TLP281-4GB

The TLP281-4GB is a 4-channel photocoupler (optoisolator) from Toshiba, designed for signal isolation in electronic circuits. It features GaAs infrared LEDs paired with phototransistors, providing electrical isolation between input and output (up to 3750Vrms).
Key specifications:
- Isolation voltage: 3750Vrms
- Current Transfer Ratio (CTR): 50% (min)
- Switching speed: ~3μs (turn-on/off)
- Supply voltage: 5V typical
- Package: DIP-16
Applications include noise suppression, logic level shifting, and isolating digital signals in industrial controls, PLCs, and power electronics.
The "-4GB" suffix indicates a 4-channel variant with standard CTR. Alternatives include TLP281-4 (lower CTR) and TLP281-4GR (higher CTR).
For detailed specs, refer to Toshiba’s datasheet.

The TLP281-4GB is a photocoupler (optoisolator) with the following key features:
- 4-channel isolation for signal transmission between circuits.
- High isolation voltage (5000 Vrms) for safety and noise reduction.
- Low input current (5 mA typical) for energy efficiency.
- Fast response time (3 μs max) for high-speed signal transfer.
- Compact DIP-16 package for space-saving PCB design.
- Wide operating temperature range (-40°C to +100°C) for harsh environments.
- LED input with current limiting resistor for simplified circuit design.
- Compatible with TTL/CMOS logic levels for versatile interfacing.
Ideal for industrial controls, PLCs, and digital isolation applications.

The TLP281-4GB is a 4-channel photocoupler (optoisolator) with a 16-pin DIP package.
Pin Functions:
- Pins 1-4: Anode inputs for channels 1-4.
- Pins 5-8: Cathode inputs for channels 1-4.
- Pins 9-12: Emitter outputs for channels 1-4.
- Pins 13-16: Collector outputs for channels 1-4.
Key Features:
- Provides electrical isolation (up to 5kVrms).
- High-speed response (1Mbps typical).
- Low power consumption.
- Used in signal isolation, PLCs, and industrial controls.
Each channel consists of an LED (input) and a phototransistor (output), ensuring galvanic isolation.

The TLP281-4GB is manufactured by Toshiba, a well-known Japanese multinational conglomerate specializing in electronics, semiconductors, and industrial components. Toshiba is recognized for its high-quality optocouplers and isolation devices, including the TLP281-4GB, which is a 4-channel photocoupler used for signal isolation in industrial and electronic applications.
Toshiba has a strong reputation in technology innovation, though its semiconductor division was acquired by Renesas Electronics in 2021. Despite this, Toshiba-branded optocouplers like the TLP281-4GB remain widely used.

The TLP281-4GB is a photocoupler (optoisolator) commonly used for signal isolation in various applications. Key areas include:
1. Industrial Automation – Isolating control signals in PLCs, motor drives, and sensors.
2. Power Electronics – Protecting circuits in inverters, converters, and power supplies.
3. Medical Equipment – Ensuring safety in patient-connected devices.
4. Telecommunications – Signal isolation in communication interfaces.
5. Consumer Electronics – Noise reduction in appliances and displays.
Its high-speed, compact design makes it ideal for noise-sensitive and high-voltage isolation needs.