onsemi NCP511SN33T1G

Overview

NCP511SN33T1G from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 3.3 V at up to 150 mA with 40 µA typical quiescent current and 100 mV dropout at 100 mA - designed for battery-powered portable electronics requiring ultra-low power consumption and stable regulation under light-to-moderate load.

For engineers reviewing the NCP511SN33T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its TSOP-5 package footprint, enable-controlled standby mode, ±2.0% output accuracy over −40°C to +85°C, compatibility with 1.0 µF ceramic output capacitors, and thermal shutdown protection.

Technical Context

The NCP511SN33T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and protection circuitry (current limit and thermal shutdown) in a single monolithic IC. Its architecture enables stable operation with minimal external components and eliminates ESR dependency for output capacitance.

It features an active-high Enable input that places the device into ultra-low-quiescent-current standby (<0.1 µA) when pulled low, and supports input voltages from 0 V to 6.0 V with regulated 3.3 V output. Line regulation is 1.0–3.5 mV/V and load regulation is 0.3–0.8 mV/mA, ensuring tight output stability across operating conditions.

Key Specifications

Pinout & Package

The NCP511SN33T1G is housed in a Pb-free TSOP-5 surface-mount package (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TCS2113-330MWR, the NCP511SN33T1G offers superior enable control granularity and tighter output accuracy (±2.0% vs. ±2.5%), making it optimal for battery-sensitive, thermally constrained, and digitally managed power domains.

Availability

NCP511SN33T1G is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, portable test equipment, and smart home edge controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for NCP511SN33T1G 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 NCP511 series belongs to onsemi's low-I_Q LDO portfolio, engineered specifically for battery-powered portable electronics where extended runtime, small form factor, and robust protection are critical design requirements.

FAQ

What is the maximum input voltage rating for the NCP511SN33T1G?

The NCP511SN33T1G has a maximum input voltage rating of 6.0 V, as specified in its Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage. For applications with higher input sources (e.g., 12 V rails), an external pre-regulator stage is required - as demonstrated in Figure 22 of the official datasheet - to ensure Vin remains within the 0–6.0 V operating range of the NCP511SN33T1G.

Does the NCP511SN33T1G require a minimum output capacitor, and what type is recommended?

Yes, the NCP511SN33T1G requires a minimum 1.0 µF ceramic output capacitor placed close to the Vout and GND pins for stability. The datasheet confirms compatibility with low-ESR ceramics (including X5R/X7R) and tantalum capacitors, with no ESR constraints. Larger values (e.g., 10 µF) improve load transient response and noise rejection, but are not mandatory for basic regulation.

How does the Enable pin function on the NCP511SN33T1G, and what is its threshold voltage?

The Enable pin on the NCP511SN33T1G is active-high: pulling it below 0.3 V disables the regulator (reducing quiescent current to <0.1 µA), while driving it above 1.3 V enables normal operation. If unused, the pin must be tied directly to Vin - not left floating - to guarantee reliable startup and avoid erratic behavior due to noise coupling.

What protection features are integrated into the NCP511SN33T1G?

The NCP511SN33T1G integrates three core protections: current limiting (800 mA short-circuit current limit), thermal shutdown (activates at ~160°C junction temperature), and input overvoltage tolerance up to 6.0 V. It also features ESD protection exceeding 2000 V HBM. These functions operate autonomously without external components, enhancing system robustness in unattended or harsh environments.

Is the NCP511SN33T1G suitable for automotive applications?

The NCP511SN33T1G is not qualified for automotive use. However, its pin-compatible variant NCV511SN33T1G is AEC-Q100 qualified and PPAP capable - explicitly designed for automotive and other high-reliability applications requiring controlled change management and unique site traceability. For automotive designs, NCV511SN33T1G must be selected instead of NCP511SN33T1G.