TCDT1122G

Overview

The TCDT1122G is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It integrates an NPN phototransistor with a gallium arsenide infrared emitting diode in a 6-lead PDIP package. Key electrical parameters include a maximum collector-emitter voltage of 32 V, a collector current rating of 50 mA, and an isolation voltage of 5000 Vrms. The device features a current transfer ratio ranging from 63% to 125%, with a forward current limit of 60 mA and a power dissipation capacity of 200 mW. Operating temperatures span from -55°C to +100°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Integrates a gallium arsenide infrared LED with an NPN phototransistor
• Designed for through-hole mounting in standard 6-pin DIP packages

Applications

• Switch-mode power supplies
• Line receiver circuits
• Computer peripheral interfaces
• Microprocessor system interfaces

Procurement Notes

Verify the specific suffix 'G' indicates RoHS compliance status as per manufacturer documentation. Confirm that the PDIP-6 package matches the required PCB footprint and thermal constraints. Ensure the 5000 Vrms isolation rating meets the safety standards of the target application environment. Cross-reference the CTR range (63%-125%) against circuit design requirements for signal integrity.

Selection Notes

Select this component when a robust, general-purpose optoisolator is required for digital signal transmission. The 63% minimum CTR ensures reliable switching at low drive currents. The wide operating temperature range supports industrial environments. Consider the 7 us rise time for applications requiring moderate speed isolation rather than high-frequency data links.

Part Context

This part belongs to the TCDT1120 series, which includes variants like TCDT1120 and TCDT1120G. These devices are designed for general-purpose isolation tasks. The series maintains consistent pinout and mechanical dimensions across variants, differing primarily in electrical tolerances or compliance markings.

Replacement Considerations

Direct substitutes within the same Vishay family include TCDT1120 and TCDT1120G. Verify that alternative manufacturers' parts match the 6-DIP form factor and 5000 Vrms isolation rating. Ensure replacement components maintain similar CTR specifications to avoid redesigning bias networks.