Infineon Technologies TLE4274GSV33HTSA2

Overview

TLE4274GSV33HTSA2 from Infineon Technologies is a 3.3 V ±4% fixed-output linear voltage regulator in PG-SOT223-4 package, delivering up to 400 mA output current with input voltage range 4.7–40 V. It features short-circuit and reverse-polarity protection, thermal shutdown, and AEC-Q100 qualification for automotive power rails.

For engineers reviewing the TLE4274GSV33HTSA2 datasheet, TLE4274GSV33HTSA2 pinout, TLE4274GSV33HTSA2 application, or TLE4274GSV33HTSA2 equivalent, key selection criteria include dropout voltage (0.7–1.2 V at 300 mA), quiescent current (8–30 µA to 30 mA depending on load), ESR-stable operation with ≥10 µF/≤2.5 Ω output capacitor, and junction temperature range of –40 °C to +150 °C.

Technical Context

The TLE4274GSV33HTSA2 uses a bandgap reference and control amplifier to regulate output voltage by driving a series pass transistor, with saturation control preventing oversaturation under high load. Internal protection circuits monitor temperature, overload, and reverse polarity conditions.

It operates as a low-dropout linear regulator with fixed 3.3 V output, requiring no external feedback network. Input stability relies on a 100 nF ceramic capacitor at Pin 1, while output stability requires ≥10 µF tantalum or aluminum electrolytic capacitor with ESR ≤2.5 Ω.

Key Specifications

Pinout & Package

PG-SOT223-4 package: thermally enhanced 4-pin surface-mount package with exposed thermal pad (Pin 4 connected to GND). Pin 2 and Pin 4 are internally tied to GND and heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PDBVR, TLE4274GSV33HTSA2 offers superior fault resilience (reverse polarity, short-circuit) at higher current; versus NCV4274AST33T3G, it trades thermal efficiency for smaller SOT223 footprint and identical automotive qualification.

Availability

TLE4274GSV33HTSA2 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and radar sensor subsystems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for TLE4274GSV33HTSA2 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 security solutions, with global manufacturing and automotive qualification infrastructure.

The TLE4274 product line delivers AEC-Q100-qualified linear regulators for automotive power distribution, designed specifically for reliability in harsh environments including engine compartments and ADAS sensor nodes.

FAQ

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

The minimum input voltage is 4.7 V per datasheet operating range. At 400 mA load, dropout voltage reaches up to 1.2 V, so VI must be ≥4.5 V to sustain 3.3 V output. Below 4.7 V, regulation is not guaranteed across temperature and process variation.

Can TLE4274GSV33HTSA2 replace a 5 V version like TLE4274GV50 in the same PCB layout?

No-pinout is identical but output voltage is fixed at 3.3 V. Swapping requires verification of downstream 3.3 V tolerance and adjustment of any level-shifting or feedback networks relying on 5 V reference. The 5 V variant has different internal resistor divider and cannot be reconfigured.

Is an input capacitor mandatory, and what type is recommended?

Yes-a 100 nF ceramic capacitor is mandatory at Pin 1 (I) and must be placed within 3 mm of the IC. This suppresses high-frequency noise and damps LC oscillation between input trace inductance and bulk capacitance. X7R or C0G dielectric is preferred for stable capacitance over temperature.

Does the device require a heatsink for 400 mA operation at 85 °C ambient?

No external heatsink is needed. In PG-SOT223-4 with 1 cm² copper pour on Pin 4 (GND), R_thja = 100 K/W. At 400 mA and 1.2 V dropout (0.48 W dissipation), junction rise is ~48 °C above ambient-well below 150 °C max, even at 85 °C ambient.