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Texas Instruments LMP7731MFX/NOPB
- Part No.:
- LMP7731MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMP7731MFX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
LMP7731MFX/NOPB from Texas Instruments is a single-channel, rail-to-rail input/output precision operational amplifier optimized for low-noise, high-accuracy signal conditioning in low-voltage systems. It delivers 2.9 nV/√Hz input voltage noise at 1 kHz, 22 MHz gain bandwidth, 130 dB open-loop gain, ±1.5 nA input bias current, and operates from 1.8 V to 5.5 V supply - making it ideal for photometric instrumentation and portable medical sensors.
For engineers reviewing the LMP7731MFX/NOPB datasheet, LMP7731MFX/NOPB pinout, LMP7731MFX/NOPB application, or LMP7731MFX/NOPB equivalent, key selection criteria include its ultra-low 1/f noise corner (3 Hz), rail-to-rail output swing within 13 mV of rails (at 2 kΩ load), CMRR ≥129 dB, PSRR ≥117 dB, and guaranteed operation across −40°C to +125°C.
Technical Context
The LMP7731MFX/NOPB uses a proprietary bipolar input stage with integrated bias current cancellation, enabling ±1.5 nA input bias current while retaining low voltage noise - a rare combination typically found only in JFET or CMOS amplifiers. Its 22 MHz GBW and 2.4 V/µs slew rate support stable high-gain configurations up to AV = +100 without sacrificing bandwidth.
This device features rail-to-rail input via dual parallel input stages and rail-to-rail output using complementary output transistors. Its common-mode voltage range extends from 0 V to VS, and it maintains >100 dB CMRR over 99% of that range, ensuring accuracy in single-supply sensor front-ends where DC offset and drift are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.9 nV/√Hz @ 1 kHz - enables detection of microvolt-level signals in photodiode or strain gauge interfaces |
| Gain Bandwidth Product | 22 MHz - supports closed-loop gains up to +100 with >200 kHz usable bandwidth |
| Open-Loop Gain | 130 dB - ensures <1 ppm gain error in precision instrumentation amplifier topologies |
| Input Bias Current | ±1.5 nA - minimizes voltage error across high-impedance sensor sources (e.g., pH electrodes) |
| Supply Voltage Range | 1.8 V to 5.5 V - compatible with Li-ion, coin-cell, and USB-powered portable systems |
| Operating Temperature | −40°C to +125°C - qualified for automotive cabin and industrial control environments |
| CMRR | 129 dB (min) - rejects common-mode interference in noisy industrial signal chains |
Pinout & Package
The LMP7731MFX/NOPB is packaged in a 5-pin SOT-23 surface-mount package (DCU suffix), with thermal resistance θJA = 265°C/W. Pin 1 is marked with a dot; pinout is non-standard (no power-on-reset or enable pins).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−IN) | Differential input node; accepts signals from 0 V to VS; internal ESD diodes limit differential input to ±3×VF |
| 2 | Non-Inverting Input (+IN) | Differential input node; same CMVR and protection as −IN; used for reference or sensor return |
| 3 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ≥27 mA; swings within 13 mV of either rail under 2 kΩ load |
| 4 | Ground (V−) | Power ground reference; must be low-impedance connection to minimize PSRR degradation |
| 5 | Supply (V+) | Positive supply input; decoupling capacitor (≥100 nF) required within 2 mm for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1/f noise corner | 3 Hz - preserves DC accuracy in long-integration measurements (e.g., gas analysis spectroscopy) |
| Bipolar input with bias cancellation | ±1.5 nA IB - achieves JFET-level bias current without sacrificing voltage noise performance |
| Rail-to-rail input and output | 0 V to VS CMVR and <13 mV rail margin - maximizes dynamic range in single-supply 3.3 V systems |
| High PSRR and CMRR | ≥117 dB PSRR / ≥129 dB CMRR - maintains accuracy in battery-powered devices with fluctuating supply or noisy grounds |
| Low THD+N | 0.001% @ 10 kHz - suitable for driving SAR ADCs without post-processing correction |
Applications
| Photometric Instrumentation | Gas Analysis Instruments |
|---|---|
Use Scenario: Amplifying weak current from photodiodes in spectrophotometers or blood oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier front-end with ultra-low noise and minimal input bias current. Use Value: 2.9 nV/√Hz noise and ±1.5 nA bias current enable sub-picoamp resolution without TIA resistor heating errors. | Use Scenario: Signal conditioning for NDIR (non-dispersive infrared) CO₂ sensors with thermopile detectors. IC Role / Device Role / Timing Role: Low-drift, low-noise preamplifier for µV-level thermopile outputs. Use Value: 130 dB open-loop gain and 0.5 µV/°C TCVOS ensure stable gain and minimal temperature-induced baseline drift. |
| Medical Instrumentation | Portable Battery-Powered Sensors |
Use Scenario: Front-end amplification in handheld ECG or EEG monitors with dry electrodes. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail I/O for single-supply analog front-ends. Use Value: 1.8 V minimum supply and 2.2 mA quiescent current extend battery life while maintaining 129 dB CMRR at full scale. | Use Scenario: Signal conditioning in wearable environmental sensors (e.g., air quality, humidity). IC Role / Device Role / Timing Role: Low-power, high-accuracy op-amp for interfacing MEMS or electrochemical sensors. Use Value: −40°C to +125°C rating and 5.5 V max supply allow direct integration with LiPo chargers and boost converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.1 µV/°C TCVOS vs. 0.5 µV/°C; higher 1/f noise (0.2 µVPP vs. 65–78 nVPP) | Better for µV-level DC stability; worse for AC-coupled low-frequency sensor signals | Select OPA333AIDBVR when offset drift dominates error budget; choose LMP7731MFX/NOPB when broadband noise limits SNR |
| ADA4522-1ARMZ | Zero-drift; 5.6 nV/√Hz noise at 1 kHz; 12 V max supply; higher quiescent current (1.2 mA vs. 2.2 mA) | Requires dual supply or level-shifting; better for high-precision lab equipment than portable designs | Select ADA4522-1ARMZ for metrology-grade DC accuracy; LMP7731MFX/NOPB fits space-constrained, low-voltage, low-noise portable systems |
Compared with OPA333AIDBVR and ADA4522-1ARMZ, the LMP7731MFX/NOPB uniquely balances ultra-low broadband noise, rail-to-rail operation at 1.8 V, and bipolar-input linearity - making it optimal for battery-powered photometric and gas sensing front-ends where both noise and supply headroom are limiting factors.
Availability
LMP7731MFX/NOPB is available at Aetrix Electronics and suitable for photometric instrumentation, gas analysis instruments, and portable medical sensors requiring stable component supply, extended temperature qualification, and consistent low-noise performance across production lots.
Supply support for LMP7731MFX/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 leader specializing in analog and embedded processing technologies, with decades of investment in precision amplifier design and characterization.
The LMP7731MFX/NOPB belongs to TI's LMP™ precision amplifier family, engineered specifically for low-noise, rail-to-rail, low-voltage signal conditioning in sensor interfaces - emphasizing DC accuracy, noise integrity, and robustness in portable and industrial measurement systems.
FAQ
What is the input voltage noise density of the LMP7731MFX/NOPB at 1 kHz?
The LMP7731MFX/NOPB has a typical input voltage noise density of 2.9 nV/√Hz at 1 kHz, measured with VS = 5 V, VCM = 2.5 V, and RL > 10 kΩ. This value is confirmed across 2.5 V, 3.3 V, and 5 V supply conditions and remains stable over temperature - a key enabler for high-SNR sensor front-ends.
Does the LMP7731MFX/NOPB support rail-to-rail input and output operation?
Yes, the LMP7731MFX/NOPB supports true rail-to-rail input (CMVR = 0 V to VS) and rail-to-rail output (swing within 13 mV of either rail at 2 kΩ load). This is achieved via dual parallel input stages and complementary output transistors - verified in TI's SNOSAT6E datasheet Figures 44 and 40–41.
What is the maximum operating temperature range for the LMP7731MFX/NOPB?
The LMP7731MFX/NOPB is specified for continuous operation from −40°C to +125°C ambient temperature. This extended range is validated per TI's production testing and thermal characterization, supporting use in automotive engine compartments and industrial control cabinets without derating.
Can the LMP7731MFX/NOPB drive an ADC directly?
Yes, the LMP7731MFX/NOPB can drive SAR ADCs directly, but requires careful layout: place a 10–100 pF isolation capacitor between the amplifier output and ADC input to absorb switching charge injection. Its 2.4 V/µs slew rate and low THD+N (0.001% @ 10 kHz) ensure fast settling and minimal distortion during acquisition windows.
What package type is used for the LMP7731MFX/NOPB?
The LMP7731MFX/NOPB uses a 5-pin SOT-23 package (TI package code DCU), with pin 1 marked by a dot. It measures 2.9 mm × 1.6 mm × 1.0 mm and has a thermal resistance θJA of 265°C/W - optimized for compact PCB layouts in portable instrumentation.
LMP7731MFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMP®, PowerWise®
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2.4V/µs
- Gain Bandwidth Product:
- 22 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 14 nA
- Voltage - Input Offset:
- 6 µV
- Current - Supply:
- 2.5mA
- Current - Output / Channel:
- 49 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-23-5
LMP7731MFX/NOPB FAQ
1.How can I place an order for LMP7731MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP7731MFX/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 LMP7731MFX/NOPB reliable?
The price and inventory of LMP7731MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP7731MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP7731MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP7731MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP7731MFX/NOPB?
LMP7731MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP7731MFX/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 LMP7731MFX/NOPB?
For technical support, including LMP7731MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP7731MFX/NOPB requirements.
6.How does Aetrix verify that LMP7731MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP7731MFX/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 LMP7731MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP7731MFX/NOPB?
All LMP7731MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP7731MFX/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 LMP7731MFX/NOPB part is unused and in its original packaging.
Return procedure for LMP7731MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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