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Texas Instruments LMP2021MFX/NOPB
- Part No.:
- LMP2021MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMP2021MFX/NOPB.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:13,380
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Product details
Overview
LMP2021MFX/NOPB from Texas Instruments is a single-channel zero-drift precision operational amplifier designed for ultra-high DC accuracy in sensor signal conditioning and low-frequency measurement circuits. It delivers ±5 µV max input offset voltage, −0.004 µV/°C typical offset drift, 11 nV/√Hz input voltage noise at 1 kHz (AV = 1000), 160 dB open-loop gain, and operates from 2.2 V to 5.5 V supply. It is used in high-resolution bridge amplifiers, thermocouple interfaces, and 24-bit weigh scale front-ends.
For engineers reviewing the LMP2021MFX/NOPB datasheet, LMP2021MFX/NOPB pinout, LMP2021MFX/NOPB application, or LMP2021MFX/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT-23-5 pin functions, EMI-hardened performance data, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LMP2021MFX/NOPB employs proprietary continuous auto-zero correction to eliminate 1/f noise and suppress input offset drift - achieving ±0.02 µV/°C max over −40°C to +125°C. Its on-chip EMI filtering provides ≥79 dB EMIRR at 2.4 GHz, enabling reliable operation near cellular/Wi-Fi transceivers without external RF shielding.
This amplifier features rail-to-rail output swing (e.g., 83 mV from rail at 5 V, RL = 10 kΩ), 2.6 V/µs slew rate, 5 MHz gain-bandwidth product, and 139 dB CMRR at 5 V - all while drawing only 1.1 mA per amplifier. Its 12 pF differential input capacitance and ±25 pA input bias current support high-impedance sensor interfaces without significant loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (max) | ±5 µV - ensures ≤0.0005% gain error in 1000× instrumentation amplifier stages at room temperature |
| Offset Drift (max) | ±0.02 µV/°C - enables <1 µV total drift over full industrial temperature range (−40°C to +125°C) |
| Input Voltage Noise (0.1–10 Hz) | 260 nVPP - supports sub-µV-level signal resolution in precision weigh scales and strain gauge bridges |
| Open-Loop Gain | 160 dB - reduces gain nonlinearity to <0.001% in high-gain (≥100×) transducer amplifier configurations |
| EMI Rejection Ratio (2.4 GHz) | 79 dB - rejects >99.99% of 2.4 GHz RF interference at inputs, eliminating need for external ferrite beads or RC filters |
| Supply Current (per amp) | 1.1 mA - enables battery-powered operation for >1 year in 10 µA sleep-cycle systems using duty-cycled sampling |
| Output Swing (5 V, RL = 10 kΩ) | 83 mV from rail - allows full-scale utilization of 24-bit ADCs with 5 V reference without clipping |
Pinout & Package
LMP2021MFX/NOPB is packaged in a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and 0.95 mm height. The package is RoHS-compliant, halogen-free, and rated for operation up to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Output | Amplified differential signal output; rail-to-rail capable, drives ≥10 kΩ loads with <83 mV headroom at 5 V |
| 2 - V− | Negative Supply | Ground or negative rail connection; must be decoupled with 0.1 µF ceramic capacitor within 2 mm of pin |
| 3 - +IN | Non-Inverting Input | High-impedance (≥1013 Ω) input node; connects directly to sensor positive terminal or reference divider |
| 4 - −IN | Inverting Input | Differential input node; used for feedback network connection or sensor negative terminal in single-ended configs |
| 5 - V+ | Positive Supply | Primary power rail (2.2–5.5 V); requires local 0.1 µF + 1 µF parallel decoupling for EMI immunity |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Continuous auto-zero correction eliminates 1/f noise and holds offset drift ≤0.02 µV/°C across full temp range |
| EMI-hardened inputs | On-die RF filters provide ≥79 dB rejection at 2.4 GHz, enabling direct PCB placement near wireless modules |
| Rail-to-rail output | Swings within 83 mV of rails at 5 V, maximizing dynamic range when driving SAR or delta-sigma ADCs |
| Low input bias current | ±25 pA typical enables use with >100 MΩ source impedances (e.g., pH electrodes, piezoresistive sensors) |
| High CMRR & PSRR | 139 dB CMRR and 130 dB PSRR minimize error from common-mode shifts and supply ripple in noisy environments |
Applications
| Thermocouple Amplifier | Bridge Sensor Interface |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type-K thermocouples across −40°C to +125°C ambient, with cold-junction compensation. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low drift and no 1/f noise to preserve thermal resolution below 0.01°C. Use Value: Enables direct thermocouple-to-ADC interfacing without calibration; ±5 µV offset contributes <0.12°C error at 25°C, and −0.004 µV/°C drift adds <0.003°C/°C error over range. |
Use Scenario: Conditioning output of 350 Ω full-bridge load cells in industrial weighing systems requiring 24-bit resolution. IC Role / Device Role / Timing Role: Low-noise, low-drift instrumentation amplifier front-end with 260 nVPP 0.1–10 Hz noise floor. Use Value: Supports true 24-bit effective resolution: 260 nVPP noise corresponds to ~1.6 LSB of a 2.5 V, 24-bit ADC (≈149 nV/LSB). |
| Battery-Powered Data Logger | Medical Sensor Front-End |
|
Use Scenario: Signal conditioning for portable environmental monitors measuring CO₂, humidity, and pressure with 10-year field deployment. IC Role / Device Role / Timing Role: Ultra-stable gain block operating from coin-cell (3 V) or Li-ion (3.3–4.2 V) supplies with <1.1 mA quiescent current. Use Value: 1.1 mA supply current extends 200 mAh CR2032 battery life to >12 months in continuous 1 Hz sampling mode. |
Use Scenario: Amplifying microvolt-level biopotential signals (ECG, EEG) in handheld diagnostic devices with strict EMC requirements. IC Role / Device Role / Timing Role: EMI-hardened analog front-end rejecting cellular/Wi-Fi interference without shielded enclosures or layout constraints. Use Value: 79 dB EMIRR at 2.4 GHz prevents RF-induced baseline wander or false arrhythmia detection in clinical-grade ECG acquisition. |
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 max offset (±2 µV) but higher 0.1–10 Hz noise (550 nVPP); same SOT-23-5 package; no specified EMIRR data | Preferred for ultra-low-offset DC apps where RF immunity is secondary; not recommended for wireless-adjacent designs | Select OPA333AIDBVR only if system lacks RF sources and requires tighter initial offset spec; verify noise budget separately |
| ADA4522-1ARMZ | Higher precision (±0.3 µV max offset, 0.005 µV/°C drift) but larger 8-lead MSOP package; 5.5 MHz GBW; no published EMIRR | Suitable for lab-grade instruments where board space allows and EMI is managed externally | Choose ADA4522-1ARMZ when long-term stability dominates over size/power/EMI; avoid in compact wireless-connected devices |
Compared with LMP2021MFX/NOPB, OPA333AIDBVR trades EMI hardening for lower initial offset, while ADA4522-1ARMZ offers superior drift performance at the cost of larger footprint and unverified RF immunity - making LMP2021MFX/NOPB the optimal choice for space-constrained, wireless-adjacent industrial and medical sensing.
Availability
LMP2021MFX/NOPB is available at Aetrix Electronics and suitable for precision instrumentation, battery-powered sensor nodes, and medical diagnostics requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LMP2021MFX/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 heritage in precision signal chain solutions.
The LMP™ precision amplifier family - including LMP2021MFX/NOPB - was engineered specifically for high-accuracy sensor interface applications demanding ultra-low drift, zero 1/f noise, and robustness against electromagnetic interference in real-world industrial and medical environments.
FAQ
What is the maximum operating temperature for LMP2021MFX/NOPB?
LMP2021MFX/NOPB is rated for continuous operation from −40°C to +125°C ambient temperature. Its internal junction temperature limit is 150°C, and thermal resistance (RθJA) is 164°C/W in the SOT-23-5 package - allowing safe operation at full rating with minimal PCB copper area under typical 1.1 mA supply current conditions.
Does LMP2021MFX/NOPB support rail-to-rail input?
No, LMP2021MFX/NOPB does not feature rail-to-rail input. Its input common-mode voltage range is specified as −0.2 V to 4.2 V at 5 V supply (0 V to 4.0 V over full temperature range). It requires ≥0.2 V headroom below V− and ≥0.8 V headroom below V+ for guaranteed CMRR performance, unlike true RRI op-amps.
Can LMP2021MFX/NOPB drive a 10 kΩ load at 5 V supply?
Yes, LMP2021MFX/NOPB can drive a 10 kΩ load at 5 V supply with full rail-to-rail output swing capability: output swings within 83 mV of either rail (high-side) and 65 mV (low-side) at 25°C, meeting specifications across −40°C to +125°C with appropriate decoupling and layout.
Is LMP2021MFX/NOPB suitable for driving ADC inputs?
Yes, LMP2021MFX/NOPB is widely used to drive precision SAR and delta-sigma ADCs. Its 160 dB open-loop gain minimizes gain error, 260 nVPP 0.1–10 Hz noise preserves ENOB in 24-bit converters, and rail-to-rail output ensures full utilization of the ADC's input range without external level-shifting circuitry.
What decoupling is required for stable operation of LMP2021MFX/NOPB?
LMP2021MFX/NOPB requires a minimum 0.1 µF X7R ceramic capacitor placed within 2 mm of pins 2 (V−) and 5 (V+), plus a bulk 1 µF tantalum or ceramic capacitor nearby. This dual-stage decoupling maintains PSRR >110 dB and ensures EMI filter effectiveness - especially critical for its specified 79 dB EMIRR at 2.4 GHz.
LMP2021MFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMP®
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.6V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 0.4 µV
- Current - Supply:
- 1.1mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.2 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
LMP2021MFX/NOPB FAQ
1.How can I place an order for LMP2021MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP2021MFX/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 LMP2021MFX/NOPB reliable?
The price and inventory of LMP2021MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP2021MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP2021MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP2021MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP2021MFX/NOPB?
LMP2021MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP2021MFX/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 LMP2021MFX/NOPB?
For technical support, including LMP2021MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP2021MFX/NOPB requirements.
6.How does Aetrix verify that LMP2021MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP2021MFX/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 LMP2021MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP2021MFX/NOPB?
All LMP2021MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP2021MFX/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 LMP2021MFX/NOPB part is unused and in its original packaging.
Return procedure for LMP2021MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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