# TLP521GB

**UMW** · Transistor, Photovoltaic Output Optoisolators · DIP-4

TLP521GB from UMW, 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 | LED anode of the gallium arsenide infrared emitting diode; the LED reverse voltage is rated at 5 V and forward current at 50 mA on the absolute maximum table, with 1 A allowed for 100 µs pulses at 100 pps. |
| 2 | Cathode | passive | LED cathode of the gallium arsenide infrared emitting diode; the LED reverse voltage is rated at 5 V on the absolute maximum table. |
| 3 | Emitter | passive | Phototransistor emitter; the emitter-collector voltage is rated at 7 V and the collector-emitter voltage at 55 V on the absolute maximum table. |
| 4 | Collector | passive | Phototransistor collector; the collector-emitter voltage is rated at 55 V (min) and the collector current at 50 mA on the absolute maximum table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 5 |  | 24 | V |  | 3 |
| Forward Current | IF |  | 16 | 25 | mA |  | 3 |
| Collector Current | IC | 1 |  | 10 | mA |  | 3 |
| Operating Temperature | TOPR | -25 |  | 85 | °C |  | 3 |
| Pulse Forward Current | IFP |  |  | 1 | A | 100μs pulse, 100 pps | 2 |
| Reverse Voltage | VR |  |  | 5 | V |  | 2 |
| Junction Temperature (LED) | TJ |  |  | 125 | °C |  | 2 |
| Collector-Emitter Voltage | VCEO |  |  | 55 | V |  | 2 |
| Emitter-Collector Voltage | VECO |  |  | 7 | V |  | 2 |
| Collector Current | IC |  |  | 50 | mA |  | 2 |
| Junction Temperature (detector) | TJ |  |  | 125 | °C |  | 2 |
| Storage Temperature Range | TSTG | -55 |  | 125 | °C |  | 2 |
| Operating Temperature Range | TOPR | -55 |  | 100 | °C |  | 2 |
| Lead Soldering Temperature | TSOL |  |  | 260 | °C | 10 s | 2 |
| Isolation Voltage | BVS |  |  | 2500 | Vrms | AC, 1 min., R.H.≤60% (Note 1) | 2 |
| Forward Voltage | VF |  | 1.15 | 1.3 | V | IF=10mA | 4 |
| Reverse Current | IR |  |  | 10 | µA | VR=5V | 4 |
| Capacitance (LED) | CT |  | 30 |  | pF | V=0, f=1kHZ | 4 |
| Collector-Emitter Breakdown Voltage | V(BR)CEO | 55 |  |  | V | IC=0.5mA | 4 |
| Emitter-Collector Breakdown Voltage | V(BR)ECO | 6 |  |  | V | IE=0.1mA | 4 |
| Capacitance (Collector to Emitter) | CCE |  | 2 |  | pF | V=0, f=1MHz | 4 |
| Current Transfer Ratio | IC/IF | 50 |  | 600 | % | IF=5mA, VCE=5V | 4 |
| Current Transfer Ratio (Rank GB) | IC/IF | 100 |  | 600 | % | IF=5mA, VCE=5V, Rank GB | 4 |
| Saturated Current Transfer Ratio | IC/IF(SAT) | 30 |  |  | % | IF=1mA, VCE=0.4V | 4 |
| Saturated Current Transfer Ratio (Rank GB) | IC/IF(SAT) | 60 |  |  | % | IF=1mA, VCE=0.4V, Rank GB | 4 |
| Collector-Emitter Saturation Voltage | VCE (sat) |  |  | 0.4 | V | IC=2.4mA, IF=8mA | 4 |
| Isolation Voltage (AC, 1 minute) | BVS | 2500 |  |  | Vrms | AC, 1 minute | 5 |
| Isolation Voltage (AC, 1 second, in oil) | BVS | 5000 |  |  | Vrms | AC, 1 second, in oil | 5 |
| Isolation Voltage (DC, 1 minute, in oil) | BVS | 5000 |  |  | Vdc | DC, 1 minute, in oil | 5 |
| Isolation Resistance | RS | 1011 |  |  | Ω | VS=500V, R.H.≤ 60% | 5 |
| Capacitor (Input To Output) | CS |  | 0.8 |  | pF | VS=0, f =1MHz | 5 |

## CAD (KiCad official)

- Symbol: `TLP521GB`
- Footprint: `Package_DIP:DIP-4_W7.62mm`
- 3D model: DIP-4 (KiCad packages3D, STEP)
- 3D model files: `tlp521gb-etched.step` / `tlp521gb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlp521gb.step` / `tlp521gb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757271442301952000) (12 pp, sha256 `eeb1e8e82b6682e1`, retrieved 2026-10-19, 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/tlp521gb-datasheet.pdf)