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Texas Instruments LMV791MKX/NOPB
- Part No.:
- LMV791MKX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMV791MKX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:4,590
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Product details
Overview
LMV791MKX/NOPB 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 at 1 kHz, 17 MHz unity-gain bandwidth, and 1.15 mA supply current at 5 V - enabling high-fidelity amplification in photodiode transimpedance and medical instrumentation circuits.
For engineers reviewing the LMV791MKX/NOPB datasheet, LMV791MKX/NOPB pinout, LMV791MKX/NOPB application, or LMV791MKX/NOPB equivalent, key selection considerations include its 100 fA input bias current, shutdown mode consuming only 0.02 µA, rail-to-rail swing within 25 mV of rails at 10-kΩ load, and guaranteed operation from 1.8 V to 5.5 V across −40°C to +125°C.
Technical Context
The LMV791MKX/NOPB employs a CMOS input stage with ground-sensing capability (input common-mode range includes V−), enabling direct single-supply interfacing with grounded sensors. Its internal architecture integrates a dedicated enable pin controlling a low-leakage shutdown path that reduces quiescent current to <1 µA while preserving fast turnon (110 ns) and turnoff (800 ns) timing.
It achieves unity-gain stability with 17 MHz gain-bandwidth product and 9.5 V/µs slew rate (rising) under 5-V operation, while maintaining 85 dB open-loop gain into 2-kΩ load and 75 dB minimum CMRR over full temperature range - supporting precision DC-coupled and wideband AC signal paths without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 5.8 nV/√Hz at 1 kHz - enables detection of sub-µV signals in photodiode and strain gauge front-ends |
| Unity-Gain Bandwidth | 17 MHz - supports stable amplification of audio and ultrasonic sensor outputs up to ~10 MHz |
| Supply Current (Active) | 1.15 mA at 5 V - allows battery-powered operation >100 hours on a 120-mAh coin cell |
| Shutdown Current | 0.02 µA - reduces average power by >99% during idle cycles in duty-cycled sensor nodes |
| Rail-to-Rail Output Swing | 25 mV from rail at 10-kΩ load - maximizes dynamic range in 3.3-V or lower ADC interfaces |
| Input Bias Current | 100 fA max at 125°C - prevents significant offset drift in high-impedance pH or ion-selective electrode circuits |
| Operating Temperature | −40°C to +125°C - qualified for automotive cabin and industrial motor control ambient conditions |
Pinout & Package
LMV791MKX/NOPB is housed in a 6-pin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable and wearable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Amplifier output | Capable of sourcing 45 mA / sinking 37 mA at 5 V; rail-to-rail swing supports full-scale ADC utilization |
| V− (Pin 2) | Negative supply rail | Reference for input common-mode range extending to V−; enables true ground-referenced sensing |
| +IN (Pin 3) | Noninverting input | CMOS input with 100 fA bias current; accepts signals down to V− without phase reversal |
| −IN (Pin 4) | Inverting input | High-impedance node for feedback networks; supports transimpedance gains up to 10⁹ V/A |
| EN (Pin 5) | Enable control input | Logic-compatible: ≥4.6 V enables, ≤0.4 V disables; internal hysteresis prevents chatter near threshold |
| V+ (Pin 6) | Positive supply rail | Operates from 1.8 V to 5.5 V; PSRR >80 dB ensures immunity to digital supply noise |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise CMOS input | 5.8 nV/√Hz voltage noise + 0.01 pA/√Hz current noise preserves SNR in high-Z sensor interfaces |
| Shutdown with fast recovery | 0.02 µA quiescent current in shutdown; 110 ns turnon time enables microsecond-level wake-up in IoT nodes |
| Rail-to-rail output stage | Swings within 25 mV of rails at 10-kΩ load - delivers full 3.3-V ADC input range from 3.3-V supply |
| Ground-sensing input | Input common-mode range includes V− - eliminates level-shifting need for 0-V referenced transducers |
| Wide supply range | Guaranteed operation from 1.8 V to 5.5 V - supports direct connection to Li-ion, coin cell, and USB supplies |
Applications
| Photodiode Amplifiers | Active Filters and Buffers |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in pulse oximetry or smoke detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10⁸–10⁹ Ω feedback resistor; requires ultra-low input bias current and voltage noise. Use Value: 100 fA input bias current prevents dark-current-induced offset; 5.8 nV/√Hz noise enables detection of <100 nA photocurrents. |
Use Scenario: Buffering and filtering analog sensor outputs before SAR ADC sampling in condition monitoring systems. IC Role / Device Role / Timing Role: Unity-gain stable buffer and 2nd-order active filter stage; demands low distortion and wide bandwidth. Use Value: 0.01% THD+N at 1 kHz into 600 Ω ensures fidelity; 17 MHz GBW supports anti-aliasing up to 5 MHz. |
| Low-Noise Signal Processing | Medical Instrumentation |
Use Scenario: Pre-amplifying EEG or ECG signals in portable diagnostic devices with limited battery capacity. IC Role / Device Role / Timing Role: First-stage gain block with DC-coupled input; must reject electrode half-cell potentials and 50/60 Hz interference. Use Value: 75 dB min CMRR and 80 dB PSRR suppress common-mode noise; shutdown mode extends battery life between measurements. |
Use Scenario: Front-end amplification in handheld blood glucose meters using electrochemical test strips. IC Role / Device Role / Timing Role: Precision current-to-voltage converter for nanoampere-level amperometric measurements. Use Value: 100 fA input bias current avoids measurement error in 100-MΩ strip impedance; −40°C to +125°C rating covers storage and clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, CMOS-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA376AIDBVR | Lower input voltage noise (4.5 nV/√Hz), higher supply current (760 µA), no shutdown pin | Lacks enable functionality; better for always-on precision stages where power budget allows | Select when lowest possible noise dominates over power savings and shutdown is unnecessary |
| MCP6001T-E/OT | Higher input voltage noise (17 nV/√Hz), lower supply current (100 µA), no shutdown, wider temp range (−40°C to +125°C) | Suitable for cost-sensitive, non-noise-critical sensor buffers; lacks rail-to-rail output swing spec | Select for basic buffering where noise <10 nV/√Hz is not required and shutdown is not needed |
Compared with OPA376AIDBVR and MCP6001T-E/OT, LMV791MKX/NOPB uniquely balances ultra-low noise (5.8 nV/√Hz), integrated shutdown (<0.02 µA), and rail-to-rail output in a 6-pin SOT-23 - making it optimal for battery-powered, noise-sensitive, intermittently active sensor nodes.
Availability
LMV791MKX/NOPB is available at Aetrix Electronics and suitable for photodiode amplifiers, medical instrumentation, and low-noise signal processing requiring stable component supply across automotive, industrial, and portable electronics programs.
Supply support for LMV791MKX/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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and low-power signal chain solutions.
The LMV791MKX/NOPB belongs to TI's LMV79x family of low-noise, CMOS-input op-amps designed specifically for high-fidelity, low-voltage sensor interface applications in portable and medical equipment.
FAQ
What is the maximum capacitive load the LMV791MKX/NOPB can drive while remaining stable?
The LMV791MKX/NOPB maintains phase margin >40° with up to 100 pF capacitive load when driving a 10-MΩ resistive load at 5 V supply, per Figure 40 in the datasheet. For loads >100 pF, external isolation resistor (e.g., 10–50 Ω in series with output) is recommended to prevent peaking or oscillation in high-speed buffer configurations.
Does the LMV791MKX/NOPB support true single-supply operation with input signals at ground potential?
Yes. The LMV791MKX/NOPB features a CMOS input stage with input common-mode voltage range extending to V− (including ground), enabling direct interface with grounded sensors such as thermistors or bridge transducers without level-shifting circuitry - confirmed in Section 7.3.4 and Table 6.5 CMVR specification.
What is the typical turnon time for the LMV791MKX/NOPB when exiting shutdown mode?
The LMV791MKX/NOPB has a typical turnon time of 110 ns from enable pin assertion (VEN rising above 4.6 V) to output settling within 1% of final value under 5-V supply conditions, as specified in Table 6.6. This enables rapid wake-up in duty-cycled data acquisition systems.
Can the LMV791MKX/NOPB be used as a comparator?
No. The LMV791MKX/NOPB is not characterized or recommended for open-loop comparator operation. Its output stage uses positive feedback for enhanced drive strength, which may cause unpredictable behavior or latch-up when overdriven - explicitly cautioned in Section 7.3.4 of the datasheet.
Is the LMV791MKX/NOPB RoHS-compliant and lead-free?
Yes. The LMV791MKX/NOPB carries the "/NOPB" suffix, indicating TI's standard lead-free, RoHS-compliant packaging per JEDEC J-STD-020 moisture sensitivity level 1 and IPC/JEDEC J-STD-033 handling requirements.
LMV791MKX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LMV791MKX/NOPB FAQ
1.How can I place an order for LMV791MKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV791MKX/NOPB 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 LMV791MKX/NOPB reliable?
The price and inventory of LMV791MKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV791MKX/NOPB is usually 5 days.
3.What payment methods are accepted for LMV791MKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV791MKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV791MKX/NOPB?
LMV791MKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV791MKX/NOPB 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 LMV791MKX/NOPB?
For technical support, including LMV791MKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV791MKX/NOPB requirements.
6.How does Aetrix verify that LMV791MKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV791MKX/NOPB 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 LMV791MKX/NOPB meets industry standards.
7.What is the process for return or replacement of LMV791MKX/NOPB?
All LMV791MKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV791MKX/NOPB, 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 LMV791MKX/NOPB part is unused and in its original packaging.
Return procedure for LMV791MKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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