onsemi NCP103AMX105TCG

Overview

NCP103AMX105TCG from onsemi is a 150 mA CMOS low-dropout linear regulator with fixed 1.05 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 VOUT = 3.3 V), and 75 dB PSRR at 1 kHz - enabling stable power for RF and analog circuitry in portable electronics.

For engineers reviewing the NCP103AMX105TCG 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), thermal shutdown protection, and compatibility with 1 µF ceramic output capacitors in the uDFN4 1.0×1.0 mm package.

Technical Context

The NCP103AMX105TCG employs a PMOS pass transistor architecture with dynamic quiescent current adjustment to minimize IQ across load conditions. Its enable logic supports clean ON/OFF control with 0.9 V high-threshold and 0.4 V low-threshold, while integrated active discharge (RDIS = 100 Ω) rapidly pulls VOUT to GND during shutdown.

Designed for robust operation under transient stress, it features current limiting (550 mA typ.), thermal shutdown at 160°C with 20°C hysteresis, and stability with minimal 0.22 µF effective output capacitance - accommodating DC-bias derating of small-case MLCCs like 0402.

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/TT and XC6210B102MR-G, the NCP103AMX105TCG uniquely combines 150 mA capability, 1.05 V precision, and integrated active discharge in a 1.0×1.0 mm footprint - making it optimal for space-constrained, multi-rail battery systems requiring deterministic shutdown behavior.

Availability

NCP103AMX105TCG is available at Aetrix Electronics and suitable for wearable health sensors, BLE wireless modules, and industrial IoT edge nodes requiring stable component supply with full lifecycle support.

Supply support for NCP103AMX105TCG 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 NCP103AMX105TCG belongs to onsemi's precision LDO family designed specifically for ultra-low-power, noise-sensitive portable electronics - emphasizing quiescent current optimization, small-package stability, and integrated protection features.

FAQ

What is the output voltage tolerance of the NCP103AMX105TCG over temperature?

The NCP103AMX105TCG maintains ±1% output voltage accuracy at room temperature. Over the full operating junction temperature range (−40°C to +85°C), output deviation is specified as ±40 mV for VOUT ≤ 2.0 V - which corresponds to ±3.8% for the 1.05 V nominal output. This ensures reliable operation in consumer and industrial environments without external trimming.

Does the NCP103AMX105TCG support active output discharge, and how does it function?

Yes, the NCP103AMX105TCG includes active output discharge. When the EN pin is driven below 0.4 V, an internal 100 Ω resistor connects the OUT pin to GND, discharging the output capacitor rapidly. This feature is confirmed in the datasheet for all "A"-suffix variants like NCP103AMX105TCG and prevents floating voltages during power-down sequences.

What is the minimum output capacitance required for stability with the NCP103AMX105TCG?

The NCP103AMX105TCG is stable with a minimum effective output capacitance of 0.22 µF - accounting for DC-bias and temperature derating of ceramic capacitors. A 1 µF X7R/X5R MLCC is recommended for robust performance, especially with 0402-size parts where capacitance loss at rated voltage is significant.

Can the NCP103AMX105TCG operate from a 1.2 V input supply?

No. The NCP103AMX105TCG requires a minimum input voltage of 1.7 V per its Absolute Maximum Ratings and Electrical Characteristics. With a 1.05 V output and typical dropout of ~125 mV at 150 mA, the minimum functional input is approximately 1.175 V - but the device will not enable or regulate below VIN = 1.7 V due to internal bandgap and control circuit constraints.

Is the NCP103AMX105TCG RoHS compliant and lead-free?

Yes, the NCP103AMX105TCG is Pb-free, halogen-free/BFR-free, and RoHS compliant. This is explicitly stated in the datasheet Features section and confirmed in the Ordering Information table, where "(Pb-Free)" is noted for the uDFN4 package variant.