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Texas Instruments OPA241PA
- Part No.:
- OPA241PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA241PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:251
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Product details
Overview
OPA241PA 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 - deployed in portable medical instrumentation and battery-powered sensor signal conditioning.
For engineers reviewing the OPA241PA datasheet, OPA241PA pinout, OPA241PA application, or OPA241PA equivalent, this page delivers verified specifications, SOIC-8 package layout, real-world use cases in low-voltage precision analog front-ends, and validated alternative op-amps with documented parameter trade-offs.
Technical Context
The OPA241PA uses laser-trimmed input stage architecture to achieve ±250μV max offset at 5V supply, with input common-mode range extending 200mV below V– - enabling true single-supply operation down to 2.7V. Its unity-gain stable design supports capacitive loads up to 200pF at VS = 5V without external compensation.
It delivers 128dB open-loop gain and 35kHz gain-bandwidth product while maintaining rail-to-rail output swing (50mV from rail at AOL > 70dB) across –40°C to +85°C. Input bias current is –20nA (typ), and input voltage noise is 1.7μVPP (0.1Hz–10Hz) - critical for high-impedance, low-drift sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 2.7V–36V; dual: ±1.35V–±18V - supports wide-input battery and industrial power rails. |
| Quiescent Current | ±25μA per amplifier - enables multi-year operation on coin-cell batteries. |
| Input Offset Voltage | ±250μV max (TA = –40°C to +85°C) - eliminates need for manual trimming in most precision DC-coupled circuits. |
| CMRR | 124dB - rejects common-mode noise in noisy single-supply environments like portable ECG front-ends. |
| Output Swing | Within 50mV of rails (AOL > 70dB) - maximizes dynamic range in 3.3V or 5V systems. |
| Gain-Bandwidth | 35kHz - sufficient for DC–10kHz sensor amplification with stability margin. |
| Input Noise | 1.7μVPP (0.1Hz–10Hz) - preserves signal integrity in low-frequency biomedical measurements. |
Pinout & Package
OPA241PA is housed in an 8-pin SOIC (D package), 1.27mm pitch, with exposed pad not present. Pin 1 and Pin 5 provide external offset trim capability; Pin 8 is NC (no internal connection) and may be left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (1GΩ || 4pF) accepting sensor or reference signals with minimal loading. |
| –IN (Pin 2) | Inverting input | Accepts feedback network or inverted signal path; matched to +IN for CMRR optimization. |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable (50mV headroom); drives 10kΩ load while maintaining 100dB open-loop gain. |
| V+ (Pin 7) | Positive supply | Highest potential rail; bypass with 0.01μF ceramic capacitor for PSRR preservation. |
| V– (Pin 4) | Negative supply | Lowest potential rail (GND in single-supply); common-mode extends 200mV below this pin. |
| TRIM (Pins 1 & 5) | Offset adjustment | Allows fine-tuning of input offset via external potentiometer - used only when initial ±250μV is insufficient. |
| NC (Pin 8) | No connection | Internally unconnected; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at 5V | Enables guaranteed ±250μV max performance in low-voltage battery systems without calibration. |
| Rail-to-rail output | Delivers full 2.7V–36V usable output swing - critical for maximizing ADC resolution in 3.3V data acquisition. |
| Unity-gain stable | Operates reliably in buffer, follower, and gain-of-one configurations without phase-compensation components. |
| Wide common-mode input range | Accepts inputs 200mV below V– - supports ground-referenced sensors in single-supply topologies. |
| Low 1/f noise | 1.7μVPP (0.1Hz–10Hz) enables stable DC-coupled amplification of thermocouples and strain gauges. |
Applications
| Battery-Powered ECG Monitor | Portable Gas Sensor Signal Chain |
|---|---|
Use Scenario: Amplifying low-amplitude, sub-mV bio-potential signals from dry electrodes under variable battery voltage (3.0V–4.2V). IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier front-end stage with DC-coupled gain and offset rejection. Use Value: 25μA IQ extends device runtime beyond 3 years on CR2032; ±250μV offset avoids baseline drift correction firmware. |
Use Scenario: Conditioning resistive gas sensor (MQ-135) output in handheld air quality meter powered by Li-ion cell. IC Role / Device Role / Timing Role: Low-drift transimpedance amplifier converting sensor current to voltage with rail-to-rail output into 12-bit SAR ADC. Use Value: 124dB CMRR suppresses switching noise from onboard DC/DC converter; 50mV rail headroom preserves full ADC input range. |
| Handheld Multimeter Analog Front-End | Low-Power Industrial Temperature Transmitter |
Use Scenario: Precision DC amplification and level-shifting of thermistor or RTD bridge outputs in autoranging DMM. IC Role / Device Role / Timing Role: Programmable-gain amplifier stage operating from 3.3V supply with auto-zero support via TRIM pins. Use Value: Laser-trimmed offset ensures <0.1% reading error over –10°C to +50°C ambient; SOIC-8 footprint simplifies layout in compact PCBs. |
Use Scenario: 4–20mA loop-powered transmitter sensing Pt100 RTD in remote environmental monitoring node. IC Role / Device Role / Timing Role: Low-power signal conditioner interfacing RTD to sigma-delta ADC, powered from loop current. Use Value: 2.7V minimum supply allows operation down to 3.5V loop drop; 10MΩ differential input impedance prevents RTD self-heating errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA341UA | Higher IQ (100μA), lower offset (±100μV), same SOIC-8 package - but not specified for –55°C to +125°C extended temp. | Better DC precision at cost of 4× higher supply current; unsuitable for ultra-low-power long-life deployments. | Select OPA341UA only when offset budget is tighter than 250μV and battery life >1 year is not required. |
| MCP6001T-I/OT | Lower IQ (9μA), wider supply (1.8V–6.0V), but lower CMRR (90dB) and no TRIM pins - SOT-23-5 package. | Optimized for sub-2V logic-compatible systems; lacks precision trimming and rail-to-rail output drive capability. | Choose MCP6001T-I/OT for cost-sensitive, low-voltage (<2.5V) designs where CMRR >100dB is not mandatory. |
Compared with OPA241PA, OPA341UA trades micro-power operation for enhanced DC accuracy, while MCP6001T-I/OT sacrifices precision and trim flexibility to achieve lower IQ and smaller footprint - making OPA241PA the optimal balance for 5V battery-powered instrumentation requiring guaranteed offset and robust CMRR.
Availability
OPA241PA is available at Aetrix Electronics and suitable for battery-operated instruments, portable medical devices, and test equipment requiring stable component supply with full industrial temperature range support (–40°C to +85°C).
Supply support for OPA241PA 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, with leadership in precision analog ICs since 1930.
The OPAx241 family was designed specifically for ultra-low-power, single-supply precision amplification in portable and battery-constrained systems - emphasizing offset stability, rail-to-rail output, and wide supply flexibility.
FAQ
What is the maximum capacitive load the OPA241PA can drive stably at 5V supply?
The OPA241PA maintains unity-gain stability with up to 200pF capacitive load when operating at VS = 5V, G = 1, and IOUT = 0. Exceeding this requires external compensation - such as a series resistor in the feedback path - to prevent peaking or oscillation. This limit is confirmed in TI's SBOS075A datasheet Figure 6-2 and Section 6.1.3.
Does the OPA241PA support dual-supply operation, and what is its symmetric voltage range?
Yes, the OPA241PA supports dual-supply operation from ±1.35V to ±18V. Its input common-mode range extends 200mV below V–, and output swings within 50mV of both rails - enabling full utilization of ±15V supplies in traditional op-amp configurations. This is explicitly specified in Sections 5.2 and 5.7 of the SBOS075A datasheet.
Can the OPA241PA operate from a 3.3V supply, and how does performance change versus 5V?
Yes, the OPA241PA is fully specified from 2.7V to 36V single supply, including 3.3V. At 3.3V, offset voltage remains ≤±250μV (max), CMRR stays ≥124dB, and output swing is still rail-to-rail within 50mV - though GBW reduces slightly from 35kHz (at 5V) to ~30kHz. These values are validated across temperature in Tables 5.6 and 5.7.
What is the purpose of Pins 1 and 5 (TRIM) on the OPA241PA, and when should they be used?
Pins 1 and 5 on the OPA241PA provide external offset voltage adjustment using a 10kΩ potentiometer wired between them with wiper to V–. They are intended only to null residual amplifier offset - not system-level offsets - and should be used sparingly, as trimming degrades offset drift performance. The datasheet states user adjustment is "usually not required" due to ±250μV max initial offset.
Is the OPA241PA RoHS-compliant and lead-free, and what is its MSL rating?
Yes, the OPA241PA is RoHS-compliant and lead-free, with NIPDAU (nickel-palladium-gold) lead finish. As a SOIC-8 (D package) device, it carries no moisture sensitivity level (MSL) rating - MSL is "N/A for Pkg Type" per TI's Packaging Information Addendum. It is qualified for reflow per JEDEC J-STD-020.
OPA241PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA241PA FAQ
1.How can I place an order for OPA241PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA241PA 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 OPA241PA reliable?
The price and inventory of OPA241PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA241PA is usually 5 days.
3.What payment methods are accepted for OPA241PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA241PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA241PA?
OPA241PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA241PA 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 OPA241PA?
For technical support, including OPA241PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA241PA requirements.
6.How does Aetrix verify that OPA241PA is sourced from the original manufacturer or authorized distributors?
All OPA241PA 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 OPA241PA meets industry standards.
7.What is the process for return or replacement of OPA241PA?
All OPA241PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA241PA, 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 OPA241PA part is unused and in its original packaging.
Return procedure for OPA241PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA241PA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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