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TLP785(D4-GRL,F

Transistor output optocoupler, 5000Vrms isolation, CTR 100-200% (GRL rank), VDE approved DIP-4

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Manufacturer Part：

TLP785(D4-GRL,F

Package：

DIP-4 (4.6 x 7.62 x 3.5 mm, 7.62mm pitch)

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Description

Product Overview

The TLP785(D4-GRL,F from Toshiba is a transistor-output optocoupler consisting of a GaAs infrared LED optically coupled to a silicon phototransistor in a 4-pin DIP package. It provides 5000 Vrms isolation voltage and a current transfer ratio (CTR) of 100-200% (GRL rank). The D4 option includes VDE approval per EN 60747-5-2 for reinforced insulation applications.

Key Specifications

Isolation Voltage 5000 Vrms (min)
CTR (GRL Rank) 100% to 200% @ IF=5mA
Collector-Emitter Voltage 80 V
Forward Voltage (typ) 1.15 V @ IF=10mA
VCE(sat) (max) 0.4 V
Collector Current 50 mA (max)
Rise/Fall Time 2 µs / 3 µs (typ)
Turn On/Off Time 3 µs / 3 µs (typ)
Operating Temperature -55°C to +110°C
Package 4-DIP (7.62mm pitch)

Features

  • High isolation voltage: 5000 Vrms minimum
  • VDE approved (D4 option): EN 60747-5-2
  • UL recognized: UL 1577
  • Wide CTR range selection (multiple ranks)
  • Compact DIP-4 package
  • High reliability GaAs IRED

Applications

  • Switching power supply feedback isolation
  • Industrial control signal isolation
  • Programmable logic controller (PLC) interfaces
  • AC mains voltage detection
  • Communication interface isolation

The TLP785(D4-GRL,F is a high-isolation optocoupler from Toshiba that pairs a gallium arsenide (GaAs) infrared emitting diode with a silicon NPN phototransistor in a compact 4-pin DIP package. The D4 option provides VDE approval per EN 60747-5-2 for reinforced insulation, making it suitable for safety-critical applications. The GRL rank specifies a current transfer ratio of 100-200% at 5 mA forward current, providing a well-defined gain for circuit design. With 5000 Vrms isolation and approvals from UL, VDE, and cUL, this device is ideal for signal isolation in power supplies and industrial equipment.

The TLP785 operates by converting an electrical input signal to infrared light via the GaAs LED, then back to an electrical signal via the silicon phototransistor, with optical coupling providing galvanic isolation between input and output. When forward current flows through the LED, it emits infrared radiation that is detected by the phototransistor base region, generating base current that drives collector current proportional to the LED current. The ratio of output collector current to input LED current is the current transfer ratio (CTR). The GRL rank guarantees 100-200% CTR at 5 mA. The 5000 Vrms isolation barrier is maintained by the internal optical path and package insulation, with minimum creepage of 7.0 mm and clearance of 7.0 mm.

Pin Name Type Function
1 Anode Input LED anode
2 Cathode Input LED cathode
3 Emitter Output Phototransistor emitter
4 Collector Output Phototransistor collector
  • Switching power supply error feedback loops
  • Isolated communication interfaces (RS-485, CAN)
  • Industrial PLC digital I/O isolation
  • AC zero-crossing detection circuits
  • Medical equipment patient isolation barriers
Manufacturer Part Number Package Notes
Toshiba TLP785(D4-GB,F DIP-4 GB rank CTR 100-600%
Vishay SFH610A-3 DIP-4 CTR 100-200%, pin-compatible
Everlight EL817C DIP-4 CTR 200-400%, lower cost
Sharp PC817C DIP-4 CTR 200-400%, widely available
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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