Infineon Technologies IFX25401TEV50ATMA1

Overview

IFX25401TEV50ATMA1 from Infineon Technologies is a monolithic low-dropout linear voltage regulator delivering a fixed 5 V output at up to 400 mA, with ±2% output accuracy, 250–500 mV dropout at 250 mA, and operation from 4.5 V to 40 V input. It features enable control, reverse polarity protection, overtemperature shutdown, and current limiting-designed for battery-powered industrial systems requiring ultra-low quiescent current (<10 µA in shutdown).

For engineers reviewing the IFX25401TEV50ATMA1 datasheet, IFX25401TEV50ATMA1 pinout, IFX25401TEV50ATMA1 application, or IFX25401TEV50ATMA1 equivalent, key selection criteria include fixed 5 V output stability under wide input range (6–28 V), thermal performance on PG-TO252-5 footprint (R_thJA = 27 K/W), and integrated fault protections for harsh-environment deployment.

Technical Context

The IFX25401TEV50 implements a bandgap-referenced control amplifier with saturation control and integrated protection circuitry. Its adjustable version uses an external resistor divider on the VA pin; the TEV50 variant fixes output to 5 V by internal configuration, eliminating VA connection requirements.

Thermal management relies on direct heat slug grounding and PCB copper area coupling-R_thJC = 4 K/W to the exposed slug, enabling 400 mA continuous operation with ≥300 mm² heatsink area (R_thJA = 52 K/W) in natural convection per JEDEC JESD51-3.

Key Specifications

Pinout & Package

IFX25401TEV50ATMA1 is housed in PG-TO252-5 (D-Pak) package with exposed heat slug electrically connected to GND. The 5-pin configuration supports high-current thermal dissipation via PCB copper fill under the slug.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE42754G and MCP1703T-5002E/MB, IFX25401TEV50ATMA1 uniquely balances industrial ruggedness (reverse polarity, 400 mA), thermal efficiency (R_thJA = 27 K/W), and system-level protection-making it optimal for non-automotive 24 V embedded systems needing robust, maintenance-free operation.

Availability

IFX25401TEV50ATMA1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitoring units, and building automation sensors requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for IFX25401TEV50ATMA1 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, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IFX25401 product line delivers rugged, protected LDO regulators for industrial environments-designed to replace discrete protection circuits with monolithic solutions that withstand voltage transients, reverse connections, and thermal stress without external components.

FAQ

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

The IFX25401TEV50ATMA1 requires VI ≥ 5.5 V to maintain 5 V output at 400 mA, based on maximum 500 mV dropout. Below this, output voltage drops linearly with input; datasheet specifies functional input range starts at 4.5 V but guarantees regulation only above VI = VQ + Vdr (max).

Can the N.C. pin (Pin 4) be used as an additional ground connection?

No-Pin 4 is internally unconnected. While it may be tied to GND for mechanical stability or EMI reduction, it provides no electrical path. Grounding must occur through Pin 3 (GND) and the exposed heat slug, which is internally bonded to GND and requires low-impedance PCB copper connection.

Does the device require an external voltage divider for the 5 V fixed version?

No-the IFX25401TEV50ATMA1 is the fixed 5 V variant; its VA pin (Pin 4 in adjustable versions) is unused and marked N.C. Output voltage is set internally, eliminating external resistors. Only adjustable versions (IFX25401TEV) require a voltage divider between VA, Q, and GND.

How does the overtemperature shutdown behave during continuous overload?

When junction temperature exceeds 150 °C, the device shuts down output and holds off until Tj falls below ~135 °C (15 °C hysteresis). It is not designed for repetitive cycling-continuous overload will cause thermal oscillation and potential reliability degradation. Proper heatsinking and current limiting must prevent sustained >400 mA loads.