Infineon Technologies TCA305 CHIP

Overview

TCA305 from Infineon Technologies is a bipolar monolithic integrated circuit designed as a dedicated inductive proximity switch controller IC. It integrates oscillator, amplitude detector, comparator with hysteresis, and dual complementary open-collector outputs (Q and Q̄), operates from 5–30 V supply, consumes ≤0.9 mA open-loop current, achieves up to 5 kHz switching frequency without external capacitor, and functions without external integrating capacitor-enabling compact metal-detection proximity sensors for industrial automation.

For engineers reviewing the TCA305 datasheet, TCA305 pinout, TCA305 application, or TCA305 equivalent, key selection considerations include its temperature-stable hysteresis, low saturation voltage (≤0.22 V at 50 mA), built-in turn-on delay control, RoHS-compliant PG-DIP-14-1 package, and compatibility with unshielded ferrite-core resonant coils per CENELEC flush-mount standards.

Technical Context

The TCA305 implements a self-oscillating LC tank interface where metal proximity damps oscillation amplitude, triggering output state change via internal comparator with fixed hysteresis (0.4–0.6 V). Its oscillator frequency is adjustable from 15 kHz to 1.5 MHz via external L/C components, and turn-on delay is programmable using an external resistor at Pin 3 (DD).

Unlike general-purpose comparators, the TCA305 embeds temperature-compensated reference generation, maintains constant hysteresis across –25°C to +85°C and supply voltages, and disables outputs below ~4.5 V supply while enabling only after oscillator stabilization at ≥5 V-ensuring reliable cold-start behavior in industrial power rails.

Key Specifications

Pinout & Package

Package: PG-DIP-14-1 (14-pin plastic dual in-line package, through-hole mount, 0.3 inch width).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inductive proximity switch controller applications.

Compared with TLV3012IDBVR and MAX44267ASA+, the TCA305 delivers a complete, single-chip inductive proximity solution - integrating oscillator, amplitude detection, hysteresis, and dual outputs - whereas alternatives require extensive external circuitry and lack temperature-stable switching thresholds essential for industrial reliability.

Availability

TCA305 is available at Aetrix Electronics and suitable for factory floor proximity sensing, machine tool position detection, and automated packaging line end-of-stroke applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for TCA305 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, industrial, and sensor solutions, with leadership in high-reliability analog and mixed-signal ICs.

The TCA305 belongs to Infineon's legacy Semiconductor Group proximity controller product line, engineered specifically for robust, low-cost inductive sensor designs in harsh industrial environments - emphasizing temperature stability, noise immunity, and minimal external component count.

FAQ

Can the TCA305 operate below 5 V?

Yes - the TCA305 can operate down to approximately 2.5 V if the VREF pin is externally connected to VS. In this mode, the internal reference is no longer regulated, and the turn-on delay pin (DD) must be tied to VS. Performance parameters such as hysteresis and oscillator stability may shift slightly, but functional operation is maintained per Infineon's application note AN2005-07.

What is the purpose of the NC pin (Pin 14)?

Pin 14 is a true no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected in layout and assembly. Leaving it floating or grounding it has no effect on operation, but soldering or routing to it may risk mechanical stress or unintended coupling in high-density boards.

How does the TCA305 achieve temperature-stable hysteresis?

The TCA305 uses matched transistor pairs and curvature-compensated bandgap references to generate hysteresis that tracks supply and temperature variations. Unlike resistor-based hysteresis networks, its internal feedback structure maintains 0.4–0.6 V hysteresis across –25°C to +85°C and 5–30 V supply, eliminating calibration drift in field-deployed sensors.

Is the TCA305 still recommended for new designs?

No - Infineon marks the TCA305 as "Not for new design" (as noted in Semiconductor Group 1 documentation). While fully supported for existing production and repair, new projects should consider modern alternatives like the TLE4961-2K or BGT60TR13D, which offer improved ESD rating, wider temperature range, and integrated diagnostics - though they require redesign due to different pinouts and feature sets.