TCET1108G

Overview

The TCET1108G is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output and is housed in a PDIP-4 package for through-hole mounting. The device provides an isolation voltage of 5000 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 50 mA, and a forward voltage of 1.6 V at a maximum forward current of 60 mA. The current transfer ratio ranges from 130% to 260%. Switching characteristics include a rise time of 3 µs and a fall time of 4.7 µs.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits via an internal LED and phototransistor structure.
• Delivers fast switching performance with specified rise and fall times suitable for digital signal transmission.
• Offers a wide current transfer ratio range to accommodate varying gain requirements in signal coupling applications.

Applications

• General-purpose signal isolation in industrial control systems
• Interface circuits for microcontrollers and logic families
• Power supply feedback loops requiring galvanic separation

Procurement Notes

Verify the specific Current Transfer Ratio (CTR) bin required for your application, as the TCET1108G covers a 130-260% range. Confirm that the PDIP-4 through-hole package aligns with your PCB layout constraints. Ensure the 5000 Vrms isolation rating meets the safety standards of your target equipment. Cross-reference the absolute maximum ratings against your circuit's peak voltage and current conditions to prevent device failure.

Selection Notes

Select this component when a single-channel isolation solution with moderate speed and high CTR variability is needed. Compare against other TCET110x series variants if different CTR bins or packaging options are preferred. Consider the 70 V collector-emitter voltage limit for load compatibility. Evaluate thermal dissipation capabilities within the 265 mW power dissipation limit under operating conditions.

Part Context

This part belongs to the Vishay TCET1100 series of transistor output optocouplers. The series offers various CTR bins to suit different sensitivity requirements while maintaining consistent physical dimensions and electrical interface characteristics. These components are designed for general-purpose isolation tasks where cost-effectiveness and reliability are prioritized over ultra-high speed or specialized automotive qualifications.

Replacement Considerations

Direct substitutes within the same family include TCET1107G (80-160% CTR), TCET1106G (100-300% CTR), and TCET1104G (160-320% CTR). Verify that the alternative CTR range fits your design margins. Other Vishay DIP-4 optocouplers may serve as functional replacements if pinout and isolation ratings match.