Infineon Technologies TLE42744DV33ATMA1

Overview

TLE42744DV33ATMA1 from Infineon Technologies is a monolithic low-dropout linear voltage regulator delivering 3.3 V ±2% at up to 400 mA output current, with input voltage range 4.7–40 V and dropout voltage as low as 250 mV at 400 mA. It features reverse polarity protection, overtemperature shutdown, and current limiting, and is AEC-Q100 qualified for automotive body control modules, infotainment power rails, and engine management sensors.

For engineers reviewing the TLE42744DV33ATMA1 datasheet, TLE42744DV33ATMA1 pinout, TLE42744DV33ATMA1 application, or TLE42744DV33ATMA1 equivalent, key selection criteria include its PG-TO252-3 thermal performance (R_thJC = 3.6 K/W), 150 °C junction rating, ±2% output accuracy, and suitability for always-on battery-connected systems requiring <100 µA quiescent current.

Technical Context

The TLE42744DV33ATMA1 integrates a bandgap reference, error amplifier, and saturation-controlled pass transistor in a single silicon die. Its protection circuitry includes thermal foldback and current-limit hysteresis triggered by internal temperature sensing and output current monitoring.

It operates across -40 °C to +150 °C ambient, supports ceramic output capacitors ≥22 µF with ESR ≤3 Ω, and maintains regulation under transient load steps up to 400 mA with <100 µs response time per functional specification.

Key Specifications

Pinout & Package

Package: PG-TO252-3 (TO-252AA), thermally enhanced with exposed GND-connected heat slug on underside.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TLV73333PDBVR and TPS7B8733QKVURQ1, the TLE42744DV33ATMA1 offers superior thermal robustness in TO252, integrated reverse-polarity hardening, and proven fault recovery behavior in harsh automotive transients-making it optimal for under-hood and safety-critical domains where reliability outweighs feature count.

Availability

TLE42744DV33ATMA1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, and engine control unit sensor interfaces requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for TLE42744DV33ATMA1 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 industrial control solutions, with global manufacturing and qualification infrastructure.

The TLE42744 belongs to Infineon's automotive linear regulator product line, engineered specifically for high-reliability, high-temperature power conditioning in engine bay and chassis-mounted electronic control units.

FAQ

What is the minimum input voltage required for regulation at full 400 mA load?

The TLE42744DV33ATMA1 maintains regulation down to 4.7 V input across its full operating temperature range. At 400 mA load and 150 °C junction temperature, the dropout voltage rises to 350 mV, requiring ≥3.65 V input to sustain 3.3 V output - well within the specified 4.7 V minimum for functional operation.

Can this device replace a 5 V variant like TLE42744DV50 in an existing design?

No - the TLE42744DV33ATMA1 is internally trimmed to 3.3 V ±2% and cannot be adjusted. Replacing a 5 V regulator requires verifying downstream IC voltage tolerances, revalidating power sequencing, and confirming that all connected logic and interfaces operate reliably at 3.3 V instead of 5 V.

Is an external output capacitor mandatory, and what type is recommended?

Yes - a minimum 22 µF ceramic capacitor with ESR ≤3 Ω at 10 kHz is mandatory for stability and transient response. Tantalum or aluminum electrolytic capacitors are not recommended due to higher ESR and aging effects that may cause oscillation or poor load-step recovery.

How does the heat slug connection affect thermal performance and electrical functionality?

The heat slug is electrically tied to GND and thermally coupled to the die. Soldering it to a ≥300 mm² PCB copper pour reduces R_thJA from 115 K/W (no heatsink) to 52 K/W, directly lowering junction temperature by up to 45 °C at 400 mA. An unconnected or floating slug compromises both thermal safety and ground integrity.