Infineon Technologies BTS7811KDTMA1

Overview

BTS7811KDTMA1 from Infineon Technologies is a quad-channel protected power switch IC integrating two high-side and two low-side vertical DMOS switches in a single P-TO263-15-1 package. It delivers 26 mΩ (HS) / 14 mΩ (LS) R_DS(on), supports 42 A peak current, operates up to 40 V, and features open-load detection, overtemperature shutdown with hysteresis, and PWM capability up to 25 kHz - used for bidirectional DC motor control in automotive body electronics.

For engineers reviewing the BTS7811KDTMA1 datasheet, BTS7811KDTMA1 pinout, BTS7811KDTMA1 application, or BTS7811KDTMA1 equivalent, this page provides verified functional architecture, validated pin-level circuit roles, confirmed thermal and fault-diagnostic behavior, and real-world H-bridge and quad-switch configuration guidance - all derived from Infineon's official Rev. 2.0 datasheet (2006).

Technical Context

The BTS7811KDTMA1 implements a triple-die TrilithIC™ architecture: one double high-side switch (SMART SIPMOS®) and two independent low-side switches (S-FET 2 logic-level), each with isolated drain-source paths and dedicated source pins enabling flexible H-bridge, half-bridge, or discrete switching topologies. All channels feature integrated clamp diodes and ESD-protected TTL/CMOS-compatible inputs.

Protection logic includes dual-mode short-circuit detection (via V_DS monitoring), open-load sensing in OFF-state using external pull-up + transistor gating, and independent status flags (ST1/ST2) with open-drain Zener-clamped outputs. Undervoltage lockout (V_UVON = typ. 5.5 V, V_UVOFF = typ. 4.7 V) ensures controlled startup and brownout recovery.

Key Specifications

Pinout & Package

Package: P-TO263-15-1 - thermally optimized PowerPak with three isolated heat slugs (DHVS, DL1, DL2) for independent power-stage thermal management and reduced PCB copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel protected switch applications.

Compared with BTS716G and BTS724G, the BTS7811KDTMA1 uniquely integrates both high- and low-side switches with shared diagnostics in one package - reducing component count, interconnect complexity, and thermal coupling issues in space-constrained motor modules.

Availability

BTS7811KDTMA1 is available at Aetrix Electronics and suitable for automotive seat control, power window lift, roof sunshade actuation, and trunk lid latch applications requiring stable component supply across extended vehicle lifecycles.

Supply support for BTS7811KDTMA1 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 leadership in silicon-based power stages and system-level protection architectures.

The BTS7811KDTMA1 belongs to Infineon's TrilithIC™ family - designed specifically for high-integration, thermally robust, fault-tolerant DC motor control in automotive body electronics with stringent ASIL-B readiness.

FAQ

What is the maximum continuous current rating for each channel?

The BTS7811KDTMA1 supports 14 A continuous current per high-side channel at T_C = 125 °C and 21 A per low-side channel under the same condition. These values are limited by internal thermal design and R_DS(on) derating - actual usable current depends on PCB copper area, ambient temperature, and airflow. Peak current capability reaches 42 A for short durations (tp < 100 ms).

How does open-load detection work and what external components are required?

Open-load detection operates only when the high-side switch is OFF. It requires an external 5 V pull-up resistor (R_OL) connected to SH1 or SH2 through a transistor (e.g., BCR192W) that disconnects the resistor during ON-state. If the load is disconnected, SHx rises above V_OUT(OL) (~3.5 V), pulling STx low. No detection occurs during active switching.

Can BTS7811KDTMA1 be used in 24 V commercial vehicle applications?

Yes - its 42 V absolute maximum supply voltage and operation up to 150 °C junction temperature make it suitable for 24 V systems. The device withstands load-dump transients per ISO 7637-2 (pulse 5a) when paired with appropriate TVS clamping. Derating curves in the datasheet confirm 10 A continuous operation at T_A = 85 °C in 24 V configurations.

Are ST1 and ST2 pins compatible with 3.3 V microcontrollers?

Yes - ST1 and ST2 are open-drain outputs with integrated Zener clamps rated to 5.4 V. When used with a 3.3 V pull-up resistor (e.g., 4.7 kΩ to 3.3 V), they safely interface with 3.3 V logic. The output sinks current when active (low), and the Zener prevents damage if accidentally pulled to higher voltages during system debug or fault conditions.