Toshiba Semiconductor and Storage TLP3553A(TP1,F

Overview

TLP3553A(TP1,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 max ON-state current, 50 mΩ max ON-resistance, and 2500 Vrms isolation voltage-enabling solid-state replacement of mechanical relays in HVAC power switching and factory automation control circuits.

For engineers reviewing the TLP3553A(TP1,F) datasheet, TLP3553A(TP1,F) pinout, TLP3553A(TP1,F) application, or TLP3553A(TP1,F) equivalent, key selection criteria include its UL-recognized (UL 1577, UL 508) and VDE-approved (EN 60747-5-5 with D4 option) safety certifications, 3 mA max trigger LED current, and dual-drain output configuration for high-current AC/DC load switching.

Technical Context

The TLP3553A(TP1,F) implements optical isolation via GaAs LED-to-Si MOSFET coupling, with pins 1–2 forming the input LED anode/cathode pair and pins 3–4 internally shorted as a common drain output terminal. Its design supports direct drive from microcontroller GPIOs (IF ≤ 3 mA) and handles resistive/inductive loads up to 30 V OFF-state voltage.

It operates across –40°C to 110°C ambient temperature with derated ON-current (2.6 A at 85°C per UL 508), and features 0.6 ms typical turn-on time and 0.3 ms typical turn-off time under 20 V supply and 200 Ω load conditions-optimized for fast, low-noise switching in automatic test equipment and security system controllers.

Key Specifications

Pinout & Package

Package: 4-pin DIP (TOSHIBA 11-5B2S), through-hole mounting, 7.62 mm lead pitch, 0.26 g typical weight. RoHS-compliant, lead-free (LF1/TP1 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3553A(TP1,F), TLP3543A(TP1,F) trades current capacity for tighter thermal performance in identical packaging, while PVG612A shifts to SMT for production scalability-neither is pin-compatible, but both serve overlapping industrial relay-replacement use cases with distinct layout and power trade-offs.

Availability

TLP3553A(TP1,F) is available at Aetrix Electronics and suitable for HVAC control systems, factory automation PLC outputs, and security system alarm circuits requiring stable component supply, long-term lifecycle support, and certified isolation performance.

Supply support for TLP3553A(TP1,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 discrete semiconductors, power devices, and optoelectronics for industrial, automotive, and consumer applications-with emphasis on reliability, safety certification, and system-level integration.

The TLP3553A(TP1,F) belongs to Toshiba's photorelay product line, engineered specifically for mechanical relay replacement in industrial control, building automation, and test equipment-delivering zero-contact switching, long lifetime, and certified isolation.

FAQ

What is the maximum continuous ON-state current rating for TLP3553A(TP1,F)?

The TLP3553A(TP1,F) has a maximum continuous ON-state current rating of 4 A at 25°C ambient temperature. This rating decreases with rising temperature: it is derated to 2.6 A at 85°C per UL 508 specifications. The dual-drain output (Pins 3 and 4) helps distribute current and manage thermal stress during sustained conduction, making TLP3553A(TP1,F) suitable for high-duty-cycle industrial switching applications.

Does TLP3553A(TP1,F) support direct microcontroller GPIO drive without external components?

Yes, TLP3553A(TP1,F) supports direct drive from standard 3.3 V or 5 V microcontroller GPIOs because its maximum trigger LED current is only 3 mA. With a typical forward voltage of 1.64 V at 10 mA, a simple series resistor (e.g., 330 Ω for 5 V GPIO) suffices-no transistor buffer or dedicated LED driver IC is required. This simplifies circuit design and reduces bill-of-materials cost in TLP3553A(TP1,F)-based control modules.

What safety certifications apply to TLP3553A(TP1,F), and are they pre-verified for this specific variant?

TLP3553A(TP1,F) carries UL 1577 (File E67349), UL 508 (File E499232), and CSA Component Acceptance (File E67349) certifications. For VDE approval per EN 60747-5-5, the D4 option must be specified (e.g., TLP3553A(D4TP1,F)). The base TLP3553A(TP1,F) variant is not VDE-approved unless ordered with the D4 marking. All certifications apply to the TLP3553A(TP1,F) part number as shipped in its 11-5B2S package.

How does the dual-drain configuration (Pins 3 and 4) impact PCB layout and thermal performance of TLP3553A(TP1,F)?

The dual-drain configuration in TLP3553A(TP1,F) allows designers to route high-current paths across two parallel copper traces or use one pin for signal routing and the other for thermal relief to an internal ground plane. This reduces effective trace resistance and improves heat dissipation-critical for maintaining 4 A conduction without exceeding junction temperature limits. Layout best practice is to connect both Pins 3 and 4 directly to the same low-impedance load return net in TLP3553A(TP1,F) implementations.

What is the typical turn-on and turn-off time for TLP3553A(TP1,F), and under what test conditions are these values measured?

TLP3553A(TP1,F) has a typical turn-on time (tON) of 0.6 ms and turn-off time (tOFF) of 0.3 ms. These values are measured under standardized conditions: RL = 200 Ω, VDD = 20 V, and IF = 5 mA, per Figure 15.1 in the official datasheet. The fast switching enables precise timing control in automatic test equipment and responsive actuation in HVAC zone control-significantly outperforming mechanical relays in cycle life and jitter consistency.