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TLP293

3750Vrms photocoupler, 50% CTR, GaAIA LED, SO6L, industrial grade

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Manufacturer Part：

TLP293

Package：

SO6L (3.7 x 4.6 x 2.3 mm, >5mm creepage/clearance)

Description

Product Overview

The TLP293 from Toshiba is a 3750Vrms photocoupler in a SO6L package with a GaAIA LED and photo-transistor detector, 50mA CTR, and 110C operating temperature for industrial isolation.

Key Specifications

Isolation Voltage	3750 Vrms (min)
LED Type	GaAIA (gallium aluminum arsenide)
Detector	Photo-transistor
CTR (Current Transfer Ratio)	50% (min) @ IF=5mA
LED Forward Current	50 mA (max)
LED Forward Voltage	1.3V (typ @ IF=5mA)
Collector Current	50 mA (max)
Collector-Emitter Voltage	80V
Bandwidth (Cutoff)	-3dB @ 80kHz (typ, RL=1kOhm)
Package	SO6L (4-pin, 3.7 x 4.6mm, wide creepage)
Operating Temperature	-55 to +110 C

Features

3750Vrms reinforced isolation voltage
50% minimum CTR at IF=5mA
High-reliability GaAIA LED (low degradation)
Wide creepage SO6L package (>5mm creepage)

Applications

Industrial control signal isolation
Switch-mode power supply feedback
Programmable logic controller I/O
Appliance motor drive isolation

Product Introduction:TLP293 Product Introduction

The TLP293 from Toshiba is a 3750Vrms isolation voltage photocoupler in a compact SO6L surface-mount package with a gallium aluminum arsenide (GaAIA) infrared LED and a silicon NPN photo-transistor detector. The GaAIA LED technology provides superior long-term reliability compared to conventional GaAs LEDs, with lower light output degradation over time, ensuring stable current transfer ratio (CTR) throughout the device lifetime. The 50% minimum CTR at IF=5mA ensures reliable signal transfer even at low LED drive currents, making the TLP293 suitable for low-power isolation applications. The SO6L package provides a creepage distance of greater than 5mm, meeting the safety requirements for reinforced isolation in industrial and appliance applications per IEC 60747-5-5 and UL 1577. The 3750Vrms isolation rating provides a safety barrier between high-voltage circuits (mains-connected) and low-voltage logic circuits. The 80V collector-emitter voltage rating is adequate for most logic-level output interfaces. The -55 to +110C operating temperature range covers industrial and consumer applications. The TLP293 is commonly used for signal isolation in switch-mode power supplies (feedback loop isolation), programmable logic controller (PLC) digital I/O, motor drive control signal isolation, and appliance safety isolation barriers.

Working Principle:TLP293 Working Principle

The TLP293 operates as an optically-coupled isolator using a GaAIA LED and photo-transistor. Key subsystems include: (1) GaAIA LED – when forward current flows through the LED (pins 1-2), infrared photons are emitted; the GaAIA (gallium aluminum arsenide) material provides higher quantum efficiency and better long-term stability than conventional GaAs LEDs; the forward voltage is approximately 1.3V at 5mA; (2) Optical Coupling – the infrared photons travel across the transparent insulation die (typically silicone or polyimide) between the LED and the photo-transistor; the dielectric strength of this insulation provides the 3750Vrms isolation rating; the coupling efficiency determines the CTR; (3) Photo-Transistor – the infrared photons strike the base region of the NPN photo-transistor, generating base current proportional to the light intensity; this photo-current is amplified by the transistor beta, producing a collector current; the CTR (IC/IF) of 50% minimum at IF=5mA means that 2.5mA of collector current is guaranteed when 5mA flows through the LED; (4) Signal Isolation – the input (LED) and output (photo-transistor) are electrically isolated; the only coupling mechanism is optical; this prevents ground loops, provides level shifting between voltage domains, and ensures safety isolation between high-voltage and low-voltage circuits; (5) Speed – the photo-transistor has a relatively slow response (bandwidth approximately 80kHz) due to the Miller capacitance and base storage effects; for faster applications, a pin photodiode or logic-output coupler should be used.

Pin Description:TLP293 Pin Definition and Functions

Pin	Name	Function
1	Anode	LED anode (input side)
2	Cathode	LED cathode (input side)
3	NC	No connect
4	Emitter	Photo-transistor emitter (output side)
5	Collector	Photo-transistor collector (output side)
6	NC	No connect

Application Scenarios:In which products and applications isTLP293 used

SMPS feedback: isolate error amplifier output from secondary to primary side in offline flyback converter
PLC digital input: 24V industrial signal isolated to 3.3V MCU input through TLP293 with pull-up resistor
Motor drive isolation: isolate PWM gate drive signals from control side in inverter drive
Appliance safety: isolate user-accessible control panel from mains-connected power electronics

Alternative Models:What chips are recommended as replacements for TLP293

Manufacturer	Part Number	Package	Notes
Toshiba	TLP291	SO6L	Lower CTR version (50% min @ IF=5mA, same as TLP293)
Toshiba	TLP785	DIP-4	Through-hole version, higher CTR
Broadcom	HCPL-817-00AE	DIP-4	Industry standard 4N25 class
Vishay	SFH610A-3	DIP-4	5300Vrms, through-hole