NXP Semiconductors NX1117C25Z,115

Overview

NX1117C25Z,115 from NXP Semiconductors is a fixed-output 2.5 V, ±1 % accuracy, low-dropout linear voltage regulator in SOT223 package, delivering up to 1 A output current with dropout voltage as low as 0.95 V at 100 mA, thermal shutdown, SOA control, and operation from −40 °C to +125 °C - used for post-regulation in DC-DC converters and point-of-load power in USB devices and hard drive controllers.

For engineers reviewing the NX1117C25Z,115 datasheet, NX1117C25Z,115 pinout, NX1117C25Z,115 application, or NX1117C25Z,115 equivalent, this page delivers verified specifications, thermal performance data, fixed-output LDO design context, and real-world alternative selection guidance for industrial and consumer power management designs.

Technical Context

The NX1117C25Z,115 implements internal bandgap reference (1.25 V), error amplifier, and pass transistor with Safe Operating Area (SOA) control that dynamically limits output current under high Vin–Vout conditions to prevent thermal runaway. It requires no minimum load for regulation and supports input voltages up to 20 V.

Its architecture enables stable operation with 680 nF input/output capacitors (1 Ω ESR), achieves 65 dB PSRR at 120 Hz, and maintains output voltage variation of ≤2.5 mV over line and ≤6 mV over load - critical for noise-sensitive analog and digital loads in embedded systems.

Key Specifications

Pinout & Package

The NX1117C25Z,115 is housed in a medium-power SOT223 (SC-73) surface-mount plastic package with integrated heat sink pad on lead 2/4. Pin 1 is GND; pins 2 and 4 are common VOUT; pin 3 is VIN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-25CDR and LD1117S25TR, the NX1117C25Z,115 delivers tighter output accuracy (±1 % vs. ±2 %), higher current (1 A vs. 800 mA), SOA protection for dynamic loads, and superior PSRR - making it preferred for demanding industrial and storage applications requiring long-term stability and thermal resilience.

Availability

NX1117C25Z,115 is available at Aetrix Electronics and suitable for USB device power management, hard drive controller point-of-load regulation, and post-regulation in switching DC-DC converters requiring stable component supply with full traceability and lifecycle support.

Supply support for NX1117C25Z,115 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The NX1117C series was designed specifically for high-reliability, low-noise point-of-load regulation in space-constrained industrial and consumer electronics - emphasizing thermal robustness, accuracy, and ease of integration without external compensation.

FAQ

What is the maximum input voltage for the NX1117C25Z,115?

The NX1117C25Z,115 supports an absolute maximum input voltage of 20 V per its limiting values table. For reliable long-term operation, the recommended maximum input is 12 V when delivering 800 mA output - ensuring safe thermal margin within the SOA envelope. Exceeding 20 V risks permanent damage.

Does the NX1117C25Z,115 require an external capacitor on the ADJ pin?

No - the NX1117C25Z,115 is a fixed-output variant with pin 1 configured as GND, not ADJ. Only adjustable versions (e.g., NX1117CADJZ) use the ADJ pin and require external resistor dividers. The NX1117C25Z,115 needs only input and output capacitors (680 nF each, 1 Ω ESR).

What is the thermal resistance (Rth j-a) of the NX1117C25Z,115 on a standard FR4 PCB?

When mounted on a standard FR4 PCB with single-sided copper and tin-plated finish, the NX1117C25Z,115 has a typical junction-to-ambient thermal resistance of 150 K/W. With a 6 cm² output copper pad, Rth j-a improves to 72 K/W - critical for sustaining 1 A continuous current at elevated ambient temperatures.

How does the SOA control function in the NX1117C25Z,115?

The SOA control in the NX1117C25Z,115 actively limits output current based on the instantaneous Vin–Vout differential - reducing IOUT as voltage drop increases to maintain safe power dissipation. This prevents thermal runaway during input surges or output short-circuits without relying solely on thermal shutdown delay.

Is the NX1117C25Z,115 RoHS compliant and halogen-free?

Yes - the NX1117C25Z,115 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Its SOT223 package uses lead-free matte tin plating and complies with NXP's environmental policy, as confirmed in the official product change notice PCN-11285.