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Texas Instruments LMP2231AMA/NOPB
- Part No.:
- LMP2231AMA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMP2231AMA/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,893
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Product details
Overview
LMP2231AMA/NOPB from Texas Instruments is a single micropower precision operational amplifier with CMOS inputs, designed for ultra-low-power sensor interface and instrumentation applications. It operates from 1.6V to 5.5V, draws only 10 µA supply current, delivers rail-to-rail output swing within 15 mV of either rail, and maintains ±150 µV max input offset voltage with ±0.4 µV/°C max drift (LMP2231A grade) - enabling high-accuracy signal conditioning in battery-powered medical devices and strain gauge bridges.
For engineers reviewing the LMP2231AMA/NOPB datasheet, LMP2231AMA/NOPB pinout, LMP2231AMA/NOPB application, or LMP2231AMA/NOPB equivalent, key selection criteria include its 20 fA input bias current, 130 kHz gain-bandwidth product at 5V, 60 nV/√Hz input voltage noise at 1 kHz, –40°C to 125°C operating temperature range, and compatibility with 1.8V–5.5V single-supply systems requiring ground-sensing capability.
Technical Context
The LMP2231AMA/NOPB employs a CMOS input stage delivering femtoampere-level input bias current and high input impedance, making it suitable for interfacing with high-impedance sensors such as thermocouples and piezoresistive elements. Its precision architecture includes laser-trimmed input offset voltage and low-drift design, ensuring long-term stability without external calibration.
It features rail-to-rail output swing (15 mV from rails), extended common-mode input range (200 mV below negative supply), and robust PSRR (120 dB) and CMRR (97 dB), allowing reliable operation in noisy, low-voltage, single-supply environments where headroom is constrained and power efficiency is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 10 µA typical - enables multi-year battery life in portable medical monitors and IoT sensor nodes. |
| Operating Voltage Range | 1.6V to 5.5V - supports direct operation from single Li-ion, coin cell, or regulated 3.3V/2.5V rails. |
| Input Offset Voltage | ±150 µV max - reduces DC error in precision gain stages without trimming components. |
| Offset Voltage Drift | ±0.4 µV/°C max (LMP2231A) - ensures <1 µV total drift over 0–70°C industrial range. |
| Input Bias Current | ±20 fA typical - prevents loading errors in >1 GΩ source impedances (e.g., pH electrodes). |
| Gain-Bandwidth Product | 130 kHz at 5V - sufficient for DC–10 kHz sensor signal conditioning with stable unity-gain response. |
| Output Swing | Rail-to-rail, within 15 mV of V+ or V− - maximizes dynamic range in low-voltage ADC front-ends. |
Pinout & Package
The LMP2231AMA/NOPB is packaged in a 5-pin SOT-23 (DBV) surface-mount package with exposed pad for thermal enhancement and compact PCB layout.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply terminal - accepts 1.6V–5.5V; decoupling capacitor required near pin. |
| 2 | VIN− | Inverting input - high-impedance CMOS node; sensitive to leakage and ESD. |
| 3 | VIN+ | Non-inverting input - matched to VIN− for optimal CMRR and offset performance. |
| 4 | V− | Negative supply / ground terminal - supports true ground-sensing down to –0.2V common-mode. |
| 5 | VOUT | Amplified output - drives capacitive loads up to 100 pF while maintaining phase margin ≥70°. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 10 µA supply current enables >10-year battery life in continuous-monitoring wearable sensors. |
| Ultra-low input bias current | 20 fA typical eliminates voltage error across high-Z sources like thermocouples and photodiodes. |
| Rail-to-rail output | Swings within 15 mV of supply rails - preserves full ADC input range in 1.8V/2.5V systems. |
| Extended temperature range | Specified from –40°C to +125°C - qualified for automotive cabin and industrial control environments. |
| Low 1/f noise | 2.3 µVPP integrated 0.1–10 Hz noise - critical for DC-coupled precision measurement front-ends. |
Applications
| Precision Instrumentation Amplifiers | Battery-Powered Medical Instrumentation |
|---|---|
Use Scenario: Low-noise, DC-coupled amplification of microvolt-level biopotential signals (ECG, EEG) in portable diagnostic devices. IC Role / Device Role / Timing Role: Primary gain-stage op-amp in 3-op-amp instrumentation topology, providing high CMRR and minimal input loading. Use Value: 20 fA input bias current prevents electrode polarization errors; ±150 µV offset avoids baseline drift in analog front-end. |
Use Scenario: Signal conditioning for disposable glucose meters and pulse oximeters powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Transimpedance amplifier and reference buffer in optical sensor signal chain. Use Value: 10 µA quiescent current extends battery life beyond 2 years; rail-to-rail output interfaces directly with 12-bit SAR ADCs. |
| High-Impedance Sensors | Strain Gauge Bridge Amplifier |
Use Scenario: Interfacing pH electrodes, ion-selective electrodes, or MEMS capacitive sensors with output impedances >10 GΩ. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z sensor from downstream circuitry. Use Value: 20 fA input bias current limits DC error to <200 µV at 10 GΩ source impedance - eliminating need for guard rings or active guarding. |
Use Scenario: Amplifying differential output of quarter-bridge strain gauges in structural health monitoring and load cells. IC Role / Device Role / Timing Role: First-stage differential amplifier with fixed gain in Wheatstone bridge readout circuit. Use Value: ±0.4 µV/°C TCVOS minimizes temperature-induced zero-shift; 120 dB PSRR rejects supply ripple from shared battery rails. |
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 | Lower offset (±10 µV max), higher supply current (17 µA), same 5-pin SOT-23 package. | Better DC accuracy but reduced battery life in ultra-low-power designs. | Choose OPA333AIDBVR when offset-critical DC measurements outweigh micropower requirements. |
| MAX44260ASA+ | Higher GBW (500 kHz), higher supply current (35 µA), 8-pin SOIC only - no 5-pin SOT-23 option. | Supports faster settling but requires larger board area and higher power budget. | Choose MAX44260ASA+ when bandwidth >200 kHz is required and PCB space allows SOIC footprint. |
Compared with OPA333AIDBVR and MAX44260ASA+, the LMP2231AMA/NOPB uniquely balances sub-15 µA supply current, 20 fA input bias, and 5-pin SOT-23 packaging - making it optimal for space-constrained, multi-year battery-operated sensor nodes where both accuracy and energy efficiency are non-negotiable.
Availability
LMP2231AMA/NOPB is available at Aetrix Electronics and suitable for precision instrumentation amplifiers, battery-powered medical instrumentation, and high-impedance sensor interface applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature and voltage ranges.
Supply support for LMP2231AMA/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 expertise in precision signal chain solutions.
The LMP2231AMA/NOPB belongs to TI's LMP™ precision amplifier family, engineered specifically for ultra-low-power, high-accuracy sensor signal conditioning in portable and harsh-environment applications.
FAQ
What is the maximum operating supply voltage for the LMP2231AMA/NOPB?
The LMP2231AMA/NOPB has an absolute maximum supply voltage of 6V, but its specified operating range is 1.6V to 5.5V. Operation above 5.5V risks exceeding electrical limits and invalidates guaranteed performance per the datasheet. For reliable long-term use, keep V+ ≤ 5.5V and ensure proper decoupling at the V+ pin.
Does the LMP2231AMA/NOPB support true ground-sensing operation?
Yes, the LMP2231AMA/NOPB supports true ground-sensing: its common-mode input voltage range extends 200 mV below the negative supply rail (V−), allowing VIN− and VIN+ to operate at 0V when V− = 0V. This enables accurate amplification of signals referenced to system ground in single-supply configurations.
What is the guaranteed input offset voltage specification for LMP2231AMA/NOPB?
The LMP2231AMA/NOPB is the LMP2231A-grade device, with a guaranteed maximum input offset voltage of ±150 µV over temperature (–40°C to +125°C). This is confirmed in the Electrical Characteristics table under "5V DC Electrical Characteristics" with boldface max limits applying at temperature extremes.
Can the LMP2231AMA/NOPB drive capacitive loads reliably?
Yes - the LMP2231AMA/NOPB maintains ≥70° phase margin with capacitive loads up to 100 pF when driving into RL = 10 kΩ, as verified in Figure 38 (Phase Margin vs. Capacitive Load). For loads >100 pF, external isolation resistance or feedback compensation is recommended to preserve stability.
Is the LMP2231AMA/NOPB RoHS-compliant and lead-free?
Yes, the LMP2231AMA/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) packaging per TI's standard product marking convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for floor life.
LMP2231AMA/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:
- 0.058V/µs
- Gain Bandwidth Product:
- 130 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.02 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 10µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 1.6 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
LMP2231AMA/NOPB FAQ
1.How can I place an order for LMP2231AMA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP2231AMA/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 LMP2231AMA/NOPB reliable?
The price and inventory of LMP2231AMA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP2231AMA/NOPB is usually 5 days.
3.What payment methods are accepted for LMP2231AMA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP2231AMA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP2231AMA/NOPB?
LMP2231AMA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP2231AMA/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 LMP2231AMA/NOPB?
For technical support, including LMP2231AMA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP2231AMA/NOPB requirements.
6.How does Aetrix verify that LMP2231AMA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP2231AMA/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 LMP2231AMA/NOPB meets industry standards.
7.What is the process for return or replacement of LMP2231AMA/NOPB?
All LMP2231AMA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP2231AMA/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 LMP2231AMA/NOPB part is unused and in its original packaging.
Return procedure for LMP2231AMA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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