Toshiba Semiconductor and Storage TLP3450S(TP,E

Overview

TLP3450S(TP,E from Toshiba Electronic Devices & Storage Corporation is a surface-mount photorelay with normally-open (1-Form-A) configuration, integrating an infrared LED optically coupled to a photo-MOSFET in a S-VSON4T package. It delivers 20 V min OFF-state voltage, 160 mA max ON-state current, 6.8 Ω typ. ON-resistance, and ultra-low 0.6 pF typ. output capacitance - enabling fast switching for high-frequency signal routing in automated test equipment.

For engineers reviewing the TLP3450S(TP,E datasheet, TLP3450S(TP,E pinout, TLP3450S(TP,E application, or TLP3450S(TP,E equivalent, key selection criteria include low COFF for <100 µs turn-on/turn-off times, halogen-free resin compliance, RoHS-compliant (E suffix), and compatibility with reflow soldering per J-STD-020.

Technical Context

The TLP3450S(TP,E implements optical isolation via GaAs LED-to-photo-MOSFET coupling, delivering 500 Vrms isolation voltage and 10¹⁴ Ω min isolation resistance. Its two-terminal internal configuration shorts pins 1–2 (LED anode/cathode) and pins 3–4 (MOSFET drain/drain), simplifying PCB layout while maintaining signal integrity.

Designed for high-speed digital switching, it operates with 3 mA max trigger LED current and supports 5–16 V supply voltage across –40°C to +110°C operating range. The 0.01 g weight and 11-2E2 footprint enable dense placement in ATE probe cards and memory tester channel modules.

Key Specifications

Pinout & Package

Package: S-VSON4T (Toshiba designation 11-2E2), 1.6 mm × 1.6 mm × 0.55 mm, halogen-free resin, RoHS-compliant (E suffix), tape-and-reel (TP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3450S(TP,E, the TLP3406S(TP,E offers higher voltage tolerance but sacrifices switching speed, while the PS8501-AX provides easier handling at the cost of bandwidth and density - making TLP3450S(TP,E the optimal choice for miniaturized, high-frequency ATE signal routing.

Availability

TLP3450S(TP,E is available at Aetrix Electronics and suitable for automatic test equipment, high-speed memory testers, and measuring instruments requiring stable component supply, consistent tape-and-reel delivery, and full RoHS/halogen-free compliance.

Supply support for TLP3450S(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 high-reliability semiconductor components for industrial, automotive, and computing applications, with over 50 years of optocoupler innovation.

The TLP3450S(TP,E belongs to Toshiba's S-VSON photorelay product line, engineered specifically for high-density, high-speed signal switching in automated test systems where low capacitance and fast transient response are critical.

FAQ

What is the maximum recommended LED forward current for continuous operation of the TLP3450S(TP,E?

The TLP3450S(TP,E has an absolute maximum LED forward current (IF) rating of 30 mA at 25°C, with derating to 0 mA at 125°C. For reliable long-term operation, Toshiba recommends limiting IF to ≤20 mA under typical conditions. The TLP3450S(TP,E achieves full turn-on with only 3 mA max trigger current, so most designs operate well below the absolute maximum - reducing thermal stress and extending LED lifetime beyond 10⁶ cycles.

Does the TLP3450S(TP,E support DC and AC signal switching?

Yes, the TLP3450S(TP,E supports both DC and AC signal switching up to its bandwidth limit defined by 0.6 pF output capacitance and 8.5 Ω max ON-resistance. It is rated for 20 V DC OFF-state voltage and handles AC signals within that peak voltage envelope. The TLP3450S(TP,E is not designed for mains-voltage isolation or high-power AC loads - its use is optimized for low-power, high-speed logic and analog signal routing in test instrumentation.

How does the internal pin shorting (Pins 1–2 and 3–4) affect PCB layout for the TLP3450S(TP,E?

The TLP3450S(TP,E's internal shorting means Pins 1 and 2 form a single LED port, and Pins 3 and 4 form a single MOSFET drain port - reducing required PCB traces to two nets instead of four. This simplifies routing in dense ATE probe cards and lowers parasitic inductance. When laying out the TLP3450S(TP,E, place a single series resistor on the anode side (Pin 1) and connect both Pins 3 and 4 directly to the load path - no jumper traces needed between drains.

Is the TLP3450S(TP,E compatible with lead-free reflow soldering processes?

Yes, the TLP3450S(TP,E is qualified for lead-free reflow per JEDEC J-STD-020 Class 3A, with a peak temperature rating of 260°C for 10 seconds. Toshiba specifies reflow profiles with ramp rates ≤3°C/s and time above 217°C limited to 60–150 seconds. The TLP3450S(TP,E must be assembled within 168 hours of opening moisture-barrier packaging, and only one reflow cycle is permitted unless baking per J-STD-033 is performed.

What is the isolation resistance specification for the TLP3450S(TP,E, and how is it measured?

The TLP3450S(TP,E guarantees a minimum isolation resistance (RS) of 10¹⁴ Ω, measured at 500 VDC with relative humidity ≤60%. This value reflects the bulk resistivity of the internal molding compound and creepage distance between LED and MOSFET die. The TLP3450S(TP,E achieves this performance using halogen-free resin and optimized internal spacing - critical for preventing leakage-induced errors in high-impedance measurement circuits.