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Texas Instruments OPA2241UA
- Part No.:
- OPA2241UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2241UA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,923
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Product details
Overview
OPA2241UA from Texas Instruments is a dual-channel, rail-to-rail output, micro-power operational amplifier optimized for single-supply operation at 2.7V–5V. It delivers 25μA quiescent current per amplifier, ±250μV max input offset voltage, 124dB common-mode rejection, and 128dB open-loop gain-enabling precision signal conditioning in battery-powered medical sensors and portable instrumentation.
For engineers reviewing the OPA2241UA datasheet, OPA2241UA pinout, OPA2241UA application, or OPA2241UA equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The OPA2241UA belongs to the OPAx241 family, laser-trimmed at 5V for low offset voltage (±250μV max) and drift (±0.4μV/°C), and operates across −40°C to +85°C. Its input common-mode range extends 200mV below V−, supporting true single-supply sensing near ground.
It is unity-gain stable and drives capacitive loads up to 200pF at VS = 5V, G = 1; stability improves significantly at higher supply voltages or gains. External offset trim pins (1 and 5) are provided only on single-channel variants-not on the dual OPA2241UA-making it a fixed-precision solution without user-adjustable calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 25 μA per amplifier - enables multi-year battery life in always-on sensor nodes |
| Input Offset Voltage | ±250 μV max - eliminates need for external trimming in most precision DC-coupled circuits |
| Rail-to-Rail Output Swing | Within 50 mV of rails at AOL > 100 dB - preserves dynamic range in 3.3V or 5V systems |
| Common-Mode Rejection | 124 dB - rejects power supply noise and ground bounce in noisy embedded environments |
| Supply Range | Single: 2.7V–36V; Dual: ±1.35V–±18V - supports wide input voltage flexibility without redesign |
| Gain-Bandwidth Product | 35 kHz - suitable for low-frequency sensor amplification, filtering, and buffering (e.g., ECG, pH, thermistor) |
| Input Bias Current | −20 nA (typ) - minimizes error in high-impedance source interfaces like piezoelectric or ion-selective electrodes |
Pinout & Package
OPA2241UA is supplied in an 8-pin SOIC (D package), with thermal resistance RθJA = 150°C/W. Pin functions are validated per TI SBOS075A (Rev. June 2024).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance analog signals; common-mode range extends to V− − 0.2V |
| −IN A (Pin 2) | Inverting input, Channel A | Used for feedback configuration; matched input impedance minimizes CMRR degradation |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail swing (within 50 mV); capable of sourcing 4 mA / sinking 24 mA |
| V− (Pin 4) | Negative power supply | Reference for single-supply operation; supports ground-referenced inputs |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent input path; no crosstalk with Channel A (0.3 μV/V channel separation) |
| −IN B (Pin 6) | Inverting input, Channel B | Enables dual independent amplifiers on one die-reduces board space vs discrete solutions |
| OUT B (Pin 7) | Output, Channel B | Identical performance to OUT A; allows simultaneous dual-signal processing (e.g., differential pair) |
| V+ (Pin 8) | Positive power supply | Supports up to 36V single supply; bypassing with 0.01 μF ceramic capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at 5V | ±250 μV max ensures accuracy without external calibration in low-voltage battery systems |
| Rail-to-rail output stage | Delivers full 3.3V or 5V output swing within 50 mV-maximizing ADC utilization in data acquisition |
| Unity-gain stable architecture | Eliminates need for external compensation in buffer, gain, or filter configurations |
| High open-loop gain (128 dB) | Maintains linearity and accuracy under varying load and temperature conditions |
| Wide common-mode input range | Operates down to V− − 0.2V-ideal for single-supply transducer interfaces referenced to ground |
Applications
| Battery-Powered Medical Sensors | Portable Instrumentation Front-End |
|---|---|
Use Scenario: Amplifying low-level bio-signals (e.g., ECG, EMG) from dry electrodes in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with rail-to-rail output driving 12-bit SAR ADC. Use Value: 25μA per amplifier extends coin-cell battery life beyond 3 years; ±250μV offset avoids baseline drift correction firmware. |
Use Scenario: Signal conditioning for multi-channel environmental sensors (temperature, humidity, gas) in field-deployable data loggers. IC Role / Device Role / Timing Role: Dual-channel buffer and level-shifter converting sensor outputs to 0–3.3V range for MCU ADC input. Use Value: Dual configuration reduces component count by 50% vs single op-amps; 124dB CMRR rejects switching regulator noise in compact enclosures. |
| Low-Power Industrial Transmitter | Wearable Health Monitor Analog Front-End |
Use Scenario: Conditioning 4–20mA loop sensor outputs in battery-operated remote pressure/flow transmitters. IC Role / Device Role / Timing Role: High-input-impedance current-to-voltage converter and output driver for 3.3V microcontroller interface. Use Value: −20nA input bias current prevents significant error across 250Ω shunt resistors; wide 2.7–36V supply accommodates aging battery voltage drop. |
Use Scenario: Amplifying photodiode current from PPG (photoplethysmography) sensors in wrist-worn heart-rate monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail output feeding low-noise ADC in ultra-low-power sleep/wake cycles. Use Value: 1.7μVPP (0.1–10Hz) input noise preserves pulse waveform fidelity; 25μA IQ enables sub-10μA system standby current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, micro-power, rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333PA | Lower offset (±2μV typ), higher IQ (17μA), 350kHz GBW - but not optimized for 5V trimming | Better DC precision in zero-drift-critical applications; less suitable for cost-sensitive 5V battery systems | Select OPA2333PA when sub-10μV offset drift over temperature is mandatory; OPA2241UA preferred for 5V-optimized cost/performance balance |
| MCP6022-I/SN | Higher IQ (100μA), lower CMRR (70dB), same 8-pin SOIC - no trim pins, wider temp range (−40°C to +125°C) | More robust in extended-temperature industrial settings; unsuitable for multi-year battery life targets | Choose MCP6022-I/SN for high-temp reliability where power budget allows; OPA2241UA remains optimal for <30μA, 5V, medical-grade precision |
Compared with OPA2333PA and MCP6022-I/SN, the OPA2241UA uniquely balances 5V-specific laser trimming, 25μA IQ, and 124dB CMRR-making it the most cost-effective dual op-amp for long-life, single-supply, precision analog front-ends in portable medical and test equipment.
Availability
OPA2241UA is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable instrumentation front-ends, and low-power industrial transmitters requiring stable component supply across production lifecycles.
Supply support for OPA2241UA 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 chains.
The OPAx241 family was designed specifically for battery-operated, portable instrumentation-prioritizing micro-power consumption, rail-to-rail output, and low-offset performance at 5V supply without sacrificing AC specs.
FAQ
What is the maximum capacitive load the OPA2241UA can drive stably at 5V supply?
The OPA2241UA drives up to 200pF stably in unity-gain configuration at VS = 5V, per TI SBOS075A Figure 6-2. Stability improves with higher supply voltage or closed-loop gain-e.g., at ±15V and G = 10, it supports ~2700pF. For marginal loads, adding a 5kΩ series resistor in the feedback path (Figure 6-4) extends usable capacitance beyond 1000pF while preserving DC accuracy. The OPA2241UA itself does not include internal compensation for heavy capacitive loads.
Does the OPA2241UA have external offset trim capability?
No, the OPA2241UA does not provide external offset trim pins. Trim connections (Pins 1 and 5) exist only on the single-channel OPA241 and OPA251 variants. The OPA2241UA is a dual-channel device with laser-trimmed offset (±250μV max) at 5V-designed for fixed-precision operation without user adjustment. This simplifies layout and eliminates drift degradation risks associated with external trimming.
What is the operating temperature range qualified for the OPA2241UA?
The OPA2241UA is fully specified over −40°C to +85°C per TI SBOS075A Section 5.2. It also operates across −55°C to +125°C, though electrical characteristics outside the −40°C to +85°C range are not production-tested or guaranteed. For automotive or extended-temperature industrial use, derating and validation at extremes are recommended-TI does not warrant performance beyond the qualified range.
Can the OPA2241UA be used with a single 3.3V supply?
Yes, the OPA2241UA is explicitly designed for single-supply operation from 2.7V to 36V-including 3.3V. Its input common-mode range extends to V− − 0.2V (i.e., −0.2V with V− = 0V), and its rail-to-rail output swings within 50mV of both rails at AOL > 100dB. At 3.3V, it maintains 25μA IQ, 124dB CMRR, and 35kHz GBW-making it ideal for modern low-voltage portable systems.
How does the OPA2241UA compare to the OPA2251 in terms of supply optimization?
The OPA2241UA is laser-trimmed for optimal offset and drift performance at 5V, while the OPA2251 is trimmed for ±15V. Both operate across the full 2.7V–36V (or ±1.35V–±18V) range, but OPA2241UA achieves ±250μV max offset and ±0.4μV/°C drift at 5V-whereas OPA2251 delivers ±50μV typ offset at ±15V. For 3.3V or 5V battery systems, OPA2241UA provides superior DC precision without trade-offs in AC performance.
OPA2241UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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:
- 50 µV
- Current - Supply:
- 25µA (x2 Channels)
- Current - Output / Channel:
- 50 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
OPA2241UA FAQ
1.How can I place an order for OPA2241UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2241UA 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 OPA2241UA reliable?
The price and inventory of OPA2241UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2241UA is usually 5 days.
3.What payment methods are accepted for OPA2241UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2241UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2241UA?
OPA2241UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2241UA 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 OPA2241UA?
For technical support, including OPA2241UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2241UA requirements.
6.How does Aetrix verify that OPA2241UA is sourced from the original manufacturer or authorized distributors?
All OPA2241UA 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 OPA2241UA meets industry standards.
7.What is the process for return or replacement of OPA2241UA?
All OPA2241UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2241UA, 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 OPA2241UA part is unused and in its original packaging.
Return procedure for OPA2241UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2241UA Tags
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