TIL923 Optocoupler Technical Summary

Overview

The TIL923 is a high-performance optocoupler designed to provide electrical isolation between input and output circuits. It consists of a gallium-arsenide (GaAs) light-emitting diode (LED) optically coupled to a silicon n-p-n Darlington phototransistor. This configuration ensures reliable signal transmission while maintaining galvanic isolation, making it suitable for applications requiring noise immunity and voltage separation.

The TIL923 is part of a family of optocouplers that includes single-channel (TIL923), dual-channel (TIL924), and quad-channel (TIL925) variants, available in 4-pin, 8-pin, and 16-pin packages, respectively. The standard devices are tested for a minimum current-transfer ratio (CTR) of 500%, ensuring robust performance in demanding environments.

Features

• High Current-Transfer Ratio (CTR): Minimum 500% ensures reliable signal transmission.
• Darlington Phototransistor Output: Provides high gain for improved sensitivity.
• Gallium-Arsenide LED: Offers high efficiency and long-term reliability.
• Electrical Isolation: Withstands high voltage between input and output (typically 2500V_rms).
• Wide Operating Temperature Range: Suitable for industrial and automotive applications.
• Multiple Channel Options: Available in single (TIL923), dual (TIL924), and quad (TIL925) configurations.
• Compact Package: 4-pin DIP (Dual In-line Package) for space-constrained designs.

Applications

The TIL923 optocoupler is widely used in applications requiring electrical isolation, noise immunity, and signal conditioning. Key application areas include:

• Industrial Control Systems: Isolate PLCs, motor drives, and sensors from high-voltage circuits.
• Power Supply Feedback: Provide isolated feedback in switch-mode power supplies (SMPS).
• Medical Equipment: Ensure patient safety by isolating sensitive circuits from high voltages.
• Telecommunications: Protect low-voltage logic circuits from high-voltage transients.
• Automotive Electronics: Isolate communication buses (e.g., CAN, LIN) in vehicle systems.
• Consumer Electronics: Used in appliances requiring isolation for safety and noise reduction.

Electrical Characteristics

Absolute Maximum Ratings

• Input Forward Current (I_F): 60 mA (continuous), 1 A (peak)
• Reverse Voltage (V_R): 6 V
• Output Collector-Emitter Voltage (V_CEO): 30 V
• Output Emitter-Collector Voltage (V_ECO): 7 V
• Total Power Dissipation (P_tot): 150 mW
• Isolation Voltage (V_ISO): 2500 V_rms
• Operating Temperature Range (T_op): -55°C to +100°C
• Storage Temperature Range (T_stg): -55°C to +125°C

Recommended Operating Conditions

• Input Forward Current (I_F): 10 mA to 20 mA
• Output Collector Current (I_C): Up to 50 mA
• Ambient Temperature (T_A): -40°C to +85°C

Optical Characteristics

• Current-Transfer Ratio (CTR): 500% minimum at I_F = 10 mA, V_CE = 5 V
• Response Time (t_r, t_f): 15 µs (rise), 50 µs (fall)
• Isolation Resistance (R_ISO): 10¹² Ω minimum

Package Information

4-Pin DIP Package Dimensions

• Package Type: Dual In-line Package (DIP-4)
• Body Width: 6.35 mm (0.25 in)
• Body Length: 9.65 mm (0.38 in)
• Lead Pitch: 2.54 mm (0.1 in)
• Mounting Style: Through-hole
• Material: Molded plastic, UL94 V-0 flammability rating

Pin Configuration

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

Reliability and Compliance

The TIL923 optocoupler is designed to meet stringent reliability and safety standards, including:

• UL Recognition: Certified under UL 1577 for reinforced insulation.
• IEC/EN Certification: Complies with IEC 60747-5-5 and EN 60747-5-5 for optoelectronic devices.
• RoHS Compliance: Free from hazardous substances per Directive 2011/65/EU.

Conclusion

The TIL923 optocoupler is a robust and reliable solution for applications requiring electrical isolation and signal transmission. Its high current-transfer ratio, Darlington output, and wide operating temperature range make it suitable for industrial, automotive, and medical applications. With multiple channel options and compliance with international safety standards, the TIL923 family offers flexibility and peace of mind for designers.