onsemi NCP103AMX330TCG

Overview

NCP103AMX330TCG from onsemi is a 150 mA CMOS low-dropout linear regulator with fixed 3.3 V output, ±1% accuracy at room temperature, 75 mV typical dropout at 150 mA, and active output discharge function. It operates from 1.7 V to 5.5 V input and delivers ultra-low quiescent current (50 µA typ.) for battery-powered portable electronics requiring stable, low-noise voltage regulation.

For engineers reviewing the NCP103AMX330TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its uDFN4 1.0×1.0 mm package, EN-controlled shutdown with 0.1 µA standby current, 75 dB PSRR at 1 kHz, stability with 1 µF ceramic output capacitor, and thermal/current protection features.

Technical Context

The NCP103AMX330TCG integrates a PMOS pass transistor with dynamic quiescent current adjustment to minimize IQ across load conditions. Its internal bandgap reference and error amplifier enable ±1% output accuracy over −40°C to +85°C junction temperature.

It features an active output discharge transistor (100 Ω typical) activated during shutdown, enabling rapid VOUT ramp-down. Protection circuitry includes thermal shutdown (160°C trip, 20°C hysteresis) and foldback current limiting (550 mA typ.), ensuring robust operation under overload or short-circuit conditions.

Key Specifications

Pinout & Package

Package: uDFN4 (1.0 × 1.0 mm, 0.65 mm pitch, Case 517CU), Pb-free, RoHS-compliant, with exposed thermal pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/TT and XC6206P332MR-G, the NCP103AMX330TCG uniquely combines active output discharge, 75 dB PSRR, and integrated thermal/current protection in a 1.0×1.0 mm footprint-making it optimal for space-constrained, safety-aware portable designs requiring fast shutdown behavior and noise immunity.

Availability

NCP103AMX330TCG is available at Aetrix Electronics and suitable for smartphone power management, wireless sensor nodes, portable medical monitors, and industrial handheld terminals requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for NCP103AMX330TCG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The NCP103 series is designed specifically for battery-powered portable electronics, emphasizing ultra-low quiescent current, small-footprint packaging, and integrated protection to simplify power architecture in space- and power-constrained devices.

FAQ

What is the output voltage tolerance of the NCP103AMX330TCG over temperature?

The NCP103AMX330TCG provides ±2% output voltage accuracy across the full operating junction temperature range of −40°C to +85°C. At room temperature (25°C), it achieves tighter ±1% accuracy. This specification ensures reliable 3.3 V rail generation for logic interfaces and analog subsystems without requiring external trimming or calibration in most portable applications.

Does the NCP103AMX330TCG require an external capacitor on the EN pin?

No, the NCP103AMX330TCG does not require an external capacitor on the EN pin. Its EN input has an internal 300 nA pull-down current source, ensuring reliable disable state when left floating. For noise immunity in electrically noisy environments, a small RC filter (e.g., 10 kΩ + 100 pF) may be added-but it is not required for basic functionality or stability of the NCP103AMX330TCG.

Can the NCP103AMX330TCG operate with a 1.8 V input supply?

No, the NCP103AMX330TCG cannot regulate 3.3 V output from a 1.8 V input. Its minimum operating input voltage is 1.7 V, but the dropout voltage at 150 mA is 65–110 mV - meaning VIN must be ≥3.365 V to maintain regulation. Attempting to use 1.8 V input will result in unregulated, drooping output and potential device instability. The NCP103AMX330TCG requires VIN ≥3.365 V for full 3.3 V output capability.

What is the purpose of the exposed pad (EPAD) on the NCP103AMX330TCG package?

The exposed pad on the NCP103AMX330TCG is a thermal and electrical connection that must be soldered directly to the PCB's GND plane. It reduces thermal resistance (R_θJA) by up to 30%, improves heat dissipation during sustained 150 mA loads, and enhances electrical stability by lowering ground impedance. Leaving the EPAD unconnected degrades thermal performance and risks junction overheating above 125°C under typical operating conditions.

How does the active output discharge feature work in the NCP103AMX330TCG?

In the NCP103AMX330TCG, when the EN pin voltage falls below 0.4 V, the internal active discharge transistor turns on, connecting the OUT pin to GND through a 100 Ω path. This rapidly discharges the output capacitor, preventing residual voltage from back-powering downstream circuitry or causing undefined logic states during system reset. The feature is exclusive to "A" suffix variants like the NCP103AMX330TCG and is absent in "B" versions.