Texas Instruments LMV7291MG

Overview

LMV7291MG from Texas Instruments is a single-channel rail-to-rail input, push-pull output comparator optimized for ultra-low-power operation at 1.8 V supply. It delivers 880 ns propagation delay (20 mV overdrive), 9 µA supply current, 4 mV max input offset voltage, and −0.1 V to 1.9 V input common-mode range - enabling precision threshold detection in battery-powered portable electronics.

For engineers reviewing the LMV7291MG datasheet, LMV7291MG pinout, LMV7291MG application, or LMV7291MG equivalent, this page provides verified functional identity, SC70-5 package mapping, real-world timing and power trade-offs, and validated alternative options for low-voltage comparator selection.

Technical Context

The LMV7291MG employs a parallel bipolar PNP/NPN input stage to achieve rail-to-rail input operation down to −0.1 V below V− and up to 0.1 V beyond V+, with crossover near 950 mV from V+. Its push-pull CMOS output eliminates external pull-up resistors and minimizes static power draw during active load driving.

Propagation delay varies with supply voltage and overdrive: 880 ns at 1.8 V/20 mV, 1200 ns at 2.7 V/20 mV, and 2100 ns at 5 V/20 mV. Input bias current remains stable at 10 nA across 1.8–5 V supplies, while input offset drift is specified at 10 µV/°C.

Key Specifications

Pinout & Package

LMV7291MG is housed in a 5-pin SC70 (DCK) package - 2.0 mm × 1.25 mm footprint, 0.65 mm pitch - optimized for space-constrained PCB layouts in handheld devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage comparator applications.

Compared with TLV7211IDBVR and NCS2200SQ2T2G, the LMV7291MG uniquely combines rail-to-rail input, push-pull output, and sub-10 µA quiescent current - making it the only option among the three that supports true ground-referenced sensing without external components.

Availability

LMV7291MG is available at Aetrix Electronics and suitable for battery-powered electronics, portable medical sensors, and low-voltage power management systems requiring stable component supply across extended product lifecycles.

Supply support for LMV7291MG 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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision signal chain and low-power design.

The LMV7291MG belongs to TI's low-voltage precision comparator family, engineered specifically for energy-constrained applications where rail-to-rail input operation, nanoamp-level quiescent current, and SC70 packaging are mandatory.

FAQ

What is the absolute maximum supply voltage rating for the LMV7291MG?

The LMV7291MG has an absolute maximum supply voltage (V+ − V−) of 5.5 V. Exceeding this limit risks permanent damage to the internal BiCMOS structure. Operation above 5.0 V is not characterized - all guaranteed specifications apply only up to 5.0 V, and thermal dissipation must be verified per θJA = 265°C/W for the SC70 package when operating near limits.

Does the LMV7291MG support true rail-to-rail input operation, and what does that mean for circuit design?

Yes, the LMV7291MG supports true rail-to-rail input: its common-mode range extends from −0.1 V below V− to +0.1 V above V+. This means it can accurately compare signals at ground (e.g., battery discharge cutoff) or near V+ (e.g., overvoltage detection), eliminating the need for level-shifting resistors. Designers must ensure input sources can drive into this extended range without violating absolute maximum ratings.

What is the typical propagation delay of the LMV7291MG at 1.8 V supply, and how does overdrive affect it?

The LMV7291MG exhibits 880 ns typical propagation delay (tPHL) at 1.8 V supply with 20 mV input overdrive. Increasing overdrive to 50 mV reduces delay to 570 ns. This inverse relationship holds across all supply voltages - designers should size hysteresis or reference margins to maintain consistent timing in noise-prone environments where overdrive may vary.

Can the LMV7291MG drive capacitive loads directly, and what layout precautions are required?

Yes, the LMV7291MG's push-pull output can drive capacitive loads directly, but layout must prevent oscillation. A 0.1 µF ceramic bypass capacitor is mandatory between V+ and GND pins, placed within 2 mm of the device. Output traces must avoid proximity to input nodes, and a solid ground plane should separate them. For loads >100 pF, series damping resistance (10–100 Ω) at the output is recommended.

Is the LMV7291MG pin-compatible with other comparators in the LMV72xx family, such as the LMV7292 or LMV7294?

No, the LMV7291MG is not pin-compatible with LMV7292 (dual) or LMV7294 (quad). While all share the SC70 package footprint, the LMV7291MG uses a 5-pin configuration (V+, IN−, IN+, GND, OUT), whereas LMV7292 and LMV7294 use 8-pin SC70 packages with different pin assignments. Board redesign is required for channel count upgrades - no drop-in replacement exists.