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Texas Instruments LMP2021MAX/NOPB
- Part No.:
- LMP2021MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMP2021MAX/NOPB.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:280
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Product details
Overview
LMP2021MAX/NOPB from Texas Instruments is a single-channel zero-drift precision operational amplifier designed for ultra-high-DC-accuracy signal conditioning in sensor interfaces and instrumentation front-ends. 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 - enabling high-resolution bridge amplifier and thermocouple amplifier designs with sub-µV error budgets.
For engineers reviewing the LMP2021MAX/NOPB datasheet, LMP2021MAX/NOPB pinout, LMP2021MAX/NOPB application, or LMP2021MAX/NOPB equivalent, key selection criteria include verified EMI-hardened performance (EMIRR up to 82 dB at 2.4 GHz), rail-to-rail output swing (≤135 mV from rail at 5 V, RL = 10 kΩ), and guaranteed operation across −40°C to +125°C industrial temperature range - critical for battery-powered medical sensors and weigh-scale systems requiring long-term calibration stability.
Technical Context
The LMP2021MAX/NOPB employs proprietary continuous auto-zero correction to eliminate 1/f noise and suppress input offset drift, achieving near-zero DC error accumulation over time and temperature. Its internal EMI filtering architecture rejects RF interference at both inputs and power pins, with measured EMIRR of 82 dB at 2.4 GHz under 5 V supply - directly addressing RF-induced offset modulation in wireless-adjacent sensor nodes.
This amplifier features a 5 MHz gain-bandwidth product and 2.6 V/µs slew rate, supporting stable closed-loop operation with gains up to 1000 while maintaining <260 nVPP integrated input noise (0.1 Hz–10 Hz). Its 139 dB CMRR and 130 dB PSRR ensure minimal error from common-mode shifts or supply ripple in high-gain transducer interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (Max) | ±5 µV - ensures ≤0.001% gain error in 5 V full-scale 16-bit ADC buffer applications |
| Offset Drift (Typ) | −0.004 µV/°C - contributes <0.1 µV total drift over 0–70°C ambient, enabling uncalibrated 24-bit system accuracy |
| Input Voltage Noise (0.1–10 Hz) | 260 nVPP - supports sub-1 µV resolution in low-frequency bridge measurements without external filtering |
| Open-Loop Gain | 160 dB - reduces gain error to <0.001% in 100× non-inverting configurations |
| Supply Range | 2.2 V to 5.5 V - enables direct interface with Li-ion (3.0–4.2 V) and USB-powered (5 V) portable instrumentation |
| EMI Rejection Ratio | 82 dB at 2.4 GHz - eliminates need for external RF shielding in Bluetooth/Wi-Fi co-location designs |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensor signal conditioning and industrial process controllers |
Pinout & Package
Package: 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified differential output; rail-to-rail swing supports direct drive of SAR ADC reference buffers |
| 2 | Inverting Input (−IN) | Differential input node; high-impedance (±25 pA bias current) preserves bridge sensor balance |
| 3 | Non-Inverting Input (+IN) | Differential input node; matched to −IN for optimal CMRR and offset cancellation |
| 4 | Negative Supply (V−) | Ground or negative rail connection; required for dual-supply operation or single-supply referenced to mid-rail |
| 5 | Positive Supply (V+) | Primary power input; accepts 2.2–5.5 V; internal EMI filters protect against RF coupling on this pin |
| 6–8 | No Internal Connection (N/C) | Unbonded die pads; must remain floating - no PCB trace or thermal pad connection permitted |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates 1/f noise and drift-induced baseline wander in multi-hour static measurements |
| On-chip EMI filtering | Rejects cellular/Wi-Fi RF energy at inputs and supplies without external ferrites or RC networks |
| Rail-to-rail output | Delivers >97% of full-scale swing into 10 kΩ load - maximizes dynamic range for 5 V ADCs |
| Ultra-low input bias current | ±25 pA typical enables use with high-impedance pH electrodes and piezoresistive sensors |
| High open-loop gain | 160 dB ensures <0.001% gain error in precision instrumentation amplifier configurations |
Applications
| Thermocouple Amplifier | Bridge Sensor Interface |
|---|---|
Use Scenario: Amplifying microvolt-level Seebeck voltages from K-type thermocouples across −200°C to +1372°C with cold-junction compensation. IC Role / Device Role / Timing Role: Primary DC-coupled gain stage with ultra-low drift and noise to preserve thermocouple's inherent 10 µV/°C sensitivity. Use Value: Enables <±0.1°C measurement accuracy without periodic recalibration due to <0.004 µV/°C drift and 260 nVPP 0.1–10 Hz noise. | Use Scenario: Conditioning output of 350 Ω strain-gauge Wheatstone bridges in industrial load cells and pressure transducers. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver with matched input impedance and high CMRR to reject bridge excitation noise. Use Value: Delivers 139 dB CMRR and 160 dB open-loop gain to resolve <1 ppm bridge imbalance - supporting 24-bit ADC digitization. |
| Battery-Powered Precision DMM | Medical ECG Front-End |
Use Scenario: High-impedance voltage/current measurement path in handheld digital multimeters operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Low-power, rail-to-rail input/output op-amp for autoranging attenuator and programmable gain amplifier stages. Use Value: 1.1 mA supply current and 2.2–5.5 V operation extend battery life; ±5 µV offset ensures <0.005% basic accuracy in 7½-digit modes. | Use Scenario: Amplifying 0.5–5 mV cardiac signals in portable ECG monitors with integrated Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Ultra-low-noise, EMI-hardened first gain stage placed adjacent to antenna and digital subsystems. Use Value: 82 dB EMIRR at 2.4 GHz prevents RF demodulation artifacts; 11 nV/√Hz noise preserves diagnostic ST-segment fidelity. |
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 quiescent current (17 µA vs. 1.1 mA), but higher 0.1–10 Hz noise (5.5 µVPP vs. 260 nVPP); 36 V max supply | Better for ultra-low-power (<10 µA) battery lifetime-critical designs; unsuitable for high-resolution low-noise sensing | Select OPA333AIDBVR only when µA-level supply current outweighs noise and drift requirements |
| AD8628ARZ | Higher offset drift (0.03 µV/°C max vs. 0.02 µV/°C), identical 260 nVPP noise, lower EMIRR (65 dB at 900 MHz) | Acceptable where RF immunity is secondary; less robust in Wi-Fi/Bluetooth proximity | Choose AD8628ARZ if cost sensitivity dominates and EMI environment is controlled |
Compared with OPA333AIDBVR and AD8628ARZ, the LMP2021MAX/NOPB uniquely balances ultra-low drift (−0.004 µV/°C), industry-leading EMI rejection (82 dB at 2.4 GHz), and sub-µV noise - making it the only option among the three qualified for unshielded, battery-powered, 24-bit industrial weigh scales operating in RF-rich environments.
Availability
LMP2021MAX/NOPB is available at Aetrix Electronics and suitable for precision instrumentation amplifiers, battery-powered medical sensors, and industrial bridge transducer interfaces requiring stable component supply across extended temperature and EMI-exposed conditions.
Supply support for LMP2021MAX/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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMP2021MAX/NOPB belongs to TI's LMP™ precision op-amp family, engineered specifically for high-accuracy sensor signal chains where long-term DC stability, low-frequency noise, and RF immunity are non-negotiable design requirements.
FAQ
What is the maximum input offset voltage specification for LMP2021MAX/NOPB over temperature?
The LMP2021MAX/NOPB has a maximum input offset voltage of ±10 µV across the full −40°C to +125°C operating temperature range, as specified in Section 6.5 and 6.6 of the SNOSAY9G datasheet. At 25°C, the limit is tighter: ±5 µV. This guaranteed worst-case value ensures predictable gain error in high-precision closed-loop circuits regardless of ambient conditions.
Does LMP2021MAX/NOPB support rail-to-rail input operation?
No, the LMP2021MAX/NOPB does not support 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 temperature), meaning it requires ≥0.2 V headroom below V− and ≥0.8 V headroom below V+. For true rail-to-rail input, consider TI's OPA377 or similar alternatives - but note that LMP2021MAX/NOPB's strength lies in ultra-low drift and EMI rejection, not input voltage range.
Can LMP2021MAX/NOPB be used in single-supply 3.3 V systems?
Yes, the LMP2021MAX/NOPB is fully specified for 3.3 V single-supply operation. Its supply voltage range is 2.2 V to 5.5 V, and all key parameters - including offset voltage, noise, CMRR, and output swing - are characterized at 2.5 V and 5 V, covering 3.3 V by interpolation and validation. Output swing remains within 135 mV of rails at 3.3 V with 10 kΩ load, supporting direct interfacing with 3.3 V SAR ADCs.
What is the purpose of the N/C pins on LMP2021MAX/NOPB in SOIC package?
The N/C pins (pins 6, 7, and 8) on the LMP2021MAX/NOPB SOIC package are unconnected die bond pads with no internal circuitry. They must remain electrically floating - no PCB traces, vias, or thermal pads should connect to them. TI explicitly states these pins have "No Internal Connection" in the Pin Functions table (Section 5), and routing to them may compromise EMI performance or cause parametric shift due to parasitic capacitance.
How does the EMI rejection ratio (EMIRR) of LMP2021MAX/NOPB improve system design?
The LMP2021MAX/NOPB's EMIRR of 82 dB at 2.4 GHz allows designers to eliminate external RF filtering components (e.g., feedthrough capacitors, ferrite beads) typically required near op-amp inputs in Bluetooth/Wi-Fi-enabled devices. This reduces BOM count, PCB area, and layout complexity while guaranteeing stable DC offset in RF-dense environments - validated per AN-1698 test methodology and directly applicable to portable medical and industrial IoT endpoints.
LMP2021MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMP®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LMP2021MAX/NOPB FAQ
1.How can I place an order for LMP2021MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP2021MAX/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 LMP2021MAX/NOPB reliable?
The price and inventory of LMP2021MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP2021MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP2021MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP2021MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP2021MAX/NOPB?
LMP2021MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP2021MAX/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 LMP2021MAX/NOPB?
For technical support, including LMP2021MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP2021MAX/NOPB requirements.
6.How does Aetrix verify that LMP2021MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP2021MAX/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 LMP2021MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP2021MAX/NOPB?
All LMP2021MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP2021MAX/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 LMP2021MAX/NOPB part is unused and in its original packaging.
Return procedure for LMP2021MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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