Toshiba Semiconductor and Storage TLP3475SRHA4(TPE

Overview

TLP3475SRHA4 from Toshiba Electronic Devices & Storage Corporation is a 4-channel photorelay IC comprising infrared LED-driven photo-MOSFETs in a single S-VSON16T package. It delivers 1 Ω typical on-resistance, 220 µs turn-on time, and 60 V off-state output voltage, enabling high-speed signal switching in automated test equipment.

For engineers reviewing the TLP3475SRHA4 datasheet, TLP3475SRHA4 pinout, TLP3475SRHA4 application, or TLP3475SRHA4 equivalent, key selection criteria include guaranteed 125 °C operation, built-in input resistor for space savings, and channel-isolated switching performance in high-frequency logic and memory testers.

Technical Context

The TLP3475SRHA4 integrates four independent normally-open (1-Form-A) photo-MOSFET channels, each optically isolated by an internal GaAs LED coupled to a silicon MOSFET detector. Its dual-terminal architecture groups pins 1–8 (LED anodes/cathodes) and 9–16 (drain terminals) into two common nodes per channel.

It operates with 3.3 V typical input forward voltage and supports up to 250 mA continuous ON-state current per channel at ≤125 °C ambient. Switching is optimized via low output capacitance (1 pF typ.) and fast t_ON/t_OFF (220/50 µs typ.), meeting requirements for high-speed ATE probe card routing and signal path control.

Key Specifications

Pinout & Package

S-VSON16T package: 2.0 mm × 6.25 mm × 1.3 mm body, 0.4 mm pitch, halogen-free epoxy resin, weight 0.04 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3475SRA4 and PS8501-AX, the TLP3475SRHA4 offers superior space efficiency via its 2.0 mm × 6.25 mm S-VSON16T package and eliminates external biasing components - critical for next-generation high-pin-count probe cards where trace routing and thermal management are constrained.

Availability

TLP3475SRHA4 is available at Aetrix Electronics and suitable for probe card assembly, automatic test equipment (ATE) design, and high-speed logic IC tester development requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TLP3475SRHA4 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 test equipment markets, with expertise in optoelectronics and power management ICs.

The TLP3475SRHA4 belongs to Toshiba's photorelay product line, engineered specifically for high-speed, high-density signal switching in automated test systems - emphasizing thermal robustness, low on-resistance, and miniaturized packaging.

FAQ

What is the maximum continuous ON-state current per channel for the TLP3475SRHA4?

The TLP3475SRHA4 supports a maximum continuous ON-state current of 250 mA per channel at ambient temperatures up to 125 °C. Derating applies above 25 °C: −2.27 mA/°C. This rating is validated under recommended operating conditions with proper PCB thermal relief and is critical for sustaining reliable switching in high-duty-cycle ATE applications.

Does the TLP3475SRHA4 require an external current-limiting resistor on the LED side?

No - the TLP3475SRHA4 integrates a built-in input resistor, eliminating the need for external current-limiting components. This simplifies PCB layout and saves board space in compact probe cards. The internal resistor enables direct connection to standard 3.3 V or 5 V logic drivers while maintaining I_IN within the 3.5–10 mA range specified in the datasheet.

What is the isolation voltage rating and how is it tested for the TLP3475SRHA4?

The TLP3475SRHA4 has a minimum isolation voltage rating of 300 V_rms, tested per AC 60-second withstand protocol at ≤60 % relative humidity. This isolation is maintained between the LED input side (pins 1–8) and MOSFET output side (pins 9–16), ensuring signal integrity and safety in mixed-voltage ATE environments where controller and DUT domains operate at different potentials.

Can the TLP3475SRHA4 be used in applications requiring operation above 125 °C ambient?

No - the TLP3475SRHA4 is rated for operation from −40 to +125 °C ambient. Exceeding 125 °C ambient violates absolute maximum ratings and risks accelerated degradation of LED luminance and MOSFET threshold stability. For higher-temperature environments, thermal management (e.g., localized heatsinking, airflow, or derating) must ensure junction temperature remains ≤135 °C.

How are the drain terminals configured on the TLP3475SRHA4 and why are there two per channel?

Each channel has two drain terminals: pins 9/10, 11/12, 13/14, and 15/16. These are electrically common per channel and provide parallel current paths to reduce effective on-resistance and inductance. This dual-drain layout improves high-frequency signal integrity and thermal dissipation - essential for stable switching in high-speed memory testers where signal edge fidelity is critical.