Toshiba Semiconductor and Storage TLP3547(F

Overview

TLP3547(F) from Toshiba Electronic Devices & Storage Corporation is a normally-open photorelay IC comprising an infrared LED optically coupled to a photo-MOSFET output stage. It delivers 5 A max ON-state current (A-connection), 50 mΩ max ON-resistance, and 60 V min OFF-state voltage in an 8-pin DIP through-hole package - enabling direct replacement of mechanical relays in industrial power switching applications such as PLC I/O modules and automatic test equipment.

For engineers reviewing the TLP3547(F) datasheet, TLP3547(F) pinout, TLP3547(F) application, or TLP3547(F) equivalent, this page provides verified technical context on isolation performance (2500 Vrms), switching timing (2.5 ms turn-on), safety certifications (UL 1577, UL 508, EN 60747-5-5 with Option D4), and design-critical derating behavior across temperature for reliable high-cycle solid-state switching.

Technical Context

The TLP3547(F) implements a single-pole, normally-open (1-Form-A) solid-state switch architecture using gallium arsenide (GaAs) LED excitation and dual-source/drain MOSFET output configuration. Its internal two-terminal detector structure (pins 5–8 shorted internally) supports A-, B-, and C-connection topologies for flexible load routing.

It operates with 5 mA max trigger LED current and sustains 5 A continuous ON-state current under derated conditions up to 85 °C ambient, with thermal derating slopes of −50 mA/°C for the output stage. Isolation integrity is maintained via ≥7.0 mm creepage/clearance (TLP3547) or ≥8.0 mm (TLP3547F), meeting reinforced insulation requirements per UL and VDE standards.

Key Specifications

Pinout & Package

Package: 8-pin DIP (dual in-line package), through-hole mounting; TLP3547 uses 7.62-mm lead pitch, TLP3547F uses 10.16-mm lead pitch. Both are RoHS-compliant and rated for 260 °C soldering (10 s).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar photorelay applications.

Compared with TLP3547(F), TLP3546(F) offers reduced current handling and isolation margin at lower cost, while PS8702-AX trades certification and power capability for surface-mount compatibility - making TLP3547(F) the optimal choice for certified, high-current, through-hole industrial switching.

Availability

TLP3547(F) is available at Aetrix Electronics and suitable for programmable logic controllers (PLCs), automatic test equipment (ATE), factory automation (FA) systems, and measuring instruments requiring stable component supply, long-lifecycle support, and certified isolation performance.

Supply support for TLP3547(F) includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for industrial, automotive, and infrastructure applications, with core expertise in power devices, logic ICs, and optoelectronics.

The TLP3547(F) belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of electromechanical relays in harsh industrial environments - emphasizing long life, low R_ON, and globally recognized safety certifications.

FAQ

What is the maximum continuous ON-state current rating for TLP3547(F) under industrial operating conditions?

The TLP3547(F) supports 5 A maximum ON-state current in A-connection configuration at 25 °C ambient. Derating applies above 60 °C: −50 mA/°C down to 3.3 A at 85 °C per UL 508 specifications. This rating is validated for continuous DC or resistive AC loads up to 48 V, with thermal management dependent on PCB copper area and airflow. TLP3547(F) must not exceed absolute maximum ratings - including 750 mW output power dissipation - even during transient pulses.

Does TLP3547(F) support multiple output connection topologies, and how do they differ electrically?

Yes, TLP3547(F) supports three distinct output configurations: A-connection (pins 5–6 and 7–8 paralleled for 5 A), B-connection (pins 5–6 only, 3.5 A max), and C-connection (pins 5–7 only, 2.5 A max). Each topology alters current sharing, R_ON, and thermal distribution - A-connection yields lowest resistance (50 mΩ max), while B- and C-connections increase R_ON to 25 mΩ and 13 mΩ respectively due to reduced parallel MOSFET channels. Selection depends on required current, layout constraints, and thermal budget.

What safety certifications apply to TLP3547(F), and which variants carry VDE approval?

TLP3547(F) is UL-recognized per UL 1577 (File E67349) and UL 508 (File E499232), and CSA-certified (5A File E67349). VDE approval to EN 60747-5-5 is available only with Option D4 designation - e.g., TLP3547(D4,TP1,F) - which modifies internal construction and marking to meet stricter partial discharge and insulation coordination requirements. Standard TLP3547(F) does not carry VDE approval; D4 variants require explicit part number selection and are subject to separate qualification testing.

How does the TLP3547(F) pinout accommodate PCB layout for high-isolation applications?

TLP3547(F) separates input (pins 1–4) and output (pins 5–8) into physically isolated quadrants, with ≥7.0 mm (TLP3547) or ≥8.0 mm (TLP3547F) minimum creepage and clearance distances. Pins 1 and 4 are N.C., allowing guard traces to be routed between input and output sections. The dual-source (6,7) and dual-drain (5,8) arrangement supports symmetrical current paths and minimizes loop inductance. Layout best practices include maintaining 8 mm minimum spacing across the isolation barrier and avoiding copper pours beneath the package body to preserve dielectric strength.

Can TLP3547(F) drive inductive loads directly, and what protection is recommended?

TLP3547(F) can switch inductive loads such as solenoids and relays, but requires external flyback protection due to lack of integrated clamp diodes. A bidirectional TVS diode (e.g., SMAJ24A) rated for ≥60 V standoff and ≥100 W peak pulse power must be placed across the output terminals (pins 5–6 or 5–7) to suppress voltage spikes exceeding the 60 V V_OFF rating. Without suppression, inductive kickback may cause premature device failure. TLP3547(F)'s 2500 Vrms isolation prevents coupling of transients to the LED side, preserving control-side integrity.