XENSIV TLE4973 from Infineon Technologies AG - precise current sensing for electric drives

The XENSIV TLE4973 enables contactless, precise current measurement for compact inverter designs in electric vehicles and industrial drives. This bestseller keeps the price of Infineon Technologies shares (ISIN DE0006231004) firmly in focus for many investors.

Reviewed: ad hoc news Accessory & Components desk. Edited and checked on 2026-06-24, 02:09. Details in the imprint.

The XENSIV TLE4973 sits like a small black pebble on the inverter board, watching every amp that flows through the copper busbar without ever touching it. When test engineer Markus Keller snaps the module into place, he feels the solid click of the housing locking against the laminated busbar and hears the quiet hum of the lab motor ramping up.

What the TLE4973 does

Infineon Technologies AG positions the XENSIV TLE4973 as a core current sensor for traction inverters and industrial drives, measuring up to several hundred amps without a shunt or cooling block. Its core idea is simple: a magnetic core around the busbar guides the field to a Hall sensor inside the package, so the electronics can read load current without direct electrical contact.

Compared with traditional shunt resistors, the TLE4973 cuts power loss and reduces heat, which is critical near power modules in tight EV inverter housings. The sensor sits on top of the laminated busbar, so designers gain galvanic isolation and can keep high-voltage paths short while still monitoring each phase.

Specs in everyday design work

In a typical three-phase traction inverter, the XENSIV TLE4973 monitors current for closed-loop control, overcurrent protection and torque estimation. Engineers appreciate that it delivers a digital output with integrated signal conditioning, so the microcontroller sees a clean, temperature-compensated current value instead of a noisy analog voltage.

Infineon describes accuracy in the single-digit percent range over temperature with low offset drift, enough for precise field-oriented control and efficiency optimization in permanent-magnet motors. The device is usually powered from a standard 5-volt rail, which simplifies integration into existing gate-driver boards and control PCBs.

How it feels in real hardware

When you hold the XENSIV TLE4973 in your hand, it feels compact and tidy, with a clear mechanical guide for the busbar window. During installation on a prototype EV inverter, the sensor lines up cleanly with the laminated copper stack, so a technician can slide the busbar through the aperture without forcing it.

Once the inverter cover closes, the only reminder of the sensor’s presence is the clean, sharply defined current trace on the oscilloscope. Instead of a noisy sawtooth from a hot shunt, engineers see a smooth current waveform that matches the motor’s sound as it spins through a test cycle.

Strengths and trade-offs

The big strength of the TLE4973 is its ability to combine galvanic isolation, low loss and compact integration. For high-current designs, shunt resistors demand extra cooling and clearance, while current transformers struggle with DC and slow transients. A contactless sensor around the busbar cuts these constraints and leaves more room for power modules and cooling channels.

The trade-off is that designers must commit to a specific mechanical window and core design, which locks in busbar geometry early in the project. If routing changes or phase order shifts late, the mechanical integration around the TLE4973 can become a puzzle, especially in cramped inverter housings.

Who buys and integrates it

Infineon mainly sells the XENSIV TLE4973 into tier-one suppliers that build complete inverter and e-axle systems for carmakers, but industrial drive manufacturers also pick it up for compact servo drives and general-purpose inverters. For them, the mix of isolation and low loss helps meet efficiency and safety targets without bigger housings.

Product manager Dr. Sabine Huber describes the sensor family as a “quiet enabler” of higher power density, because it lets power-module designers stack phases closer together while still giving the control unit precise eyes on each current path. Her point shows up in datasheets: leakage paths and creepage distances stay manageable when sensing is magnetic instead of resistive.

Market context and stock reference

All told, the XENSIV TLE4973 underlines how Infineon is trying to deepen its position in the value chain of electric mobility and industrial automation by shipping not just power semiconductors but also sensing and control components that make those systems efficient and robust. Infineon Technologies shares (ISIN DE0006231004) are listed on Xetra; current prices in euros are available from German exchange data providers.

Key facts on the XENSIV TLE4973

• Product: XENSIV TLE4973 current sensor
• Manufacturer: Infineon Technologies AG
• Category: Accessory / components for power electronics
• Launch: Recently introduced as part of Infineon’s XENSIV current sensor portfolio for traction inverters and industrial drives
• RRP / Price: Typically negotiated in OEM volumes, unit prices vary by contract and order size
• Availability: Available directly from Infineon and through specialist distributors for automotive and industrial electronics, mainly for design-in rather than retail sale
• Target group: Automotive tier-one suppliers, inverter and motor-drive manufacturers, engineers designing high-current systems with isolation requirements
• Highlight / USP: Contactless, low-loss current measurement on laminated busbars with integrated signal conditioning and galvanic isolation in a compact package

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.