Infineon Technologies TLE4274GSV33HTSA1

Overview

TLE4274GSV33HTSA1 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 of 4.7–40 V. It features short-circuit and reverse-polarity protection, thermal shutdown, and AEC-Q100 qualification for automotive power supply rails.

For engineers reviewing the TLE4274GSV33HTSA1 datasheet, TLE4274GSV33HTSA1 pinout, TLE4274GSV33HTSA1 application, or TLE4274GSV33HTSA1 equivalent, key selection criteria include dropout voltage (0.7–1.2 V at 300 mA), quiescent current (8–30 mA across load), ESR-stable output capacitance (≥10 µF, ≤2.5 Ω), junction temperature range (−40 to +150 °C), and RoHS-compliant green packaging.

Technical Context

The TLE4274GSV33HTSA1 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 monolithic low-dropout linear regulator with fixed 3.3 V output, requiring no external feedback network. Input-to-output differential must exceed 0.7 V for regulation, and stability is guaranteed only with output capacitors ≥10 µF and ESR ≤2.5 Ω over −40 to +150 °C.

Key Specifications

Pinout & Package

PG-SOT223-4 package with exposed thermal pad (pin 4 connected to GND). Pin 1: Input (VI); Pin 2 & 4: Ground (GND, internally tied to heatsink); Pin 3: Output (VQ).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PDBVR and NCP1117ST33T3G, the TLE4274GSV33HTSA1 uniquely combines AEC-Q100 qualification, reverse polarity tolerance, and integrated thermal/short-circuit protection in a thermally enhanced SOT223 package-making it the only drop-in solution for safety-critical 12 V automotive loads requiring 400 mA at 3.3 V.

Availability

TLE4274GSV33HTSA1 is available at Aetrix Electronics and suitable for automotive body control modules, engine control unit sensor supplies, ADAS camera modules, and infotainment head units requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for TLE4274GSV33HTSA1 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 automotive qualification infrastructure.

The TLE4274 product line delivers AEC-Q100-qualified linear regulators for automotive power distribution, designed specifically to replace discrete solutions in 12 V/24 V battery-fed electronic control units with robust fault handling and thermal resilience.

FAQ

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

The TLE4274GSV33HTSA1 requires a minimum input voltage of 4.7 V to maintain 3.3 V output regulation across its full operating temperature range. At 300 mA load, the dropout voltage is 0.7–1.2 V, so input must exceed 4.0–4.5 V. Below 4.7 V, output voltage drops linearly per the dropout characteristic, and regulation is not guaranteed per datasheet specifications.

Can this regulator be used with ceramic output capacitors?

Yes, but only if the ceramic capacitor's effective series resistance (ESR) is ≥1 Ω - typically achieved using a 10 µF X7R ceramic with a series resistor or by selecting a capacitor with inherent ESR. The datasheet specifies stability for C_Q ≥10 µF and ESR ≤2.5 Ω, which excludes most low-ESR ceramics unless ESR is intentionally added.

Does the TLE4274GSV33HTSA1 require an input capacitor?

Yes - a 100 nF ceramic capacitor must be placed directly between pin 1 (I) and pin 2/4 (GND), as close as possible to the IC. This capacitor compensates for line inductance and prevents oscillation due to input impedance interactions; omission risks instability or voltage overshoot during load transients.

Is pin 4 electrically isolated from ground in the PG-SOT223-4 package?

No - pin 4 is internally connected to the GND terminal and the exposed thermal pad. It must be soldered to a PCB ground plane for both electrical return and thermal conduction. Using pin 4 as a floating thermal pad or isolating it from GND violates the internal construction and compromises both electrical performance and thermal safety limits.