My Inquiry
My Account
Texas Instruments LMV791MK
- Part No.:
- LMV791MK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMV791MK.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMV791MK from Texas Instruments is a single-channel, rail-to-rail output, CMOS-input operational amplifier optimized for low-noise, low-voltage sensor signal conditioning. It delivers 5.8 nV/√Hz input voltage noise density, 17 MHz unity-gain bandwidth, and 1.15 mA supply current at 5 V - enabling high-fidelity photodiode transimpedance amplification in battery-powered medical and instrumentation systems.
For engineers reviewing the LMV791MK datasheet, LMV791MK pinout, LMV791MK application, or LMV791MK equivalent, key selection criteria include its 100 fA input bias current, shutdown mode (≤0.14 µA), rail-to-rail swing (25 mV from rail @ 2 kΩ), −40°C to 125°C operation, and SOT-23-6 package compatibility with space-constrained analog front-ends.
Technical Context
The LMV791MK employs a CMOS input stage with ground-sensing capability (input common-mode range includes V−), enabling true single-supply operation down to 1.8 V. Its internal architecture integrates an enable-controlled bias network that reduces quiescent current to <0.14 µA in shutdown while preserving fast turnon (110 ns) and turnoff (800 ns) timing.
It achieves unity-gain stability with 17 MHz GBW and 9.5 V/µs slew rate (rising) using a compensated internal topology, supporting precision active filtering and buffering without external compensation. Output drive capability reaches ±45 mA into 2-kΩ loads while maintaining rail-to-rail swing within 25 mV of either supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 5.8 nV/√Hz at 1 kHz - enables high-SNR amplification of microvolt-level sensor signals without added noise floor degradation. |
| Unity-Gain Bandwidth | 17 MHz - supports wideband signal conditioning up to ~1.7 MHz closed-loop bandwidth in gain-of-10 configurations. |
| Supply Current (Enable Mode) | 1.15 mA typical at 5 V - balances performance and power efficiency for portable instrumentation requiring continuous operation. |
| Shutdown Current | 0.14 µA typical at 5 V - extends battery life in intermittent-sampling systems such as wearable biosensors. |
| Rail-to-Rail Output Swing | 25 mV from rail @ 2 kΩ load - maximizes dynamic range in 1.8–5.5 V supplies, critical for ADC input driving with minimal headroom loss. |
| Input Bias Current | 100 fA max at −40°C to 125°C - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces. |
| Common-Mode Input Range | Includes V− (ground) - allows direct DC-coupled sensing of 0-V referenced signals in single-supply configurations. |
Pinout & Package
LMV791MK is housed in a 6-pin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Amplifier output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking ≥45 mA into 2-kΩ loads while maintaining linearity. |
| V− (Pin 2) | Negative supply rail | Reference for input common-mode range (includes this pin); must be connected to system ground or negative supply. |
| +IN (Pin 3) | Noninverting input | High-impedance CMOS node; accepts signals from 0 V to V+ − 0.3 V with minimal loading in sensor interface applications. |
| −IN (Pin 4) | Inverting input | High-impedance CMOS node; used for feedback configuration in transimpedance, difference, and inverting amplifier topologies. |
| EN (Pin 5) | Enable control input | Logic-level input: ≥4.6 V enables operation; ≤0.4 V places amplifier in shutdown with sub-µA quiescent draw. |
| V+ (Pin 6) | Positive supply rail | Accepts 1.8–5.5 V; powers internal biasing and output stage; PSRR >80 dB ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise CMOS input stage | 5.8 nV/√Hz voltage noise + 0.01 pA/√Hz current noise enables high-fidelity amplification of femtoampere-level photodiode currents. |
| Ultra-low input bias current | 100 fA maximum over full temperature range preserves gain accuracy in high-Z sensor circuits without leakage-induced offset drift. |
| Wide supply voltage range | Operates from 1.8 V to 5.5 V with ensured performance at both 2.5 V and 5 V - supports direct integration into Li-ion, coin-cell, and USB-powered systems. |
| Fast enable/disable control | 110 ns turnon / 800 ns turnoff enables precise duty-cycled operation in time-multiplexed sensor arrays or low-power wake-up architectures. |
| Rail-to-rail output with high drive | Swings within 25 mV of rails into 2-kΩ and delivers ±45 mA - eliminates need for level-shifting circuitry when interfacing with 12-bit+ SAR ADCs. |
Applications
| Photodiode Amplifiers | Active Filters and Buffers |
|---|---|
|
Use Scenario: Amplifying weak current signals from silicon photodiodes in pulse oximetry or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain via feedback resistor; EN pin synchronized to LED pulse timing. Use Value: 100 fA input bias prevents photodiode leakage from dominating signal path; 5.8 nV/√Hz noise ensures >80 dB SNR at 100-kHz bandwidth. |
Use Scenario: Implementing anti-aliasing and reconstruction filters in portable data acquisition systems. IC Role / Device Role / Timing Role: Unity-gain stable buffer and second-order active filter stage operating from 3.3-V rail. Use Value: 17-MHz GBW supports filter cutoffs up to 1.5 MHz with <0.1 dB passband ripple; rail-to-rail swing preserves full ADC input range. |
| Low-Noise Signal Processing | Sensor Interface Applications |
|
Use Scenario: Conditioning low-amplitude EEG or ECG signals in ambulatory monitoring devices. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with DC-coupled ground-referenced input. Use Value: Input common-mode range including V− enables direct connection to electrode inputs; 0.01% THD+N at 1 kHz maintains waveform fidelity. |
Use Scenario: Interfacing high-impedance pH or gas sensors in handheld analyzers. IC Role / Device Role / Timing Role: High-Z voltage follower with shutdown control during sensor calibration intervals. Use Value: Shutdown current <0.14 µA minimizes average power in battery-operated units; 125°C rating supports industrial ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA376AIDBVR | Lower input voltage noise (4.2 nV/√Hz), higher supply current (760 µA), no shutdown pin | Lacks enable functionality; better for always-on ultra-low-noise stages where power budget permits | Select when absolute minimum noise dominates over power and control flexibility |
| MCP6001UT-E/OT | Higher input voltage noise (17 nV/√Hz), lower supply current (100 µA), no shutdown, wider temp range (−40°C to 150°C) | Cost-optimized general-purpose replacement; unsuitable for photodiode or precision sensor front-ends | Select for non-critical signal paths where cost and availability outweigh noise and bias current requirements |
Compared with OPA376AIDBVR and MCP6001UT-E/OT, the LMV791MK uniquely combines sub-6-nV/√Hz noise, integrated shutdown, and guaranteed 1.8-V operation - making it the only choice among the three for battery-powered, high-precision, intermittently active sensor amplifiers.
Availability
LMV791MK is available at Aetrix Electronics and suitable for photodiode amplifiers, active filters and buffers, and low-noise signal processing applications requiring stable component supply across automotive, industrial, and medical design cycles.
Supply support for LMV791MK 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The LMV791MK belongs to TI's LMV79x family of low-noise, CMOS-input op-amps designed specifically for high-fidelity, low-voltage sensor interface and signal conditioning in portable and industrial instrumentation.
FAQ
What is the minimum supply voltage for reliable operation of the LMV791MK?
The LMV791MK is fully specified and ensured operational at 1.8 V supply voltage for temperatures between 0°C and 125°C, and across the full −40°C to 125°C range at 2.0 V and above. This enables direct use with single-cell lithium batteries and energy-harvesting sources without regulation. The LMV791MK maintains rail-to-rail output swing and 17-MHz bandwidth even at 1.8 V, as confirmed in TI's SNOSAG6G datasheet Section 6.3.
Does the LMV791MK support true rail-to-rail input common-mode range?
No - the LMV791MK features rail-to-rail *output* swing but only ground-sensing *input* common-mode range (includes V−, but not V+). Its input common-mode voltage range extends from V− to V+ − 0.3 V, as specified in Section 6.5 of the LMV791MK datasheet. This allows direct coupling of 0-V referenced sensors but requires input signals to remain ≥0.3 V below V+ to avoid clipping or increased distortion.
How does the enable pin (EN) of the LMV791MK behave under varying supply voltages?
The LMV791MK EN pin threshold scales with supply: enable occurs when VEN ≥ V+ − 0.5 V, and shutdown activates when VEN ≤ V− + 0.4 V. At 5 V supply, this translates to EN ≥ 4.5 V (typical 4.6 V) for operation and EN ≤ 0.4 V for shutdown. These thresholds are production-tested and stable across −40°C to 125°C, ensuring robust control in battery-discharge scenarios.
Can the LMV791MK drive a 600-Ω load while maintaining rail-to-rail output swing?
Yes - the LMV791MK is explicitly characterized driving 600-Ω loads, with output swing specified as "25 mV from rail" under those conditions at 25°C (Section 6.5, VOUT parameter). At 125°C and full temperature range, swing degrades to ≤45 mV from rail into 600 Ω, per datasheet limits. This capability supports direct interface with legacy audio codecs and RF test equipment requiring 600-Ω termination.
What is the typical total harmonic distortion + noise (THD+N) performance of the LMV791MK?
The LMV791MK delivers 0.01% THD+N at 1 kHz with 600-Ω load and unity gain, as measured per standard JEITA ED-4701 testing methodology. This value holds across 2.5-V and 5-V supplies and is independent of enable/shutdown state - confirming consistent linearity in both active and standby modes. The low distortion stems from its CMOS input stage and optimized output stage biasing, as detailed in Section 6.5 and Figure 28 of SNOSAG6G.
LMV791MK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 11.5V/µs
- Gain Bandwidth Product:
- 17 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.15mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMV791MK FAQ
1.How can I place an order for LMV791MK through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV791MK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMV791MK reliable?
The price and inventory of LMV791MK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV791MK is usually 5 days.
3.What payment methods are accepted for LMV791MK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV791MK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV791MK?
LMV791MK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV791MK order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMV791MK?
For technical support, including LMV791MK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV791MK requirements.
6.How does Aetrix verify that LMV791MK is sourced from the original manufacturer or authorized distributors?
All LMV791MK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMV791MK meets industry standards.
7.What is the process for return or replacement of LMV791MK?
All LMV791MK units undergo pre-shipment inspection (PSI). If there is an issue with LMV791MK, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMV791MK part is unused and in its original packaging.
Return procedure for LMV791MK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV791MK Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
