Infineon Technologies TLE4925CHAMA3

Overview

TLE4925CHAMA3 from Infineon Technologies is a dynamic differential Hall effect sensor IC designed for precise motion and position detection of ferromagnetic or permanent magnet targets. It features symmetrical switching thresholds, integrated 4.7nF capacitors, open-drain digital output, self-calibrating architecture, and operates from 3 V to 24 V supply across –40 °C to +155 °C junction temperature - deployed in automotive crankshaft and camshaft sensing.

For engineers reviewing the TLE4925CHAMA3 datasheet, TLE4925CHAMA3 pinout, TLE4925CHAMA3 application, or TLE4925CHAMA3 equivalent, key selection criteria include differential Hall sensitivity (ΔB detection), startup-to-running mode transition timing (≤780 ms reset interval), integrated capacitor configuration (PG-SSO-3-9), reverse voltage protection at VS pin, and short-circuit/overtemperature output protection.

Technical Context

The TLE4925CHAMA3 implements a dual-Hall plate architecture with 2.5 mm spacing to measure differential magnetic flux density (ΔB = B₁ − B₂), enabling robust rejection of common-mode fields and mechanical stress-induced piezo effects. Its digital signal processor performs real-time offset cancellation using arithmetic mean tracking of signal peaks during startup, then locks into high-accuracy zero-crossing switching in running mode.

Startup mode triggers output on rising/falling transitions before full calibration; running mode enforces switching strictly at ΔB = 0 via closed-loop DAC-based offset correction. The internal noise-shaping filter, 1.34 MHz oscillator, and clamping circuitry on both VS and Q pins ensure stable operation under EMI-prone automotive environments and supply transients up to ±27.5 V.

Key Specifications

Pinout & Package

Package: PG-SSO-3-9 - surface-mount, module-style package with two integrated 4.7 nF ceramic (X7R) capacitors rated for 100 V, optimized for reduced external component count in automotive sensors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential Hall position sensing applications.

Compared with TLE4924C, TLE4925CHAMA3 delivers superior noise immunity and accuracy via differential sensing and dynamic calibration; versus generic TLE4925C variants, it guarantees factory-traceable PG-SSO-3-9 packaging with integrated capacitors and full automotive qualification.

Availability

TLE4925CHAMA3 is available at Aetrix Electronics and suitable for engine management systems, transmission control units, electric power steering modules, and industrial rotary encoders requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLE4925CHAMA3 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 ICs, and sensor solutions, with global automotive AEC-Q100 qualification leadership.

The TLE4925CHAMA3 belongs to Infineon's TLE49xx family of programmable Hall-effect sensors, engineered specifically for contactless position and speed sensing in harsh automotive environments.

FAQ

What is the function of the integrated 4.7 nF capacitors in the TLE4925CHAMA3 package?

The two integrated 4.7 nF X7R ceramic capacitors serve as supply decoupling and output filtering elements directly within the PG-SSO-3-9 module. They eliminate the need for external capacitors, reduce PCB layout sensitivity to EMI, and stabilize the internal analog supply and open-drain output stage - confirmed in datasheet Figure 2 and Section 2.2.8–2.2.9.

Does TLE4925CHAMA3 require an external bias magnet, and what polarity is supported?

Yes - the device requires an external permanent magnet for back-biasing, with either south or north pole attached to the unmarked rear side of the package. This is mandatory because the differential Hall plates detect only flux *difference*, not absolute field strength; the datasheet explicitly states "magnetic field must be provided by a back biasing permanent magnet" on Page 2.

How does the self-calibration process affect system timing during power-up?

At power-on, the device enters startup mode and outputs immediate transitions without zero-crossing accuracy. Within ≤780 ms, it completes offset calibration using signal peak detection and switches to running mode, where all subsequent switching occurs precisely at ΔB = 0. This transition is deterministic and documented in Figure 3 and Section 2.2.14 (t_reset = 625–970 ms).

Can TLE4925CHAMA3 operate reliably below 1 Hz, and how is low-frequency detection achieved?

Yes - it supports frequencies as low as 1 mHz (0.001 Hz). Detection relies on magnetic signal change exceeding 2×|ΔB_min| within the recalibration window (≤970 ms), not on AC coupling. The datasheet confirms "output will switch … even below 1Hz once per magnetic edge", making it suitable for parking pawl or gear engagement monitoring at standstill.