LMV761MFX/NOPB - 120ns Precision Comparator w/ Shutdown | TI | SOT-23-6
MPN: LMV761MFX/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.41 | $14.10 |
| 100 | $1.15 | $115.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.75 | $750.00 |
| 3,000 | $0.55 | $1,650.00 |
LMV761MFX/NOPB Overview
A comparator is a high-gain differential amplifier whose output swings fully high or fully low depending on which of its two inputs is more positive. Precision comparators such as the LMV761 are distinguished from general-purpose comparators by very low input offset voltage, low input bias current, and tight propagation delay, making them the reference building block for threshold detection, zero-crossing detection, and analog signal conditioning. The LMV761 belongs to the linear / comparator IC category, sits in the signal-chain hierarchy between analog front-ends and digital logic, and is widely used in battery-powered and space-constrained designs.
Key features of the LMV761MFX/NOPB include a 120 ns typical propagation delay, push-pull CMOS output (no pull-up resistor required), rail-to-rail input common-mode range, an active-low shutdown pin for power management, internal hysteresis for clean switching on slow signals, and ESD protection on the pins. The push-pull topology drives CMOS/TTL loads directly with symmetric rise/fall times, which is critical when the comparator output feeds a high-impedance logic input or a microcontroller interrupt.
Architecturally, the LMV761 uses a bipolar-CMOS input stage that yields low input bias current combined with low offset, followed by a fast latch and CMOS output drivers. The shutdown circuit is implemented as a gated bias path that collapses the input stage current when SHDN is low, while preserving the output in a defined high-impedance state so downstream circuitry can hold the last logic level.
Typical applications include battery management (over-voltage / under-voltage detection), threshold detectors in industrial sensor modules, line drivers and zero-crossing detectors for power-line monitoring, alarm and security subsystems, and general signal conditioning ahead of an MCU ADC. Designers favor it for any 3.3 V or 5 V system that needs a fast, low-power, board-space-saving comparator.
When designing with this part, place a 0.1 uF bypass capacitor within a few millimeters of VCC, keep input trace lengths short to minimize parasitic feedback that causes oscillation, and ensure the SHDN pin (when unused) is tied high through a resistor, never left floating. The push-pull output cannot be wire-ORed with another comparator output; if that topology is required, select an open-drain variant instead.
This page synthesizes distributor pricing, drop-in same-package alternatives, comparison parameters, and practical PCB-level design notes that complement the manufacturer datasheet without replacing it.
Drop-in alternatives for LMV761MFX/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LMV761MFX/NOPB (same form factor and footprint) — differing in Comparator Type, Output Type, Package, Propagation Delay.
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LMV761MF/NOPB
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LMV761MFX/NOPB Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Comparator Type | General Purpose, Precision |
| Output Type | Push-Pull (CMOS/TTL) |
| Propagation Delay | 120 ns (typical) |
| Supply Voltage Range | 2.7 V to 5 V |
| Supply Current (active) | Sub-mA (datasheet typical) |
| Shutdown Current | Sub-microampere level |
| Input Common-Mode Range | Rail-to-rail |
| Shutdown Pin | Yes (active-low) |
| Operating Temperature | -40C to +125C |
| Package | SOT-23-6 (DBV) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-08A) |
| Lead Finish | Matte Tin (lead-free) |
| RoHS Status | Compliant (NOPB suffix) |
| ESD Protection | Yes (per datasheet HBM/CDM specs) |
| Pin Count | 6 |
LMV761MFX/NOPB Pin Configuration
| Pin 1 | OUT — Push-pull comparator output |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply / ground (single-supply: GND) |
| Pin 5 | SHDN — Active-low shutdown; tie high through resistor if unused |
| Pin 6 | V+ — Positive supply (2.7 V to 5 V) |
Typical Applications
LMV761MFX/NOPB is suitable for 7 applications: Battery Voltage Monitoring & Protection, Zero-Crossing Detector for Power-Line Monitoring, Industrial Sensor Threshold Detection, Portable Medical & Wearable Alarm Signals, IoT & Smart Home Sensor Front-End, Automotive Alarm & Body Electronics, Signal Conditioning for ADC Threshold Detection.
Battery Voltage Monitoring & Protection
The LMV761MFX/NOPB is a strong fit for battery voltage monitoring and over-/under-voltage protection in single-cell Li-ion and multi-cell alkaline packs. Its 120 ns propagation delay is fast enough to disconnect a load within microseconds when cell voltage crosses a safety threshold, while the 2.7 V to 5 V supply range covers the entire discharge curve. The push-pull output drives a PFET gate or MCU interrupt directly without a pull-up, and the active-low shutdown pin lets the system drop quiescent current to a sub-microampere level when the host is asleep. Designers typically place the LMV761 between the battery stack and a low-power MCU such as the MSP430, with the reference threshold set by a precision divider.
Recommended
Zero-Crossing Detector for Power-Line Monitoring
In zero-crossing detectors for 50/60 Hz power-line monitoring, the LMV761MFX/NOPB compares a scaled mains waveform against ground and emits a clean logic edge at every AC crossing. The rail-to-rail input common-mode range lets the divider reference sit at mid-rail without level shifting, and the 120 ns propagation delay introduces negligible timing error versus the 8.3 ms half-cycle period. The push-pull output feeds a microcontroller timer capture input directly, enabling phase-angle control for TRIAC dimmers or SCR firing circuits. The shutdown pin is unused in this application but is internally defined, simplifying the schematic.
Recommended
Industrial Sensor Threshold Detection
Factory automation modules often require a precision comparator to convert analog sensor outputs (thermistors, photodiodes, strain gauges) into a clean logic-level alarm. The LMV761MFX/NOPB handles this with its low input offset voltage (preserving threshold accuracy across temperature) and its -40C to +125C industrial operating window that survives unheated cabinet installations. The SOT-23-6 footprint fits on dense 4-layer sensor boards, and the push-pull output drives a 24 V isolator or relay driver stage without an additional buffer. Its shutdown pin is useful for duty-cycled sensing loops that sample at 1 Hz to save average current.
Recommended
Portable Medical & Wearable Alarm Signals
In portable medical and wearable alarm applications, the LMV761MFX/NOPB acts as a low-power threshold detector for battery-low, body-temperature-exceed, or heart-rate out-of-range conditions. The sub-microampere shutdown current lets the host MCU power-gate the comparator between samples, extending coin-cell life by 30-50%. The SOT-23-6 package is small enough for wrist-worn form factors, and the push-pull output drives a piezo buzzer driver or BLE radio interrupt directly. The 2.7 V minimum supply lets the part run from a single CR2032 cell through most of its discharge curve, simplifying the power tree.
Recommended
IoT & Smart Home Sensor Front-End
The LMV761MFX/NOPB is a natural fit for IoT and smart-home sensor front-ends where a low-cost, low-power comparator must convert an analog threshold into a wake-up signal for an MCU or radio. With its 120 ns propagation delay and sub-microampere shutdown current, the part adds negligible quiescent drain while enabling instant wake on events such as motion-detector output, gas-sensor alarm, or door-magnetic-switch trip. The push-pull CMOS output is compatible with 3.3 V logic on ESP32, nRF52, and similar wireless MCUs, and the SOT-23-6 footprint fits under shields to save board area.
Recommended
Automotive Alarm & Body Electronics
The LMV761MFX/NOPB is widely deployed in automotive alarm systems, body controllers, and accessory-detection modules where a precision 5 V comparator must flag a digital event. The -40C to +125C industrial temperature range covers cabin and under-hood environments, and the 120 ns propagation delay supports anti-theft ultrasonic transducer envelopes and door-ajar detection with sub-millisecond response. The push-pull output drives automotive-grade MOSFETs and 5 V logic, while the shutdown pin supports ignition-off sleep modes that drop quiescent current to a sub-microampere level for parked-vehicle battery preservation.
Recommended
Signal Conditioning for ADC Threshold Detection
When an analog signal must trigger an MCU interrupt before the ADC samples, the LMV761MFX/NOPB serves as a fast analog watchdog that pre-emptively alerts the MCU to out-of-range conditions. Its 120 ns propagation delay is faster than most MCU ADC conversion times, and its push-pull output can directly drive an interrupt request line. The rail-to-rail input common-mode range simplifies interface to single-supply op-amp outputs and sensor bridges, while the SOT-23-6 footprint allows placement adjacent to the analog signal path without disrupting the digital routing. Designers often combine the LMV761 with a precision op-amp front-end and a low-power reference to build a complete analog monitor.
Recommended
Recommended Products Summary
Engineering reference data for LMV761MFX/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMV761MF/NOPB | LMV761MFX | LMV761MAX/NOPB | LMV761MA/NOPB | LMV7239M7/NOPB |
|---|---|---|---|---|---|---|
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOIC-8 | SOIC-8 | SC-70-5 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Type | Push-Pull | Push-Pull | Push-Pull | Push-Pull | Push-Pull | Push-Pull |
| Lead-Free (NOPB) | Yes | Yes | No (suffix absent) | Yes | Yes | Yes |
Key Differentiators
- Integrated active-low shutdown pin for sub-microampere sleep current (vs LMV7239M7/NOPB)
- Smallest available package for a TI precision shutdown comparator (vs LMV761MA/NOPB (SOIC-8))
- Push-pull CMOS output eliminates external pull-up component (vs Open-drain comparators in same SOT-23-6)
Design Notes
Place a 0.1 uF X7R ceramic bypass capacitor within 2-3 mm of the V+ pin (pin 6) and an additional 1 uF bulk capacitor if the supply trace exceeds 50 mm. The LMV761 draws a sub-mA active current with fast edge transitions, and inadequate bypassing will manifest as output oscillations or chatter near the threshold. Do not share the bypass capacitor with a high-current load such as an LED or relay coil - use a star-ground topology so the comparator reference and load return currents do not modulate V+.
If the shutdown pin (pin 5) is unused, it MUST be tied high through a 100 kohm resistor to V+. A floating SHDN pin can drift to an intermediate voltage, leaving the comparator in an undefined bias state where the input stage draws excess current and the output may toggle erratically. Also note that the push-pull output cannot be wired-ORed with another push-pull output on the same net; if wire-ORing is required (e.g., for interrupt sharing), select an open-drain comparator variant such as the LMV7235 instead.
Keep input traces (IN+ / IN-, pins 2 and 3) short and direct, with a ground reference plane on the layer immediately below. Long input traces introduce parasitic capacitance that, combined with the source impedance, forms an RC delay network that can cause the comparator to oscillate or ring as the input crosses the threshold. For high-impedance sources (>10 kohm), add a small amount of positive feedback (hysteresis) externally with a 100 kohm to 1 Mohm resistor from output to IN+ to ensure clean switching. Avoid routing input traces adjacent to switching signals or clock lines; even 5 mV of coupled noise on a precision comparator input can cause false triggers.
Estimated propagation delay for a 100 mV overdrive at room temperature is approximately 120 ns as listed on TI's product page. For slower 1 mV overdrive inputs, the propagation delay can extend to several hundred nanoseconds; account for this when designing closed-loop timing budgets. The push-pull output has roughly symmetric rise/fall times of 10-20 ns into a 50 pF load, but for heavy capacitive loads (>100 pF), add a 100 ohm series resistor at the output to limit peak current and reduce ringing.
Compliance Information
Lead-free and RoHS compliant per the /NOPB suffix and TI product page. AEC-Q100 not applicable - this is an industrial-grade part, not an automotive-qualified variant.
