NXP Semiconductors NX1117CADJZ,115

Overview

NX1117CADJZ,115 from NXP Semiconductors is an adjustable-output low-dropout linear voltage regulator in SOT223 package, delivering up to 1 A output current with ±1 % reference voltage accuracy (1.25 V nominal), dropout voltage ≤1.2 V at 800 mA, and operation over −40 °C to 125 °C ambient. It serves as a post-regulator for DC-DC converters in USB-powered devices and industrial point-of-load systems.

For engineers reviewing the NX1117CADJZ,115 datasheet, NX1117CADJZ,115 pinout, NX1117CADJZ,115 application, or NX1117CADJZ,115 equivalent, key selection criteria include adjustable output configuration (via external resistors), SOA control for safe high-V_IN–V_OUT operation, thermal shutdown, no minimum load requirement, and compatibility with standard 680 nF input/output capacitors.

Technical Context

The NX1117CADJZ,115 implements internal bandgap reference (1.25 V) and error amplifier driving a PNP pass transistor, enabling stable regulation with external R1/R2 feedback network. Its Safe Operating Area (SOA) control dynamically limits output current under high input-to-output differential conditions to prevent thermal runaway.

It features built-in thermal shutdown triggered at 135 °C junction temperature and output current limiting (1.0–1.5 A typical), with quiescent current fixed at 5–6 mA across input voltages up to 20 V. The device operates without minimum load and maintains <0.4 % load regulation over 10–800 mA output range.

Key Specifications

Pinout & Package

SOT223 (SC-73) plastic surface-mount package with integrated heat sink pad on lead 2/4; footprint matches JEDEC MO-178AB, 6.7 mm × 3.7 mm × 1.8 mm height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Compared with TLV1117ADJ and LD1117S25TR, the NX1117CADJZ,115 delivers tighter reference accuracy, wider temperature range, and integrated SOA protection - making it suitable for industrial and automotive post-regulation where reliability under variable load and input conditions is critical.

Availability

NX1117CADJZ,115 is available at Aetrix Electronics and suitable for USB devices, battery chargers, hard drive controllers, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle support.

Supply support for NX1117CADJZ,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 applications.

The NX1117C/NX1117CE series was designed specifically for high-reliability post-regulation in power-constrained systems, emphasizing thermal robustness, wide input range, and precision output control without minimum load dependency.

FAQ

What is the reference voltage tolerance of NX1117CADJZ,115?

The NX1117CADJZ,115 has a reference voltage (V_REF) of 1.250 V with ±1 % accuracy over temperature and load - meaning V_REF stays within 1.238 V to 1.262 V at 25 °C and within 1.225 V to 1.275 V across −40 °C to 125 °C. This tolerance directly impacts output accuracy in adjustable configurations using external resistors, and is tighter than the ±1.25 % offered by the NX1117CEADJZ variant.

Does NX1117CADJZ,115 require a minimum load current to maintain regulation?

No, the NX1117CADJZ,115 does not require a minimum load current to maintain regulation - unlike many older LDOs. This is confirmed in the datasheet's "Features and benefits" section and verified in Table 8 load regulation test conditions (0 mA ≤ I_OUT ≤ 800 mA). The absence of minimum load simplifies design in low-power sleep modes and eliminates need for dummy loads.

How is thermal performance affected by PCB layout for NX1117CADJZ,115?

Thermal resistance from junction to ambient (R_th(j-a)) for NX1117CADJZ,115 drops from 150 K/W (no copper) to 72 K/W (FR4 with 6 cm² output pad) and 45 K/W (ceramic Al₂O₃ PCB). Proper layout - including soldering pins 2 and 4 to ≥6 cm² copper pour - is essential to sustain 1 A continuous output at elevated ambient temperatures without triggering thermal shutdown.

Can NX1117CADJZ,115 replace fixed-output variants like NX1117C33Z in the same footprint?

Yes, NX1117CADJZ,115 shares identical SOT223 package, pinout, and thermal characteristics with fixed-output NX1117C/NX1117CE variants. However, the ADJ pin (pin 1) replaces GND in fixed versions - requiring PCB redesign of the feedback network and removal of the fixed-output resistor network. Pin compatibility exists, but functional replacement requires schematic changes.

What is the maximum input voltage rating for NX1117CADJZ,115?

The absolute maximum input voltage for NX1117CADJZ,115 is 20 V, as specified in Table 5 "Limiting values" and reaffirmed in Table 6 "Recommended operating conditions". Operation above this level risks permanent damage. For reliable long-term use, input should remain ≤20 V with appropriate derating for thermal and SOA constraints - especially when V_IN–V_OUT exceeds 10 V.