onsemi NCP623MN-40R2G

Overview

NCP623MN-40R2G from onsemi is a 4.0 V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 150 mA output current with 137 mV typical dropout at 100 mA, 25 µV_RMS output noise (100 Hz–100 kHz) with 10 nF bypass capacitor, and −90 dB line regulation - designed for battery-powered portable systems requiring stable, clean power under tight space and noise constraints.

For engineers reviewing the NCP623MN-40R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.0 V output accuracy (±2.5% over temperature), 170 µA quiescent current in ON state, DFN6 3×3 mm package with exposed thermal pad, TTL/CMOS-compatible ON/OFF control, and support for ceramic output capacitors with ESR up to 3.0 Ω.

Technical Context

The NCP623MN-40R2G integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a single-stage LDO architecture optimized for ultra-low noise and fast transient response. Its internal bypass node enables external 10 nF capacitor filtering to suppress broadband noise without compromising stability.

It features logic-level ON/OFF control with 2.5 µA input current and 0.3 V/2.2 V logic thresholds, thermal shutdown at 150°C, short-circuit current limiting (175–210 mA), and operates across −40°C to +85°C ambient. The device maintains regulation down to 180 mV dropout at full 150 mA load and achieves 1.0 mV line transient overshoot under 15 mV/µs input ramp.

Key Specifications

Pinout & Package

Package: DFN6 (3 mm × 3 mm, 0.75 mm height), Case 488AE, MN suffix, Pb-free, with exposed thermal pad (pin 5). Designed for high thermal efficiency on standard PCBs with 2-layer copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-4002E/MB and XC6206P402MR-G, the NCP623MN-40R2G delivers superior noise performance (25 µV_RMS), lower dropout (137 mV), and integrated bypass filtering - making it optimal for high-precision analog and RF subsystems where power integrity is critical.

Availability

NCP623MN-40R2G is available at Aetrix Electronics and suitable for portable medical sensors, wireless audio transceivers, industrial handheld scanners, and automotive cabin sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for NCP623MN-40R2G 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 (formerly ON Semiconductor) is a global semiconductor leader focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCP623MN-40R2G belongs to onsemi's ultra-low-noise LDO family, engineered specifically for noise-sensitive portable and battery-powered systems where clean, stable, and efficient voltage regulation is essential.

FAQ

What is the output voltage tolerance of the NCP623MN-40R2G over temperature and load?

The NCP623MN-40R2G delivers 4.0 V with ±2.5% tolerance across −40°C to +85°C ambient temperature and 1.0 mA to 150 mA load current. At 25°C and 60 mA load, typical output is 3.92–4.08 V; min/max values remain within specification across full operating range per datasheet Table 1.

Does the NCP623MN-40R2G require an external bypass capacitor to achieve its 25 µV_RMS noise specification?

Yes - the 25 µV_RMS noise figure (100 Hz–100 kHz) is achieved only when a 10 nF capacitor is connected to the Bypass pin (pin 6). Without it, output noise rises to 65 µV_RMS. The bypass capacitor is optional but mandatory for ultra-low-noise applications such as precision ADC references or RF synthesizer supplies.

Can the NCP623MN-40R2G operate with ceramic output capacitors having zero ESR?

Yes - the NCP623MN-40R2G is explicitly designed to remain stable with ceramic output capacitors exhibiting ESR from 0 Ω up to 3.0 Ω. This eliminates the need for series resistors or specialized low-ESR tantalum capacitors, simplifying design and reducing BOM cost and count.

What thermal performance can be expected from the NCP623MN-40R2G in a standard 2-layer PCB layout?

In a standard 2-layer PCB with 1 in² copper pour connected to the exposed thermal pad (pin 5), the NCP623MN-40R2G achieves R_θJA ≈ 161°C/W. At 150 mA load and 5.0 V input (1.0 V dropout), power dissipation is ~150 mW, resulting in ~24°C junction-to-ambient rise - well below the 150°C thermal shutdown threshold.

Is the NCP623MN-40R2G pin-compatible with other variants in the NCP623 family?

Yes - all NCP623 variants (e.g., NCP623MN-25R2G, NCP623MN-33R2G) share identical DFN6 3×3 mm package, pinout, and electrical interface. Only the output voltage differs; no PCB redesign is needed when swapping between 2.5 V, 2.8 V, 3.0 V, 3.3 V, 4.0 V, or 5.0 V versions.