TDA0161DP Proximity Detector IC for Metal Detection

TDA0161DP Proximity Detector IC for Metal Detection

The TDA0161DP is a monolithic integrated circuit designed specifically for proximity detection and metal sensing applications. It operates by detecting variations in the oscillation amplitude caused by the presence of metallic objects near a sensing coil. The TDA0161 provides a simple, compact, and reliable solution for building non-contact metal detection systems, such as industrial sensors, object counters, and security equipment.

Manufactured by STMicroelectronics, this IC combines oscillator control, demodulation, and output switching circuitry into a single package, minimizing external components and simplifying circuit design.

The TDA0161DP works by controlling an oscillator circuit whose frequency and amplitude depend on an external inductor-capacitor (LC) network.

• When a metal object approaches the coil, eddy currents are induced in the metal.
• These eddy currents cause energy loss in the oscillator circuit, leading to a reduction in amplitude.
• The IC senses this change, demodulates the signal, and drives the output transistor accordingly.

This allows the TDA0161DP to effectively act as a metal proximity switch — changing its output state when metal is detected near the sensing coil.

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Features:-

• 10mA Output Current
• Oscillator Frequency 10MHz
• Supply Voltage +4 to +35V

Specification:-