Toshiba Semiconductor and Storage TLP3122A(TPL,E

Overview

TLP3122A(TPL,E) from Toshiba Electronic Devices & Storage Corporation is a halogen-free, normally-open photorelay IC in a 4-pin SO6 (11-4M1S) package, featuring 3750 Vrms isolation, 60 V OFF-state voltage, and 1.4 A max ON-state current with 0.25 Ω max R_ON. It replaces mechanical relays in high-reliability on/off control of DC loads up to 48 V in battery management and PLC systems.

For engineers reviewing the TLP3122A(TPL,E) datasheet, TLP3122A(TPL,E) pinout, TLP3122A(TPL,E) application, or TLP3122A(TPL,E) equivalent, key selection criteria include verified 1.4 A continuous output capability, UL 1577/UL 508 and VDE EN 60747-5-5 safety certification, 3 mA max trigger LED current, and SO6 package compatibility with automated SMT assembly for industrial control and test equipment.

Technical Context

The TLP3122A(TPL,E) integrates a GaAs infrared LED optically coupled to a photo-MOSFET output stage, enabling galvanic isolation without magnetic components. Its two-terminal internal configuration-Pins 1 & 3 shorted (LED anode/cathode), Pins 4 & 6 shorted (MOSFET drain)-simplifies PCB routing while maintaining 5.0 mm creepage and clearance.

It operates across –40°C to +110°C ambient temperature with derated ON-current (1.4 A at 25°C, down to 0.9 A at 85°C per UL 508), and delivers sub-3 ms turn-on/1 ms turn-off switching under 20 V, 200 Ω load conditions. Safety compliance includes dual UL recognition (E67349 and E499232) and optional VDE approval via V4 suffix.

Key Specifications

Pinout & Package

Package: 4-terminal SO6 (TOSHIBA 11-4M1S), 5.0 mm creepage/clearance, 0.2 mm internal isolation thickness, 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 APV1121S, the TLP3122A(TPL,E) delivers optimal balance of 1.4 A rating, 0.25 Ω R_ON, and full UL 508 recognition-making it the preferred choice for industrial PLC outputs and BMS main-switch control where reliability and thermal efficiency are co-prioritized.

Availability

TLP3122A(TPL,E) is available at Aetrix Electronics and suitable for battery management systems (non-automotive), programmable logic controllers, automatic test equipment, and security system control panels requiring stable component supply and long-term industrial lifecycle support.

Supply support for TLP3122A(TPL,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 and manufactures discrete semiconductors, power devices, and optoelectronics for industrial, automotive, and consumer applications.

The TLP3122A(TPL,E) belongs to Toshiba's photorelay product line, engineered specifically for mechanical relay replacement in high-reliability DC switching applications demanding low R_ON, high isolation, and extended temperature operation.

FAQ

What is the maximum continuous ON-state current rating for the TLP3122A(TPL,E)?

The TLP3122A(TPL,E) has a maximum continuous ON-state current rating of 1.4 A at 25°C ambient temperature. This value decreases linearly with rising temperature-derating to 0.9 A at 85°C per UL 508 specifications. The device must be used within these limits to ensure reliability and avoid thermal runaway; exceeding them risks permanent degradation of the photo-MOSFET channel. Always verify actual board-level thermal performance using the R_ON-vs-T_a curve in the datasheet.

Does the TLP3122A(TPL,E) require an external current-limiting resistor for the LED input?

Yes, the TLP3122A(TPL,E) requires an external series resistor to limit LED forward current to ≤3 mA maximum. For example, with a 3.3 V MCU GPIO, a 1.0 kΩ resistor yields ~2.0 mA IF (assuming VF ≈ 1.27 V), staying safely within the 3 mA trigger threshold. Omitting this resistor risks LED overcurrent and accelerated aging. The resistor value must be recalculated for each supply voltage and operating temperature using the VF-vs-IF and IF-vs-Ta curves in the datasheet.

Can the TLP3122A(TPL,E) switch AC loads?

No, the TLP3122A(TPL,E) is rated exclusively for DC load switching. Its photo-MOSFET output structure lacks bidirectional blocking capability and is specified only for DC voltages up to 60 V OFF-state and continuous currents up to 1.4 A. Attempting to switch AC loads will cause immediate failure due to reverse-bias breakdown of the MOSFET body diode. For AC applications, select a zero-crossing triac-based photocoupler such as the TLP3062 or similar.

What safety certifications does the TLP3122A(TPL,E) hold?

The TLP3122A(TPL,E) holds UL 1577 recognition (File E67349), cUL recognition to CSA Component Acceptance Service No. 5A File E67349, and UL 508 recognition (File E499232). It also meets VDE EN 60747-5-5 when ordered with the V4 option suffix. These certifications validate its suitability for industrial control equipment, including PLC output modules and factory automation systems requiring reinforced insulation and touch-safe isolation.

How is the pin configuration arranged on the TLP3122A(TPL,E) SO6 package?

The TLP3122A(TPL,E) uses a 4-terminal SO6 package (TOSHIBA 11-4M1S) with internal shorting: Pins 1 and 3 form the LED anode/cathode pair, while Pins 4 and 6 are internally connected as the MOSFET drain node. There is no dedicated source terminal-the external circuit must provide the return path (e.g., ground or negative rail). This two-terminal input/two-terminal output topology simplifies layout but requires careful attention to PCB trace routing to maintain 5.0 mm creepage between input and output sides.