Infineon Technologies TLE4276V10NKSA1

Overview

TLE4276V10NKSA1 from Infineon Technologies is a fixed-output 10 V low-dropout linear voltage regulator in TO-220 AB/5 (Option E3122) 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 11 V to 40 V input, features reverse-polarity and short-circuit protection, and is qualified for automotive power supply rails feeding ECUs and body control modules.

For engineers reviewing the TLE4276V10NKSA1 datasheet, TLE4276V10NKSA1 pinout, TLE4276V10NKSA1 application, or TLE4276V10NKSA1 equivalent, key selection criteria include its 10 V fixed output, 400 mA load capability, inhibit-input logic interface, thermal shutdown behavior, and TO-220-5 mechanical compatibility with heatsink mounting in constrained under-hood environments.

Technical Context

The TLE4276V10NKSA1 uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain regulation across load and temperature. Its internal protection circuits independently monitor overtemperature, overload, and reverse polarity conditions, disabling output without latch-up.

It implements a low-impedance inhibit input (INH) that pulls quiescent current below 10 µA when asserted low, enabling system-level power sequencing. The device requires ≥22 µF output capacitor with ESR ≤3 Ω for stability and includes built-in input capacitance compensation support via optional series damping resistor.

Key Specifications

Pinout & Package

Package: TO-220 AB/5 (Option E3122), thermally enhanced through-hole package with isolated tab, rated R_thj-a = 65 K/W (mounted on PCB with heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-10CDR and MC7810CD2TR4, TLE4276V10NKSA1 provides automotive-grade fault resilience (reverse polarity, short-circuit, thermal shutdown), precise 10 V output with ±4% tolerance, and system-controllable inhibit-making it uniquely suited for safety-critical ECU power domains where reliability outweighs cost sensitivity.

Availability

TLE4276V10NKSA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and heated seat controllers requiring stable component supply with full automotive qualification and long-term lifecycle support.

Supply support for TLE4276V10NKSA1 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 qualification infrastructure.

The TLE4276 product line delivers AEC-Q100-qualified linear regulators optimized for automotive power distribution networks, emphasizing fault resilience, wide input range, and thermal robustness in harsh under-hood environments.

FAQ

What is the maximum allowable input voltage for TLE4276V10NKSA1?

The absolute maximum input voltage is 45 V, but the recommended operating range is 11 V to 40 V. Operation above 40 V risks permanent damage even for brief transients unless external clamping (e.g., TVS diode) is implemented per ISO 7637-2 Pulse 5a requirements.

Does TLE4276V10NKSA1 require an external voltage divider for 10 V output?

No. The 'V10' suffix denotes a factory-trimmed fixed 10 V output; pins 4 (N.C.) and 5 (Q) are used as-is. External feedback components are required only for the adjustable version (TLE4276V), not for TLE4276V10NKSA1.

Can the inhibit pin be left unconnected?

No. Leaving INH floating may cause unpredictable enable/disable behavior due to noise coupling. It must be actively driven high (≥2 V) for normal operation or pulled low (≤1.7 V) to disable. A 10 kΩ pull-up to VIN is recommended if GPIO control is unavailable.

Is heatsinking required for full 400 mA output at 125 °C ambient?

Yes. With R_thj-a = 65 K/W and P_D ≈ 0.5 W at 12 V input/10 V output/400 mA, junction temperature rise is ~32.5 °C - acceptable at 125 °C ambient. However, for sustained 400 mA at >105 °C ambient, a minimum 10 cm² copper pour (2 oz) is advised to ensure T_j stays below 150 °C.