Infineon Technologies IFX1117GSV33

Overview

IFX1117GSV33 from Infineon is a fixed-output 3.3 V, 1.0 A low-dropout linear voltage regulator in PG-SOT223-4 package, featuring ±2% output accuracy, 1.1–1.4 V dropout at 1.0 A, short-circuit and overtemperature protection, and operation from 4.7 V to 15 V input for industrial power rails in embedded controllers and sensor interfaces.

For engineers reviewing the IFX1117GSV33 datasheet, IFX1117GSV33 pinout, IFX1117GSV33 application, or IFX1117GSV33 equivalent, this part delivers stable 3.3 V regulation with <10 mV load regulation (0–800 mA), 60–65 dB PSRR at 120 Hz, and thermal shutdown activation at T_j ≥ 150 °C - critical for compact DC/DC post-regulation and FPGA I/O supply designs.

Technical Context

The IFX1117GSV33 implements a monolithic NPN-based LDO architecture with internal reference (1.25 V), error amplifier, and current-limiting transistor. Its fixed 3.3 V output is trimmed during production to ±2% tolerance across 0–125 °C junction temperature.

Protection circuitry includes foldback current limiting (1100–2250 mA trip), thermal shutdown with hysteresis, and safe operating area (SOA) enforcement. Input-to-output differential must remain ≥0.3 V for regulation, and minimum input is 4.7 V at full 1.0 A load due to V_DR = 1.3–1.4 V.

Key Specifications

Pinout & Package

Package: PG-SOT223-4 (lead-free, RoHS-compliant), with exposed thermal pad (pin 4) electrically connected to output (Q) and used for heatsinking on PCB.

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 NCP1117ST33T3G, the IFX1117GSV33 offers superior thermal performance via its dedicated output-connected thermal pad, tighter 3.3 V tolerance, and lower typical dropout at 1.0 A - making it preferred for thermally constrained, high-accuracy 3.3 V rail designs.

Availability

IFX1117GSV33 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and point-of-sale terminal designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for IFX1117GSV33 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 robust, industrial-grade linear regulators optimized for reliability in harsh environments - designed specifically for applications demanding guaranteed operation from 0 °C to 125 °C junction temperature with integrated fault protection.

FAQ

What is the minimum input voltage required for 1.0 A output current?

The IFX1117GSV33 requires a minimum input voltage of 4.7 V to maintain 3.3 V regulation at 1.0 A load, based on its maximum dropout voltage of 1.4 V at full current. Below this, output voltage collapses due to insufficient headroom; design margin should include 0.2–0.3 V for line and temperature variation.

Can the thermal pad (pin 4) be left floating or grounded?

No - pin 4 (TAB) is electrically connected internally to the output (Q) and must be soldered to a PCB copper pour tied to the 3.3 V output net. Floating or grounding it violates the device's electrical and thermal design, risking instability, reduced current capability, and premature thermal shutdown.

Is an input bypass capacitor mandatory, and what value is recommended?

Yes - a 100 nF ceramic capacitor placed within 5 mm of pin 3 (I) is mandatory to prevent oscillation and improve transient response. Larger bulk capacitance (e.g., 10 µF tantalum) may be added upstream, but the 100 nF local cap is non-optional per datasheet Figure 5 and stability analysis.

Does the IFX1117GSV33 support reverse polarity protection?

No - the device lacks internal reverse-voltage blocking. Applying negative voltage to pin 3 (I) or positive voltage to pin 1 (GND) exceeds absolute maximum ratings (–0.3 V on any pin) and can cause immediate latch-up or permanent damage. External protection diodes must be added if reverse input is possible.