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Texas Instruments OPA4241UA
- Part No.:
- OPA4241UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4241UA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
OPA4241UA from Texas Instruments is a quad, single-supply, micropower operational amplifier optimized for 5V operation, delivering rail-to-rail output swing within 50mV of the rails, ±250μV max input offset voltage, and 124dB common-mode rejection - used in portable medical instrumentation, battery-powered test equipment, and low-power sensor signal conditioning.
For engineers reviewing the OPA4241UA datasheet, OPA4241UA pinout, OPA4241UA application, or OPA4241UA equivalent, key selection criteria include its 25μA quiescent current per amplifier, 35kHz gain-bandwidth product, unity-gain stability, −40°C to +85°C specified operating range, and compatibility with capacitive loads up to 200pF at 5V supply.
Technical Context
The OPA4241UA belongs to the OPAx241 family, laser-trimmed for low offset and drift at 5V supply, with input common-mode range extending 200mV below V− - enabling robust single-supply operation. Its architecture supports unity-gain stability and drives capacitive loads without external compensation under defined conditions.
It features fully differential inputs with 1 GΩ || 4 pF common-mode input impedance and 10 MΩ || 3.75 pF differential input impedance, while maintaining 128dB open-loop gain (AOL > 100 dB) across its full output swing range - critical for precision DC-coupled amplification in low-noise analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2.7V–36V; dual: ±1.35V–±18V - supports wide-input industrial and battery systems without level-shifting. |
| Quiescent Current | ±25 μA per amplifier - enables multi-channel operation in energy-constrained devices like handheld diagnostics. |
| Input Offset Voltage | ±250 μV max (TA = −40°C to +85°C) - eliminates need for user trimming in most precision DC applications. |
| Rail-to-Rail Output | Swings within 50 mV of rails at AOL > 70 dB - maximizes dynamic range in 3.3V/5V ADC interface circuits. |
| Gain-Bandwidth Product | 35 kHz - suitable for low-frequency sensor amplification (e.g., thermocouples, strain gauges) with stable phase margin. |
| Common-Mode Rejection | 124 dB - rejects power supply noise and ground bounce in single-supply mixed-signal PCB layouts. |
| Open-Loop Gain | 128 dB - ensures <0.01% gain error in closed-loop configurations with gains ≤100. |
Pinout & Package
OPA4241UA is packaged in a 14-pin SOIC (D package), with exposed pad not present and standard JEDEC-compliant footprint for automated assembly and thermal management via PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance sensor signals; referenced to V− for single-supply biasing. |
| −IN A (Pin 2) | Inverting input, Channel A | Used in transimpedance or difference amplifier configurations; matched input capacitance minimizes CMRR degradation. |
| OUT A (Pin 1) | Output, Channel A | Drives 10kΩ load with <100mV rail margin; stable into 200pF at 5V supply. |
| V+ (Pin 4) | Positive power supply | Connects to main system rail (e.g., 5V or 3.3V); requires local 0.01μF ceramic bypass. |
| V− (Pin 11) | Negative power supply | Ground reference in single-supply mode; common return for all four channels. |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent channel for multi-sensor acquisition; identical specs to Channel A. |
| −IN B (Pin 6) | Inverting input, Channel B | Enables simultaneous differential measurements across two independent signal paths. |
| OUT B (Pin 7) | Output, Channel B | Provides second buffered output without cross-talk; channel separation >100dB at DC. |
| +IN C (Pin 10) | Noninverting input, Channel C | Third channel input; supports 3-axis sensor conditioning or redundant signal paths. |
| −IN C (Pin 9) | Inverting input, Channel C | Matches input structure of other channels for consistent AC/DC performance. |
| OUT C (Pin 8) | Output, Channel C | Third output with same rail-to-rail swing and drive capability as Channels A/B. |
| +IN D (Pin 12) | Noninverting input, Channel D | Fourth independent input; enables full quad-channel analog front-end integration. |
| −IN D (Pin 13) | Inverting input, Channel D | Completes quad-channel symmetry; no shared internal nodes between channels. |
| OUT D (Pin 14) | Output, Channel D | Final output with guaranteed 4mA source/sink capability and <200mV rail margin at 85°C. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset voltage | ±250μV max over −40°C to +85°C - reduces calibration overhead in production test for portable medical devices. |
| Rail-to-rail output stage | 50mV swing margin at AOL > 70dB - preserves full-scale resolution when interfacing with 12-bit+ SAR ADCs. |
| Unity-gain stable architecture | No external compensation required - simplifies layout and reduces BOM count in space-constrained designs. |
| Low input bias current | −4 nA typical (flows out of inputs) - prevents signal loss in high-impedance pH or ion-selective electrode circuits. |
| High CMRR and PSRR | 124dB CMRR, ±30μV/V PSRR - maintains accuracy in noisy environments such as motor-driven portable analyzers. |
| Capacitive load drive | Stable with ≥200pF at 5V, G=1 - supports direct connection to long traces or EMI-filtered inputs without isolation resistors. |
Applications
| Portable Medical Sensors | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Amplifying low-level biopotential signals (ECG, EMG) from dry electrodes in handheld diagnostic tools. IC Role / Device Role / Timing Role: Quad-channel DC-coupled instrumentation amplifier front-end, providing gain, filtering, and rail-to-rail buffering before ADC sampling. Use Value: 25μA per amplifier enables >100 hours of continuous operation on a single CR2032 cell while maintaining <1μVpp input-referred noise. |
Use Scenario: Signal conditioning in handheld multimeters and portable oscilloscope probes. IC Role / Device Role / Timing Role: Precision buffer and level-shifter for attenuated input signals, ensuring accurate scaling across multiple ranges. Use Value: ±250μV offset and 124dB CMRR eliminate manual zeroing and reject mains-borne interference during field measurements. |
| Low-Power Industrial Sensors | Wearable Health Monitors |
Use Scenario: Conditioning outputs from MEMS accelerometers and temperature sensors in wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Quad-channel analog front-end for multi-parameter sensing, with independent gain stages per sensor type. Use Value: Single 3.3V supply operation and rail-to-rail output maximize SNR when digitizing with 16-bit delta-sigma ADCs. |
Use Scenario: Front-end amplification for photoplethysmography (PPG) and galvanic skin response (GSR) in fitness trackers. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance and difference amplifier for optical and bioimpedance measurement. Use Value: 1.7μVPP 0.1Hz–10Hz noise and 0.4μV/°C drift ensure stable baseline tracking during extended wear periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2444IPWR | Higher IQ (110μA/channel), wider GBW (220kHz), but higher offset (±1.5mV) and no laser trim. | Better for higher-speed sensor interfaces; less suitable for ultra-low-offset DC applications. | Select TLV2444IPWR only if bandwidth >100kHz is required and offset tolerance >1mV is acceptable. |
| OPA4340UA | Lower IQ (750μA/channel), rail-to-rail I/O, higher GBW (5.5MHz), but operates down to 2.7V only - not optimized for 5V trimming. | Preferred for higher-precision, higher-speed applications where power budget allows >3× current draw. | Choose OPA4340UA when driving SAR ADCs at >1MSPS or requiring sub-100μV offset with external trimming. |
Compared with TLV2444IPWR and OPA4340UA, the OPA4241UA uniquely balances ultra-low quiescent current (25μA), laser-trimmed low offset (±250μV), and 5V-optimized performance - making it the optimal choice for battery life–critical, precision DC signal chains where speed is secondary.
Availability
OPA4241UA is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered test equipment, and low-power industrial sensor nodes requiring stable component supply across extended production lifecycles.
Supply support for OPA4241UA 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and personal electronics reach.
The OPAx241 series was designed specifically for battery-operated, portable instrumentation - prioritizing micropower consumption, rail-to-rail output, and low-offset precision at 5V supply without sacrificing stability or temperature performance.
FAQ
What is the maximum capacitive load the OPA4241UA can drive stably at 5V supply?
The OPA4241UA is stable driving up to 200pF capacitive load in unity-gain configuration at VS = 5V, as confirmed in TI's SBOS075A datasheet Figure 6-2. Exceeding this value may cause peaking or oscillation unless compensated with a series resistor (e.g., 5kΩ) in the feedback path - a technique validated in Section 6.1.3 of the same document. This limit applies specifically to the OPA4241UA under recommended operating conditions.
Does the OPA4241UA support dual-supply operation, and what are the limits?
Yes, the OPA4241UA supports dual-supply operation from ±1.35V to ±18V, as specified in Section 5.2 of the SBOS075A datasheet. It maintains full functionality including rail-to-rail output swing and 124dB CMRR across this range. However, offset voltage and drift are laser-trimmed for optimal performance at ±15V only in the OPAx251 family - the OPA4241UA is trimmed for 5V, so offset may increase slightly at higher dual supplies.
Is the OPA4241UA pin-compatible with other quad op-amps like the LM324 or TLV2444?
No, the OPA4241UA is not pin-compatible with LM324 or TLV2444. Its 14-pin SOIC pinout (per Figure 4-3 and Table 4-3 in SBOS075A) assigns dedicated noninverting/inverting inputs and outputs per channel with V+ on Pin 4 and V− on Pin 11 - differing from LM324's V− on Pin 4 and TLV2444's V− on Pin 12. Direct replacement requires PCB redesign and layout verification.
What is the input common-mode voltage range for the OPA4241UA in single-supply operation?
In single-supply operation, the OPA4241UA's input common-mode voltage range extends from (V−) − 0.2V to (V+) − 0.8V, as specified in Section 5.6. This means with V− = 0V and V+ = 5V, valid input voltages span −0.2V to +4.2V - enabling robust operation even when signals slightly undershoot ground, a key advantage in single-supply sensor interfaces.
Does the OPA4241UA include offset voltage trim pins, and if so, how are they implemented?
No, the OPA4241UA does not include offset voltage trim pins. Trim capability is provided only on single-channel variants (OPA241 and OPA251) via Pins 1 and 5, as documented in Section 4 and Section 6.1.2 of SBOS075A. The quad OPA4241UA omits these connections to maintain compact 14-pin SOIC packaging and simplify layout for multi-channel applications where laser-trimmed initial offset suffices.
OPA4241UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-SOIC
OPA4241UA FAQ
1.How can I place an order for OPA4241UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4241UA 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 OPA4241UA reliable?
The price and inventory of OPA4241UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4241UA is usually 5 days.
3.What payment methods are accepted for OPA4241UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4241UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4241UA?
OPA4241UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4241UA 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 OPA4241UA?
For technical support, including OPA4241UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4241UA requirements.
6.How does Aetrix verify that OPA4241UA is sourced from the original manufacturer or authorized distributors?
All OPA4241UA 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 OPA4241UA meets industry standards.
7.What is the process for return or replacement of OPA4241UA?
All OPA4241UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4241UA, 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 OPA4241UA part is unused and in its original packaging.
Return procedure for OPA4241UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4241UA Tags
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