onsemi NCP502SQ30T1G

Overview

NCP502SQ30T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 3.0 V at up to 80 mA with 40 µA typical quiescent current and 850 mV typical dropout voltage at 80 mA. It integrates PMOS pass transistor, thermal shutdown, current limiting, and enable control - designed for battery-powered portable electronics requiring stable low-power supply rails.

For engineers reviewing the NCP502SQ30T1G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low IQ (40 µA), SC70-5 package footprint, ±2.0% output accuracy over −40 °C to +85 °C, enable threshold compatibility (1.3 V high / 0.3 V low), and ceramic capacitor stability (1.0 µF input/output).

Technical Context

The NCP502SQ30T1G employs a PMOS pass transistor architecture enabling low dropout and near-zero ground current increase under load. Its internal error amplifier maintains regulation with <0.8 mV/mA load regulation and <3.0 mV/V line regulation, supporting operation from 1.0 V above nominal output (i.e., Vin ≥ 4.0 V) up to 12 V input.

Thermal protection activates at ~160 °C junction temperature, and the device achieves 55 dB ripple rejection at 1 kHz. It operates without minimum load requirement and accepts output capacitors with ESR from a few mΩ to 5.0 Ω - compatible with standard 1.0 µF ceramic decoupling.

Key Specifications

Pinout & Package

Package: SC70-5 (Case 419A), 1.25 mm × 1.65 mm × 0.95 mm, Pb-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3002E/TT and TCS2113-3.0, the NCP502SQ30T1G uniquely balances ultra-low IQ (40 µA), enable functionality, thermal/current protection, and SC70-5 size - making it optimal for space-constrained, battery-sensitive industrial and portable designs where full-feature integration matters.

Availability

NCP502SQ30T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, and industrial handheld scanners requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for NCP502SQ30T1G 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, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The NCP502 series belongs to onsemi's precision analog LDO portfolio, engineered specifically for ultra-low-power, small-footprint battery-powered systems where quiescent current, thermal robustness, and ceramic capacitor compatibility are critical design constraints.

FAQ

What is the maximum input voltage rating for the NCP502SQ30T1G?

The NCP502SQ30T1G 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 performance, design with Vin ≤ 12 V and ensure transient spikes remain within −0.3 V to Vin + 0.3 V per the Enable and Output Voltage ratings. The device delivers optimal regulation when Vin is ≥ 4.0 V (i.e., ≥ Vout + 1.0 V).

Does the NCP502SQ30T1G require an external output capacitor, and what type is recommended?

Yes, the NCP502SQ30T1G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed close to the Vout and GND pins. This capacitor ensures stability, improves load transient response, and reduces output noise. The regulator is explicitly designed for ceramic capacitors and tolerates ESR from a few mΩ up to 5.0 Ω - eliminating need for tantalum or aluminum electrolytic types.

What is the dropout voltage of the NCP502SQ30T1G at 80 mA load and how does it vary with temperature?

The NCP502SQ30T1G exhibits a typical dropout voltage of 850 mV at 80 mA load and 25 °C. As shown in Figure 10 of the datasheet, dropout increases slightly with rising temperature - reaching ~900 mV at 85 °C. This behavior is consistent across the 3.0 V variant and reflects PMOS pass transistor characteristics; design must ensure Vin remains ≥ Vout + dropout across full operating temperature range.

Can the NCP502SQ30T1G be used without connecting the Enable pin?

Yes - the NCP502SQ30T1G can operate without external enable control. If the Enable pin is unused, it must be tied directly to Vin to guarantee the regulator remains active. Leaving Enable floating is not recommended, as leakage or noise could cause unintended shutdown. The internal enable threshold is 1.3 V (turn-on) and 0.3 V (turn-off), making it compatible with standard GPIO outputs.

Is the NCP502SQ30T1G suitable for automotive applications?

No - the NCP502SQ30T1G is rated for industrial temperature range (−40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive use, select the NCV502SN30T1G variant, which carries the NCV prefix, meets AEC-Q100 Grade 1 requirements (−40 °C to +125 °C), and is PPAP capable. The NCP502SQ30T1G is intended for consumer, industrial, and portable equipment only.