Infineon Technologies TLE42702AKSA1

Overview

TLE42702AKSA1 from Infineon Technologies is a 5-V fixed-output, low-dropout linear voltage regulator with integrated reset generator, reverse polarity protection, and overvoltage/overtemperature/short-circuit protection. It delivers up to 650 mA output current at ≤2% output voltage tolerance (4.90–5.10 V), supports input voltages up to 42 V (65 V transient ≤400 ms), and operates across −40 °C to +150 °C junction temperature - deployed in automotive body control modules for stable 5-V supply to microcontrollers and sensors.

For engineers reviewing the TLE42702AKSA1 datasheet, TLE42702AKSA1 pinout, TLE42702AKSA1 application, or TLE42702AKSA1 equivalent, key selection criteria include its adjustable power-on reset delay (via external capacitor on Pin 4), open-collector reset output (Pin 2), TO-220-5 package thermal performance (R_thj-a = 65–79 K/W), and AEC-Q100 qualification for automotive use.

Technical Context

The device uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain regulation under varying load and input conditions. Its internal reset generator triggers when V_Q falls below 4.5–4.8 V and provides externally adjustable delay via capacitor on Pin 4 (D), with typical delay of 13 ms for 100 nF.

Protection circuitry includes reverse-polarity blocking, overvoltage shutdown at 42–46 V (with hysteresis restoring operation below 36 V), thermal shutdown at ~150 °C, and current limiting that clamps output at 650–850 mA during short-circuit events.

Key Specifications

Pinout & Package

Package: PG-TO220-5-11 (standardized variant of TO-220-5 with heatsink-connected GND pin and defined pin 1 orientation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and NCV8664ST50T3G, TLE42702AKSA1 uniquely combines 650 mA drive, adjustable reset timing, 65-V transient tolerance, and full automotive protection suite - making it the only option among the three qualified for high-reliability engine bay deployment.

Availability

TLE42702AKSA1 is available at Aetrix Electronics and suitable for automotive body control modules, engine control unit sensor rails, LED headlamp drivers, and infotainment power sequencing requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for TLE42702AKSA1 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 industrial control ICs, with global manufacturing and automotive qualification infrastructure.

TLE42702AKSA1 belongs to Infineon's TLE family of automotive-grade linear regulators, designed specifically for robust 5-V supply generation in harsh environments including engine compartments and chassis-mounted ECUs.

FAQ

What is the maximum allowable input voltage for continuous operation?

The TLE42702AKSA1 supports continuous input voltage from 6 V to 42 V. Transient overvoltage up to 65 V is tolerated for durations ≤400 ms, after which overvoltage protection activates. Operation above 42 V beyond this limit risks permanent damage, and the device will not resume regulation until input drops below 36 V due to built-in hysteresis.

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

Reset delay time (t_rd) is determined by the capacitance connected between Pin 4 (D) and GND. For a 100 nF capacitor, typical delay is 13 ms. The relationship is approximately linear: doubling capacitance doubles delay. The internal charge current is 8–25 µA, so t_rd ≈ C × 1.8 V / I_D,c, where 1.8 V is the effective threshold swing across the capacitor.

Can Pin 2 (RO) drive a standard CMOS input directly?

Yes - Pin 2 (RO) is an open-collector output with internal 30 kΩ pull-up to V_Q. When active (low), it pulls to <60 mV at 3 mA sink current, compatible with TTL and 5-V CMOS inputs. No external pull-up is required, but an external resistor may be added if interfacing with 3.3-V logic to avoid exceeding V_IL thresholds.

Is thermal derating required when mounting on a standard FR-4 PCB without copper pour?

Yes - the datasheet specifies R_thj-a = 65–79 K/W for a 80 × 80 × 1.5 mm PCB with 35 µm copper and zero airflow. Without adequate copper pour or heatsinking, junction temperature can exceed 150 °C at full 650 mA load above 85 °C ambient. Derate output current by ~10 mA/°C above 100 °C ambient unless enhanced thermal layout is implemented.