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Texas Instruments LMP2231BMFX/NOPB
- Part No.:
- LMP2231BMFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMP2231BMFX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
LMP2231BMFX/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 achieves ±150 µV max input offset voltage with ±2.5 µV/°C max drift (LMP2231B grade), enabling high-accuracy signal conditioning in battery-powered medical devices.
For engineers reviewing the LMP2231BMFX/NOPB datasheet, LMP2231BMFX/NOPB pinout, LMP2231BMFX/NOPB application, or LMP2231BMFX/NOPB equivalent, key selection criteria include its 20 fA input bias current, 130 kHz gain-bandwidth product, 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 LMP2231BMFX/NOPB implements a CMOS-input, micropower op-amp architecture optimized for precision DC-coupled amplification in energy-constrained environments. Its input stage uses high-impedance CMOS transistors to achieve 20 fA typical input bias current and supports common-mode input voltages extending 200 mV below the negative rail - critical for single-supply ground-referenced sensing.
Internally compensated for unity-gain stability with 130 kHz GBW and 58 V/ms slew rate, it maintains 120 dB open-loop gain and 120 dB PSRR across its full 1.6V–5.5V supply range. The rail-to-rail output stage delivers >27 mA sourcing/sinking capability at 5V while maintaining low distortion (0.002% THD+N) and phase margin ≥78° into 20 pF capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 10 µA typical - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Input Offset Voltage | ±150 µV max - ensures <0.015% gain error in 10 V full-scale precision amplifiers without trimming. |
| Offset Drift | ±2.5 µV/°C max (LMP2231B) - limits thermal-induced error to <0.3 mV over 125°C industrial temperature range. |
| Input Bias Current | 20 fA typical - preserves signal integrity when amplifying high-impedance sources (e.g., pH electrodes, piezoresistive sensors). |
| Gain-Bandwidth Product | 130 kHz - supports stable DC-to-10 kHz signal conditioning for ECG, strain gauge, and thermocouple interfaces. |
| Rail-to-Rail Output | Swings within 15 mV of V+ and V− - maximizes dynamic range in 1.8V–3.3V microcontroller ADC front-ends. |
| Common-Mode Range | Extends 200 mV below V− - enables direct amplification of 0 V–VREF sensor outputs in single-supply systems. |
Pinout & Package
Package: 5-Pin SOT-23 (DBV0005A), footprint-compatible with industry-standard SC-70-5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output | Amplified signal node; rail-to-rail capable with 27 mA sourcing capability at 5V. |
| 2 (IN−) | Inverting Input | Differential input terminal; 20 fA bias current minimizes loading on high-Z feedback networks. |
| 3 (IN+) | Non-Inverting Input | Differential input terminal; supports common-mode voltages down to V− − 0.2 V for ground-sensing. |
| 4 (GND / V−) | Negative Supply / Ground | Reference node for single-supply operation; also serves as return path for output current. |
| 5 (V+) | Positive Supply | Power input; accepts 1.6V–5.5V; PSRR of 120 dB suppresses supply ripple in noisy embedded systems. |
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 errors across >100 MΩ sensor impedances (e.g., glass pH electrodes). |
| Precision DC Performance | ±150 µV VOS and ±2.5 µV/°C TCVOS support uncalibrated 16-bit measurement accuracy over temperature. |
| Rail-to-Rail Output | 15 mV from rails at 10 kΩ load preserves >99% of supply voltage headroom for maximum ADC utilization. |
| Wide Supply Range | 1.6V–5.5V operation allows direct interfacing with Li-ion, alkaline, and regulated 3.3V/1.8V system rails. |
Applications
| ECG Front-End Amplifier | Strain Gauge Bridge Interface |
|---|---|
Use Scenario: Amplifying microvolt-level cardiac signals from dry-electrode ECG patches in ambulatory monitors. IC Role / Device Role / Timing Role: Primary DC-coupled instrumentation amplifier stage with high CMRR and ultra-low noise. Use Value: 20 fA input bias current prevents electrode polarization; 60 nV/√Hz noise ensures >80 dB SNR for 0.5–40 Hz bandwidth. |
Use Scenario: Conditioning Wheatstone bridge outputs from load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Low-drift, low-noise difference amplifier with programmable gain via external resistors. Use Value: ±150 µV VOS and ±2.5 µV/°C drift minimize zero-point drift; rail-to-rail output drives 12-bit SAR ADCs directly. |
| Thermocouple Cold-Junction Compensation | Portable Gas Sensor Signal Chain |
Use Scenario: Amplifying µV-level thermocouple outputs while measuring cold-junction temperature with an integrated RTD. IC Role / Device Role / Timing Role: Precision low-noise amplifier with extended common-mode range for dual-sensor integration. Use Value: Common-mode input down to V− − 0.2 V enables simultaneous thermocouple and RTD biasing from single 3.3V rail. |
Use Scenario: Signal conditioning for electrochemical gas sensors with high source impedance (>100 kΩ) and sub-µA output currents. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) front-end with ultra-low input current error. Use Value: 20 fA input bias current reduces TIA gain error to <0.02% at 100 kΩ feedback; 130 kHz GBW supports fast response to gas concentration changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Lower VOS (±10 µV max) but higher supply current (17 µA); same 5-pin SOT-23 package. | Better DC accuracy for calibration-critical systems; less suitable for multi-year battery life requirements. | Select OPA333AIDBVR when VOS budget is <20 µV and power is secondary; retain LMP2231BMFX/NOPB for <10 µA constraints. |
| MAX40007AUT+T | Higher supply current (35 µA); includes internal ESD protection diodes; same 1.6V–5.5V range. | More robust in field-deployed industrial sensors exposed to ESD; trades power efficiency for ruggedness. | Choose MAX40007AUT+T for harsh environments where ESD immunity is prioritized over micropower operation. |
Compared with OPA333AIDBVR and MAX40007AUT+T, the LMP2231BMFX/NOPB uniquely balances ultra-low 10 µA quiescent current, 20 fA input bias, and ±150 µV VOS in a 5-pin SOT-23 - making it optimal for long-life, high-impedance, single-supply sensor nodes where both precision and power are non-negotiable.
Availability
LMP2231BMFX/NOPB is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, precision instrumentation amplifiers, and high-impedance sensor interfaces requiring stable component supply and guaranteed long-term availability.
Supply support for LMP2231BMFX/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 LMP2231BMFX/NOPB belongs to TI's LMP™ precision amplifier family, engineered specifically for micropower, high-accuracy sensor signal conditioning in portable and industrial instrumentation where low VOS, ultra-low IB, and wide supply range are essential.
FAQ
What is the maximum operating temperature for the LMP2231BMFX/NOPB?
The LMP2231BMFX/NOPB is rated for continuous operation from –40°C to +125°C. This extended temperature range is validated per TI's production testing and enables reliable use in automotive under-hood modules, industrial process controllers, and outdoor medical monitoring equipment where ambient temperatures exceed standard commercial limits. The LMP2231BMFX/NOPB maintains its ±150 µV VOS and ±2.5 µV/°C drift specifications across this full range.
Does the LMP2231BMFX/NOPB support true rail-to-rail input operation?
No, the LMP2231BMFX/NOPB does not support rail-to-rail input. Its common-mode input voltage range extends 200 mV below the negative supply (V− − 0.2 V) and up to V+ − 1.2 V at 5V supply, but it cannot accept inputs at the positive rail. However, its ability to operate with inputs 200 mV below ground makes it ideal for single-supply ground-sensing applications - a key differentiator from many competing micropower op-amps.
What is the significance of the 'B' suffix in LMP2231BMFX/NOPB?
The 'B' in LMP2231BMFX/NOPB designates the input offset voltage drift grade: ±2.5 µV/°C maximum (vs. ±0.4 µV/°C for the 'A' grade). This grade offers tighter drift control than standard micropower op-amps while retaining the 10 µA supply current and 20 fA input bias current. It is selected when long-term stability over temperature is required but the highest-grade 'A' variant is cost-prohibitive or unnecessary for the application's accuracy target.
Can the LMP2231BMFX/NOPB drive capacitive loads directly?
Yes, the LMP2231BMFX/NOPB is internally compensated for unity-gain stability and can safely drive up to 20 pF capacitive loads without oscillation, as verified by phase margin ≥78° in TI's characterization. For loads exceeding 20 pF, an external isolation resistor (e.g., 10–100 Ω) between the output and capacitance is recommended to maintain stability - a common practice in ADC driver and filter applications where parasitic capacitance accumulates.
Is the LMP2231BMFX/NOPB pin-compatible with other members of the LMP223x family?
Yes, the LMP2231BMFX/NOPB in 5-pin SOT-23 shares identical pinout with the dual LMP2232 and quad LMP2234 in their respective SOIC and VSSOP packages for corresponding channel 1 pins. However, direct substitution requires verifying supply current, output drive, and thermal dissipation requirements - the LMP2231BMFX/NOPB's 10 µA draw and 160.6 °C/W θJA are specific to its 5-pin SOT-23 package and must be re-evaluated in multi-channel layouts.
LMP2231BMFX/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:
- 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:
- SOT-23-5
LMP2231BMFX/NOPB FAQ
1.How can I place an order for LMP2231BMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP2231BMFX/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 LMP2231BMFX/NOPB reliable?
The price and inventory of LMP2231BMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP2231BMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP2231BMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP2231BMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP2231BMFX/NOPB?
LMP2231BMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP2231BMFX/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 LMP2231BMFX/NOPB?
For technical support, including LMP2231BMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP2231BMFX/NOPB requirements.
6.How does Aetrix verify that LMP2231BMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP2231BMFX/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 LMP2231BMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP2231BMFX/NOPB?
All LMP2231BMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP2231BMFX/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 LMP2231BMFX/NOPB part is unused and in its original packaging.
Return procedure for LMP2231BMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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