# KP40101B

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

KP40101B 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 | passive | Input LED anode; absolute maximum ratings give forward current IF 50 mA and reverse voltage VR 6 V. |
| 2 | Cathode | passive | Input LED cathode, the return side of the input forward-current path rated at IF 50 mA maximum with VR 6 V reverse. |
| 3 | Emitter | passive | Output phototransistor emitter; the datasheet rates emitter-collector voltage VECO at 0.1 V. |
| 4 | Collector | passive | Output phototransistor collector; the datasheet rates collector-emitter voltage VCEO at 300 V and collector current IC at 150 mA. |

## 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 |
|---|---|---|---|---|---|---|---|
| Current transfer ratio | CTR | 600 |  | 9000 | % | IF =1mA,VCE=2V | 1 |
| Input forward voltage | VF |  | 1.2 | 1.4 | V | IF =20mA | 1 |
| Peak forward voltage | VFM |  |  | 3.5 | V | IFM =0.5A | 1 |
| Reverse current | IR |  |  | 10 | uA | VR =4V | 1 |
| Collector dark current | ICEO |  |  | 1 | uA | VCE =200V, IF=0 | 1 |
| Collector-emitter saturation voltage | VCE (sat) |  |  | 1.5 | V | IF=20mA, IC=5mA | 1 |
| Floating capacitance | Cf |  | 0.6 | 1 | pF | V=0, f=1MHZ | 1 |
| Response time (Rise) | tr |  | 60 | 300 | us | VCE=2V, IC=20mA, RL=100ohm | 1 |
| Response time (Fall) | tf |  | 50 | 250 | us |  | 1 |
| Input forward current | IF |  |  | 50 | mA |  | 1 |
| Peak forward current | IFM |  |  | 1 |  |  | 1 |
| Reverse voltage | VR |  |  | 6 | V |  | 1 |
| Input power dissipation | PD |  |  | 70 | mW |  | 1 |
| Collector-emitter voltage | VCEO |  |  | 300 | V |  | 1 |
| Emitter-collector voltage | VECO |  |  | 0.1 | V |  | 1 |
| Collector current | IC |  |  | 150 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 200 | mW |  | 1 |
| Total power dissipation | Ptot |  |  | 200 | mW |  | 1 |
| Isolation voltage | Viso |  |  | 5000 | Vrms | 1 minute | 1 |
| Operating temperature | Topr | -30 |  | 100 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Soldering temperature | Tsol |  |  | 260 | °C | 10 second | 1 |

## CAD (KiCad official)

- Symbol: `KP40101B`
- Footprint: `Package_DIP:DIP-4_W7.62mm`
- 3D model: DIP-4 (KiCad packages3D, STEP)
- 3D model files: `kp40101b-etched.step` / `kp40101b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kp40101b.step` / `kp40101b.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/8588900129839046656) (2 pp, sha256 `f228e39cc944c969`, retrieved 2026-10-15, 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/kp40101b-datasheet.pdf)