Operating temperature | Topr | -55 |  | 115 | ℃ |  | 3 |
| Storage temperature | Tstg | -55 |  | 125 | ℃ |  | 3 |
| Soldering temperature | Tsol |  |  | 260 | ℃ | 10 seconds | 3 |

## CAD (KiCad official)

- Symbol: `K30101A`
- Footprint: `Package_DIP:DIP-4_W7.62mm`
- 3D model: DIP-4 (KiCad packages3D, STEP)
- 3D model files: `k30101a-etched.step` / `k30101a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `k30101a.step` / `k30101a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Cosmo Electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588896906760097792) (11 pp, sha256 `85bddbcc12b34fac`, retrieved 2026-10-16, 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/k30101a-datasheet.pdf)