Infineon Technologies IFX21401MBHTSA1

Overview

IFX21401MBHTSA1 from Infineon Technologies is a monolithic low-dropout voltage tracking regulator in PG-SCT595-5 package, delivering 50 mA output current with ±25 mV tracking accuracy across 6–40 V input range and supporting -40 °C to 125 °C junction temperature. It features reverse polarity protection, overtemperature shutdown, short-circuit protection to ground or supply, and operates with as little as 1 µF output capacitor. Used for off-board sensor regulation in harsh industrial environments.

For engineers reviewing the IFX21401MBHTSA1 datasheet, IFX21401MBHTSA1 pinout, IFX21401MBHTSA1 application, or IFX21401MBHTSA1 equivalent, key selection considerations include its adjustable tracking reference input (2.5–36 V), 300 mV max dropout at 10 mA, integrated enable/disable via ADJ/EN pin, and thermal resistance of 81 K/W on 2s2p FR4 board.

Technical Context

The IFX21401MBHTSA1 implements a PNP pass transistor-based tracking architecture where output voltage VQ follows the voltage applied to the ADJ/EN pin with high fidelity. Its control loop stability depends explicitly on output capacitor value (≥1 µF) and ESR (≤3 Ω at 10 kHz), not internal compensation.

Protection functions operate independently: reverse polarity protection limits reverse current to -2 mA at VI = -16 V; overtemperature shutdown activates at ~151 °C junction equilibrium; current limiting engages at 51–120 mA depending on output voltage condition. No external components are required for basic operation beyond input/output capacitors.

Key Specifications

Pinout & Package

Package: PG-SCT595-5 - thermally enhanced 5-pin SMD package with dual GND pins (2 & 5) internally connected and designed for PCB heatsink area mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout tracking regulator applications.

Compared with TLE42754G and LM317LZ, IFX21401MBHTSA1 uniquely combines tracking functionality, integrated fault protections, and ultra-low standby current in a thermally optimized 5-pin package-making it optimal for space-constrained, reliability-critical sensor interface rails.

Availability

IFX21401MBHTSA1 is available at Aetrix Electronics and suitable for industrial sensor power, appliance control boards, HDTV panel bias supplies, and network router PoE auxiliary rails requiring stable component supply across extended temperature and voltage ranges.

Supply support for IFX21401MBHTSA1 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 industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The IFX21401 belongs to Infineon's high-reliability linear regulator product line, engineered specifically for off-board load regulation in electrically noisy, thermally demanding environments such as factory automation and consumer electronics power subsystems.

FAQ

What is the minimum output capacitance required for stable operation?

The IFX21401MBHTSA1 requires a minimum 1 µF output capacitor with ESR ≤3 Ω at 10 kHz. This specification accounts for worst-case ±30% capacitance tolerance and ensures control loop stability across temperature and load. Ceramic capacitors meeting these criteria are validated and recommended; tantalum or aluminum electrolytics are not required.

Can the ADJ/EN pin be used to set output voltages below 2.5 V?

No. The ADJ/EN pin has a functional tracking range of 2.5 V to 36 V per the datasheet's "Functional Range" table. Applying less than 2.5 V violates specified operating conditions and may result in unregulated output or undefined behavior. For sub-2.5 V outputs, an external reference or level-shifting circuit is required.

How does reverse polarity protection behave during negative input voltage events?

During reverse input (VI < 0 V), the IFX21401MBHTSA1 limits reverse current to -2 mA maximum at VI = -16 V. Thermal shutdown is inactive in this mode, so prolonged reverse bias must be avoided. The device does not sink significant current, minimizing power dissipation-but external fusing or diode isolation remains advisable for sustained reverse conditions.

Is the PG-SCT595-5 package RoHS compliant and lead-free?

Yes. The IFX21401MBHTSA1 is marked as a green product and explicitly stated as RoHS compliant in the datasheet. The PG-SCT595-5 package uses lead-free terminations and complies with EU Directive 2011/65/EU. No exemptions apply, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3.