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Texas Instruments OPA241UA
- Part No.:
- OPA241UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA241UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,111
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Product details
Overview
OPA241UA 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 low-voltage battery-powered instrumentation.
For engineers reviewing the OPA241UA datasheet, OPA241UA pinout, OPA241UA application, or OPA241UA equivalent, key selection criteria include its 2.7V–36V supply flexibility, unity-gain stability with capacitive loads up to 200pF at 5V, trim-capable offset adjustment, and guaranteed −40°C to +85°C performance across SOIC-8 packaging.
Technical Context
The OPA241UA implements a laser-trimmed CMOS input stage enabling ultra-low input bias current (−20nA typ), high open-loop gain (120dB min), and wide input common-mode range extending 200mV below V−. Its architecture supports single-supply operation without phase reversal and maintains rail-to-rail output drive into 10kΩ loads.
Designed for precision DC-coupled applications, it delivers stable 35kHz gain-bandwidth product and 0.01V/μs slew rate under 5V supply, with input voltage noise of 1.7μVPP (0.1–10Hz) and 65nV/√Hz at 1kHz-enabling accurate amplification of low-level sensor signals in portable medical and test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 36V single supply; enables direct integration into 3.3V, 5V, or higher battery systems without regulation. |
| Quiescent Current | ±25μA per amplifier; extends battery life in always-on portable instruments and wearable sensors. |
| Input Offset Voltage | ±250μV max (−40°C to +85°C); eliminates need for external trimming in most precision DC applications. |
| Output Swing | Within 50mV of rails (AOL > 70dB); preserves dynamic range in low-voltage ADC interfacing and analog front-ends. |
| Common-Mode Rejection | 124dB; rejects power supply ripple and ground noise in single-supply sensor signal chains. |
| Gain-Bandwidth Product | 35kHz at VS = 5V; supports stable amplification of slow-moving physiological or environmental signals. |
| Input Bias Current | −20nA typ; minimizes voltage error across high-impedance pH, thermopile, or photodiode sources. |
Pinout & Package
OPA241UA is housed in an 8-pin SOIC (D package) with standard dual-in-line pin spacing and surface-mount compatibility. Thermal resistance is 150°C/W junction-to-ambient, supporting operation in compact enclosures without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | Accepts high-impedance sensor signals; common-mode range extends 200mV below V−. |
| −IN (Pin 2) | Inverting input | Configures closed-loop gain via feedback network; supports precision differential or transimpedance topologies. |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable; drives 100kΩ loads with <100mV headroom at full temperature range. |
| V+ (Pin 7) | Positive supply | Connects to main system rail (e.g., 3.3V or 5V); bypass with 0.01μF ceramic capacitor. |
| V− (Pin 4) | Negative supply | Ground reference for single-supply use; supports true zero-input operation down to V−. |
| TRIM (Pins 1 & 5) | Offset voltage adjustment | Enables fine nulling of residual offset using external potentiometer; available only on single-channel variants. |
| NC (Pin 8) | No internal connection | Left unconnected; no electrical function or thermal impact. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset voltage | ±250μV max over −40°C to +85°C ensures consistent DC accuracy without calibration in production systems. |
| Rail-to-rail output stage | Swings within 50mV of V+ and V− at 10kΩ load, maximizing usable signal swing in 3.3V or 5V data acquisition. |
| Unity-gain stable design | Operates stably with capacitive loads up to 200pF at 5V, simplifying layout for sensor interfaces and filter stages. |
| Low input voltage noise | 1.7μVPP (0.1–10Hz) and 65nV/√Hz at 1kHz enables clean amplification of microvolt-level biopotential or strain gauge outputs. |
| Wide common-mode input range | Extends 200mV below V−, allowing direct sensing of signals referenced to ground in single-supply configurations. |
Applications
| Battery-Powered Medical Sensors | Portable Test Equipment |
|---|---|
Use Scenario: Amplifying low-amplitude ECG or pulse oximeter signals in handheld patient monitors. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with rail-to-rail output driving 12-bit SAR ADC inputs. Use Value: 25μA quiescent current extends operating time on coin-cell batteries; ±250μV offset avoids baseline drift requiring software correction. |
Use Scenario: Signal conditioning in handheld multimeters and portable oscilloscope probes. IC Role / Device Role / Timing Role: Low-noise buffer and gain stage for high-impedance voltage measurement paths. Use Value: 124dB CMRR rejects switching regulator noise; 35kHz GBW supports accurate AC RMS measurement up to 10kHz. |
| Industrial Sensor Transmitters | Low-Power Data Loggers |
Use Scenario: Conditioning outputs from RTDs, thermocouples, or pressure bridges in remote field transmitters. IC Role / Device Role / Timing Role: Precision voltage follower and level-shifter interfacing millivolt-level sensors to 3.3V microcontrollers. Use Value: Input bias current of −20nA prevents loading errors on high-resistance sensor elements; wide supply range accommodates 12V loop-powered designs. |
Use Scenario: Analog front-end for environmental sensors (temperature, humidity, gas) in solar-powered loggers. IC Role / Device Role / Timing Role: Ultra-low-power signal amplifier enabling wake-up-and-measure duty cycling. Use Value: 25μA IQ allows >1-year operation on AA batteries; TRIM pins support factory calibration to meet ±0.1% accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333PA | Chopper-stabilized architecture; 0.1μV/°C offset drift vs. OPA241UA's ±0.4μV/°C; 17μA IQ; 350kHz GBW. | Better DC precision for long-term drift-critical applications (e.g., laboratory calibrators); higher bandwidth but increased noise at >10Hz. | Select OPA2333PA when sub-μV offset stability over temperature/time outweighs cost and 1/f noise trade-offs. |
| MCP6001T-I/OT | CMOS rail-to-rail op-amp; 100nA IB; 100kHz GBW; 1μA IQ; no trim pins; specified only to +70°C. | Lower power and cost for non-precision consumer-grade monitoring; lacks trim capability and extended temperature range. | Choose MCP6001T-I/OT for cost-sensitive, low-bandwidth applications where ±2mV offset and industrial temp range are acceptable. |
Compared with OPA241UA, OPA2333PA offers superior DC stability at higher bandwidth and noise, while MCP6001T-I/OT provides lower power and cost at the expense of precision, temperature range, and adjustability-making OPA241UA the balanced choice for industrial-grade portable instrumentation requiring verified −40°C to +85°C performance and user-trimmable offset.
Availability
OPA241UA is available at Aetrix Electronics and suitable for battery-operated instruments, portable medical devices, and industrial sensor transmitters requiring stable component supply with full industrial temperature qualification.
Supply support for OPA241UA 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 op-amps and low-power signal-chain solutions.
The OPAx241 family was designed specifically for battery-powered portable instrumentation, emphasizing micro-power operation, rail-to-rail output, and low-offset performance at 5V supply-targeting medical, test, and industrial sensing applications.
FAQ
What is the maximum capacitive load the OPA241UA can drive stably at 5V supply?
The OPA241UA drives up to 200pF stably in unity-gain configuration at 5V supply and zero output current. Stability degrades with increasing output current or decreasing supply voltage. For larger loads, TI recommends adding a 5kΩ series resistor inside the feedback loop, which extends stable operation beyond 1000pF while maintaining DC accuracy-though with slight reduction in output voltage swing. This behavior is documented in Figure 6-4 of the OPA241UA datasheet.
Does the OPA241UA support dual-supply operation, and what are the limits?
Yes, the OPA241UA supports dual-supply operation from ±1.35V to ±18V. It is fully specified over this range, though offset voltage and drift performance are optimized for ±15V in the OPAx251 family. At ±15V, OPA241UA achieves ±100μV max offset and ±0.6μV/°C drift. The input common-mode range extends 200mV beyond the negative rail, and rail-to-rail output remains functional-making it viable for legacy ±15V test equipment upgrades requiring low power.
How does the TRIM functionality work on the OPA241UA, and when should it be used?
The OPA241UA provides external offset trim via Pins 1 and 5, allowing adjustment of residual input offset voltage using a 10kΩ potentiometer wired as described in Figure 6-1 of the datasheet. Trim is recommended only when system-level accuracy demands exceed the ±250μV max spec-such as in calibrated sensor transmitters. Note that trimming may slightly degrade offset drift performance, so it should be applied post-calibration and not used to compensate for source-related offsets.
What is the operating temperature range qualified for the OPA241UA?
The OPA241UA is fully specified and production-tested from −40°C to +85°C. It operates reliably across −55°C to +125°C, though parameters like offset voltage, CMRR, and open-loop gain are guaranteed only within the −40°C to +85°C range. This makes it suitable for industrial and automotive under-hood environments where extended temperature margin is required, provided critical specs are validated at extremes during design-in.
Can the OPA241UA replace older op-amps like the LM358 in low-power applications?
The OPA241UA can replace LM358 in low-power, precision applications-but not as a drop-in substitute. While both are single-supply capable, the OPA241UA draws 25μA vs. LM358's 1mA, offers ±250μV offset vs. ±2mV, and delivers rail-to-rail output vs. ~1.5V headroom. However, OPA241UA's 35kHz GBW is lower than LM358's 1MHz, limiting AC performance. Use OPA241UA where DC precision and battery life are prioritized over bandwidth.
OPA241UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for OPA241UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA241UA 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 reliable?
The price and inventory of OPA241UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA241UA is usually 5 days.
3.What payment methods are accepted for OPA241UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA241UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA241UA?
OPA241UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA241UA 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?
For technical support, including OPA241UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA241UA requirements.
6.How does Aetrix verify that OPA241UA is sourced from the original manufacturer or authorized distributors?
All OPA241UA 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 meets industry standards.
7.What is the process for return or replacement of OPA241UA?
All OPA241UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA241UA, 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 part is unused and in its original packaging.
Return procedure for OPA241UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA241UA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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