Infineon Technologies TLE4276V50NKSA1

Overview

TLE4276V50NKSA1 from Infineon Technologies is a fixed-output 5.0 V low-dropout linear voltage regulator in TO-220-5 package, delivering up to 400 mA output current with ±4% output voltage tolerance, 250–500 mV dropout at 250 mA, and inhibit-controlled shutdown. It operates from 6 V to 40 V input, features reverse-polarity and short-circuit protection, and is qualified for automotive power supply rails.

For engineers reviewing the TLE4276V50NKSA1 datasheet, TLE4276V50NKSA1 pinout, TLE4276V50NKSA1 application, or TLE4276V50NKSA1 equivalent, key selection criteria include dropout voltage under load, inhibit logic thresholds, thermal resistance (65 K/W junction-to-ambient), output stability with ≥22 µF/≤3 Ω ESR capacitor, and automotive-grade overtemperature shutdown at 150 °C.

Technical Context

The TLE4276V50NKSA1 uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to prevent oversaturation under high load. Its internal protection circuits implement reverse-polarity detection, current-limiting (400–1100 mA trip), and thermal shutdown at ~150 °C junction temperature.

It accepts an inhibit signal (low-active, 0.5–1.7 V off, 2–3.5 V on) that reduces quiescent current to ≤10 µA, and requires external input and output capacitors-CI for line transient damping and CQ (≥22 µF, ESR ≤3 Ω) for regulation loop stability across –40 °C to +150 °C.

Key Specifications

Pinout & Package

Package: TO-220-5 (P-TO220-5-3), through-hole, thermally enhanced with exposed tab connected to Pin 3 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-50 and MC78T05ABDTK, the TLE4276V50NKSA1 uniquely combines automotive qualification, reverse-polarity survival, low-dropout performance below 0.5 V, and microamp-level inhibit-off current-making it irreplaceable in safety-critical, always-on vehicle networks.

Availability

TLE4276V50NKSA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and telematics systems requiring stable component supply across extended temperature ranges and automotive lifecycle demands.

Supply support for TLE4276V50NKSA1 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 TLE4276 series belongs to Infineon's automotive linear regulator product line, designed specifically for robust, low-noise, and fail-safe power supply in engine, chassis, and infotainment domains.

FAQ

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

The TLE4276V50NKSA1 requires VI ≥ VQ + 0.5 V = 5.5 V for regulation at any load. At 400 mA, typical dropout is 350–500 mV, so 5.5 V input sustains 5.0 V output. Below 5.5 V, output collapses linearly with input.

Can Pin 4 (N.C.) be used as a heatsink pad or grounded externally?

No-Pin 4 is internally unconnected. Connecting it risks internal damage or unpredictable behavior. Thermal path is exclusively through Pin 3 (GND) and the exposed metal tab, which must be soldered to a PCB copper pour for effective heat dissipation.

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

Yes-an input capacitor is mandatory for stability and transient suppression. A 100 nF ceramic capacitor placed directly between Pin 1 (I) and Pin 3 (GND) is required. For high-noise environments, add a 10 µF tantalum or aluminum electrolytic in parallel, located within 5 mm of the IC.

Does the device support adjustable output voltage configurations?

No-the TLE4276V50NKSA1 is a fixed 5.0 V version. Adjustable variants (e.g., TLE4276V) exist but require external resistor dividers on Pin 4 (VA) and have different pin functions; they are not drop-in replacements for this part.