Toshiba Semiconductor and Storage TLP3149(F

Overview

TLP3149(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 I/O interface boards and factory automation power switching.

For engineers reviewing the TLP3149(F) datasheet, TLP3149(F) pinout, TLP3149(F) application, or TLP3149(F) equivalent, key selection criteria include verified isolation voltage (1500 Vrms), low trigger LED current (3 mA max), fast switching (0.4 ms typ. turn-on), and UL/cUL safety certification - all critical for reliable high-voltage signal isolation and load control in test equipment and industrial control systems.

Technical Context

The TLP3149(F) implements optical coupling between GaAs-based infrared LED input and dual-drain MOSFET output, with internal photodiode array driving integrated gate circuitry to achieve zero-crossing–free, DC-capable switching. Its two-terminal configuration (Pins 1+2 shorted as LED anode/cathode; Pins 3+4 shorted as common drain) simplifies PCB layout while maintaining galvanic isolation.

Designed for direct replacement of electromechanical relays, it operates across –40°C to +110°C ambient, supports 5–80 V supply range, and maintains <1 µA off-state leakage at 100 V, enabling stable performance in ATE and measuring instruments where signal integrity and long-term reliability are essential.

Key Specifications

Pinout & Package

Package: 4-pin SOP (TOSHIBA designation 11-5H1S), 2.54 mm lead pitch, 2.1 mm height, 0.1 g typical weight.

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(F) uniquely balances 1.5 A current handling, 200 mΩ conduction loss, and certified 1500 Vrms isolation - making it optimal for industrial I/O and ATE applications requiring both power capability and safety compliance without trade-offs in either domain.

Availability

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

Supply support for TLP3149(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, with expertise in optoelectronics, power devices, and logic ICs for industrial and automotive markets.

The TLP3149(F) belongs to Toshiba's photorelay product line, engineered specifically to replace electromechanical relays in industrial control, test instrumentation, and safety-critical I/O systems where longevity, noise immunity, and regulatory compliance are mandatory.

FAQ

What is the maximum continuous load current supported by the TLP3149(F)?

The TLP3149(F) supports a maximum continuous on-state current of 1.5 A at 25°C ambient, derating linearly to 0 A at 110°C case temperature. This rating assumes proper PCB copper area (≥100 mm² per drain pad) and free-air convection cooling. Exceeding this limit risks thermal runaway and permanent degradation of the MOSFET output stage. Always verify actual board-level thermal performance using the TLP3149(F)'s published I_ON–T_a curve (Fig. 12.2) in the official datasheet.

Does the TLP3149(F) require an external gate resistor on the output side?

No, the TLP3149(F) does not require an external gate resistor because its output is a fully integrated photo-MOSFET with built-in gate drive circuitry. The device uses internal photodiode arrays to generate gate voltage directly from LED illumination - eliminating external bias networks. However, a series current-limiting resistor is mandatory on the input (LED) side to constrain forward current to ≤3 mA for reliable triggering and long-term LED lifetime.

Can the TLP3149(F) switch AC waveforms, or is it DC-only?

The TLP3149(F) can switch both DC and AC waveforms up to 100 V peak, as its output MOSFET structure supports bidirectional conduction when used with appropriate snubbing. Unlike TRIAC-based optocouplers, it has no minimum load requirement and operates down to 0 V. However, for AC mains applications above 50 V RMS, additional external protection (e.g., MOVs, RC snubbers) is recommended to suppress voltage transients that could exceed the 100 V V_OFF rating.

How is isolation verified for the TLP3149(F), and what standards apply?

Isolation for the TLP3149(F) is verified per UL1577 (File No. E67349) and CSA Component Acceptance Service (No. 5A File No. E67349), with a minimum withstand voltage of 1500 Vrms for 60 seconds at ≤60% relative humidity. Test conditions include AC voltage applied between input (Pins 1+2) and output (Pins 3+4) terminals, with leakage current monitored. This certification covers production lot sampling - individual units are not tested, but statistical process control ensures compliance across all TLP3149(F) shipments.

What is the significance of Pins 3 and 4 being internally shorted in the TLP3149(F)?

Pins 3 and 4 are internally connected to the same MOSFET drain node, providing dual physical terminals for enhanced current handling and thermal dissipation. This design allows PCB layout flexibility - e.g., routing one pin to a high-current trace and the other to a heatsink pad - while maintaining identical electrical potential. It does not enable independent switching or half-bridge operation; both pins must be used as a single output node in all TLP3149(F) applications.