Texas Instruments LMV981MF

Overview

LMV981MF from Texas Instruments is a single-channel, rail-to-rail input/output (RRIO) operational amplifier optimized for 1.8-V operation, delivering 1.4-MHz gain bandwidth, 100-µA supply current per channel, and output swing within 80 mV of the rail into 600 Ω - ideal for battery monitoring and low-voltage portable audio signal conditioning.

For engineers reviewing the LMV981MF datasheet, LMV981MF pinout, LMV981MF application, or LMV981MF equivalent, this page provides verified package mapping (SC70-6), shutdown timing (19 µs turnon), rail-to-rail common-mode range (−0.2 V to V₊ + 0.2 V), and real-world design meaning for key specs including output drive capability, noise, and thermal performance.

Technical Context

The LMV981MF implements a CMOS input stage enabling rail-to-rail input common-mode voltage (down to −0.2 V below V₋ and up to V₊ + 0.2 V), paired with an AB-class output stage supporting 600-Ω loads at 1.8 V while maintaining 101-dB DC gain and 0.35-V/µs slew rate.

Its independent shutdown pin (SHDN) reduces quiescent current to ≤1 µA, and the device remains stable driving up to 1000-pF capacitive loads - critical for sensor interface and ADC driver applications where low power and signal integrity coexist.

Key Specifications

Pinout & Package

LMV981MF is packaged in SC70-6 (DCK), a 2.00 mm × 1.25 mm surface-mount package with 0.65-mm lead pitch. This compact footprint supports high-density PCB layouts in space-constrained wearables and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar op-amp applications.

Compared with TLV9001IDBVR and OPA316IDBVR, LMV981MF uniquely balances ultra-low power (103 µA), fast shutdown wake-up (19 µs), and rail-to-rail operation at 1.8 V - making it optimal for energy-constrained, single-cell systems requiring both precision and responsiveness.

Availability

LMV981MF is available at Aetrix Electronics and suitable for battery monitoring, wearable sensor interfaces, and portable audio line drivers requiring stable component supply across automotive-grade temperature ranges (−40°C to 125°C).

Supply support for LMV981MF 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 signal chain solutions.

The LMV981MF belongs to TI's LMV98x-N family of small-footprint, low-voltage op-amps designed specifically for battery-powered portable electronics where rail-to-rail operation, sub-100-µA quiescent current, and robust capacitive load drive are mandatory.

FAQ

What is the maximum capacitive load the LMV981MF can drive without instability?

The LMV981MF is characterized to remain stable driving up to 1000 pF, as confirmed in TI's SNOS976M datasheet Figure 6 (Gain/Phase vs Frequency). This allows direct connection to ADC input capacitors or long PCB traces without external isolation resistors - a key advantage over many general-purpose op-amps that oscillate above 100 pF. LMV981MF maintains ≥67° phase margin even with 1000-pF load at 1.8 V.

Does the LMV981MF support true single-supply operation with input signals below ground?

Yes - the LMV981MF features rail-to-rail input common-mode range extending 200 mV beyond the supplies, meaning it accepts inputs from −0.2 V (when V− = 0 V) up to V+ + 0.2 V. This enables accurate sensing of battery voltages near 0 V or reference voltages slightly negative relative to system ground, without requiring dual supplies. LMV981MF achieves this using a specialized CMOS input stage validated across −40°C to 125°C.

What is the typical output voltage swing of the LMV981MF into a 600-Ω load at 1.8 V supply?

At 1.8 V supply and 25°C, the LMV981MF delivers a typical output swing of 1.72 V (positive) and 0.105 V (negative) into 600 Ω - i.e., within 80 mV of each rail. This is specified in the "Electrical Characteristics – DC, 1.8 V" table (Section 7.5) of the SNOS976M datasheet. The swing remains usable (≥1.63 V positive, ≤0.12 V negative) across the full −40°C to 125°C range, ensuring consistent ADC interface performance in harsh environments.

How does the shutdown function behave on the LMV981MF, and what is its wake-up time?

The LMV981MF enters shutdown when the SHDN pin is driven low (≤0.55 V), reducing supply current to ≤1 µA. It exits shutdown and reaches full output functionality within 19 µs after SHDN rises above 1 V (V_SHDN turnon threshold). This fast wake-up enables burst-mode sensing in wearables - for example, waking every 100 ms to sample a sensor for 50 µs - minimizing average power without sacrificing responsiveness. LMV981MF's shutdown behavior is fully characterized across temperature and supply voltage.

Can the LMV981MF operate from a 5-V supply, and how do key parameters change?

Yes - the LMV981MF is fully specified from 1.8 V to 5 V. At 5 V, its output swing improves to within 120 mV of each rail into 600 Ω, short-circuit current increases to 80–100 mA (sourcing), and gain-bandwidth product rises slightly to 1.5 MHz. However, supply current increases to 116–210 µA, and input offset voltage remains unchanged (max 4 mV). These trade-offs make LMV981MF viable in mixed-voltage systems where 5-V rails coexist with low-power domains.