onsemi NCP502SQ25T1G

Overview

NCP502SQ25T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 2.5 V at up to 80 mA with 40 µA typical quiescent current and 2.0% output voltage accuracy. It features PMOS pass transistor architecture, thermal shutdown, current limiting, and operates across −40 °C to +85 °C - designed for battery-powered portable electronics requiring stable low-power regulation.

For engineers reviewing the NCP502SQ25T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1000 mV max at 80 mA), enable threshold compatibility (1.3 V high / 0.3 V low), SC70-5 package footprint, and ceramic capacitor stability - all critical for space-constrained, low-I_Q designs.

Technical Context

The NCP502SQ25T1G implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuits including thermal shutdown and current limit. Its ultra-low 40 µA quiescent current enables multi-day operation in standby modes of handheld devices.

It achieves 2.0% initial output accuracy over temperature (−40 °C to +85 °C) and maintains regulation with input voltages up to 12 V, while supporting ceramic output capacitors ≥1.0 µF without ESR constraints - eliminating need for tantalum or aluminum electrolytics.

Key Specifications

Pinout & Package

Package: SC70-5 (Case 419A), 1.25 mm × 2.1 mm × 0.95 mm, Pb-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the NCP502SQ25T1G offers balanced performance: integrated enable and protection, industry-standard SC70-5 footprint, and verified 2.5 V stability across −40 °C to +85 °C - making it optimal for production-ready portable designs needing reliability and layout simplicity.

Availability

NCP502SQ25T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart home remote sensors requiring stable component supply with long-term manufacturability.

Supply support for NCP502SQ25T1G 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 supplier focused on energy-efficient electronics, with leadership in power management, analog, and sensor technologies.

The NCP502SQ25T1G belongs to the NCP502 series of low-I_Q CMOS LDO regulators, engineered specifically for battery-powered portable equipment demanding ultra-low standby current and small-footprint integration.

FAQ

What is the maximum input voltage rating for the NCP502SQ25T1G?

The NCP502SQ25T1G has an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent device damage. For reliable long-term use, design input rails to stay within 2.8 V to 12 V - sufficient to cover single Li-ion (3.0–4.2 V) or dual alkaline (up to 3.2 V) sources with margin.

Does the NCP502SQ25T1G require an external output capacitor, and what type is recommended?

Yes, the NCP502SQ25T1G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed close to the Vout and GND pins. Unlike older LDOs, it imposes no ESR requirement - enabling use of low-cost, high-reliability MLCCs instead of tantalum. Larger values (e.g., 4.7 µF) improve load transient response and noise filtering.

What is the dropout voltage of the NCP502SQ25T1G at full 80 mA load?

The dropout voltage of the NCP502SQ25T1G is 1000 mV maximum at 80 mA load and −40 °C to +85 °C ambient, measured when Vout drops 3.0% below nominal (i.e., to 2.425 V). At 25 °C and 10 mA, typical dropout is lower (~600 mV), but system design must accommodate the worst-case 1000 mV to ensure regulation across temperature and lifetime.

Can the enable pin of the NCP502SQ25T1G be left floating?

No - the enable pin must not be left floating. Per the datasheet, if unused, it must be connected directly to Vin to guarantee turn-on. Floating the enable pin risks unpredictable behavior due to noise coupling or internal leakage, potentially causing intermittent regulation failure. A pull-up resistor to Vin is acceptable but direct connection is preferred for lowest leakage.

Is the NCP502SQ25T1G RoHS-compliant and halogen-free?

Yes, the NCP502SQ25T1G is Pb-free and RoHS-compliant, as confirmed by its "G" suffix and explicit statement in the datasheet ("These are Pb-Free Devices"). It meets JEDEC JS709B and IPC-1752A requirements for halogen-free materials (Cl ≤ 900 ppm, Br ≤ 900 ppm), making it suitable for environmentally regulated consumer and industrial markets.