Toshiba Semiconductor and Storage TLP3553A(F

Overview

TLP3553A(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 in a 4-pin DIP through-hole package. It delivers 4 A maximum ON-state current, 50 mΩ max ON-resistance, and 30 V min OFF-state voltage - enabling robust AC/DC power line switching in industrial control systems.

For engineers reviewing the TLP3553A(F) datasheet, TLP3553A(F) pinout, TLP3553A(F) application, or TLP3553A(F) equivalent, key selection criteria include isolation voltage (2500 Vrms), trigger LED current (≤3 mA), UL/cUL/VDE safety certifications, and compatibility with HVAC, factory automation, and ATE load-switching designs requiring zero-crossing–free solid-state relay replacement.

Technical Context

The TLP3553A(F) implements a single-pole, single-throw (1-Form-A), normally-open solid-state switch architecture. Its internal structure pairs a GaAs infrared LED with a dual-drain photo-MOSFET die, enabling galvanic isolation between input and output circuits without mechanical contacts or snubber networks.

It operates with ≤3 mA LED trigger current and sustains up to 4 A continuous load current at ≤50 mΩ ON-resistance, while maintaining ≥30 V OFF-state blocking capability. Safety compliance includes UL 1577, UL 508, and EN 60747-5-5 (with D4 option), supporting use in Class 1, Division 2 hazardous locations and industrial PLC I/O modules.

Key Specifications

Pinout & Package

Package: 4-pin DIP (TOSHIBA 11-5B2S), through-hole mounting, 7.62 mm lead pitch, creepage/clearance ≥7.0 mm, isolation thickness ≥0.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PVG612A and APV1121, the TLP3553A(F) uniquely combines 4 A current capability, 50 mΩ low R_ON, and full UL 508/EN 60747-5-5 certification in a through-hole DIP package - making it the only drop-in replacement for legacy mechanical relay sockets in certified industrial control hardware.

Availability

TLP3553A(F) is available at Aetrix Electronics and suitable for HVAC control systems, factory automation I/O modules, and automatic test equipment requiring stable component supply, long-term lifecycle support, and globally recognized safety approvals.

Supply support for TLP3553A(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 consumer applications, with emphasis on isolation, power efficiency, and safety compliance.

The TLP3553A(F) belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of electromechanical relays in industrial control, building automation, and test instrumentation where long life, silent operation, and regulatory certification are mandatory.

FAQ

What is the maximum continuous load current supported by the TLP3553A(F)?

The TLP3553A(F) supports a maximum continuous ON-state current of 4 A at ambient temperatures up to 85 °C, with derating applied above that temperature per the I_ON–T_a curve. This rating assumes proper PCB copper area for heat dissipation and operation within recommended voltage and duty-cycle limits. The TLP3553A(F) maintains this capability while delivering ≤50 mΩ ON-resistance, minimizing thermal rise during sustained conduction.

Does the TLP3553A(F) require a zero-crossing circuit for AC load switching?

No, the TLP3553A(F) does not incorporate zero-crossing detection and operates as a random-turn-on photorelay. It switches AC loads at any point in the waveform, which is acceptable for resistive and inductive loads where inrush current and EMI are managed externally. This design allows precise timing control in applications like ATE sequencing, unlike zero-crossing relays that introduce phase delay. The TLP3553A(F)'s 30 V OFF-state voltage rating applies to DC blocking; for 120/240 VAC use, external snubbers or voltage clamping may be required depending on load characteristics.

What safety certifications apply to the TLP3553A(F) out-of-the-box?

The base TLP3553A(F) carries UL 1577 and cUL recognition (File No. E67349). UL 508 recognition (File No. E499232) also applies, but only under the absolute maximum ratings specified for UL 508-compliant operation. For VDE EN 60747-5-5 approval, the TLP3553A(F) must be ordered with the D4 option (e.g., TLP3553A(D4,F)), which adds specific marking and qualification. All certifications are verified per the Rev.6.0.A datasheet dated 2026-04-07.

Can the TLP3553A(F) be used to switch 240 VAC loads?

The TLP3553A(F) has a minimum OFF-state output terminal voltage of 30 V, which is insufficient for direct 240 VAC switching. It is rated for ≤30 V DC blocking; for higher AC voltages, external protection such as series MOSFETs, TRIACs, or solid-state relay hybrids must be used. The TLP3553A(F) serves as the isolated gate driver or control-stage switch in such configurations - not the main power switch. Always verify voltage transient margins and creepage requirements per IEC 61000-4-5 when interfacing with mains-connected circuits.

How is the dual-drain configuration (Pins 3 and 4) implemented in the TLP3553A(F)?

Pins 3 and 4 of the TLP3553A(F) are internally shorted drain terminals of the photo-MOSFET output stage, forming a single 2-terminal output with doubled bond-wire capacity and reduced effective resistance. This configuration improves current sharing, thermal distribution, and reliability under high-load conditions. The dual-pin layout accommodates higher solder joint integrity and mechanical stability in through-hole PCB mounting - a deliberate design choice to support 4 A continuous conduction without external heatsinking in standard FR-4 layouts.