Infineon Technologies TLE4270SNKSA1

Overview

TLE4270SNKSA1 from Infineon Technologies is a 5-V fixed-output, low-dropout linear voltage regulator with integrated reset generator, ±2% output tolerance, 650 mA continuous output current, and automotive-grade protection features including overvoltage (65 V/400 ms), overtemperature, reverse polarity, and short-circuit proofing. It operates from 5.5 V to 42 V input and is used in engine control units (ECUs) for stable 5-V supply to microcontrollers and sensors.

For engineers reviewing the TLE4270SNKSA1 datasheet, TLE4270SNKSA1 pinout, TLE4270SNKSA1 application, or TLE4270SNKSA1 equivalent, key selection criteria include its adjustable reset delay via external capacitor, 350 mV typical dropout at 550 mA, internal 30 kΩ pull-up on RO, ESD > 4000 V, and qualification per AEC-Q100 Grade 0 (−40 °C to +150 °C junction).

Technical Context

This regulator uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain regulation across load and line variations. Its reset generator monitors V_Q against a 4.65 V threshold and provides an open-collector RO signal with programmable delay via capacitor on pin D.

The device integrates multiple protection circuits: overvoltage shutdown triggers at 44 V (hysteresis restores operation below 36 V), thermal shutdown activates at ~170 °C junction, and reverse-polarity protection blocks conduction when input is negative. Input-to-output isolation remains functional up to 65 V for ≤400 ms.

Key Specifications

Pinout & Package

Package: P-TO220-5-12 - thermally enhanced 5-pin through-hole package with exposed tab (internally connected to GND) for direct heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5-V automotive LDO with reset applications.

Compared with TLV73350PDBVR and TPS7B6950QDCYRQ1, TLE4270SNKSA1 uniquely combines 650 mA output, Grade 0 qualification, adjustable reset, and 65 V transient tolerance-making it the only option qualified for primary 5-V regulation in high-power, high-temperature automotive ECUs.

Availability

TLE4270SNKSA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera ECUs requiring stable component supply across extended temperature and transient-voltage conditions.

Supply support for TLE4270SNKSA1 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 manufacturing and automotive qualification infrastructure.

TLE4270SNKSA1 belongs to Infineon's TLE family of automotive linear regulators, designed specifically for demanding power-supply roles in engine, transmission, and chassis control systems where reliability, transient immunity, and functional safety are critical.

FAQ

What is the maximum allowable input voltage for continuous operation?

The TLE4270SNKSA1 supports continuous input voltages from 6 V to 42 V. Operation above 42 V is permitted only for transients up to 65 V and duration ≤400 ms, as defined by ISO 7637-2 Pulse 5a. Exceeding these limits risks permanent damage due to overvoltage protection activation or junction overheating.

How is the reset delay time calculated using the external capacitor?

Reset delay t_rd is determined by the RC time constant formed by the external capacitor on pin D and the internal 30 kΩ pull-up resistor. With C_D = 100 nF, t_rd ≈ 13 ms (typical). For precise timing, use Equation: t_rd ≈ 0.13 × R_int × C_D, where R_int = 30 kΩ ±30% and C_D must be low-ESR ceramic.

Can the RO pin drive a standard CMOS input directly?

Yes-the RO pin is an open-collector output with internal 30 kΩ pull-up to V_Q. It can directly interface with 5-V CMOS inputs (e.g., MCU RESET pin) without external pull-up. When asserted, RO sinks ≥3 mA at V_OL ≤ 0.4 V, satisfying standard TTL/CMOS low-level thresholds.

Is thermal derating required when operating at 650 mA in still air?

Yes-when mounted on a standard 80 × 80 × 1.5 mm PCB (35 µm Cu), R_thj-a is 65–79 K/W. At 650 mA and 13.5 V input, power dissipation reaches ~5.5 W, raising junction temperature by ~430 °C above ambient-exceeding 150 °C limit. A heatsink or forced airflow is mandatory; use R_thj-c = 3 K/W path to heatsink for safe operation.