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Texas Instruments LMP7731MA/NOPB
- Part No.:
- LMP7731MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMP7731MA/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:466
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Product details
Overview
LMP7731MA/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 - making it ideal for photometric instrumentation and gas analysis sensor front-ends.
For engineers reviewing the LMP7731MA/NOPB datasheet, LMP7731MA/NOPB pinout, LMP7731MA/NOPB application, or LMP7731MA/NOPB equivalent, key selection criteria include ultra-low 1/f noise corner (3 Hz), rail-to-rail output swing within 13 mV of rails (RL = 2 kΩ), CMRR ≥129 dB, THD+N = 0.001% at 10 kHz, and guaranteed operation across −40°C to +125°C.
Technical Context
The LMP7731MA/NOPB employs a proprietary bipolar input stage with integrated input bias current cancellation circuitry, enabling ±1.5 nA bias current while retaining low voltage noise - a combination rare among precision op-amps. Its 1/f noise corner at 3 Hz ensures stable DC accuracy in slow-signal applications like photodiode transimpedance amplification.
It achieves rail-to-rail input via dual parallel input stages and rail-to-rail output using complementary output transistors. The 22 MHz GBW supports closed-loop gains up to 100× with usable bandwidth, and its 2.4 V/µs slew rate enables accurate settling for moderate-speed sensor signals without overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.9 nV/√Hz @ 1 kHz - enables high-resolution measurement of microvolt-level sensor outputs without noise floor degradation |
| Gain Bandwidth Product | 22 MHz - supports stable closed-loop gain ≥100 with >200 kHz bandwidth for fast settling in precision data acquisition |
| Open-Loop Gain | 130 dB - ensures <1 ppm gain error in unity-gain buffer or high-precision instrumentation amplifier configurations |
| CMRR | 130 dB (typ) - rejects common-mode interference from noisy power supplies or shared sensor grounds |
| Supply Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V logic, and legacy 5 V systems without level-shifting |
| Operating Temperature | −40°C to +125°C - qualified for industrial and automotive under-hood sensor interfaces |
| Input Bias Current | ±1.5 nA - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes) |
Pinout & Package
The LMP7731MA/NOPB is packaged in an industry-standard 5-pin SOT-23 surface-mount package (JEDEC MO-178AA), footprint-compatible with space-constrained portable and medical PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers rail-to-rail output swing (within 13 mV of either supply rail with RL = 2 kΩ); drives ADC inputs or downstream filters directly |
| 2 (−IN) | Inverting Input | Differential input node; features anti-parallel ESD diodes limiting differential input voltage to ±3 diode drops (~±2.1 V) |
| 3 (+IN) | Non-inverting Input | High-impedance input node (151 MΩ common-mode resistance); accepts signals from 0 V to VS with full CMRR performance |
| 4 (V−) | Negative Supply | Ground reference for single-supply operation; must be connected to system GND or negative rail |
| 5 (V+) | Positive Supply | Accepts 1.8–5.5 V; PSRR ≥117 dB suppresses supply ripple from battery or switching regulator noise |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in single-supply systems - e.g., 0–3.3 V ADC interface with no headroom loss |
| 2.9 nV/√Hz input voltage noise | Preserves SNR in low-level sensor amplification (e.g., photodiode currents <100 nA) without requiring external filtering |
| 1.5 nA input bias current with bipolar input | Eliminates need for guard rings or T-network compensation in high-Z sensor circuits (e.g., ion-selective electrodes) |
| 3 Hz 1/f noise corner | Ensures stable DC offset and minimal drift in long-integration measurements (e.g., gas concentration averaging over seconds) |
| 130 dB CMRR & PSRR | Maintains accuracy in electrically noisy environments (e.g., motor-driven medical pumps or industrial PLC I/O modules) |
Applications
| Photometric Instrumentation | Gas Analysis Instruments |
|---|---|
Use Scenario: Amplifying weak current from photodiodes in spectrophotometers measuring absorbance across UV-VIS-NIR wavelengths. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) front-end with low-noise, low-bias-current, and rail-to-rail output driving 16-bit SAR ADCs. Use Value: 2.9 nV/√Hz noise and 1.5 nA bias current enable sub-picoamp resolution without cooling or chopper stabilization. | Use Scenario: Signal conditioning for electrochemical sensors (e.g., CO, NO₂, O₃) in portable air quality monitors. IC Role / Device Role / Timing Role: Precision low-drift amplifier for µV-level sensor output, interfacing to low-power microcontrollers with integrated ADCs. Use Value: −40°C to +125°C rating and 130 dB CMRR ensure stable calibration across environmental temperature swings and EMI-rich field conditions. |
| Medical Instrumentation | Portable Battery-Powered Sensors |
Use Scenario: Front-end amplification for ECG/EEG biopotential electrodes in handheld diagnostic devices. IC Role / Device Role / Timing Role: High-input-impedance, low-noise instrumentation amplifier driver with rail-to-rail output compatible with 3.3 V ADC references. Use Value: 1.8 V minimum supply allows direct use with single Li-ion cells (2.7–4.2 V), extending battery life without boost converters. | Use Scenario: Signal chain for IoT environmental sensors (temperature, humidity, pressure) deployed in remote locations. IC Role / Device Role / Timing Role: Low-quiescent-current (2.2 mA) precision amplifier operating from coin-cell or energy-harvesting sources. Use Value: 22 MHz GBW enables fast wake-up settling (<1 µs to 0.01%) after sleep mode, minimizing active measurement time and power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA376AIDBVR | Lower input bias current (0.2 pA), higher voltage noise (4.5 nV/√Hz), 5.5 MHz GBW | Better for femtoamp current sources; insufficient bandwidth for >100 kHz sensor signals | Select when ultra-low bias dominates over noise/bandwidth requirements |
| ADA4898-1ARMZ | Higher voltage noise (1.1 nV/√Hz), wider GBW (65 MHz), higher supply current (10.5 mA) | Optimized for high-speed data acquisition; overqualified for DC-critical photometry | Select only when >20 MHz bandwidth and sub-1.2 nV/√Hz noise are mandatory |
Compared with OPA376AIDBVR and ADA4898-1ARMZ, the LMP7731MA/NOPB uniquely balances ultra-low 1/f noise corner (3 Hz), 22 MHz bandwidth, and 2.2 mA quiescent current - making it the optimal choice for battery-powered, DC-accurate sensor front-ends where noise, bias, and power must all be simultaneously minimized.
Availability
LMP7731MA/NOPB is available at Aetrix Electronics and suitable for photometric instrumentation, gas analysis instruments, and medical instrumentation requiring stable component supply, long-term manufacturability, and guaranteed −40°C to +125°C operation.
Supply support for LMP7731MA/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 LMP7731MA/NOPB belongs to TI's LMP™ precision amplifier family, engineered specifically for applications demanding simultaneous low noise, low input bias, rail-to-rail operation, and wide temperature range - especially sensor signal conditioning in portable and industrial equipment.
FAQ
What is the input voltage noise density of the LMP7731MA/NOPB at 1 kHz?
The LMP7731MA/NOPB has a typical input voltage noise density of 2.9 nV/√Hz at 1 kHz, measured with VS = 5 V and VCM = 2.5 V. This value is confirmed across 2.5 V, 3.3 V, and 5 V supply conditions and remains stable over the full −40°C to +125°C operating range. The LMP7731MA/NOPB also achieves a low 1/f corner frequency of 3 Hz, ensuring minimal low-frequency noise impact in DC-critical applications.
Does the LMP7731MA/NOPB support rail-to-rail input and output operation?
Yes, the LMP7731MA/NOPB supports true rail-to-rail input and output operation. Its input common-mode voltage range extends from V− to V+ (0 V to 5.5 V), and its output swings within 13 mV of either rail under 2 kΩ load. This capability is verified across all supply voltages (1.8 V to 5.5 V) and temperatures (−40°C to +125°C), enabling full utilization of ADC reference ranges in single-supply systems without external level-shifting circuitry.
What is the maximum supply current per channel for the LMP7731MA/NOPB?
The LMP7731MA/NOPB draws a typical supply current of 2.2 mA per channel at VS = 5 V and TA = 25°C, with a maximum specified value of 3.7 mA across the full operating temperature range (−40°C to +125°C) and supply range (1.8 V to 5.5 V). This low quiescent current enables extended battery life in portable instrumentation while maintaining 22 MHz bandwidth and 2.9 nV/√Hz noise performance - a key differentiator versus competing precision op-amps.
Can the LMP7731MA/NOPB drive capacitive loads such as ADC input sampling capacitors?
The LMP7731MA/NOPB is characterized for stability with capacitive loads up to 100 pF when using appropriate feedback network design. For direct connection to SAR ADC inputs (typically 10–30 pF sampling capacitance), a small series resistor (10–50 Ω) between the LMP7731MA/NOPB output and ADC input is recommended to isolate the capacitive load and prevent peaking or ringing. Phase margin remains ≥60° under these conditions, ensuring monotonic settling critical for 16-bit accuracy.
What package options are available for the LMP7731MA/NOPB?
The LMP7731MA/NOPB is offered exclusively in the 5-pin SOT-23 package (package code MA), per TI's official datasheet SNOSAT6E. It is not available in SOIC or other variants under this specific part number. The SOT-23 package measures 2.9 mm × 1.6 mm × 1.0 mm and is RoHS-compliant and lead-free (NOPB suffix), optimized for high-density PCB layouts in portable and medical devices.
LMP7731MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMP®, PowerWise®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
LMP7731MA/NOPB FAQ
1.How can I place an order for LMP7731MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP7731MA/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 LMP7731MA/NOPB reliable?
The price and inventory of LMP7731MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP7731MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMP7731MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP7731MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP7731MA/NOPB?
LMP7731MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP7731MA/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 LMP7731MA/NOPB?
For technical support, including LMP7731MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP7731MA/NOPB requirements.
6.How does Aetrix verify that LMP7731MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP7731MA/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 LMP7731MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMP7731MA/NOPB?
All LMP7731MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP7731MA/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 LMP7731MA/NOPB part is unused and in its original packaging.
Return procedure for LMP7731MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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