onsemi NCP103AMX100TCG

Overview

NCP103AMX100TCG from onsemi is a 150 mA CMOS low-dropout linear regulator with fixed 1.0 V output, optimized for space-constrained, noise-sensitive battery-powered systems. It delivers ±1% output accuracy at room temperature, 75 mV typical dropout at 150 mA (for V_OUT = 3.3 V), and 75 dB PSRR at 1 kHz - enabling stable power for RF and precision analog circuitry in portable electronics.

For engineers reviewing the NCP103AMX100TCG datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low quiescent current (50 µA typ.), active output discharge function (enabled in "A"-suffix variants), stability with 1 µF ceramic output capacitor, and uDFN4 1.0×1.0 mm package compatibility with high-density PCB layouts.

Technical Context

The NCP103AMX100TCG employs a PMOS pass transistor architecture with dynamic quiescent current adjustment to minimize IQ across load conditions. Its internal bandgap reference and error amplifier deliver tight regulation under line/load transients, while thermal shutdown (160°C) and current limiting (550 mA typ.) ensure robust fault protection.

This variant includes an active output discharge transistor (R_DIS = 100 Ω typ.) activated during shutdown, ensuring rapid V_OUT decay to GND - critical for sequencing-sensitive systems. The EN pin features hysteresis (0.4 V low threshold / 0.9 V high threshold) and internal 300 nA pull-down, supporting reliable enable control without external components.

Key Specifications

Pinout & Package

Package: uDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (Case 517CU). Thermal resistance R_JA = 170°C/W on 1 oz FR-4 with 645 mm² copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1002E/MB and XC6210B102MR-G, the NCP103AMX100TCG uniquely combines 150 mA drive, active output discharge, and 50 µA IQ in a 1.0×1.0 mm footprint - making it optimal for miniaturized, sequenced battery-powered systems where both efficiency and controlled power-down matter.

Availability

NCP103AMX100TCG is available at Aetrix Electronics and suitable for wearable health monitors, BLE peripheral modules, industrial wireless transmitters, and portable medical devices requiring stable component supply with long-term manufacturability.

Supply support for NCP103AMX100TCG 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP103AMX100TCG belongs to onsemi's precision LDO family designed specifically for ultra-low-power, noise-critical portable electronics - emphasizing minimal IQ, high PSRR, and compact packaging for next-generation edge devices.

FAQ

What is the output voltage tolerance of the NCP103AMX100TCG over temperature?

The NCP103AMX100TCG maintains ±1% output voltage accuracy at room temperature (25°C). Over the full operating junction temperature range (−40°C to +85°C), the output voltage deviation is specified as ±40 mV for V_OUT ≤ 2.0 V - which corresponds to ±4% for the 1.0 V nominal output. This ensures stable biasing for precision analog circuits across environmental extremes.

Does the NCP103AMX100TCG support active output discharge, and how does it function?

Yes, the NCP103AMX100TCG includes active output discharge. When the EN pin voltage drops below 0.4 V, the internal discharge transistor activates, pulling the OUT pin to GND through a 100 Ω path. This feature is confirmed in the datasheet for all "A"-suffix variants like NCP103AMX100TCG and ensures rapid, controlled V_OUT decay - essential for safe power sequencing in multi-voltage-rail systems.

What is the minimum recommended output capacitor for stable operation of the NCP103AMX100TCG?

The NCP103AMX100TCG is stable with a minimum effective output capacitance of 0.22 µF, but the datasheet recommends a 1 µF X5R or X7R ceramic capacitor placed directly at the OUT pin. This value accounts for capacitance loss due to DC bias and temperature effects in small-case MLCCs (e.g., 0402), ensuring consistent loop stability and transient response across real-world operating conditions.

Can the NCP103AMX100TCG operate from a 1.7 V input supply while delivering 1.0 V output?

Yes, the NCP103AMX100TCG operates with input voltages from 1.7 V to 5.5 V. At 1.0 V output, its dropout voltage is proportional to V_OUT; while datasheet dropout values are given for higher outputs (e.g., 72 mV at 3.3 V), the architecture supports operation down to ~1.1 V input (1.0 V + ~100 mV overhead) - verified by characterization curves showing regulation at VIN = 1.7 V across temperature and load.

What thermal performance can be expected from the NCP103AMX100TCG on a standard PCB layout?

On a 1 oz FR-4 PCB with 645 mm² copper area, the NCP103AMX100TCG has a junction-to-ambient thermal resistance (R_JA) of 170°C/W. With a maximum junction temperature of 150°C and ambient of 25°C, this allows ~0.73 W maximum power dissipation - sufficient for 150 mA at 1.0 V output with up to 4.5 V input. Exposed pad soldering to GND is mandatory to achieve this rating.