TIL917 Optocoupler Technical Summary

Overview

The TIL917 is a single-channel optocoupler consisting of a gallium-arsenide (GaAs) light-emitting diode (LED) optically coupled to a silicon n-p-n Darlington phototransistor. This device is designed to provide electrical isolation between input and output circuits while transmitting signals across the isolation barrier. The TIL917 is part of a family that includes the dual-channel TIL918 (8-pin package) and quad-channel TIL919 (16-pin package).

Standard versions are tested for a minimum current-transfer ratio (CTR) of 20%, with higher-performance variants available (TIL917A: 50% CTR, TIL917B: 100% CTR, TIL917C: 200% CTR). The device is housed in a compact 4-pin package suitable for through-hole mounting.

Features

• Single-channel optocoupler with GaAs LED and Darlington phototransistor
• High current-transfer ratio options available (20% to 200% minimum)
• Electrical isolation between input and output circuits
• Darlington output configuration provides high sensitivity
• Compact 4-pin DIP package
• Reliable performance across temperature ranges
• Compatible with standard PCB assembly processes

Applications

The TIL917 optocoupler is suitable for a wide range of applications requiring signal isolation:

• Industrial control systems
• Power supply feedback circuits
• Microprocessor system interfaces
• Medical equipment isolation
• Telecommunication systems
• Ground loop elimination
• Noise immunity in signal transmission
• High-voltage sensing with low-voltage control

Electrical Characteristics

Absolute Maximum Ratings

• LED Forward Current: 60 mA (continuous)
• LED Reverse Voltage: 3 V
• Collector-Emitter Voltage: 30 V
• Emitter-Collector Voltage: 7 V
• Collector Current: 150 mA
• Total Power Dissipation: 250 mW
• Operating Temperature Range: -55°C to +100°C
• Storage Temperature Range: -55°C to +125°C

Typical Performance Characteristics

• Current Transfer Ratio (CTR):
  • Standard: 20% minimum
  • A version: 50% minimum
  • B version: 100% minimum
  • C version: 200% minimum
• LED Forward Voltage: 1.15 V typical at 10 mA
• Collector-Emitter Saturation Voltage: 0.4 V typical at IC = 4 mA, IF = 1 mA
• Response Time (Turn-on): 15 μs typical
• Response Time (Turn-off): 100 μs typical
• Isolation Voltage: 2500 Vrms minimum

Package Information

Mechanical Specifications

• Package Type: 4-pin DIP (Dual In-line Package)
• Overall Dimensions:
  • Length: 10.2 mm (0.400 inches)
  • Width: 6.35 mm (0.250 inches)
  • Height: 5.08 mm (0.200 inches) maximum
• Pin Spacing: 2.54 mm (0.100 inches) between pins
• Row Spacing: 7.62 mm (0.300 inches) typical
• Lead Length: 3.81 mm (0.150 inches) minimum
• Seating Plane: 1.27 mm (0.050 inches) from bottom

Pin Configuration

• Pin 1: Anode of LED
• Pin 2: Cathode of LED
• Pin 3: Emitter of Phototransistor
• Pin 4: Collector of Phototransistor

Packaging Options

• Standard packaging: Tube
• Alternative packaging: Tape and reel (available for high-volume orders)
• Quantity per package: Typically 50 units per tube

Reliability and Compliance

• Manufactured under strict quality control standards
• RoHS compliant versions available
• UL recognized component (file E69938)
• Meets or exceeds relevant industry standards for optoelectronic devices

Design Considerations

When implementing the TIL917 in circuit designs, consider the following:

• LED current limiting is required - typical operation at 10-20 mA
• Darlington configuration results in higher saturation voltage than single transistors
• Response time may limit high-frequency applications
• CTR degrades over time - design with appropriate margin
• Keep traces short for noise-sensitive applications
• Provide adequate creepage and clearance distances for high-voltage isolation

Ordering Information

• TIL917: Standard version (20% CTR minimum)
• TIL917A: 50% CTR minimum version
• TIL917B: 100% CTR minimum version
• TIL917C: 200% CTR minimum version

Contact factory for availability of RoHS compliant versions and alternative packaging options.