This document describes the features and characteristics of high density mounting phototransistor optically coupled isolators produced by ISOCOM COMPONENTS LTD. These features include UL recognition, high current transfer ratio, high isolation voltage, and high BVCEO. The product is suitable for computer terminals, industrial system controllers, measuring instruments, and signal transmission between systems of different potentials and impedances.
The TLP521 series optically coupled isolators from ISOCOM combine infrared LEDs and NPN silicon phototransistors in compact dual‑in‑line packages. They are UL recognised (File No. E91231) and offered with various options such as 10 mm lead spread, surface‑mount, and tape‑and‑reel packaging.
The document provides detailed electrical characteristics, absolute maximum ratings, mechanical dimensions, and performance graphs, covering parameters like isolation voltage, collector‑emitter breakdown, forward voltage, CTR, and temperature derating.
| Collector‑Emitter Voltage (BV) | 55 V |
|---|---|
| Input Forward Voltage (typical) | 1.0‑1.3 V @ 10 mA |
| Reverse Voltage | 5 V |
| Total Power Dissipation | 200 mW |
| Operating Temperature Range | -55 °C to +100 °C |
| Storage Temperature Range | -55 °C to +125 °C |
The collector‑emitter breakdown voltage is rated at 55 V.
It operates from –55 °C up to +100 °C.
The input forward voltage is typically between 1.0 V and 1.3 V at 10 mA.