Infineon Technologies IFX4949SJXUMA1

Overview

IFX4949SJXUMA1 from Infineon Technologies is a monolithic 5 V low-dropout linear voltage regulator with integrated undervoltage reset, input voltage sense comparator, and preregulator output. It delivers up to 100 mA output current with dropout voltage ≤ 0.5 V at 100 mA, ±1% output voltage accuracy at 25°C, and supports transient input up to 40 V for <1 s. It is designed for microcontroller-supply applications in industrial and consumer systems where stable 5 V bias and system supervision are required.

For engineers reviewing the IFX4949SJXUMA1 datasheet, IFX4949SJXUMA1 pinout, IFX4949SJXUMA1 application, or IFX4949SJXUMA1 equivalent, key selection criteria include guaranteed 5 V ±1% regulation across 6–28 V input, programmable reset delay via external capacitor, open-collector sense/reset outputs, thermal shutdown, and PG-DSO-8 package compatibility with standard PCB layout practices.

Technical Context

The IFX4949SJXUMA1 integrates three functional blocks: a precision LDO regulator (5 V ±1%), a voltage-sense comparator with open-collector SO output, and a dedicated RESET generator with externally adjustable delay via capacitor on pin D. Its preregulator output (PRE) provides a buffered 7 V supply for auxiliary circuitry.

It operates within a functional input range of 5.5–28 V DC, extends to 3.5–40 V under transient conditions (<1 s), and includes thermal shutdown at 165 °C, short-circuit protection, and ESD robustness per HBM (±4 kV). The device is explicitly excluded from automotive use per datasheet guidance.

Key Specifications

Pinout & Package

IFX4949SJXUMA1 is housed in a PG-DSO-8 (SOIC-8) thermally enhanced surface-mount package with exposed thermal pad (pin 5 connected to GND internally). The package supports standard reflow profiles and delivers R_thJA = 116 K/W on 2-layer FR4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V LDO with reset and sense applications.

Compared with TLV70750PDBVR and MAX6720ASATD3+T, IFX4949SJXUMA1 uniquely integrates LDO regulation, programmable reset, voltage sense, and auxiliary preregulation in one PG-DSO-8 package - reducing component count, PCB area, and interconnect risk in space-constrained industrial controllers.

Availability

IFX4949SJXUMA1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart meter power management, home automation gateways, and factory floor sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IFX4949SJXUMA1 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 9001 and IATF 16949.

The IFX4949 belongs to Infineon's StandardPower linear regulator family, engineered for high-precision, low-power industrial control systems where reliability, thermal resilience, and integrated supervision functions are prioritized over automotive qualification.

FAQ

Can IFX4949SJXUMA1 be used in automotive applications?

No. The datasheet explicitly states "The IFX4949 is not to be used in automotive applications" and directs users to the TLF4949 series instead. IFX4949SJXUMA1 lacks AEC-Q100 qualification, automotive-grade temperature screening (-40°C to +125°C operating range is insufficient for under-hood environments), and fails to meet automotive ESD (ISO 10605) or EMC requirements.

What is the maximum allowable input voltage for continuous operation?

The maximum continuous DC input voltage is 28 V, as specified in Section 4.2.1 (Functional Range). Input voltages up to 40 V are permitted only for transient durations less than 1 second and require careful thermal design to avoid exceeding the 165 °C thermal shutdown threshold under load.

How is the reset delay time determined?

The reset delay is set by an external capacitor connected between pin D and GND. The delay time follows a linear relationship with capacitance: approximately 100 ms per 100 nF, as shown in Figure 10 of the datasheet. No internal resistor is required - the timing network is fully external and user-adjustable.

Is the SO (Sense Output) pin actively driven or open-collector?

The SO pin is an open-collector NPN output, identical in structure to the RO (Reset Output) pin. It requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V) to generate a high-true signal. When asserted, it pulls low to indicate that the SI input voltage has fallen below the internal threshold (~4.75 V).