Infineon Technologies TCA355GGEGHUMA1

Overview

TCA355GGEGHUMA1 from Infineon Technologies is a bipolar monolithic inductive proximity switch IC designed for metal detection without mechanical contact. It integrates oscillator, amplitude detector, hysteresis comparator, and push-pull output stages in a single PG-DSO-8-1 package. Key confirmed parameters: supply voltage range 5–30 V, open-loop current < 0.9 mA, output saturation voltage ≤ 0.22 V at 50 mA, switching frequency up to 1.5 MHz, and operating ambient temperature –25 °C to +85 °C. It enables flush-mounted industrial sensors for factory automation.

For engineers reviewing the TCA355GGEGHUMA1 datasheet, TCA355GGEGHUMA1 pinout, TCA355GGEGHUMA1 application, or TCA355GGEGHUMA1 equivalent, key selection criteria include turn-on delay configurability via external resistor, integrated hysteresis stability over temperature and supply voltage, absence of required external integrating capacitor (unlike TCA305), and short-circuit proof outputs rated for ≥10 s.

Technical Context

The TCA355GGEGHUMA1 implements a self-oscillating LC resonant circuit interface where metal proximity damps oscillation amplitude, triggering a comparator with fixed hysteresis. Its oscillator operates from 15 kHz to 1.5 MHz, adjustable via external L/C components, and features internal reference voltage stabilization only when VS ≥ 5 V.

Unlike the TCA305, the TCA355 omits the dedicated turn-on delay capacitor pin (pin 3) and does not require an external integrating capacitor for basic operation - simplifying PCB layout while retaining noise immunity via optional RC filtering at the amplitude detection node.

Key Specifications

Pinout & Package

Package: PG-DSO-8-1 (8-pin plastic dual small-outline, surface-mount, 150 mil width, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA355GGEGHUMA1, the TCA305G adds design flexibility at the cost of component count and power, while the TLV3012IDBVR shifts full responsibility for oscillator stability, output drive, and fault tolerance to the system designer - increasing validation effort but enabling niche optimizations.

Availability

TCA355GGEGHUMA1 is available at Aetrix Electronics and suitable for industrial automation, factory safety systems, and conveyor monitoring requiring stable component supply and long-lifecycle support.

Supply support for TCA355GGEGHUMA1 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, sensor ICs, and automotive electronics, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The TCA series belongs to Infineon's Industrial Sensing portfolio, engineered specifically for robust, maintenance-free inductive position and proximity detection in harsh factory environments - prioritizing thermal stability, EMC resilience, and long-term calibration retention.

FAQ

Can TCA355GGEGHUMA1 operate below 5 V?

Yes - but only with V_REF externally tied to V_S, disabling internal reference regulation. In this mode, comparator thresholds track supply voltage, requiring recalibration of R_Di and R_Hy. Output drive strength and oscillator frequency remain functional, though noise margin decreases.

What is the purpose of the R_Hy and R_Di pins?

R_Hy sets hysteresis width by defining the amplitude difference between turn-on and turn-off thresholds; R_Di adjusts the absolute amplitude threshold for nominal switching distance. Both are voltage-divider nodes referenced to internal comparators - values directly scale detection sensitivity and repeatability.

Does TCA355GGEGHUMA1 require an external coil capacitor?

Yes - an external resonant capacitor (C₀) is mandatory and forms the LC tank with the sensing coil (L₀). Typical values range from 100 pF to 3.3 nF depending on coil inductance and target frequency. No integrating capacitor is needed, unlike the TCA305.

How is thermal performance affected by the PG-DSO-8-1 package?

The PG-DSO-8-1 package has a junction-to-air thermal resistance (R_th,SA) of 140 K/W. At 50 mA output load and 30 V supply, power dissipation reaches ~300 mW - resulting in ~42 °C junction rise above ambient. Layout with thermal pad soldering and copper pour is essential for reliable operation at max ratings.