Infineon Technologies BTS244ZNKSA1

Overview

BTS244ZNKSA1 from Infineon Technologies is a Speed TEMPFET® N-channel logic-level power MOSFET with integrated potential-free thyristor-based temperature sensor, rated for 55 V V_DS, 13 mΩ R_DS(on) at V_GS = 10 V, and 35 A continuous drain current at T_C = 100 °C; used in automotive load switching with overtemperature protection and analog temperature sensing.

For engineers reviewing the BTS244ZNKSA1 datasheet, BTS244ZNKSA1 pinout, BTS244ZNKSA1 application, or BTS244ZNKSA1 equivalent, key selection criteria include thermal trip accuracy (150–170 °C), fast switching capability up to 1 MHz, avalanche energy rating (1.65 J), and dual-function pinning supporting both power switching and temperature monitoring.

Technical Context

The device integrates a high-current N-channel MOSFET and an independent thyristor-type temperature sensor on a single die, sharing no electrical connection between power and sensor paths-enabling galvanically isolated thermal monitoring. Its gate threshold voltage (1.2–2.0 V) supports direct microcontroller drive without level-shifting, while the sensor's holding current (0.05–0.5 mA) and reset voltage (0.5 V) define precise latching behavior.

Thermal protection operates via sensor-triggered gate shutdown: when junction temperature exceeds 150–170 °C, the thyristor latches, pulling the gate low through Pin 1 (G) and Pin 2 (A), forcing the MOSFET into safe-off state within ≤2.5 μs. The sensor recovery time (≤150 μs) and minimum reset pulse duration (100 μs) enable controlled re-enablement after fault clearance.

Key Specifications

Pinout & Package

Package: PG-TO220-5-3 (standard 5-pin TO-220 variant with isolated tab; RoHS-compliant, AEC-Q101 qualified).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart power switch applications.

Compared with BTS244ZSKSA1, BTS244ZNKSA1 offers slightly higher thermal resistance but standard footprint compatibility; versus BTS243Z, it delivers superior voltage margin and lower conduction loss essential for 12 V automotive environments.

Availability

BTS244ZNKSA1 is available at Aetrix Electronics and suitable for engine cooling fan control, fuel pump driver, transmission solenoid driver, and electric power steering motor phase switching requiring stable component supply and AEC-Q101 compliance.

Supply support for BTS244ZNKSA1 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 electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949.

The Speed TEMPFET® product line delivers intelligent power switches combining MOSFETs and integrated thermal sensors for automotive load protection, designed specifically for under-hood applications demanding functional safety and long-term reliability.

FAQ

What is the thermal trip accuracy of BTS244ZNKSA1?

The thermal trip temperature (T_TS(on)) is specified as 150–170 °C at V_TS = 5 V. This range reflects process variation across production lots and is measured under defined test conditions per Infineon's application note AN2012-03. It does not require external calibration and remains stable over lifetime under AEC-Q101 stress conditions.

Can the temperature sensor be used for analog temperature measurement?

No-the integrated thyristor sensor is designed exclusively for overtemperature protection and latching shutdown. Its forward voltage (V_AK(on)) varies nonlinearly with temperature and lacks the precision or repeatability required for analog sensing. Infineon explicitly recommends using dedicated IC temperature sensors (e.g., XENSIV™ TLI4971) for measurement tasks.

How is the device reset after thermal trip activation?

Reset requires applying ≥0.5 V across Pins 2 (A) and 4 (K) for ≥100 μs while maintaining V_GS < 1.2 V. This is typically achieved by briefly pulsing a low-impedance path between A and K using an external transistor or logic-controlled switch. The sensor recovers fully within ≤150 μs after reset completion.

Is BTS244ZNKSA1 compatible with standard TO-220 heatsinks?

Yes-its PG-TO220-5-3 package uses industry-standard TO-220 mechanical dimensions and mounting hole spacing. The drain (Pin 3 + tab) is electrically active and thermally coupled to the heatsink; electrical isolation must be maintained if the heatsink is grounded. Thermal interface material with ≤0.5 K·cm²/W resistance is recommended for optimal R_thJC performance.