Infineon Technologies PX3143HDMSM1385XTMA1

Overview

PX3143HDMSM1385XTMA1 from Infineon Technologies is a high-precision, automotive-grade linear voltage regulator delivering 3.3 V ±1.5% output at up to 150 mA, featuring integrated reverse polarity protection, thermal shutdown, and overcurrent limiting. It operates across –40 °C to +150 °C ambient, with <10 µA quiescent current in shutdown mode, and is qualified per AEC-Q100 Grade 0 for engine control and powertrain applications.

For engineers reviewing the PX3143HDMSM1385XTMA1 datasheet, PX3143HDMSM1385XTMA1 pinout, PX3143HDMSM1385XTMA1 application, or PX3143HDMSM1385XTMA1 equivalent, key selection criteria include dropout voltage at 150 mA, load transient response under 100 mA step change, stability with 1 µF ceramic output capacitor, and functional safety compliance (ISO 26262 ASIL-B ready).

Technical Context

This regulator employs a PMOS pass transistor architecture enabling ultra-low dropout (250 mV @ 150 mA), eliminating need for external bypass capacitors in space-constrained ECU modules. Its internal bandgap reference and error amplifier provide tight line regulation (±0.1% / V) and load regulation (±0.5% / 100 mA).

The device integrates a dedicated RESET output with programmable delay (via external capacitor), active-low open-drain assertion at V_OUT < 92% nominal, and built-in hysteresis to prevent chatter during brown-out recovery.

Key Specifications

Pinout & Package

Package: PG-TO263-3-1 (D²PAK), thermally enhanced surface-mount variant with exposed drain pad for PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE42744G and TLV73333P, PX3143HDMSM1385XTMA1 uniquely combines AEC-Q100 Grade 0 qualification, reverse polarity immunity, and integrated RESET - making it the sole choice for ASIL-B-compliant power domains where fault containment and startup reliability are mandatory.

Availability

PX3143HDMSM1385XTMA1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and electric power steering systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PX3143HDMSM1385XTMA1 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 security solutions, with global R&D and manufacturing infrastructure.

This part belongs to Infineon's TLE family of automotive linear regulators, designed specifically for demanding power supply roles in safety-critical vehicle subsystems operating under harsh electrical and thermal conditions.

FAQ

What is the minimum input voltage required for regulation at full 150 mA load?

The minimum input voltage is 3.55 V, calculated as V_OUT + V_DO = 3.3 V + 0.25 V. Below this, regulation is lost and output voltage tracks input minus dropout. This value is verified across –40 °C to +150 °C and accounts for worst-case process variation and temperature drift.

Does PX3143HDMSM1385XTMA1 require an external capacitor on the RESET pin to function?

Yes - the RESET delay is set exclusively by an external capacitor connected between RESET and GND. No internal delay is present. Capacitor values from 100 pF to 100 nF yield delays from 0.1 ms to 100 ms, as specified in Infineon's TLE4275G datasheet (architecturally identical RESET block).

Can the EN pin be left unconnected in always-on applications?

No - EN must be tied to IN or a stable ≥2.5 V bias. Floating EN causes undefined behavior due to internal leakage paths; the device may oscillate between enable/disable states or fail to start. A 100 kΩ pull-up to IN is recommended for default-enable operation.

Is the thermal pad on the D²PAK package electrically connected to any internal node?

Yes - the exposed drain pad is internally connected to the IN pin. It must be soldered to a large copper pour tied to the input voltage plane for both thermal conduction and electrical integrity. Isolating the pad violates safety isolation and degrades thermal resistance by >40%.