Texas Instruments LMV641MF/NOPB

Overview

LMV641MF/NOPB from Texas Instruments is a low-power, rail-to-rail output operational amplifier optimized for battery-powered and portable systems. It delivers 10 MHz unity-gain bandwidth at only 138 µA supply current, features 500 µV max input offset voltage, 120 dB CMRR, and operates from 2.7 V to 12 V single or ±5 V dual supplies - enabling precision signal conditioning in sensor front-ends and portable instrumentation.

For engineers reviewing the LMV641MF/NOPB datasheet, LMV641MF/NOPB pinout, LMV641MF/NOPB application, or LMV641MF/NOPB equivalent, key selection criteria include its ultra-low quiescent current, wide supply range, rail-to-rail output swing within 40 mV of rails (at 2 kΩ), 14 nV/√Hz input voltage noise, and guaranteed −40°C to +125°C operation - all in a space-constrained SC70-5 package.

Technical Context

The LMV641MF/NOPB employs a unity-gain stable internal compensation architecture delivering 10 MHz gain-bandwidth product with 2.6 V/µs slew rate (rising) under ±5 V supply. Its input stage supports common-mode voltage down to the negative rail, enabling ground-sensing in single-supply configurations.

It achieves 105 dB PSRR and 120 dB CMRR across frequency, with flat 14 nV/√Hz input voltage noise up to 1 kHz and a low 1/f corner at 4 Hz - confirming suitability for DC-coupled, low-frequency precision amplification where offset drift and low-frequency noise must be minimized.

Key Specifications

Pinout & Package

LMV641MF/NOPB is packaged in a 5-pin SC70 (2.00 mm × 1.25 mm) surface-mount package optimized for board space and thermal performance in portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar operational amplifier applications.

Compared with MCP6001T-E/OT and TLV9001IDBVR, LMV641MF/NOPB uniquely combines 10 MHz bandwidth, 125°C rating, and 14 nV/√Hz noise in SC70-5 - making it the only option for high-fidelity, high-temperature, low-power signal chains where all three attributes are mandatory.

Availability

LMV641MF/NOPB is available at Aetrix Electronics and suitable for portable equipment, battery-powered systems, and sensors and instrumentation requiring stable component supply across industrial and automotive temperature grades.

Supply support for LMV641MF/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and low-power design.

The LMV641MF/NOPB belongs to TI's LMV low-voltage op amp family, engineered specifically for energy-constrained applications demanding high AC performance, rail-to-rail operation, and robust DC specifications across extended temperature ranges.

FAQ

What is the maximum capacitive load the LMV641MF/NOPB can drive without external compensation?

The LMV641MF/NOPB remains stable with capacitive loads up to 100 pF when driving a 2 kΩ load. For loads exceeding 100 pF - such as ADC input capacitance or long PCB traces - external in-the-loop compensation (e.g., series R_ISO and feedback C_F) is required to maintain phase margin above 45°. The datasheet provides validated RC values for CL up to 1 nF.

Does the LMV641MF/NOPB support true single-supply operation with input signals at ground potential?

Yes. The LMV641MF/NOPB features a common-mode input voltage range that includes the V− rail, allowing VIN− and VIN+ to operate at 0 V when V− = 0 V. This enables direct connection to ground-referenced sources like thermistors, RTDs, or bridge sensors without level-shifting circuitry - a key advantage over op amps with limited input range.

How does the 1/f noise corner at 4 Hz impact long-term measurement stability in the LMV641MF/NOPB?

A 4 Hz 1/f noise corner means low-frequency noise rolls off rapidly below this frequency, minimizing drift and flicker-induced errors in DC or sub-10 Hz measurements. In practice, this allows the LMV641MF/NOPB to maintain stable baseline readings over hours in portable medical monitors or environmental sensors - unlike micropower op amps with corners >100 Hz that exhibit significant low-frequency wander.

Can the LMV641MF/NOPB be used in a dual ±5 V supply configuration?

Yes. The LMV641MF/NOPB is fully specified for ±5 V operation (V+ = +5 V, V− = −5 V), with verified performance including 120 dB CMRR, 105 dB PSRR, and rail-to-rail output swing within 40 mV of ±5 V rails. Its input common-mode range extends from −5 V to +4.1 V, supporting full-range differential input operation in traditional dual-supply signal chains.

What is the thermal resistance (R_θJA) of the LMV641MF/NOPB in its SC70-5 package?

The LMV641MF/NOPB in the SC70-5 (DCK) package has a junction-to-ambient thermal resistance (R_θJA) of 456°C/W, as measured on a standard JEDEC 2-layer board. This value assumes standard PCB copper pour; adding thermal vias under the exposed pad (if present) or increasing copper area reduces effective R_θJA by up to 30%, critical for sustained 125°C operation in sealed enclosures.