Infineon Technologies IFX1117GSV

Overview

IFX1117GSV from Infineon Technologies is a monolithic fixed-output NPN linear voltage regulator in SOT223-4 package, delivering 3.3 V ±2% at up to 1.0 A with dropout voltage as low as 1.00 V at 100 mA. It integrates short-circuit and overtemperature protection, operates from 4.7 V to 15 V input, and targets point-of-load regulation in industrial power rails.

For engineers reviewing the IFX1117GSV datasheet, IFX1117GSV pinout, IFX1117GSV application, or IFX1117GSV equivalent, key selection criteria include guaranteed 3.3 V output accuracy across temperature, thermal resistance of 81 K/W with heatsink, RMS noise of 30 ppm, PSRR of 65 dB at 120 Hz, and stable operation with ≥10 µF output capacitor (ESR ≤ 20 Ω).

Technical Context

The IFX1117GSV implements a fixed-output NPN pass transistor architecture with internal bandgap reference and error amplifier, enabling precise 3.3 V regulation without external feedback components. Its protection circuitry includes foldback current limiting and thermal shutdown triggered at T_j ≥ 150 °C.

Dropout voltage rises predictably from 1.00 V (100 mA) to 1.40 V (1.0 A), and line/load regulation are specified at 1 mV and 10 mV respectively-critical for maintaining stability under varying input and load conditions in embedded control subsystems.

Key Specifications

Pinout & Package

Package: P-SOT223-4 (SOT223 with exposed pad for thermal enhancement). Pin 4 is internally connected to Pin 2 (output) and serves as heatsink terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-33CDCR and LD1117S33TR, IFX1117GSV offers superior thermal management via Pin 4 heatsink connection, guaranteed 1.0 A performance across full temperature range, and optimized stability with standard 10 µF/20 Ω ESR capacitors-making it preferred for industrial and automotive applications demanding robustness and long-term reliability.

Availability

IFX1117GSV is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical patient monitoring sensors, and test & measurement signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for IFX1117GSV 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 quality certification to ISO/TS 16949 and ISO 9001.

The IFX1117 product line delivers rugged, thermally enhanced linear regulators for mission-critical industrial and automotive power rails where reliability under thermal stress and electrical overload is mandatory.

FAQ

What is the minimum input voltage required for full 1.0 A output at 3.3 V?

The IFX1117GSV requires a minimum input voltage of 4.7 V to sustain 1.0 A output at 3.3 V, based on its specified dropout voltage of 1.40 V at full load. Below this threshold, current limiting engages to protect the device, reducing delivered output current proportionally.

Can Pin 4 be left unconnected or used only for thermal relief?

No-Pin 4 is electrically connected to Pin 2 (output) and must be soldered to a PCB copper pour for both thermal conduction and EMI suppression. Leaving it floating violates the thermal design requirements and may cause instability or premature thermal shutdown under load.

Is an external capacitor required on the output, and what are its critical parameters?

Yes-a minimum 10 µF output capacitor with ESR ≤ 20 Ω is mandatory for stability, as confirmed by the "Region of Stability" graph in the datasheet. Ceramic, tantalum, or polymer capacitors meeting these specs ensure loop stability across temperature and load; aluminum electrolytics are not recommended due to higher ESR.

How does the IFX1117GSV behave during short-circuit conditions?

Under short-circuit, the IFX1117GSV activates foldback current limiting, reducing output current to ~200 mA while maintaining regulation. Simultaneously, junction temperature rises; if it reaches 150 °C, thermal shutdown disables the output until cooldown. Both protections operate independently and are fully integrated-no external components needed.