Toshiba Semiconductor and Storage TLP3544(F)

Overview

TLP3544(F) from Toshiba Electronic Devices & Storage Corporation is a normally-opened photorelay IC comprising an infrared LED optically coupled to a photo MOSFET in a 6-pin DIP package. It delivers 3.5 A max ON-state current (A connection), 60 mΩ max ON-resistance, and 40 V min OFF-state voltage - enabling solid-state replacement of mechanical relays in AC/DC power line switching applications.

For engineers reviewing the TLP3544(F) datasheet, TLP3544(F) pinout, TLP3544(F) application, or TLP3544(F) equivalent, key selection criteria include verified isolation voltage (2500 Vrms), low trigger LED current (≤3 mA), thermal derating behavior, and A/B/C connection configuration compatibility with load-side grounding schemes.

Technical Context

The TLP3544(F) implements optical isolation between input LED and output photo-MOSFET stages, eliminating galvanic coupling while supporting bidirectional AC/DC load control. Its internal structure treats Pins 1–3 as a single anode/cathode/N.C. node and Pins 4–6 as a consolidated drain-source-drain output terminal group per the 11-7A8S package definition.

Three configurable output connections (A, B, C) define distinct current paths and thermal dissipation profiles: A-connection supports 3.5 A continuous, B-connection enables lower R_ON (15 mΩ typ.) at 3.5 A, and C-connection allows pulsed 7 A operation - all constrained by junction temperature limits and derating curves across -40°C to +85°C ambient.

Key Specifications

Pinout & Package

Housed in a 6-pin DIP package designated 11-7A8S (0.4 g typical weight), the TLP3544(F) uses a dual-terminal architecture: input side (Pins 1–3) and output side (Pins 4–6) are internally shorted per functional grouping, not individual pin assignment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3544(F), TLP3546(F) extends voltage blocking capability without changing footprint or drive requirements, while PVG612A trades current capacity and through-hole compatibility for reduced R_ON and smaller size - neither is pin-compatible, but both serve overlapping relay-replacement use cases.

Availability

TLP3544(F) is available at Aetrix Electronics and suitable for security systems, factory automation (FA), measuring instruments, and amusement equipment requiring stable component supply, long-lifecycle support, and certified isolation performance.

Supply support for TLP3544(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 high-reliability semiconductor components for industrial, automotive, and consumer applications, with emphasis on optical isolation and power control technologies.

The TLP3544(F) belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of mechanical relays in AC/DC power switching - prioritizing low R_ON, high isolation, and long operational life under repetitive load cycling.

FAQ

What is the maximum continuous load current supported by the TLP3544(F) in A-connection mode?

The TLP3544(F) supports a maximum continuous ON-state current of 3.5 A in A-connection configuration at 25°C ambient, derating linearly to zero at 125°C junction temperature. This rating assumes proper PCB copper area and airflow; actual usable current depends on thermal design and duty cycle. The TLP3544(F) datasheet specifies -35 mA/°C derating for A-connection above 25°C ambient.

Does the TLP3544(F) require an external current-limiting resistor for the input LED?

Yes, the TLP3544(F) requires an external series resistor to limit LED forward current to ≤25 mA (recommended operating max) and ensure reliable triggering at ≤3 mA. For a 5 V supply, a 220 Ω resistor sets IF ≈ 18 mA; for 3.3 V, a 100 Ω resistor yields IF ≈ 23 mA. The TLP3544(F) does not integrate current regulation, so resistor selection must account for supply tolerance and LED VF variation (1.18–1.48 V).

Can the TLP3544(F) switch AC loads directly, or is additional circuitry required?

The TLP3544(F) can switch AC loads directly due to its bidirectional output MOSFET structure and 40 V min OFF-state voltage rating. However, for 120/240 VAC mains applications, external snubbers and overvoltage clamping (e.g., MOVs) are mandatory to suppress dv/dt-induced turn-on and transient spikes. The TLP3544(F) itself provides isolation but does not include built-in AC protection components.

What safety certifications apply to the TLP3544(F)?

The TLP3544(F) is UL-recognized under File No. E67349 (per UL 1577) and cUL-recognized under CSA Component Acceptance Service No. 5A File No. E67349. These certifications validate its 2500 Vrms isolation rating and construction for use in end equipment requiring reinforced insulation. Certification applies to the device itself - final system approval remains the responsibility of the equipment manufacturer.

How does the TLP3544(F) differ from mechanical relays in terms of lifetime and reliability?

The TLP3544(F) offers >10⁹ operations minimum lifetime versus ~10⁵–10⁷ cycles for electromechanical relays, with no contact wear, bounce, or arcing. Its solid-state construction eliminates moving parts, enabling silent operation and immunity to vibration. The TLP3544(F) maintains consistent R_ON and timing over life, unlike mechanical relays whose contact resistance increases with oxidation and pitting.