TIL920

TIL920 Series Optocouplers Technical Summary

Overview

The TIL920 series consists of high-performance optocouplers designed for AC-input applications. These devices integrate gallium-arsenide (GaAs) light-emitting diodes (LEDs) in a reverse-parallel configuration and silicon NPN phototransistors to provide reliable signal isolation. The series includes single-channel (TIL920), dual-channel (TIL921), and quad-channel (TIL922) variants, packaged in 4-pin, 8-pin, and 16-pin configurations, respectively. The TIL920 series is tested for a minimum current-transfer ratio (CTR) of 20%, with optional high-grade selections offering 50% or 100% CTR for enhanced performance in demanding applications.

Key Features

• AC-Input Compatibility: Reverse-parallel GaAs LEDs enable bidirectional signal transmission, making the device suitable for AC applications.
• High Isolation Voltage: Provides robust electrical isolation between input and output, ensuring safety and noise immunity.
• Multiple Channel Options: Available in single (TIL920), dual (TIL921), and quad-channel (TIL922) configurations.
• Current-Transfer Ratio (CTR) Options: Standard devices guarantee a minimum CTR of 20%, with premium selections offering 50% or 100%.
• Wide Operating Temperature Range: Designed to function reliably across industrial temperature ranges.
• Compact Packaging: Available in industry-standard 4-pin, 8-pin, and 16-pin DIP packages for easy integration.

Applications

The TIL920 series is widely used in applications requiring electrical isolation, noise suppression, or signal conditioning. Common use cases include:

• Industrial Control Systems: Isolate logic circuits from high-voltage or noisy industrial environments.
• AC Power Line Monitoring: Detect zero-crossing or phase control in power electronics.
• Medical Equipment: Ensure patient safety by isolating sensitive measurement circuits.
• Telecommunications: Protect low-voltage signal processing circuits from surges.
• Automotive Electronics: Interface between microcontrollers and high-voltage actuators.

Electrical Characteristics

The following table summarizes the key electrical specifications for the TIL920 series under typical operating conditions (25°C unless noted):

• Input Forward Voltage (V_F): 1.2V (typical) at 10mA
• Reverse Breakdown Voltage (V_R): 3V (minimum)
• Output Collector-Emitter Voltage (V_CEO): 30V (minimum)
• Current-Transfer Ratio (CTR): 20% (minimum standard), 50% or 100% (premium selections)
• Isolation Voltage (V_ISO): 2500V_RMS (minimum)
• Response Time (t_r/t_f): 3μs (rise) / 4μs (fall) typical
• Operating Temperature Range: -55°C to +100°C

Package Information

The TIL920 series is available in three package configurations:

• TIL920 (Single Channel): 4-pin DIP package with 0.3" row spacing
• TIL921 (Dual Channel): 8-pin DIP package with 0.3" row spacing
• TIL922 (Quad Channel): 16-pin DIP package with 0.3" row spacing

All packages feature molded plastic construction with a minimum creepage distance of 7.62mm to ensure proper isolation. The pinout configuration follows industry-standard optocoupler layouts for easy replacement in existing designs.

Reliability and Compliance

The TIL920 series is designed to meet stringent quality and reliability standards:

• UL Recognized Component (File E69938)
• CSA Certified (Component Acceptance Notice #5)
• IEC/EN/DIN EN 60747-5-2 compliant
• RoHS compliant
• Flammability Rating: UL94 V-0

Design Considerations

When implementing the TIL920 series in your application, consider the following:

• Input Current Limiting: Always include a current-limiting resistor in series with the input LEDs to prevent damage.
• Output Loading: The phototransistor output requires proper biasing and load resistance for optimal performance.
• PCB Layout: Maintain adequate creepage and clearance distances between input and output circuits.
• Temperature Effects: CTR decreases with increasing temperature - derate accordingly for high-temperature operation.

Ordering Information

The TIL920 series offers several ordering options:

• TIL920 - Single channel, standard CTR (20% min)
• TIL920-50 - Single channel, high CTR (50% min)
• TIL920-100 - Single channel, premium CTR (100% min)
• TIL921 - Dual channel, standard CTR (20% min)
• TIL922 - Quad channel, standard CTR (20% min)

All devices are available in tape-and-reel packaging for automated assembly (add "-T" suffix to part number).

Conclusion

The TIL920 series optocouplers provide reliable, high-performance isolation for AC and DC applications across industrial, medical, and telecommunications markets. With multiple channel options, CTR grades, and robust packaging, these devices offer designers flexible solutions for signal isolation challenges. The combination of GaAs LEDs and silicon phototransistors delivers consistent performance with excellent noise immunity, making the TIL920 series a preferred choice for demanding isolation applications.