Toshiba Semiconductor and Storage TLP3149(TP,F

Overview

TLP3149(TP,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 1.5 A max ON-state current, 200 mΩ max ON-resistance, and 100 V OFF-state voltage in a compact 4-pin SOP package (2.54 mm pitch, 2.1 mm height), enabling solid-state replacement of mechanical relays in power line switching for ATE and factory automation.

For engineers reviewing the TLP3149(TP,F) datasheet, TLP3149(TP,F) pinout, TLP3149(TP,F) application, or TLP3149(TP,F) equivalent, key selection criteria include verified isolation voltage (1500 Vrms), low trigger LED current (≤3 mA), thermal derating behavior, and dual-drain output configuration for high-current load control without external paralleling.

Technical Context

The TLP3149(TP,F) implements optical isolation between input and output stages using GaAs-based infrared LED excitation and silicon MOSFET conduction. Its internal structure treats Pins 1–2 as a single anode–cathode pair and Pins 3–4 as a common drain output, forming a true 2-terminal device with symmetrical current-handling capability.

It operates under recommended conditions of 5–80 V supply, ≤25 mA forward LED current, and −40°C to +110°C ambient temperature. Switching performance is characterized at 20 V, 5 mA drive, delivering typical turn-on/turn-off times of 0.4 ms / 0.15 ms into a 200 Ω load - optimized for fast, low-noise I/O interface and test equipment sequencing.

Key Specifications

Pinout & Package

Package: SOP-4 (TOSHIBA designation 11-5H1S), 2.54 mm lead pitch, 2.1 mm height, 0.1 g typical weight. Surface-mount compatible with standard reflow profiles (peak 260°C, ≤10 s).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PVG612A and PS8501-AX, the TLP3149(TP,F) offers optimal balance of 1.5 A current, 200 mΩ R_ON, and 4-pin SOP compatibility - making it the preferred choice for cost-sensitive, high-reliability 24–48 V DC power switching where thermal efficiency and PCB real estate are jointly constrained.

Availability

TLP3149(TP,F) is available at Aetrix Electronics and suitable for automatic test equipment (ATE), industrial I/O interface boards, and factory automation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TLP3149(TP,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 with emphasis on reliability, safety certification, and industrial-grade performance.

The TLP3149(TP,F) belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of electromechanical relays in high-cycle, noise-sensitive industrial control and test instrumentation applications.

FAQ

What is the maximum continuous ON-state current rating for the TLP3149(TP,F)?

The TLP3149(TP,F) supports a maximum continuous ON-state current of 1.5 A at 25°C ambient, derating linearly to zero at 110°C case temperature. This rating assumes proper PCB copper area (≥100 mm² per drain pin) and free-air convection. Exceeding this limit risks thermal runaway due to the MOSFET's positive temperature coefficient of R_ON. Always verify actual board-level thermal performance using the TLP3149(TP,F)'s published I_ON–T_a curve (Fig. 12.2).

Does the TLP3149(TP,F) require an external current-limiting resistor on the LED side?

Yes - the TLP3149(TP,F) requires an external series resistor to limit LED forward current to ≤3 mA (max trigger) and ≤30 mA (absolute max). For a 5 V MCU GPIO, a 1.2 kΩ resistor yields ~3.3 mA at VF = 1.65 V, satisfying both trigger and reliability margins. The TLP3149(TP,F) does not integrate LED current regulation, so resistor selection must account for VF variation (1.5–1.8 V) and supply tolerance.

Can Pins 3 and 4 of the TLP3149(TP,F) be used independently?

No - Pins 3 and 4 are internally shorted drain terminals of the same photo-MOSFET die. They must be routed to the same net on the PCB to maintain rated 1.5 A current and thermal balance. Using them separately violates the TLP3149(TP,F)'s internal construction (confirmed in Note 1 of Absolute Maximum Ratings) and may cause uneven current sharing, localized heating, and premature failure.

What safety certifications does the TLP3149(TP,F) hold?

The TLP3149(TP,F) is UL1577 certified (File No. E67349) and cUL-approved under CSA Component Acceptance Service (File No. E67349), both validating its 1500 Vrms isolation rating. These certifications cover dielectric withstand, partial discharge, and creepage/clearance compliance for industrial equipment. The TLP3149(TP,F) does not carry IEC 60747-5-5 or VDE 0884-10 certification, limiting use in reinforced insulation systems requiring those standards.

How does the TLP3149(TP,F) behave under pulsed load conditions?

The TLP3149(TP,F) supports pulsed ON-state current up to 4.5 A (100 µs pulse, 100 pps) - three times its DC rating - provided duty cycle remains ≤1%. This allows brief inrush current handling for capacitive loads or solenoid actuation. However, the TLP3149(TP,F)'s thermal time constant requires ≥10 ms off-time between pulses to prevent junction temperature accumulation beyond 125°C. Pulse operation must reference Fig. 12.2 (I_ON–T_a) and Fig. 12.5 (R_ON–T_a) for derating.