TCA305 CHIP

Overview

The Infineon TCA305 is a bipolar integrated circuit designed for inductive proximity switch applications. It integrates all necessary functions to detect standard metal plates by damping a resonant circuit. Key electrical parameters include an open-loop current consumption of less than 1 mA, a supply voltage range of 5 V to 30 V, and an operating temperature range from -25 °C to 85 °C. The device features a threshold at pin 3 of 2.1 V and a hysteresis of 0.5 V. Outputs are disabled below approximately 4.5 V and enabled upon oscillator stabilization. The switching frequency without an integrating capacitor reaches 5 kHz.

Feature Summary

• Lower open-loop current consumption and output saturation voltage
• Reduced temperature dependence of switching distance with easier resonant circuit compensation
• Higher sensitivity enabling larger switching distances and use of lower quality coils
• Constant switching hysteresis regardless of temperature, supply voltage, or switching distance
• Temporary short-circuit proof outputs and noise immunity via external RC combinations

Applications

• Inductive proximity switches
• Metal plate detection systems
• Resonant circuit damping applications

Procurement Notes

Verify the specific package type required, as the TCA305 is available in PG-DIP-14-1 (TCA 305 A) and PG-DSO-14-1 (TCA 305 G). Confirm ordering codes Q67000-A2291 and Q67000-A2305 match project needs. Note that this component is marked 'Not for new design'; evaluate legacy support requirements before procurement.

Selection Notes

Select the TCA305 over the TCA355 when external integrating capacitors are preferred or when specific DIP/SMD packaging constraints apply. Ensure the application operates within the 5 V to 30 V supply range. Consider the TCA305's ability to function without an external capacitor if board space is limited, though adding one improves noise immunity.

Part Context

The TCA305 was developed from the TCA205 type. It shares functional similarities with the TCA355 but differs in packaging and specific parameter limits. Both devices serve as complete solutions for designing inductive proximity switches using standard metal plates and coil resonant circuits.

Replacement Considerations

The TCA305 is explicitly marked 'Not for new design'. No direct public substitute part numbers are listed in the provided documentation. Designers should consider newer generations of proximity switch ICs for new projects.