onsemi NCP502SQ27T1

Overview

NCP502SQ27T1 from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 2.7 V at up to 80 mA with ultra-low 40 µA typical quiescent current, housed in SC70-5 package. It features PMOS pass transistor architecture, ±2.0% output voltage accuracy over −40 °C to +85 °C, and integrated thermal and current limiting protection - ideal for battery-powered handheld instruments requiring stable low-power bias.

For engineers reviewing the NCP502SQ27T1 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage (850 mV max at 80 mA), enable threshold compatibility (1.3 V high / 0.3 V low), ceramic capacitor stability (1.0 µF input/output), and SC70-5 thermal resistance (400 °C/W).

Technical Context

The NCP502SQ27T1 implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuitry - enabling stable regulation without external compensation. Its ultra-low quiescent current stems from optimized biasing of internal transistors, supporting >100-hour runtime in coin-cell–powered devices.

It operates across 2.7 V nominal output with input range up to 12 V, maintaining regulation down to 850 mV dropout at full 80 mA load and −40 °C to +85 °C ambient. Enable functionality provides logic-controlled shutdown with defined 1.3 V turn-on and 0.3 V turn-off thresholds, eliminating need for external level-shifting circuitry.

Key Specifications

Pinout & Package

Package: SC70-5 (Case 419A), 2.0 mm × 1.25 mm × 0.95 mm, Pb-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2702E/TT and TPS7A0527PDBVR, the NCP502SQ27T1 uniquely balances ultra-low I_Q, SC70-5 miniaturization, integrated enable, and robust industrial temperature range - making it optimal for space-constrained, long-life battery systems where controlled power gating is essential.

Availability

NCP502SQ27T1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld meters, wireless remote controls, and smart home sensor hubs requiring stable component supply with guaranteed long-term sourcing.

Supply support for NCP502SQ27T1 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.

The NCP502 series belongs to onsemi's low-power linear regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small footprint, and reliable operation across industrial temperature ranges.

FAQ

What is the maximum input voltage rating for the NCP502SQ27T1?

The NCP502SQ27T1 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 inputs to remain ≤12 V under all conditions including transient spikes, and ensure sufficient margin below this limit when used with unregulated sources such as batteries or DC/DC outputs.

Does the NCP502SQ27T1 require external capacitors, and what values are recommended?

Yes, the NCP502SQ27T1 requires both input (C_IN) and output (C_OUT) decoupling capacitors. The datasheet specifies 1.0 µF ceramic capacitors for both positions - e.g., TDK C1608X5R1A105K - placed as close as possible to the device pins. Larger values improve transient response and noise rejection, but 1.0 µF is the minimum for stability across all operating conditions.

How does the enable pin function on the NCP502SQ27T1, and what are its voltage thresholds?

The enable pin on the NCP502SQ27T1 controls regulator activation: pulling it ≥1.3 V (typical) turns the device on, while pulling it ≤0.3 V (typical) disables output and reduces quiescent current to 0.1 µA. If unused, the pin must be tied to Vin. This logic-level interface allows direct GPIO control without external level shifters or pull-up resistors, simplifying low-power system design.

Is the NCP502SQ27T1 compatible with ceramic output capacitors, and why does that matter?

Yes, the NCP502SQ27T1 is fully stable with low-ESR ceramic capacitors (1.0 µF minimum), unlike many older LDOs requiring specific ESR ranges. This eliminates reliance on bulkier, less reliable tantalum or aluminum electrolytic capacitors - reducing board area, cost, and failure risk while improving transient response and long-term reliability in portable applications.

What thermal limitations apply to the NCP502SQ27T1 in SC70-5 package?

In SC70-5 package, the NCP502SQ27T1 has a junction-to-air thermal resistance (R_JA) of 400 °C/W under standard test conditions (1 oz copper, 100 mm² pad). At 80 mA load with 12 V input, power dissipation reaches ~750 mW - exceeding safe limits. Derate output current or reduce input voltage accordingly; for sustained 80 mA operation, keep Vin ≤5.5 V or add thermal relief to maintain T_J <125 °C.