Infineon Technologies TLE42644GHTSA3

Overview

TLE42644GHTSA3 from Infineon Technologies is a monolithic low-dropout linear voltage regulator delivering a fixed 5 V output with ±2% accuracy up to 50 mA and ±3% up to 100 mA, featuring 40 µA typical quiescent current, reverse polarity protection, and overtemperature shutdown. It operates across -40°C to +150°C and supports input voltages from 5.5 V to 40 V, designed for permanent-battery-connected automotive subsystems such as body control modules and sensor interfaces.

For engineers reviewing the TLE42644GHTSA3 datasheet, TLE42644GHTSA3 pinout, TLE42644GHTSA3 application, or TLE42644GHTSA3 equivalent, key selection criteria include dropout voltage ≤500 mV at 100 mA, AEC-Q100 qualification, thermal resistance R_thJA = 54 K/W (FR4 2s2p), PG-SOT223-4 package compatibility, and 150–500 mA current limiting behavior under overload.

Technical Context

The TLE42644GHTSA3 integrates bandgap reference, error amplifier, saturation control, and thermal shutdown circuitry in a single die. Its architecture enables stable regulation with ceramic output capacitors ≥10 µF and ESR ≤2 Ω at 10 kHz, while internal current limiting activates when V_Q drops 100 mV below nominal.

Protection functions include reverse-polarity tolerance down to -30 V, short-circuit robustness via foldback current limiting, and overtemperature shutdown at 151–200°C with 25°C hysteresis. The device maintains regulation up to 45 V input but specifies functional operation between 5.5 V and 40 V.

Key Specifications

Pinout & Package

Package: PG-SOT223-4 - thermally enhanced surface-mount package with exposed heat slug internally connected to GND, requiring PCB copper pour for heatsinking and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current automotive LDO applications.

Compared with TLV73350PDBVR, TLE42644GHTSA3 delivers guaranteed automotive reliability and reverse-voltage resilience; versus TLE42744G, it trades 300 mA headroom for 15 µA lower quiescent current-critical for long-term battery hold-up in always-on nodes.

Availability

TLE42644GHTSA3 is available at Aetrix Electronics and suitable for body control modules, occupant detection systems, engine sensor interfaces, and LED lighting bias supplies requiring stable component supply across automotive production lifecycles.

Supply support for TLE42644GHTSA3 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 AEC-Q100 validation infrastructure.

The OPTIREG™ linear product line delivers AEC-Q100-qualified voltage regulators optimized for harsh automotive environments-designed specifically for permanent-battery-supplied ECUs needing ultra-low I_q, wide temperature operation, and integrated fault protection.

FAQ

What is the maximum input voltage the TLE42644GHTSA3 can withstand continuously?

The TLE42644GHTSA3 is rated for continuous operation up to 40 V input (functional range), with an absolute maximum rating of 45 V. Operation above 40 V is not recommended for sustained periods, as regulation accuracy and thermal stress increase significantly beyond this point. Transient spikes up to 45 V are tolerated per ISO 7637-2 Pulse 5a specifications.

Does the TLE42644GHTSA3 require an external output capacitor, and what type is recommended?

Yes, a minimum 10 µF ceramic capacitor with ESR ≤2 Ω at 10 kHz is required on the Q pin for stability. Tantalum or aluminum electrolytic capacitors are not recommended due to higher ESR and aging effects. The capacitor must be placed within 5 mm of the IC pins, with low-inductance layout to maintain PSRR and transient response.

How does the overtemperature shutdown behave during repeated fault events?

Overtemperature shutdown activates at 151–200°C junction temperature and latches off until T_j falls by ≥25°C (hysteresis). During repeated short-circuit faults, the device cycles on/off with thermal time constants dictated by PCB copper area and airflow-no permanent disable occurs, but sustained cycling may indicate inadequate heatsinking or excessive ambient temperature.

Is the TLE42644GHTSA3 pin-compatible with legacy TLE4264 series regulators?

Yes, the TLE42644GHTSA3 uses the same PG-SOT223-4 package and pinout as TLE4264-2G and TLE4264G, making it a direct 1-to-1 replacement. All four pins (I, GND, Q, Heat slug) retain identical functions and electrical characteristics, except for reduced quiescent current (40 µA vs. 60–80 µA in predecessors).