Toshiba Semiconductor and Storage TLP170D(TP,F)

Overview

TLP170D(TP,F) from Toshiba Electronic Devices & Storage Corporation is a normally-open photorelay IC comprising an infrared LED optically coupled to a photo-MOSFET in a 4-pin SOP package. It requires ≤1 mA LED trigger current, supports up to 200 V OFF-state voltage and 200 mA ON-state current, and delivers ≤8 Ω ON-resistance - ideal for low-power mechanical relay replacement in industrial control systems.

For engineers reviewing the TLP170D(TP,F) datasheet, TLP170D(TP,F) pinout, TLP170D(TP,F) application, or TLP170D(TP,F) equivalent, key selection criteria include isolation voltage (1500 Vrms), switching speed (typ. 3.0 ms turn-on), thermal derating behavior, and SOP-4 package compatibility with automated PCB assembly.

Technical Context

The TLP170D(TP,F) implements optical isolation via GaAs LED-to-photo-MOSFET coupling, enabling galvanic separation between input and output circuits. Its internal structure treats Pins 1–2 as a single anode–cathode pair and Pins 3–4 as paralleled drain terminals - confirming true 2-terminal output configuration.

It operates as a solid-state switch with zero-crossing–independent turn-on, rated for −40°C to +85°C ambient operation and designed for DC/AC load switching up to 160 V supply. The device meets UL 1577 and CSA Component Acceptance standards with 0.8 pF input-to-output capacitance and 5×10¹⁰ Ω isolation resistance.

Key Specifications

Pinout & Package

Package: SOP-4 (2.54 mm pitch, 2.1 mm height, JEDEC MS-012 variant 11-5H1S; 0.1 g typical weight).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP170G(TP,F), the TLP170D(TP,F) offers tighter RON tolerance and lower trigger current but reduced OFF-state voltage margin; versus PS7141-AL, it trades speed and on-resistance for higher voltage capability and industrial temperature range compliance.

Availability

TLP170D(TP,F) is available at Aetrix Electronics and suitable for factory automation, security equipment, and measuring instruments requiring stable component supply and long-term industrial lifecycle support.

Supply support for TLP170D(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 for industrial, automotive, and consumer applications.

The TLP170D(TP,F) belongs to Toshiba's photorelay product line, engineered specifically for replacing electromechanical relays in space-constrained, low-power, high-isolation industrial control systems.

FAQ

What is the maximum allowable ambient temperature for continuous operation of the TLP170D(TP,F)?

The TLP170D(TP,F) is rated for continuous operation from −40°C to +85°C ambient temperature. Derating applies above 25°C: ON-state current decreases by −2.0 mA/°C and input forward current by −0.5 mA/°C. Operation beyond +85°C risks exceeding the 125°C junction temperature limit and accelerated parametric drift. Always verify thermal design using the curves in Figure 12.2 of the official TLP170D(TP,F) datasheet.

Does the TLP170D(TP,F) support AC load switching?

Yes, the TLP170D(TP,F) supports AC load switching up to 200 V peak due to its 200 V minimum OFF-state output terminal voltage rating and bidirectional photo-MOSFET output structure. It has no intrinsic polarity limitation and can switch both half-cycles of 120/230 VAC lines. However, it does not provide zero-crossing detection - turn-on occurs immediately upon LED activation, which may cause inrush current in capacitive loads.

What is the recommended LED series resistor value for driving the TLP170D(TP,F) from a 3.3 V MCU GPIO?

For reliable turn-on with margin, use a 2.2 kΩ resistor: at 3.3 V supply and 1.15 V typical VF, this yields ~1.0 mA LED current - within the 0.4–1.0 mA typical IFT range and well below the 25 mA absolute max. Lower values (e.g., 1.5 kΩ) increase margin against aging and temperature drift but raise power consumption. Always confirm actual VF and IFT at operating temperature using the TLP170D(TP,F) datasheet's Figure 12.3 and Figure 12.6.

How is isolation verified between input and output in the TLP170D(TP,F)?

Isolation in the TLP170D(TP,F) is verified per UL 1577 and CSA Component Acceptance standards via 1500 Vrms AC withstand testing for 60 seconds at ≤60% relative humidity. The device is treated as a two-terminal device: Pins 1 and 2 are shorted together as the input port, and Pins 3 and 4 are shorted as the output port. Measured isolation resistance exceeds 5×10¹⁰ Ω, and input-to-output capacitance is 0.8 pF - critical for noise-sensitive analog or communication circuits.

Can the TLP170D(TP,F) replace a mechanical relay in a 24 VDC solenoid control circuit?

Yes, the TLP170D(TP,F) can replace a mechanical relay in 24 VDC solenoid control if the solenoid's steady-state current is ≤200 mA and inrush current remains within the 300 mW output power dissipation limit. Its 8 Ω max RON causes ≤0.48 V drop at 60 mA - acceptable for most 24 V solenoids. Confirm thermal performance using Figure 12.2 (ION vs. Ta) and ensure flyback suppression is provided externally, as the TLP170D(TP,F) lacks integrated clamp diodes.