onsemi NCP502SQ33T1

Overview

NCP502SQ33T1 from onsemi is a fixed-output, low-quiescent-current CMOS LDO voltage regulator delivering 3.3 V at up to 80 mA output current in SC70-5 package. It features 40 µA typical quiescent current, ±2.0% output voltage accuracy over −40 °C to +85 °C, and ultra-low dropout of 850 mV at 80 mA - optimized for battery-powered handheld instruments and portable consumer electronics.

For engineers reviewing the NCP502SQ33T1 datasheet, pinout, applications, or equivalent options, key selection criteria include enable threshold compatibility (1.3 V high / 0.3 V low), ceramic-capacitor stability, thermal performance in SC70-5 (R_JA = 400 °C/W), and industrial-grade temperature operation without derating.

Technical Context

The NCP502SQ33T1 integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuits (current limit, thermal shutdown). Its enable input supports logic-level control with defined turn-on/turn-off thresholds, and it operates stably with 1.0 µF ceramic output capacitors - eliminating ESR requirements common in older LDO architectures.

Designed for low-noise, low-power systems, the device achieves 55 dB ripple rejection at 1 kHz and 180 µV_rms output noise (100 Hz–100 kHz). Dropout behavior is characterized across temperature and load, with worst-case 850 mV at 80 mA and 3.3 V output - enabling operation from as low as 4.15 V input under full load at elevated ambient.

Key Specifications

Pinout & Package

SC70-5 surface-mount package (Case 419A), 5-pin, Pb-free, micro-miniature outline measuring 2.0 mm × 1.25 mm × 0.95 mm. Thermal resistance R_JA = 400 °C/W (1 oz Cu, 100 mm² spread area).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TCS2117-33IDBVR, the NCP502SQ33T1 provides optimal balance of ultra-low I_Q, integrated enable with defined thresholds, thermal protection, and SC70-5 size - making it uniquely suited for space- and battery-life-constrained portable designs where all three features are simultaneously required.

Availability

NCP502SQ33T1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld meters, and wireless remote controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP502SQ33T1 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 sensing technologies.

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

FAQ

What is the maximum input voltage rating for the NCP502SQ33T1?

The NCP502SQ33T1 has an absolute maximum input voltage (Vin) rating of 12 V, as specified in the Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term use, design input rails to stay within 12 V - including transient spikes - and consider input clamping or filtering if sourced from unregulated supplies like batteries with charging circuits.

Does the NCP502SQ33T1 require an external output capacitor, and what type is recommended?

Yes, the NCP502SQ33T1 requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed adjacent to the Vout and GND pins. This capacitor ensures stability, improves load transient response, and reduces output noise. TDK part numbers C2012X5R1C105K or C1608X5R1A105K are validated in the datasheet. Tantalum capacitors are also acceptable but offer no advantage over low-ESR ceramics.

Can the NCP502SQ33T1 be used with a 1.8 V microcontroller GPIO to control the Enable pin?

Yes, the NCP502SQ33T1 Enable pin has a guaranteed turn-on threshold of ≥1.3 V and turn-off threshold of ≤0.3 V, making it fully compatible with 1.8 V logic outputs. When the GPIO drives high (≥1.8 V), the regulator enables; when driven low (0 V), it disables. No level shifter is needed, and the pin draws negligible current (<100 nA) in either state.

What is the thermal performance of the NCP502SQ33T1 in its SC70-5 package?

The NCP502SQ33T1 in SC70-5 has a junction-to-ambient thermal resistance (R_JA) of 400 °C/W under standard test conditions (1 oz Cu, 100 mm² spread area). At 80 mA load and 5 V input, power dissipation is ~136 mW, resulting in ~54 °C junction rise above ambient. To maintain safe operation below 150 °C max junction temperature, keep ambient below ~96 °C - or reduce load/current in high-temp environments.

Is the NCP502SQ33T1 still in active production, or has it been discontinued?

The NCP502SQ33T1 is marked as discontinued in the official onsemi datasheet (Rev. 23, April 2026), per the Ordering Information table on page 7. However, Aetrix Electronics maintains legacy inventory and offers lifecycle management support - including last-time-buy planning, cross-reference assistance, and qualified alternatives - for customers transitioning from this part.