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Texas Instruments OPA4251UA/2K5
- Part No.:
- OPA4251UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4251UA/2K5.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,079
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Product details
Overview
OPA4251UA/2K5 from Texas Instruments is a quad-channel, micro-power operational amplifier optimized for ±15V dual-supply operation, delivering 25μA quiescent current per amplifier, ±250μV max input offset voltage, rail-to-rail output swing within 50mV of rails, and 124dB common-mode rejection - used in portable medical instruments and battery-powered test equipment.
For engineers reviewing the OPA4251UA/2K5 datasheet, OPA4251UA/2K5 pinout, OPA4251UA/2K5 application, or OPA4251UA/2K5 equivalent, this page provides verified specifications, SOIC-14 package details, real-world use cases, and validated alternative options for low-power precision signal conditioning.
Technical Context
The OPA4251UA/2K5 belongs to the OPAx251 family, laser-trimmed at ±15V for minimal offset voltage and drift, and operates across ±1.35V to ±18V supplies while maintaining unity-gain stability and driving capacitive loads up to 2700pF at ±15V with G = 10.
It features rail-to-rail output (within 50mV), input common-mode range extending 200mV below V–, high open-loop gain (128dB), and low 1/f noise (1.7μVPP, 0.1Hz–10Hz) - enabling accurate DC-coupled amplification in single-supply sensor interfaces and precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±1.35V to ±18V (dual); supports industrial-grade ±15V systems with full spec compliance |
| Quiescent Current | ±27μA to ±38μA per amplifier (typ/max at 25°C); enables multi-channel operation on coin-cell or Li-ion sources |
| Input Offset Voltage | ±50μV typ / ±250μV max at ±15V; laser-trimmed for high-accuracy DC gain without external trimming |
| CMRR | 124dB min (±15V, 25°C); rejects power supply and ground noise in noisy industrial environments |
| Output Swing | Within 50mV of rails (AOL > 100dB); preserves dynamic range in low-voltage data acquisition |
| Gain-Bandwidth | 30kHz (±15V); sufficient for DC–20kHz sensor signal conditioning with stable unity-gain response |
| Input Noise | 1.7μVPP (0.1Hz–10Hz); critical for low-frequency biomedical and strain-gauge applications |
Pinout & Package
OPA4251UA/2K5 is housed in a 14-pin SOIC (D) package with exposed pad not present; thermal resistance RθJA = 100°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | Accepts high-impedance sensor signals; common-mode range extends to V– – 0.2V |
| –IN A (Pin 2) | Inverting input, Channel A | Used for feedback configuration; matched with +IN A for precision differential gain |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable; drives 10kΩ load with ≤100mV headroom at AOL > 100dB |
| V+ (Pin 4) | Positive power supply | Connects to highest potential rail (e.g., +15V); bypass with 0.01μF ceramic capacitor |
| V– (Pin 11) | Negative power supply | Connects to lowest potential rail (e.g., –15V); same bypassing requirement as V+ |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent channel input; electrically isolated from Channel A per datasheet separation spec |
| –IN B (Pin 6) | Inverting input, Channel B | Enables dual independent instrumentation paths on single IC |
| OUT B (Pin 7) | Output, Channel B | Matches OUT A performance; channel separation < 0.3μV/V ensures crosstalk immunity |
| +IN C (Pin 10) | Noninverting input, Channel C | Third channel input; identical specs to Channels A/B for scalable multi-sensor designs |
| –IN C (Pin 9) | Inverting input, Channel C | Supports simultaneous 3-channel signal conditioning without inter-channel interference |
| OUT C (Pin 8) | Output, Channel C | Validated for continuous 4mA sourcing/sinking per channel under load |
| +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 architecture; all inputs share same CMVR and impedance specs |
| OUT D (Pin 14) | Output, Channel D | Delivers same rail-to-rail swing and noise performance as other channels |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power operation | 25μA per amplifier enables 4-channel sensing on <100μA total supply current |
| Rail-to-rail output | Swings within 50mV of V+ and V–, maximizing usable dynamic range in ±15V systems |
| Laser-trimmed offset | ±50μV typical offset at ±15V eliminates need for manual nulling in most precision applications |
| High CMRR & PSRR | 124dB CMRR and ±30μV/V PSRR maintain accuracy in unregulated or noisy supply environments |
| Unity-gain stable | Drives ≥2700pF at ±15V/G=10 without external compensation - simplifies layout and reduces BOM |
Applications
| Battery-Powered ECG Monitor | Portable pH Meter Front-End |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from dry electrodes with minimal power draw. IC Role / Device Role / Timing Role: Quad-channel DC-coupled instrumentation amplifier core, providing gain, filtering, and level-shifting before ADC sampling. Use Value: 1.7μVPP input noise and ±250μV offset ensure sub-microvolt resolution; 25μA/channel extends battery life beyond 100 hours on AA cells. |
Use Scenario: Conditioning mV-level output from glass pH electrodes in handheld field meters. IC Role / Device Role / Timing Role: Precision buffer and reference amplifier for high-impedance electrode interface and temperature-compensated calibration circuitry. Use Value: Input impedance >1GΩ || 4pF prevents electrode loading; rail-to-rail output drives ADC reference directly without level-shifting components. |
| Industrial Loop-Powered Sensor Transmitter | Low-Power Data Logger Analog Front-End |
Use Scenario: Signal conditioning for 4–20mA loop-powered pressure/temperature transmitters operating from 12–24V supply. IC Role / Device Role / Timing Role: Quad op-amp performing sensor excitation, bridge amplification, cold-junction compensation, and output buffering. Use Value: ±18V absolute max rating allows direct connection to 24V loop; 124dB CMRR rejects common-mode noise from shared ground returns. |
Use Scenario: Multi-sensor acquisition (thermocouple, RTD, humidity) in solar-powered environmental loggers. IC Role / Device Role / Timing Role: Simultaneous low-noise amplification and anti-alias filtering for four independent analog channels. Use Value: 30kHz GBW supports oversampling at 10ksps; 25μA/channel enables >1-year operation on 2000mAh Li-SOCl₂ battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micro-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4241UA/2K5 | Optimized for 5V single supply; higher offset drift (±0.6μV/°C vs ±0.5μV/°C) and lower PSRR at ±15V | Better suited for 3.3V/5V battery systems; less ideal for ±15V industrial signal chains | Select OPA4241UA/2K5 only when primary supply is ≤5V and rail-to-rail input is required |
| TLV2474IDR | Higher quiescent current (600μA/channel); rail-to-rail input/output; 2.8MHz GBW; no laser trim (max VOS = 2.5mV) | Targeted at higher-speed, lower-precision applications where power budget allows >20× higher IQ | Choose TLV2474IDR only if bandwidth >100kHz is needed and offset tolerance >1mV is acceptable |
Compared with OPA4251UA/2K5, OPA4241UA/2K5 trades ±15V optimization for better low-voltage rail-to-rail input performance, while TLV2474IDR sacrifices micro-power operation and precision for speed and input flexibility - making OPA4251UA/2K5 the sole choice for ±15V, sub-250μV-offset, quad-channel micro-power precision.
Availability
OPA4251UA/2K5 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable test equipment, and industrial loop-powered sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4251UA/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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPAx251 series - including OPA4251UA/2K5 - was designed for high-accuracy, low-power signal conditioning in ±15V industrial and portable instrumentation, emphasizing laser-trimmed DC precision and robust capacitive-load drive.
FAQ
What supply voltage range does the OPA4251UA/2K5 support?
The OPA4251UA/2K5 supports dual supplies from ±1.35V to ±18V and single supplies from 2.7V to 36V. It is specifically laser-trimmed for optimal offset and drift performance at ±15V, though full specification compliance applies across the entire range. Operation at ±15V ensures ±50μV typical offset and 124dB CMRR as guaranteed in the datasheet.
Does the OPA4251UA/2K5 include offset voltage trim pins?
No, the OPA4251UA/2K5 does not include offset voltage trim pins. Trim capability is provided only on the single-channel variants (OPA241 and OPA251) via pins 1 and 5. As a quad-channel SOIC-14 device, OPA4251UA/2K5 relies solely on factory laser trimming - delivering ±250μV max offset without user adjustment, which improves long-term stability and simplifies PCB layout.
Can the OPA4251UA/2K5 drive capacitive loads reliably?
Yes, the OPA4251UA/2K5 is unity-gain stable and can drive up to 2700pF at ±15V with G = 10. At ±15V and unity gain, it remains stable with ~200pF; stability improves significantly with higher gain or supply voltage. For demanding loads, a small series resistor (e.g., 5kΩ) in the feedback path maintains DC accuracy while suppressing ringing - validated in TI's SBOS075A datasheet Figure 6-4.
What is the operating temperature range for the OPA4251UA/2K5?
The OPA4251UA/2K5 is fully specified from –40°C to +85°C for electrical performance, and functional operation is guaranteed from –55°C to +125°C. Thermal metrics (RθJA = 100°C/W) confirm suitability for industrial enclosures without active cooling, provided ambient temperature stays within the rated range and PCB copper area meets recommended layout guidelines.
How does the OPA4251UA/2K5 compare to the OPA4241UA/2K5 in terms of key parameters?
The OPA4251UA/2K5 is optimized for ±15V operation (±50μV typical offset, ±0.5μV/°C drift), while the OPA4241UA/2K5 is optimized for 5V (±100μV typical offset, ±0.6μV/°C drift). Both share rail-to-rail output, 25μA IQ, and quad SOIC-14 packaging, but OPA4251UA/2K5 delivers superior PSRR and CMRR at ±15V - making it the preferred choice for industrial ±15V signal chains.
OPA4251UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 20 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- -
- 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
OPA4251UA/2K5 FAQ
1.How can I place an order for OPA4251UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4251UA/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 OPA4251UA/2K5 reliable?
The price and inventory of OPA4251UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4251UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA4251UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4251UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4251UA/2K5?
OPA4251UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4251UA/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 OPA4251UA/2K5?
For technical support, including OPA4251UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4251UA/2K5 requirements.
6.How does Aetrix verify that OPA4251UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA4251UA/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 OPA4251UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA4251UA/2K5?
All OPA4251UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4251UA/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 OPA4251UA/2K5 part is unused and in its original packaging.
Return procedure for OPA4251UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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