onsemi NCP500SQL33T1G

Overview

NCP500SQL33T1G from onsemi is a fixed-output, CMOS low-dropout linear regulator delivering 3.3 V at up to 150 mA with ultra-low dropout (170 mV @ 150 mA), 2.5% output voltage accuracy, and 50 µV_RMS noise (10 Hz–100 kHz, no bypass capacitor required). It serves as a precision post-regulator in noise-sensitive RF and analog signal chains.

For engineers reviewing the NCP500SQL33T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its DFN 2×2.2 mm package, enable-compatible 1.0 V logic interface, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors ≥1.0 µF.

Technical Context

The NCP500SQL33T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and internal current/thermal limit circuitry - enabling stable regulation without external compensation. Its architecture eliminates need for noise-bypass capacitors while maintaining fast 20 µs enable turn-on response.

It operates across 1.8 V to 6.0 V input range, supports logic-level enable control (0.15 V low / 0.9 V high thresholds), and maintains regulation down to 2.0% V_OUT dropout - critical for single-cell Li-ion and multi-rail portable systems where headroom is constrained.

Key Specifications

Pinout & Package

Package: DFN 2×2.2 mm, 6-pin, exposed thermal pad (Case 506BA). Pin 6 is GND and shares thermal connection with the die paddle.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TLS850F3TAV50, the NCP500SQL33T1G delivers superior noise performance and lower dropout in a compact DFN, making it optimal for space-constrained, noise-sensitive portable and industrial applications where automotive qualification or sub-microamp I_Q are not required.

Availability

NCP500SQL33T1G is available at Aetrix Electronics and suitable for RF front-end modules, portable instrumentation, and industrial edge nodes requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for NCP500SQL33T1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP500 series is designed for portable battery-powered systems demanding low noise, fast enable response, and minimal dropout - targeting RF, sensor, and handheld equipment where power integrity and size are critical.

FAQ

What is the minimum input voltage required for NCP500SQL33T1G to maintain regulation?

The NCP500SQL33T1G maintains 3.3 V regulation down to a dropout of 170 mV at 150 mA load, meaning the minimum valid input voltage is 3.47 V under full load. At lighter loads (e.g., 1 mA), dropout drops to 2.0 mV, allowing operation as low as 3.302 V. Input must remain within the absolute max rating of 6.0 V.

Does NCP500SQL33T1G require an external bypass capacitor for noise reduction?

No. The NCP500SQL33T1G achieves 50 µV_RMS output noise (10 Hz–100 kHz) using an internal low-noise architecture - eliminating the need for an external bypass capacitor. This reduces component count, PCB area, and avoids potential startup delays associated with traditional LDO bypass networks.

Can NCP500SQL33T1G be used with ceramic output capacitors?

Yes. The NCP500SQL33T1G is stable with ceramic output capacitors ≥1.0 µF and imposes no minimum ESR requirement. This simplifies design, improves transient response, and avoids the size, cost, and aging concerns of tantalum or aluminum electrolytic alternatives.

What is the thermal shutdown threshold for NCP500SQL33T1G?

The NCP500SQL33T1G incorporates internal thermal protection that activates at approximately 160 °C junction temperature, disabling the output until the die cools below the hysteresis threshold. This safeguard prevents permanent damage during sustained overload or inadequate PCB thermal relief.

How does the enable pin of NCP500SQL33T1G interface with 1.0 V logic systems?

The NCP500SQL33T1G enable pin has a guaranteed turn-on threshold of 0.9 V and turn-off threshold of 0.15 V, making it fully compatible with 1.0 V logic families. No level-shifting is required - direct connection to MCU GPIO or FPGA I/O pins ensures reliable, low-latency control with 20 µs typical turn-on time.