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TLP521-4GB

Quad phototransistor optocoupler, 55V, CTR 100%, 2500Vrms, 16-DIP

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Manufacturer Part：

TLP521-4GB

Package：

16-DIP (9.82 x 7.62 x 4.2 mm)

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Description

Product Overview

The TLP521-4GB from Toshiba is a quad-channel phototransistor optocoupler in a 16-pin DIP package. With 55V VCEO, 100% minimum CTR (GB rank), and 2500Vrms isolation voltage, it provides reliable signal isolation for industrial control.

Key Specifications

Channels 4
CTR (GB Rank) 100% min
VCEO 55V
Isolation Voltage 2500Vrms
LED Forward Current 50mA max
Collector Current 50mA max
Package 16-DIP
Operating Temperature -55°C to +100°C

Features

  • 4 isolated channels in single 16-DIP package
  • GB rank: 100% minimum CTR
  • 2500Vrms isolation voltage (UL1577 recognized)
  • 55V collector-emitter breakdown voltage
  • Industry-standard DIP-16 pinout
  • UL and cUL recognized

Applications

  • Programmable logic controller I/O isolation
  • AC/DC input module signal conditioning
  • Solid-state relay drive circuits
  • Power supply feedback loop isolation
  • Communication interface isolation

The TLP521-4GB from Toshiba is a quad-channel phototransistor optocoupler combining four gallium arsenide infrared LEDs with silicon phototransistors in a 16-pin DIP package. The GB rank guarantees a minimum CTR of 100%, ensuring reliable signal coupling at low LED drive currents. The 2500Vrms isolation voltage provides robust galvanic isolation meeting UL1577 safety requirements. With 55V VCEO and 50mA collector current per channel, it is suited for industrial control and PLC I/O isolation where multiple isolated channels are needed.

Each channel consists of a GaAs infrared LED optically coupled to a silicon NPN phototransistor. When current flows through the LED, it emits infrared light detected by the phototransistor base, generating base current amplified by the transistor hFE. The output collector current is proportional to LED input current, with the ratio defined as CTR. The GB rank guarantees CTR >= 100% at IF = 5mA. The optical coupling provides electrical isolation with no direct electrical connection.

Pin Name Type Function
1 AN1 Input Channel 1 LED anode
2 CA1 Input Channel 1 LED cathode
3 CA2 Input Channel 2 LED cathode
4 AN2 Input Channel 2 LED anode
5 AN3 Input Channel 3 LED anode
6 CA3 Input Channel 3 LED cathode
7 CA4 Input Channel 4 LED cathode
8 AN4 Input Channel 4 LED anode
9 E4 Output Channel 4 emitter
10 C4 Output Channel 4 collector
11 C3 Output Channel 3 collector
12 E3 Output Channel 3 emitter
13 E2 Output Channel 2 emitter
14 C2 Output Channel 2 collector
15 C1 Output Channel 1 collector
16 E1 Output Channel 1 emitter
  • PLC digital input/output channel isolation
  • AC/DC input module signal conditioning
  • Solid-state relay gate drive isolation
  • Switching power supply feedback loop
  • Communication line interface isolation
Manufacturer Part Number Package Notes
Vishay SFH6741-4 16-DIP Quad optocoupler, 100% CTR
Everlight EL817-4GB 16-DIP Quad, 100% CTR, compatible
Toshiba TLP521-2GB 8-DIP Dual channel version
Renesas PS2801-4 16-DIP Quad, 80% CTR min
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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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