Toshiba Semiconductor and Storage TLP3106(F

Overview

TLP3106 from Toshiba Electronic Devices & Storage Corporation is a normally-open photorelay IC comprising an infrared LED optically coupled to a photo-MOSFET output stage in a 6-pin SOP package. It delivers 4.0 A max ON-state current (A-connection), 40 mΩ max ON-resistance, and 30 V min OFF-state voltage - enabling solid-state replacement of mechanical relays in AC/DC power line switching applications.

For engineers reviewing the TLP3106 datasheet, TLP3106 pinout, TLP3106 application, or TLP3106 equivalent, key selection criteria include verified isolation voltage (1500 Vrms), low trigger LED current (≤3 mA), thermal derating behavior for continuous 4 A conduction, and compatibility with factory automation control interfaces requiring galvanic separation and zero-crossing–agnostic switching.

Technical Context

The TLP3106 implements optical coupling between input and output stages to achieve reinforced isolation without magnetic or capacitive coupling paths. Its output stage uses dual N-channel MOSFETs configured in back-to-back topology to support bidirectional load current flow under DC or AC conditions.

It operates with a single-input LED drive requiring ≤3 mA forward current to initiate conduction, and supports three internal connection modes (A/B/C) - with A-connection rated for 4.0 A continuous, B for 4.0 A, and C for 8.0 A - each exhibiting distinct ON-resistance curves and thermal derating slopes per datasheet Section 6.

Key Specifications

Pinout & Package

Housed in a surface-mount 2.54 mm pitch SOP-6 package (Toshiba designation: 11-7C1S), the TLP3106 integrates two isolated functional blocks: input LED (Pins 1–3 shorted internally) and output MOSFET pair (Pins 4–6 shorted internally).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VO3120 and G3VM-61VY2, the TLP3106 uniquely combines 1500 Vrms isolation, 4.0 A current capability, and 40 mΩ R_ON in a surface-mount SOP-6 - making it the only option among the three qualified for high-current, space-constrained industrial power switching where thermal management and PCB real estate are critical.

Availability

TLP3106 is available at Aetrix Electronics and suitable for factory automation, security systems, and measuring instruments requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for TLP3106 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 consumer applications, with emphasis on isolation, power efficiency, and long-lifecycle support.

The TLP3106 belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of mechanical relays in industrial control, instrumentation, and safety-critical switching applications demanding galvanic isolation and high current density.

FAQ

What is the maximum continuous ON-state current rating for the TLP3106 in A-connection mode?

The TLP3106 supports a maximum continuous ON-state current of 4.0 A in A-connection mode at 25°C ambient, derating linearly to 0 A at 125°C junction temperature per datasheet Section 6. This rating applies only when Pins 4–6 are used as the output terminals and Pin 5 serves as the common source node. The TLP3106 must be mounted on a PCB with adequate copper area to maintain junction temperature within limits during sustained 4 A operation.

Does the TLP3106 support AC load switching, and if so, how is it implemented?

Yes, the TLP3106 supports AC load switching via its internal back-to-back N-channel MOSFET configuration across Pins 4–6. In C-connection mode, the device achieves 8.0 A peak current handling for AC waveforms by enabling symmetrical conduction in both half-cycles. The TLP3106 does not require external zero-crossing detection circuitry, unlike TRIAC-based optocouplers, because its MOSFET output conducts regardless of voltage polarity - confirmed in Figure 12.2.3 of the official datasheet.

What is the minimum LED forward current required to reliably turn on the TLP3106?

The TLP3106 guarantees turn-on with a maximum trigger LED current (I_FT) of 3 mA at 25°C, meaning any design supplying ≥3 mA to the LED (Pins 1–2) will activate the output stage under all specified operating conditions. The typical value is 0.3 mA, but system designs must target ≥3 mA to ensure margin against temperature drift, aging, and supply variation. The TLP3106 does not specify a minimum threshold - only a guaranteed maximum - so 3 mA is the design-critical ceiling value.

How is isolation voltage tested and certified for the TLP3106?

The TLP3106 is certified to UL 1577 (File No. E67349) and CSA Component Acceptance Service (No. 5A File No. E67349) with a minimum isolation voltage of 1500 Vrms, tested for 60 seconds at AC 60 Hz with humidity ≤60%. This rating applies across the full creepage and clearance distance of the 2.54SOP6 package (11-7C1S), validated using production lot sampling per Toshiba's quality protocol. The TLP3106 is not rated for working voltage or transient overvoltage - only for dielectric withstand under controlled lab conditions.

Can Pin 3 (N.C.) be left floating or must it be grounded in the TLP3106 layout?

Pin 3 is explicitly designated "N.C." (No Connection) and has no internal bond wire or silicon connection per datasheet Section 4 and Note 2. It may be left unconnected or tied to ground for mechanical stability - neither choice affects electrical performance. However, leaving Pin 3 floating is preferred to avoid unintended parasitic coupling; grounding it adds no benefit and risks introducing noise if routed near high-dV/dt nodes. The TLP3106 functions identically whether Pin 3 is open or grounded.