Toshiba Semiconductor and Storage TLP3481(TP,E

Overview

TLP3481(TP,E from Toshiba Electronic Devices & Storage Corporation is a normally-open photorelay IC comprising an infrared LED optically coupled to a photo MOSFET in a P-SON4 package. It delivers 3 A max ON-state current, 45 mΩ typ. ON-resistance, and 60 V min OFF-state voltage-enabling high-speed switching in automated test equipment with low conduction loss and galvanic isolation.

For engineers reviewing the TLP3481(TP,E datasheet, TLP3481(TP,E pinout, TLP3481(TP,E application, or TLP3481(TP,E equivalent, key selection criteria include verified 500 Vrms isolation, sub-2 ms turn-on/turn-off timing, halogen-free resin compliance, and compatibility with high-current, high-reliability ATE signal routing architectures.

Technical Context

The TLP3481(TP,E implements optical coupling between an input GaAs LED and output silicon MOSFET, eliminating electrical continuity while enabling DC-to-DC signal transfer. Its internal structure treats Pins 1–2 as a single anode–cathode pair and Pins 3–4 as a common drain output terminal-functioning as a two-terminal solid-state switch with no gate drive required.

It operates within −40 °C to +110 °C ambient range and supports up to 3 A continuous load at ≤85 °C, with derating applied above that temperature. Switching performance is characterized at V_DD = 20 V and R_L = 200 Ω, delivering 1.4 ms typical turn-on and 0.08 ms typical turn-off times under 5 mA LED drive.

Key Specifications

Pinout & Package

P-SON4 package (Toshiba designation: 11-4Q1), 2.5 × 2.5 × 0.9 mm, 20 mg typical weight, halogen-free resin encapsulation, with exposed thermal pad on underside for enhanced thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PVG612A and TLP176AM, the TLP3481(TP,E offers the best balance of high current (3 A), low R_ON (45 mΩ typ.), and fast switching (1.4 ms t_ON) in the P-SON4 form factor-making it optimal for high-throughput ATE where thermal efficiency and timing fidelity are critical.

Availability

TLP3481(TP,E is available at Aetrix Electronics and suitable for automatic test equipment, high-speed memory testers, and measuring instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant halogen-free manufacturing.

Supply support for TLP3481(TP,E 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 computing applications, with emphasis on optoelectronics, power devices, and storage solutions.

The TLP3481(TP,E belongs to Toshiba's photorelay product line, engineered specifically for high-speed, high-cycle-count signal switching in automated test and precision measurement systems where galvanic isolation and minimal on-resistance are essential.

FAQ

What is the maximum continuous current rating for the TLP3481(TP,E?

The TLP3481(TP,E has a maximum continuous ON-state current rating of 3 A at ambient temperatures up to 85 °C, with linear derating to zero at 125 °C junction temperature. This rating applies to both Pins 3 and 4, which are internally shorted as a single output terminal. The TLP3481(TP,E must be mounted on a PCB with adequate copper area or thermal vias to maintain junction temperature within limits during sustained 3 A operation.

Does the TLP3481(TP,E require an external gate resistor or driver circuit?

No, the TLP3481(TP,E does not require an external gate resistor or driver circuit because it uses an integrated photo-MOSFET structure activated solely by its internal infrared LED. A current-limited LED drive of ≤3 mA (max trigger) is sufficient for full turn-on, compatible with standard 3.3 V or 5 V logic outputs. The TLP3481(TP,E contains no external control pins or bias networks-its operation is fully self-contained within the P-SON4 package.

What is the meaning of "(TP,E" in the TLP3481(TP,E part number?

The suffix "(TP,E" in TLP3481(TP,E indicates tape-and-reel packaging (TP) and RoHS-compliant, halogen-free resin construction (E). TP denotes embossed carrier tape per EIA-481 standard, 1500 pcs per reel; E confirms compliance with EU Directive 2011/65/EU and Toshiba's halogen-free material specification (Br/Cl/Sb ≤ 0.09 wt%, total Br+Cl ≤ 0.15 wt%). The TLP3481(TP,E is not lead-free in the solderable terminations-only the molding compound is halogen-free.

Can the TLP3481(TP,E be used in AC switching applications?

The TLP3481(TP,E is rated for DC-only operation with a maximum OFF-state voltage of 60 V and no specified AC peak or RMS rating. Its internal MOSFET structure lacks body diode symmetry or bidirectional blocking capability, making it unsuitable for true AC line switching. For AC applications, the TLP3481(TP,E may only be used to control DC-biased signals or as a unidirectional switch in half-wave rectified paths-not as a general-purpose AC SSR. Always verify waveform polarity and voltage polarity before deploying the TLP3481(TP,E in any AC-coupled circuit.

How is thermal management handled for the TLP3481(TP,E at 3 A load current?

At 3 A load current, the TLP3481(TP,E dissipates up to 270 mW (3 A² × 0.1 Ω max R_ON)-requiring PCB-level thermal design including ≥100 mm² of 2-oz copper connected to the exposed thermal pad on the underside of the P-SON4 package. Thermal vias (≥4×0.3 mm) to inner ground planes reduce junction-to-ambient thermal resistance to ≤60 °C/W. The TLP3481(TP,E datasheet specifies 125 °C max junction temperature; operation above 85 °C ambient requires active airflow or derated current to prevent thermal runaway.