Texas Instruments LP3964EMP-3.3/NOPB

Mfr. Part

LP3964EMP-3.3/NOPB

Manufacturer

Luminary Micro / Texas Instruments

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Detailed Description

3.3 V fixed-output, positive low-dropout (LDO) linear regulator

Up to 800 mA continuous output current

Low dropout: 0.35 V max at 800 mA (run with tight input-to-output headroom)

Input voltage up to 7 V (not for 12 V rails without pre-regulation)

Enable control for easy power sequencing and shutdown

Robust protections: over-current, over-temperature, and short-circuit

Industrial temperature range: -40°C to +125°C

Surface-mount SOT-223-5 (also referred to as TO-261-5, TO-261AB)

RoHS3 compliant

Base product number: LP3964

Key Features

Output voltage: 3.3 V fixed, positive regulation

Output current: 800 mA

Dropout voltage: 0.35 V max at 800 mA

Input voltage: up to 7 V

Enable pin for on/off control

Quiescent current: 9 mA typical

Supply current (max): 15 mA

Single regulator channel

Protections: over-current limit, thermal shutdown, short-circuit

Operating temperature: -40°C to +125°C

Mounting: surface mount

Package: SOT-223-5 (TO-261-5/TO-261AB)

Compliance: RoHS3

Supplier device package: SOT-223-5

Shipment: Tape & Reel (TR)

Key Advantages

Stable 3.3 V rail with strong 800 mA drive for MCUs, FPGAs, sensors, radios, and logic

Low dropout reduces wasted power and heat, enabling use with near-headroom inputs

Built-in protections enhance reliability in demanding environments

Enable pin cuts standby power and simplifies sequencing

Compact SOT-223 footprint simplifies layout and saves PCB space

Simple, cost-effective linear regulation with low noise and fast response compared to many alternatives

Packaging

Shipment type: Tape & Reel (TR) for automated assembly

Package case: SOT-223-5 (also known as TO-261-5, TO-261AB)

Material: molded epoxy package with integral metal tab for heat spreading

Approximate size: SOT-223 body around 6.5 mm x 3.5 mm (tab extends beyond body; check datasheet for exact dimensions)

Pin configuration (typical for 5-pin SOT-223 LDOs): VIN, VOUT, GND, EN (Enable), BP/NR (bypass/noise-reduction) — confirm exact pin names in the datasheet before layout

Thermal characteristics: thermal performance depends strongly on copper area under the tab; use large copper planes and thermal vias to lower RθJA and support 800 mA; device includes internal thermal shutdown

Electrical properties summary: 3.3 V fixed output; 800 mA max load; 0.35 V max dropout at 800 mA; Iq ~9 mA typical; input up to 7 V; protections for OCP/OTP/short

Lifecycle

Current market status: widely available and commonly used. Availability can vary by region and date.

Not known to be near discontinuation at the time of writing. Always verify current status on our website.

Equivalent or alternative models to consider (verify pinouts, dropout, and thermal limits):

- Texas Instruments TPS79633 (1 A, low dropout, different pinout/package options)

- Texas Instruments TLV1117-33 / LM1117-3.3 (1 A, higher dropout, very common)

- Analog Devices ADP3338-3.3 (1 A, low dropout)

- Analog Devices LT1963A-3.3 (up to 1.5 A, low dropout)

- Microchip MCP1826S-3302 (1 A)

- onsemi NCP1117ST33 (1 A)

- Diodes Incorporated AP7365-33 (up to 1.5 A)

If you need a direct, footprint-compatible substitute or do not see a suitable equivalent, contact our sales team via the Y-IC website for tailored recommendations.

Key Application Areas

Post-regulation after DC/DC converters to clean up ripple on 3.3 V rails

Embedded systems and microcontroller boards (3.3 V logic supplies)

FPGAs, DSPs, and high-speed digital IC rails

IoT gateways, communications modules, and RF sections needing low-noise 3.3 V

Industrial control and instrumentation with -40°C to +125°C temperature needs

Consumer electronics, set-top boxes, home networking, storage devices

Displays, sensors, and peripheral rails where simple, reliable 3.3 V regulation is preferred

Datasheet

Y-IC hosts the most authoritative datasheet and technical documentation for LP3964EMP-3.3/NOPB on our product page. Download the datasheet on this page to get exact pinouts, dimensions, thermal data, and design guidelines.

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