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Texas Instruments OPA4251PA
- Part No.:
- OPA4251PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA4251PA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,877
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Product details
Overview
OPA4251PA from Texas Instruments is a quad-channel, micro-power operational amplifier optimized for ±15V dual-supply operation, featuring 25μA quiescent current per amplifier, ±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 portable medical instruments and battery-powered test equipment.
For engineers reviewing the OPA4251PA datasheet, OPA4251PA pinout, OPA4251PA application, or OPA4251PA equivalent, this page delivers verified specifications, SOIC-14 package layout, real-world use cases in low-power analog sensing, and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA4251PA belongs to the OPAx251 family, laser-trimmed at ±15V for minimal offset voltage and drift, and operates across ±1.35V to ±18V dual supplies or 2.7V–36V single supply. Its input common-mode range extends 200mV below V–, enabling robust single-supply use without level-shifting.
It is unity-gain stable and drives capacitive loads up to 2700pF at ±15V with gain ≥10, while maintaining 30kHz gain-bandwidth and 0.01V/μs slew rate. Input bias current is –4nA typical, and open-loop gain reaches 128dB at ±15V with 20kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | ±27 μA per amplifier (enables multi-year battery life in portable instrumentation) |
| Input Offset Voltage | ±50 μV typical, ±250 μV max at ±15V (reduces DC error in precision sensor interfaces) |
| CMRR | 124 dB at ±15V (rejects noise in high-impedance electrode or transducer inputs) |
| Rail-to-Rail Output | Swings within 50 mV of rails at AOL > 100 dB (maximizes dynamic range in 3.3V or 5V ADC front-ends) |
| Gain-Bandwidth Product | 30 kHz (supports stable DC-coupled amplification and low-frequency filtering) |
| Supply Range | ±1.35V to ±18V dual or 2.7V–36V single (fits industrial, medical, and legacy ±15V systems) |
| Operating Temperature | –40°C to +85°C (fully specified; functional to –55°C and +125°C) |
Pinout & Package
OPA4251PA is housed in a 14-pin SOIC (D) package with standard JEDEC outline, 1.27mm pitch, and exposed pad not present. Thermal resistance RθJA is 100°C/W, suitable for moderate-power analog sections 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 or differential configuration; matched with +IN A for CMRR |
| 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 | Highest potential rail; must be bypassed with 0.01μF ceramic capacitor near pin |
| V– (Pin 11) | Negative power supply | Lowest potential rail; supports true dual-supply or single-supply ground-referenced operation |
| +IN B (Pin 5), +IN C (Pin 10), +IN D (Pin 12) | Noninverting inputs, Channels B–D | Independent high-Z inputs; no internal trimming or coupling between channels |
| –IN B (Pin 6), –IN C (Pin 9), –IN D (Pin 13) | Inverting inputs, Channels B–D | Matched pairs per channel; channel separation is 0.3 μV/V (excellent crosstalk suppression) |
| OUT B (Pin 7), OUT C (Pin 8), OUT D (Pin 14) | Outputs, Channels B–D | Individually buffered; each capable of sourcing 4mA and sinking 24mA |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset at ±15V | ±50 μV typical initial offset enables <1 LSB error in 16-bit systems without calibration |
| Rail-to-rail output stage | Delivers full-scale swing within 50 mV of V+ or V–, preserving ADC resolution in low-voltage systems |
| Unity-gain stability | Operates stably at G = 1 with no external compensation-critical for buffer and follower applications |
| High CMRR (124 dB) | Rejects interference from shared power rails or noisy digital grounds in mixed-signal PCBs |
| Ultra-low IQ (27 μA) | Permits integration into always-on monitoring nodes powered by coin cells or energy harvesters |
Applications
| Battery-Powered ECG Front-End | Portable pH Meter Signal Chain |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from dry electrodes under variable skin contact impedance. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end providing gain, filtering, and level-shifting before 24-bit sigma-delta ADC. Use Value: 124dB CMRR rejects 50/60Hz mains pickup; rail-to-rail output maximizes dynamic range into 3.3V ADC; 27μA IQ extends battery life beyond 12 months. |
Use Scenario: Conditioning mV-level output from glass pH electrode and reference electrode pair in handheld field meter. IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with ultra-low input bias current (<–4nA) minimizing electrode polarization error. Use Value: ±250μV max offset ensures <0.01pH accuracy without manual zeroing; wide supply range supports both 9V battery and USB 5V operation. |
| Low-Power Industrial Sensor Node | Multi-Channel Data Acquisition Module |
Use Scenario: Simultaneous conditioning of thermocouple, RTD, and strain gauge outputs in wireless condition-monitoring sensor. IC Role / Device Role / Timing Role: Quad op-amp providing cold-junction compensation, excitation current sources, and programmable gain stages. Use Value: Four independent channels reduce board area vs discrete solutions; 27μA/channel enables sub-100μA system sleep current. |
Use Scenario: Analog front-end for 16-channel, 100ksps DAQ system requiring matched DC performance across all channels. IC Role / Device Role / Timing Role: Quad-channel buffer and anti-alias filter driver feeding multiplexed SAR ADC inputs. Use Value: Channel separation of 0.3 μV/V prevents crosstalk-induced measurement errors; ±15V supply compatibility maintains legacy test equipment interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4241PA | Optimized for 5V single supply; higher offset drift (±0.6 μV/°C vs ±0.5 μV/°C); same 25μA IQ and SOIC-14 package | Better suited for 3.3V/5V battery systems where ±15V rails unavailable; less ideal for legacy ±15V test gear | Select OPA4241PA when operating exclusively from 2.7–5.5V and prioritizing lowest drift at low voltage |
| TLV2474IPW | Higher IQ (600μA vs 27μA); lower CMRR (90dB); rail-to-rail I/O; 2.8MHz GBW; same SOIC-14 footprint | Applicable where speed matters more than power; unsuitable for multi-year battery life or high-noise environments | Choose TLV2474IPW only if bandwidth >1MHz required and system can tolerate 22× higher supply current |
Compared with OPA4251PA, OPA4241PA trades ±15V optimization for better low-voltage offset stability, while TLV2474IPW sacrifices micropower operation for bandwidth-making OPA4251PA uniquely balanced for precision, low-noise, ±15V-compatible instrumentation.
Availability
OPA4251PA is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable test equipment, and industrial sensor nodes requiring stable component supply over extended production lifecycles.
Supply support for OPA4251PA 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 heritage in precision op-amps and signal-chain innovation.
The OPAx251 series-including OPA4251PA-is designed for high-accuracy, low-power analog signal conditioning in portable and battery-operated instrumentation where offset, drift, and supply flexibility are critical.
FAQ
What supply voltages does the OPA4251PA support?
The OPA4251PA operates from ±1.35V to ±18V dual supply or 2.7V to 36V single supply. It is laser-trimmed for optimal performance at ±15V, delivering ±50μV typical offset and ±0.5μV/°C drift. At lower voltages like ±5V, offset increases slightly but remains within ±250μV max across –40°C to +85°C. The OPA4251PA maintains rail-to-rail output swing and 124dB CMRR across its full range.
Does the OPA4251PA include offset trim pins?
No, the OPA4251PA does not include offset trim pins. Trim capability is provided only on the single-channel variants OPA241 and OPA251 (pins 1 and 5). As a quad-channel device, OPA4251PA relies on factory laser trimming for its ±250μV max input offset voltage. External trimming is not supported, and no dedicated trim terminals exist on the SOIC-14 package.
Can the OPA4251PA drive capacitive loads reliably?
Yes-the OPA4251PA is unity-gain stable and can drive up to 2700pF at ±15V with gain ≥10. At ±15V, G = 1, it remains stable with ~200pF. For larger loads in unity-gain configurations, TI recommends adding a 5kΩ series resistor inside the feedback loop (Figure 6-4), which improves stability beyond 1000pF while retaining DC accuracy. This technique is validated in the official SBOS075A datasheet.
What is the thermal performance of the OPA4251PA in SOIC-14 package?
The OPA4251PA in SOIC-14 (D package) has a junction-to-ambient thermal resistance (RθJA) of 100°C/W. With 27μA per amplifier × 4 channels = 108μA total quiescent current, self-heating is negligible (<0.01°C rise) under normal conditions. No heatsinking is required. The device is fully specified from –40°C to +85°C and functional from –55°C to +125°C, making it suitable for uncontrolled industrial environments.
How does the OPA4251PA compare to the OPA4241PA in practical design?
The OPA4251PA is optimized for ±15V operation (±50μV typical offset, ±0.5μV/°C drift), while the OPA4241PA is trimmed for 5V (±100μV typical, ±0.6μV/°C). Both share identical SOIC-14 packaging, 25μA IQ, rail-to-rail output, and 30–35kHz GBW. Choose OPA4251PA for legacy test equipment or systems with ±15V rails; choose OPA4241PA for modern 3.3V/5V battery designs where low-voltage offset stability is paramount.
OPA4251PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA4251PA FAQ
1.How can I place an order for OPA4251PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4251PA 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 OPA4251PA reliable?
The price and inventory of OPA4251PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4251PA is usually 5 days.
3.What payment methods are accepted for OPA4251PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4251PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4251PA?
OPA4251PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4251PA 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 OPA4251PA?
For technical support, including OPA4251PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4251PA requirements.
6.How does Aetrix verify that OPA4251PA is sourced from the original manufacturer or authorized distributors?
All OPA4251PA 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 OPA4251PA meets industry standards.
7.What is the process for return or replacement of OPA4251PA?
All OPA4251PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4251PA, 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 OPA4251PA part is unused and in its original packaging.
Return procedure for OPA4251PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4251PA Tags
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