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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments LMP2231BMA/NOPB

Name: LMP2231BMA/NOPB
Brand: Texas Instruments
SKU: LMP2231BMA/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMP2231BMA/NOPB

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LMP2231BMA/NOPB.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8SOIC

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Product details

Overview

LMP2231BMA/NOPB from Texas Instruments is a single micropower precision operational amplifier with CMOS inputs, designed for ultra-low-power sensor interface and battery-powered instrumentation. 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 features ±150 µV max input offset voltage and ±2.5 µV/°C max offset drift - enabling high-accuracy signal conditioning in portable medical devices and strain gauge amplifiers.

For engineers reviewing the LMP2231BMA/NOPB datasheet, LMP2231BMA/NOPB pinout, LMP2231BMA/NOPB application, or LMP2231BMA/NOPB equivalent, key selection criteria include its 1.6V minimum supply operation, 20 fA input bias current, 130 kHz gain-bandwidth product, −40°C to 125°C temperature range, and compatibility with single-supply ground-sensing configurations.

Technical Context

The LMP2231BMA/NOPB employs a CMOS input stage delivering femtoampere-level input bias current (±20 fA typical), enabling direct interfacing with high-impedance sensors such as thermocouples and piezoresistive bridges without significant error. Its precision architecture achieves ±150 µV max V_OS and ±2.5 µV/°C max TCV_OS, supported by 120 dB PSRR and 97 dB CMRR at 5V supply.

It features rail-to-rail output capable of swinging to within 15 mV of V+ or V− under 10 kΩ load, and maintains stable operation down to 1.6V supply while retaining 130 kHz GBW and 58 V/ms slew rate - making it suitable for low-voltage, low-noise, DC-coupled measurement paths where power budget and long-term drift are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.6V to 5.5V - enables operation from single Li-ion cell (3.0–3.7V) or two alkaline cells (up to 3.2V), plus extended life in 1.8V/2.5V microcontroller systems.
Supply Current	10 µA typical - reduces quiescent power to 16 µW at 1.6V, extending battery life in always-on wearable or remote sensor nodes.
Input Offset Voltage	±150 µV max - limits initial DC error to <0.015% of full-scale in 1V-range bridge amplifiers without trimming.
Offset Drift	±2.5 µV/°C max (LMP2231B grade) - contributes <0.3 mV error over 125°C industrial temperature span, supporting uncalibrated operation.
Input Bias Current	±20 fA typical - avoids loading errors in >1 GΩ source impedances (e.g., pH electrodes, photodiode transimpedance stages).
Gain-Bandwidth Product	130 kHz - supports stable closed-loop gains up to ~100× at DC–1 kHz for precision sensor front-ends.
Output Swing	Rail-to-rail, within 15 mV of V+ or V− - maximizes dynamic range in single-supply 3.3V or 5V systems with ADCs having 0–V_REF input ranges.
Operating Temperature	−40°C to +125°C - qualified for automotive cabin, industrial control, and downhole sensing environments.

Pinout & Package

Package: 5-Pin SOT-23 (DBV0005A). Compact surface-mount footprint (2.9 mm × 1.6 mm × 1.0 mm) optimized for space-constrained portable instrumentation.

Pin/Terminal	Circuit Role	Design Meaning
1 (V−)	Negative supply / ground reference	Accepts 0V (single-supply) or negative rail; common-mode range extends 200 mV below this pin.
2 (IN−)	Inverting input	High-impedance CMOS node; connects to feedback network or sensor reference leg in differential configurations.
3 (IN+)	Non-inverting input	High-impedance CMOS node; interfaces directly with high-Z sensors (e.g., thermocouple, strain gauge half-bridge).
4 (V+)	Positive supply	Supports 1.6V–5.5V; PSRR ≥120 dB ensures immunity to supply ripple in noisy battery-fed systems.
5 (OUT)	Amplified output	Rail-to-rail voltage source; drives ADC inputs, filters, or low-power comparators with minimal headroom loss.

Key Features

Feature	Design Value
Micropower operation	10 µA supply current enables >10-year battery life in coin-cell-powered IoT sensors (e.g., CR2032 @ 220 mAh).
Ultra-low input bias current	20 fA typical eliminates voltage error across >100 MΩ source impedances, critical for pH and ion-selective electrode circuits.
Precision DC performance	±150 µV V_OS and ±2.5 µV/°C TCV_OS reduce calibration frequency in field-deployed medical monitors and environmental loggers.
Rail-to-rail output	Swings to within 15 mV of V+ or V−, preserving >99% of 3.3V ADC full-scale range without level-shifting circuitry.
Wide supply range	1.6V minimum operation supports direct interface with energy-harvesting PMIC outputs (e.g., LTC3588-1) and low-V_GS MOSFET gate drivers.
High PSRR/CMRR	120 dB PSRR and 97 dB CMRR suppress supply noise and common-mode interference in noisy industrial 24V systems.

Applications

Precision Instrumentation Amplifiers	Battery Powered Medical Instrumentation
Use Scenario: Low-noise, low-drift amplification of millivolt-level signals from load cells and pressure transducers in handheld calibrators. IC Role / Device Role / Timing Role: Primary gain stage in 3-op-amp instrumentation topology; provides fixed-gain, high-CMRR front-end buffering. Use Value: ±150 µV V_OS and ±2.5 µV/°C drift ensure <0.02% FS error over temperature without auto-zero or chopper correction.	Use Scenario: Signal conditioning for ECG front-end in portable Holter monitors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: First-stage amplifier for biopotential electrodes; rejects electrode half-cell DC offsets while preserving sub-Hz bandwidth. Use Value: 20 fA input bias current prevents polarization errors on Ag/AgCl electrodes; 10 µA supply current extends monitor runtime to >72 hours.
High Impedance Sensors	Strain Gauge Bridge Amplifier
Use Scenario: Direct interface with 10 GΩ glass pH electrodes in portable water quality testers. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z sensor from downstream filtering and ADC sampling capacitance. Use Value: 20 fA input bias current limits DC error to <20 mV across 1 GΩ source impedance - eliminating need for guard rings or active guarding.	Use Scenario: Amplifying differential output of 350 Ω Wheatstone bridge in industrial torque sensors. IC Role / Device Role / Timing Role: Single-supply, ground-referenced difference amplifier with matched resistor network (e.g., Figure 1 in datasheet). Use Value: Rail-to-rail output delivers full 0–3.3V swing to SAR ADC; 1.6V min supply allows operation from same LDO powering MCU and radio.

Precision Instrumentation Amplifiers

Battery Powered Medical Instrumentation

Use Scenario: Low-noise, low-drift amplification of millivolt-level signals from load cells and pressure transducers in handheld calibrators.

IC Role / Device Role / Timing Role: Primary gain stage in 3-op-amp instrumentation topology; provides fixed-gain, high-CMRR front-end buffering.

Use Value: ±150 µV V_OS and ±2.5 µV/°C drift ensure <0.02% FS error over temperature without auto-zero or chopper correction.

Use Scenario: Signal conditioning for ECG front-end in portable Holter monitors powered by CR2032 coin cells.

IC Role / Device Role / Timing Role: First-stage amplifier for biopotential electrodes; rejects electrode half-cell DC offsets while preserving sub-Hz bandwidth.

Use Value: 20 fA input bias current prevents polarization errors on Ag/AgCl electrodes; 10 µA supply current extends monitor runtime to >72 hours.

High Impedance Sensors

Strain Gauge Bridge Amplifier

Use Scenario: Direct interface with 10 GΩ glass pH electrodes in portable water quality testers.

IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z sensor from downstream filtering and ADC sampling capacitance.

Use Value: 20 fA input bias current limits DC error to <20 mV across 1 GΩ source impedance - eliminating need for guard rings or active guarding.

Use Scenario: Amplifying differential output of 350 Ω Wheatstone bridge in industrial torque sensors.

IC Role / Device Role / Timing Role: Single-supply, ground-referenced difference amplifier with matched resistor network (e.g., Figure 1 in datasheet).

Use Value: Rail-to-rail output delivers full 0–3.3V swing to SAR ADC; 1.6V min supply allows operation from same LDO powering MCU and radio.

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 max drift vs. LMP2231BMA/NOPB's ±2.5 µV/°C; higher 17 µA supply current.	Better long-term stability in zero-calibration systems; less suitable for ultra-low-power (<15 µA) designs.	Select OPA333AIDBVR when drift-critical DC accuracy outweighs battery life; avoid if supply current must stay <12 µA.
MAX44260ASA+	Lower 1.2 µV/°C max drift; 1.8V–5.5V supply; 12 µA supply current; no SOT-23-5 package option (only 8-pin SOIC/SOT-23-8).	Higher drive strength (45 mA) supports heavier loads; larger package increases board area in space-constrained wearables.	Select MAX44260ASA+ when driving capacitive loads >100 pF or requiring lower drift than LMP2231B grade; verify PCB layout fits 8-pin footprint.

Compared with OPA333AIDBVR and MAX44260ASA+, the LMP2231BMA/NOPB uniquely balances ultra-low 10 µA supply current, 5-pin SOT-23 compactness, and ±2.5 µV/°C drift - making it optimal for cost-sensitive, size-constrained, battery-operated precision analog front-ends where moderate drift is acceptable.

Availability

LMP2231BMA/NOPB is available at Aetrix Electronics and suitable for precision instrumentation amplifiers, battery-powered medical instrumentation, and high-impedance sensor interfaces requiring stable component supply across automotive, industrial, and portable electronics programs.

Supply support for LMP2231BMA/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 LMP™ precision amplifier family, including the LMP2231BMA/NOPB, was engineered specifically for ultra-low-power, high-accuracy sensor signal conditioning in battery-constrained and wide-temperature industrial applications.

FAQ

What is the maximum input common-mode voltage range for the LMP2231BMA/NOPB?

The LMP2231BMA/NOPB supports a common-mode input voltage range extending 200 mV below the negative supply (V−) and up to 200 mV below the positive supply (V+) - for example, −0.2V to +3.1V at V+ = 3.3V and V− = 0V. This enables true ground-sensing capability in single-supply systems, critical for interfacing with bridge sensors referenced to system ground. The LMP2231BMA/NOPB maintains specified CMRR and V_OS across this full range.

Does the LMP2231BMA/NOPB support rail-to-rail input operation?

No, the LMP2231BMA/NOPB does not feature rail-to-rail input. Its input common-mode range extends 200 mV beyond the supplies (e.g., −0.2V to V+ − 0.2V), but it cannot accept signals at the exact supply rails. However, its CMOS input stage provides ultra-low bias current (20 fA) and high input impedance (>10¹² Ω), making it ideal for high-Z sources where input voltage stays within the specified common-mode window. For true rail-to-rail input, consider alternatives like the OPA333.

What is the guaranteed minimum gain-bandwidth product for the LMP2231BMA/NOPB across temperature?

The LMP2231BMA/NOPB guarantees a minimum gain-bandwidth product of 127 kHz at 1.8V supply and over the full −40°C to +125°C operating temperature range, as confirmed in the 1.8V AC Electrical Characteristics table. At 5V supply, the guaranteed minimum is 130 kHz. This ensures stable closed-loop performance in DC-coupled sensor amplifiers up to ~1 kHz bandwidth even under worst-case voltage and temperature conditions.

Can the LMP2231BMA/NOPB drive a 10 kΩ load while maintaining rail-to-rail output swing?

Yes - the LMP2231BMA/NOPB is fully specified to deliver rail-to-rail output swing (within 15 mV of V+ or V−) into a 10 kΩ load at all supply voltages from 1.6V to 5.5V and across the full −40°C to +125°C temperature range. This is verified in the DC Electrical Characteristics tables (e.g., "Output Swing High/Low" parameters) and enables direct interfacing with standard SAR ADC inputs without external level-shifting or gain adjustment.

How does the LMP2231BMA/NOPB differ from the LMP2231AMA/NOPB variant?

The LMP2231BMA/NOPB and LMP2231AMA/NOPB share identical packaging (5-pin SOT-23), pinout, and electrical specifications except for input offset voltage drift: the 'A' grade guarantees ±0.4 µV/°C max TCV_OS, while the 'B' grade guarantees ±2.5 µV/°C max. Both have ±150 µV max V_OS. The LMP2231BMA/NOPB is optimized for cost-sensitive applications where moderate drift is acceptable, whereas the 'A' grade targets high-stability metrology-grade systems. Supply current, bandwidth, and noise are identical between grades.

LMP2231BMA/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

LMP2231BMA/NOPB FAQ

1.How can I place an order for LMP2231BMA/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LMP2231BMA/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 LMP2231BMA/NOPB reliable?

The price and inventory of LMP2231BMA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP2231BMA/NOPB is usually 5 days.

3.What payment methods are accepted for LMP2231BMA/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP2231BMA/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMP2231BMA/NOPB?

LMP2231BMA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMP2231BMA/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 LMP2231BMA/NOPB?

For technical support, including LMP2231BMA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP2231BMA/NOPB requirements.

6.How does Aetrix verify that LMP2231BMA/NOPB is sourced from the original manufacturer or authorized distributors?

All LMP2231BMA/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 LMP2231BMA/NOPB meets industry standards.

7.What is the process for return or replacement of LMP2231BMA/NOPB?

All LMP2231BMA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP2231BMA/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 LMP2231BMA/NOPB part is unused and in its original packaging.

Return procedure for LMP2231BMA/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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