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Texas Instruments OPA241UA/2K5
- Part No.:
- OPA241UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA241UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:394
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Product details
Overview
OPA241UA/2K5 from Texas Instruments is a single-channel, micro-power operational amplifier optimized for 5V single-supply operation, featuring 25μA quiescent current, ±250μV max input offset voltage, rail-to-rail output swing within 50mV of rails, and 124dB common-mode rejection. It serves as a precision signal-conditioning front-end in battery-powered medical sensors and portable instrumentation.
For engineers reviewing the OPA241UA/2K5 datasheet, OPA241UA/2K5 pinout, OPA241UA/2K5 application, or OPA241UA/2K5 equivalent, key selection criteria include ultra-low IQ for multi-year battery life, guaranteed rail-to-rail output at 2.7V–36V supply, laser-trimmed offset stability across −40°C to +85°C, and SOIC-8 packaging with external trim pins for critical DC accuracy.
Technical Context
The OPA241UA/2K5 implements a CMOS input stage with differential pair topology, enabling nanoscale input bias current (−4nA typ) and high input impedance (1GΩ || 4pF common-mode). Its unity-gain stable architecture supports direct connection to capacitive loads up to 200pF at 5V supply without external compensation.
Designed specifically for low-voltage precision amplification, it maintains 120dB open-loop gain and 35kHz gain-bandwidth product across 2.7V–5V operation, while its input common-mode range extends 200mV below V−-a critical capability for single-supply sensor interfacing where ground-referenced signals must be amplified without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 36V single supply (or ±1.35V to ±18V dual); enables direct integration into 3.3V/5V systems and legacy ±15V test equipment. |
| Quiescent Current | ±25μA per amplifier; allows continuous operation for >10 years on a single CR2032 coin cell in sleep-mode sensor nodes. |
| Input Offset Voltage | ±250μV max (−40°C to +85°C); eliminates need for manual trimming in most portable medical applications like ECG front-ends. |
| Rail-to-Rail Output | Swings within 50mV of supply rails at AOL > 70dB; preserves full dynamic range when driving ADCs with 0–VS input ranges. |
| Common-Mode Rejection | 124dB (typ at ±15V); rejects power supply ripple and shared-noise coupling in battery-powered multichannel data loggers. |
| Gain-Bandwidth Product | 35kHz at VS = 5V; sufficient for DC–10kHz biosignal amplification (e.g., pulse oximetry, EMG) with stable unity-gain configuration. |
| Input Voltage Noise | 1.7μVPP (0.1Hz–10Hz); supports low-frequency precision measurement in weigh scales and thermopile amplifiers. |
Pinout & Package
OPA241UA/2K5 is packaged in an 8-pin SOIC (D package), 3.9mm × 4.9mm body, 1.27mm pitch, with exposed pad not present. Pin 1 and Pin 5 provide external offset trim capability; Pin 8 is no-connect and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (1GΩ || 4pF) for reference or sensor signal injection; accepts common-mode voltages down to (V−) − 0.2V. |
| −IN (Pin 2) | Inverting input | Differential input node; matched to +IN for <1μV/°C drift and minimal input offset voltage shift over temperature. |
| OUT (Pin 6) | Amplifier output | Capable of sourcing 4mA/sinking 24mA; drives 10kΩ loads while maintaining rail-to-rail swing within 100mV at −40°C to +85°C. |
| V+ (Pin 7) | Positive supply | Highest potential rail; must be bypassed with 0.01μF ceramic capacitor placed ≤2mm from pin to ensure stability with capacitive loads. |
| V− (Pin 4) | Negative supply | Lowest potential rail (often GND in single-supply); input common-mode extends 200mV below this pin for true single-supply operation. |
| TRIM (Pins 1 & 5) | Offset adjustment terminals | Enable external nulling via 10kΩ potentiometer; only available on single-channel variants (OPA241/OPA251), not dual/quad versions. |
| NC (Pin 8) | No internal connection | Unbonded die pad; electrically isolated and may be left floating or tied to GND for mechanical stability-no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at 5V | Ensures ±250μV max VOS under actual operating conditions used in portable devices-not just at ±15V test points. |
| Rail-to-rail output stage | Delivers full-scale signal swing into 100kΩ loads at 2.7V supply, maximizing SNR when interfacing with 12-bit+ SAR ADCs. |
| Unity-gain stable design | Operates reliably without external compensation in buffer, follower, or gain-of-1 configurations-even with 200pF load at 5V. |
| Extended temperature range | Specified from −40°C to +85°C (operational to +125°C), supporting deployment in automotive cabin sensors and industrial handheld testers. |
| Low input bias current | −4nA typical (flows out of inputs), minimizing voltage error across high-impedance pH electrodes or piezoelectric transducers. |
Applications
| Battery-Powered ECG Monitor | Portable Gas Sensor Signal Chain |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry-electrode chest leads in a handheld cardiac screening device powered by two AA cells. IC Role / Device Role / Timing Role: Primary DC-coupled instrumentation amplifier stage with gain = 100, rejecting electrode half-cell potential drift and 50/60Hz mains interference. Use Value: 25μA IQ extends battery life beyond 18 months; rail-to-rail output ensures full utilization of 3.3V ADC input range without level-shifting circuitry. |
Use Scenario: Conditioning low-current output (100nA–2μA) from electrochemical CO sensors in a personal air quality badge with Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 10MΩ feedback resistor, converting sensor current to voltage while rejecting common-mode noise from shared power rails. Use Value: 1GΩ input impedance minimizes loading error; ±250μV offset avoids baseline calibration drift during 7-day field deployments. |
| Low-Power Weigh Scale Load Cell Interface | Industrial Handheld Multimeter Front-End |
|
Use Scenario: Amplifying mV-level bridge outputs from strain gauges in a rechargeable lithium-ion powered pocket scale with auto-zero function. IC Role / Device Role / Timing Role: Precision difference amplifier with external trim pins (Pins 1 & 5) used to null system-level offset introduced by PCB trace resistance and solder joint thermocouples. Use Value: Laser-trimmed initial offset reduces post-calibration drift; 1.7μVPP 0.1–10Hz noise enables 20,000-count resolution at 10Hz update rate. |
Use Scenario: High-impedance buffer for 10MΩ input resistance mode in a Class II handheld DMM operating from a 9V alkaline battery. IC Role / Device Role / Timing Role: Guard driver and input buffer isolating high-Z analog input path from digital switching noise generated by internal MCU and display drivers. Use Value: 124dB CMRR suppresses crosstalk from 3.3V digital domain; 2.7V minimum supply allows operation until battery drops to 5.4V (two cells in series). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture (0.02μV/°C drift), 17μA IQ, but only rated to 5.5V max supply and lacks external trim pins. | Better for ultra-stable DC measurements over wide temperature swings; unsuitable for 12V/24V industrial sensors or battery systems above 5.5V. | Select OPA2333AIDR only when sub-μV/°C drift dominates over supply flexibility and trim capability. |
| LMV321IDBVR | Higher IQ (80μA), ±3mV offset, no trim pins, but wider GBW (1MHz) and lower cost; SOIC-5 package (no V− pin-single-supply only). | Acceptable for non-critical consumer-grade sensors where 12-bit accuracy suffices and battery life >6 months is acceptable. | Choose LMV321IDBVR for cost-sensitive, high-volume portable electronics where precision is secondary to BOM reduction. |
Compared with OPA241UA/2K5, OPA2333AIDR delivers superior long-term DC stability but sacrifices supply voltage headroom and user-adjustable offset correction, while LMV321IDBVR trades precision and power efficiency for bandwidth and unit cost-making OPA241UA/2K5 the optimal balance for battery-constrained, medium-accuracy industrial sensing.
Availability
OPA241UA/2K5 is available at Aetrix Electronics and suitable for battery-operated instruments, portable medical devices, and low-power test equipment requiring stable component supply across extended production lifecycles.
Supply support for OPA241UA/2K5 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 over 50 years of op-amp innovation and broad portfolio coverage from precision to high-speed.
The OPAx241 family was designed explicitly for ultra-low-power, single-supply precision amplification in portable and battery-dependent systems-prioritizing micropower consumption, rail-to-rail output, and robust DC accuracy over speed or drive strength.
FAQ
What is the maximum capacitive load the OPA241UA/2K5 can drive stably in unity-gain configuration at 5V supply?
The OPA241UA/2K5 remains stable with up to 200pF capacitive load in unity-gain configuration at VS = 5V and zero output current. Stability degrades with increasing load capacitance, output current, or decreasing supply voltage-so for loads >200pF, TI recommends adding a 5kΩ series resistor inside the feedback loop as shown in Figure 6-4 of the SBOS075A datasheet. This preserves DC accuracy while extending usable capacitive load drive beyond 1000pF at low supplies.
Does the OPA241UA/2K5 support dual-supply operation, and what are the limits?
Yes, the OPA241UA/2K5 supports dual-supply operation from ±1.35V to ±18V. Its absolute maximum rating allows ±18V, but recommended operating conditions specify ±15V for optimal offset and drift performance. At ±15V, the device achieves ±50μV typical input offset voltage and 124dB CMRR, while maintaining full functionality across the extended −55°C to +125°C junction temperature range. The input common-mode range extends to (V−) − 0.2V, making it suitable for asymmetric dual supplies.
How does the external offset trim function work on the OPA241UA/2K5, and when should it be used?
The OPA241UA/2K5 provides dedicated TRIM pins (1 and 5) for external offset nulling using a 10kΩ potentiometer connected between them, with wiper to V−. This feature is intended only to null the amplifier's intrinsic input offset voltage-not system-level errors from sensors or PCB layout. Because trimming can degrade offset drift performance, TI advises using it only in applications demanding sub-100μV total system offset at temperature extremes, such as laboratory-grade portable calibrators. Most designs operate successfully without trimming due to the laser-trimmed ±250μV max specification.
Is the OPA241UA/2K5 RoHS compliant and lead-free?
Yes, the OPA241UA/2K5 is RoHS compliant and lead-free. Per TI's packaging documentation, the SOIC-8 (D package) variant uses NiPdAu lead finish and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The part marking "U" indicates SOIC-8 packaging, and "A" denotes commercial temperature grade (−40°C to +85°C). Full compliance documentation-including substance declarations and reflow profile data-is available in TI's official Packaging Information addendum for SBOS075A.
What is the input common-mode voltage range of the OPA241UA/2K5 at 3.3V single supply?
At 3.3V single supply (V− = 0V, V+ = 3.3V), the OPA241UA/2K5 input common-mode voltage range is −0.2V to 2.5V-i.e., it extends 200mV below ground and stops 800mV below V+. This allows direct amplification of ground-referenced sensor outputs (e.g., thermistors, bridge circuits) without level-shifting, while ensuring reliable operation even with small negative transients or PCB ground bounce. The range is independent of output loading and remains valid across the full −40°C to +85°C operating temperature range.
OPA241UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.01V/µs
- Gain Bandwidth Product:
- 35 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 27µA
- Current - Output / Channel:
- 21 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA241UA/2K5 FAQ
1.How can I place an order for OPA241UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA241UA/2K5 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 OPA241UA/2K5 reliable?
The price and inventory of OPA241UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA241UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA241UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA241UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA241UA/2K5?
OPA241UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA241UA/2K5 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 OPA241UA/2K5?
For technical support, including OPA241UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA241UA/2K5 requirements.
6.How does Aetrix verify that OPA241UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA241UA/2K5 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 OPA241UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA241UA/2K5?
All OPA241UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA241UA/2K5, 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 OPA241UA/2K5 part is unused and in its original packaging.
Return procedure for OPA241UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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