onsemi NCP623MN-25R2G

Overview

NCP623MN-25R2G from onsemi is a 2.5 V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 150 mA with typical dropout voltage of 137 mV at 100 mA and output noise of 25 µVRMS (100 Hz–100 kHz, 10 nF bypass). It features logic-level ON/OFF control, thermal shutdown, short-circuit protection, and operates across −40°C to +85°C - ideal for battery-powered portable systems requiring stable, quiet power.

For engineers reviewing the NCP623MN-25R2G datasheet, pinout, applications, or equivalent options, key selection considerations include its 2.5 V fixed output, DFN6 3×3 mm package with exposed pad, 170 µA quiescent current in ON mode, −90 dB line regulation, and compatibility with ceramic output capacitors from 1.0 µF to unlimited ESR.

Technical Context

The NCP623MN-25R2G integrates a bandgap reference, error amplifier, and PMOS pass transistor in a single-chip LDO architecture. Its internal antisaturation circuitry enables ultra-low dropout and tight load regulation (20 mV at 150 mA), while the dedicated Bypass pin allows external 10 nF capacitor integration to reduce output noise to 25 µVRMS.

It employs a thermally robust design with junction-to-air thermal resistance of 161°C/W (DFN6, Case 488AE), internal thermal shutdown at 150°C, and current limiting at ≥175 mA. The ON/OFF input accepts TTL/CMOS logic levels (0.3 V low, 2.2 V high) and draws only 2.5 µA max input current.

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 PCBs with copper pour under the pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2502E/MB and TCS2117-250MWR, the NCP623MN-25R2G offers superior thermal performance (exposed pad, 161°C/W RJA), tighter load regulation (20 mV vs. ≥30 mV), and explicit AEC-Q100 readiness via NCV8623 family lineage - making it optimal for ruggedized portable and industrial designs where reliability and noise margin are co-prioritized.

Availability

NCP623MN-25R2G is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor networks, and industrial edge controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for NCP623MN-25R2G 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP623MN-25R2G belongs to onsemi's NCP623 low-noise LDO family, engineered specifically for battery-powered portable electronics where ultra-low noise, low quiescent current, and small-footprint packaging are essential for analog-sensitive subsystems.

FAQ

What is the maximum input voltage rating for the NCP623MN-25R2G?

The NCP623MN-25R2G has an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, the recommended input range is 2.5 V to 12 V, with sufficient headroom above the 2.5 V output to maintain regulation - e.g., ≥2.637 V minimum for 100 mA load given its 137 mV typical dropout.

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

Yes - the 25 µVRMS output noise (100 Hz–100 kHz) is achieved only when a 10 nF capacitor is connected to the Bypass pin (Pin 6). Without it, noise rises to 65 µVRMS. The device remains functional without the bypass capacitor, but designers must weigh the trade-off between noise performance (25 µVRMS) and startup time (1.1 ms with bypass vs. ~20 µs without).

Can the NCP623MN-25R2G be used with ceramic output capacitors, and what is the minimum value?

Yes - the NCP623MN-25R2G is explicitly designed for ceramic output capacitors, with stability guaranteed for values ≥1.0 µF and ESR from 0 to 3.0 Ω. This eliminates dependency on higher-ESR tantalum capacitors and simplifies layout. The datasheet confirms stability across temperature and load with 1.0 µF X7R ceramics, making it ideal for space-constrained portable designs.

What is the thermal shutdown threshold of the NCP623MN-25R2G, and how does it recover?

The NCP623MN-25R2G activates thermal shutdown at approximately 150°C junction temperature. Once triggered, the regulator disables output until the die cools sufficiently - typically by ≥20°C hysteresis - before automatically resuming regulation. This protects against catastrophic failure during sustained overload or poor PCB thermal design, and no external reset is required.

Is the NCP623MN-25R2G pin-compatible with other variants in the NCP623 family, such as the 3.3 V or 5.0 V versions?

Yes - all NCP623 variants (e.g., NCP623MN-33R2G, NCP623MN-50R2G) share identical DFN6 3×3 mm package, pinout, and footprint (Case 488AE). Only the output voltage differs (2.5 V, 2.8 V, 3.0 V, etc.), marked by the "yy" suffix in the part number. This enables drop-in voltage scaling during design iteration or multi-voltage system reuse without PCB changes.