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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsOPA2251PA
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OPA2251PA - Burr Brown

Manufacturer Part Number
OPA2251PA
Manufacturer
Burr Brown
Allelco Part Number
32D-OPA2251PA
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,673 pcs available, New & Original
Parts Description
OPA2251 DUAL, 15V SINGLE-SUPPLY,
Package
8-PDIP
Data sheet
-
RoHs Status
 
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In stock: 12673

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Specifications

OPA2251PA Tech Specifications
Burr Brown - OPA2251PA technical specifications, attributes, parameters and parts with similar specifications to Burr Brown - OPA2251PA

Product Attribute Attribute Value
Manufacturer Burr Brown
Voltage - Supply Span (Min) 2.7 V
Voltage - Supply Span (Max) 36 V
Voltage - Input Offset 100 µV
Supplier Device Package 8-PDIP
Slew Rate 0.01V/µs
Series microPOWER™
Package / Case 8-DIP (0.300", 7.62mm)
Package Bulk
Product Attribute Attribute Value
Output Type Rail-to-Rail
Operating Temperature -40°C ~ 85°C
Number of Circuits 2
Mounting Type Through Hole
Gain Bandwidth Product 35 kHz
Current - Supply 27µA (x2 Channels)
Current - Output / Channel 50 mA
Current - Input Bias 20 nA
Amplifier Type General Purpose

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99

Parts Introduction

Manufacturer Part Number

OPA2251PA

Manufacturer

Burr Brown

Introduction

The OPA2251PA is a dual operational amplifier (op-amp) designed for low-power instrumentation and buffer amplifier applications.

Product Features and Performance

Dual operational amplifier in a single package

Rail-to-rail output

Low power consumption

Wide supply voltage range: 2.7V to 36V

Low input offset voltage: 100μV

Low input bias current: 20nA

High gain bandwidth product: 35kHz

Slew rate of 0.01V/μs

Wide operating temperature range: -40°C to 85°C

Product Advantages

Ideal for low-power instrumentation and buffer amplifier applications

Excellent performance in a small 8-pin DIP package

Versatile and can be used in a variety of circuits

Key Technical Parameters

Number of Circuits: 2

Gain Bandwidth Product: 35kHz

Voltage Supply Span (Min/Max): 2.7V to 36V

Current Supply: 27μA per channel

Slew Rate: 0.01V/μs

Voltage Input Offset: 100μV

Amplifier Type: General Purpose

Current Output / Channel: 50mA

Current Input Bias: 20nA

Quality and Safety Features

Burr Brown's reputation for high-quality, reliable components

Wide operating temperature range ensures performance in diverse environments

Compatibility

Through-hole 8-pin DIP package for easy integration into existing designs

Application Areas

Instrumentation amplifiers

Buffer amplifiers

General-purpose amplification circuits

Product Lifecycle

The OPA2251PA is a mature and well-established product in Burr Brown's portfolio.

Replacement or upgrade options may be available, but the OPA2251PA remains a reliable and widely used solution.

Key Reasons to Choose This Product

Excellent performance characteristics for low-power instrumentation and buffer amplifier applications

Versatile and can be used in a variety of circuits

Small 8-pin DIP package for easy integration

Burr Brown's reputation for high-quality, reliable components

Wide operating temperature range for use in diverse environments

Frequently Asked Questions(FAQ)

How does the OPA2251PA compare to other general-purpose amplifiers in terms of power consumption and input bias current, and what are the implications for battery-powered applications?
The OPA2251PA draws only 27 µA per channel, which is notably low compared to typical general-purpose op-amps that often consume over 100 µA. Its input bias current is 20 nA, significantly lower than many alternatives in the same class. This combination makes it particularly suitable for low-power, battery-operated systems where both quiescent current and leakage current directly impact runtime. For example, in a 3V coin-cell application with two channels active, total supply current remains below 60 µA, extending battery life by weeks or even months compared to higher-current designs.
What are the thermal and electrical limitations when driving capacitive loads with the OPA2251PA, and how might stability be affected at high frequencies?
While the OPA2251PA can deliver up to 50 mA output current per channel, driving large capacitive loads without isolation resistors can lead to instability due to its limited slew rate of 0.01 V/µs. At 35 kHz bandwidth, phase margin degradation becomes noticeable beyond 10–20 nF of load capacitance unless compensated. In practice, adding a series resistance (e.g., 10–100 Ω) between output and capacitor improves phase margin but reduces efficiency. Designers should simulate open-loop response or use feedback compensation networks to maintain stability, especially in unity-gain configurations.
Can the OPA2251PA reliably operate from single-supply voltages as low as 2.7 V while maintaining rail-to-rail performance, and what headroom considerations apply?
Yes, the OPA2251PA supports single-supply operation from 2.7 V to 36 V and features rail-to-rail input and output stages. However, output swing drops near the rails—typically within 10–20 mV of each supply—especially at higher temperatures or under heavy loading. With a 2.7 V supply, usable output range may effectively be limited to ~0.03 V to 2.67 V. Input common-mode range includes ground on the negative rail, enabling true single-supply sensing down to 2.7 V, which is ideal for precision signal conditioning in sensor front-ends.
How does the gain-bandwidth product of 35 kHz constrain closed-loop performance, and what trade-offs exist between gain and bandwidth in practical amplifier stages?
The 35 kHz gain-bandwidth product means that at a closed-loop gain of 10, the usable bandwidth is approximately 3.5 kHz. This limits high-frequency signal amplification unless compensated. For example, an inverting stage requiring 100 kHz bandwidth would need a maximum gain of 0.35, which is impractical. Designers must balance gain requirements with available bandwidth—often opting for multiple-stage amplification or alternative architectures like transimpedance if wider bandwidth is needed.
What input offset voltage specifications should influence precision circuit design using the OPA2251PA, and how does temperature affect accuracy?
The OPA2251PA has a specified input offset voltage of ±100 µV typical, which is adequate for many moderate-precision applications but insufficient for high-accuracy analog measurement systems. Over temperature, offset drift can reach several µV/°C; combined with initial mismatch, this may introduce errors greater than 1 mV over a −40°C to +85°C range. For DC-coupled sensors with gains above 100, external trimming or calibration is recommended to compensate for cumulative offset effects.
Is the OPA2251PA suitable for industrial environments, and how do its operating temperature range and package integrity support long-term reliability?
The OPA2251PA is rated for operation from −40°C to +85°C, aligning with standard industrial temperature grades. Its 8-PDIP package offers good mechanical robustness and compatibility with through-hole assembly processes used in prototyping and ruggedized systems. While not hermetically sealed, the plastic encapsulation provides sufficient environmental protection for most non-harsh-industrial applications. Thermal cycling tests typically confirm stable performance across the full range, making it viable for control panels, instrumentation, and embedded systems in ambient-condition environments.
How does the dual-channel configuration of the OPA2251PA benefit system design, and what layout considerations minimize crosstalk between channels?
The integrated dual amplifier reduces board space and simplifies synchronization in applications like differential signal processing, balanced audio, or dual-sensor interfaces. However, due to shared substrate coupling, crosstalk can occur if traces or power paths are poorly routed. Best practices include separating analog ground returns, placing decoupling capacitors close to each supply pin pair, and avoiding adjacent routing of high-impedance nodes. Layout symmetry and guard rings further help maintain isolation, though absolute rejection is not guaranteed given the monolithic construction.
What happens to output drive capability when powered from very low voltages such as 3 V, and how does rail-to-rail output interact with current-limited supplies?
At 3 V supply, the OPA2251PA maintains full functionality including 50 mA output capability, but internal circuitry consumes fixed overhead current (~13 µA per channel), leaving less margin for dynamic swings. Additionally, some op-amps exhibit reduced short-circuit current or thermal roll-off at low voltages due to diminished headroom for internal biasing. Nevertheless, the device remains functional for moderate loads; however, continuous delivery of 50 mA at 3 V may stress power delivery networks and require careful PCB trace sizing to avoid voltage droop.
How does the microPOWER™ branding of the OPA2251PA translate into real-world power savings in microcontroller-based monitoring circuits?
Labeled as part of the microPOWER™ series, the OPA2251PA targets ultra-low-power applications by minimizing static consumption. In a typical ADC driver circuit drawing one channel continuously, total supply current is under 30 µA. Compared to a standard op-amp drawing 1–2 mA, this yields a 30x reduction in power. Over a year of intermittent operation (1% duty cycle), energy saved could exceed hundreds of millijoules per channel, making the OPA2251PA advantageous in remote telemetry or energy-harvesting systems.
Can the OPA2251PA be used in audio applications, and what limitations arise from its slew rate and bandwidth?
Although capable of driving 50 mA, the OPA2251PA’s 35 kHz bandwidth and 0.01 V/µs slew rate severely limit suitability for audio signals. Even modest music content exceeds 20 kHz, and transient peaks require higher slew rates to avoid distortion. The slow response also causes phase lag and amplitude loss above 10 kHz, resulting in poor sound quality. Thus, while technically possible in sub-audio instrumentation, it is generally inappropriate for consumer or professional audio amplification.
What are the consequences of exceeding the recommended supply voltage margin when using the OPA2251PA in automotive or industrial control loops?
Operating near the 36 V maximum rating risks dielectric breakdown in internal ESD protection structures or junction leakage under sustained high-voltage transients. Although the device tolerates brief overvoltages, repeated exposure above 34 V compromises long-term reliability. In 24 V industrial systems with inductive kickback, additional clamping diodes or transient suppressors are advisable. Maintaining a 2–3 V margin ensures safe operation and aligns with standard derating practices for extended service life.
How does the through-hole PDIP packaging affect thermal management and soldering profiles compared to surface-mount variants?
The 8-PDIP package facilitates easy hand-soldering and prototyping but offers inferior thermal conductivity than SOIC or QFN types. Power dissipation above 50 mW may require heat sinking or airflow, though typical amplifier loads rarely generate significant heat. Reflow soldering is not recommended; wave soldering parameters must respect peak temperatures below 260°C to prevent delamination. Through-hole mounting also introduces larger parasitic inductance, slightly affecting high-frequency performance.
In what scenarios would the input bias current of 20 nA become problematic, and how does this compare to FET-input op-amps?
The 20 nA bias current limits usability with high-resistance source impedances (>1 MΩ), where voltage drops across resistor mismatches cause significant gain error. For example, a 10 MΩ source with 1% tolerance produces 200 µV offset due to bias current alone—comparable to the 100 µV input offset voltage. While superior to bipolar-input types, it falls short of JFET or CMOS devices (<1 pA). Thus, for pH probes, thermistor arrays, or piezoelectric sensors, external buffering or impedance transformation may be necessary.
How reliable is the rail-to-rail output stage under varying load conditions, and does output saturation depend on supply voltage?
The output stage achieves rail-to-rail swing but with current-dependent limitations. At 50 mA load and 5 V supply, output drop increases nonlinearly near rails due to internal resistance and thermal effects. Lower supply voltages exacerbate this effect—output may saturate earlier than expected. Measurements show less than 50 mV drop at mid-load, but up to 300 mV at full swing on 3 V rails. Load regulation degrades slightly at extreme temperatures, so datasheet curves should guide final design margins.
What role does the ECCN classification play in global sourcing and export compliance for the OPA2251PA?
Classified under ECCN EAR99, the OPA2251PA is considered a commodity item with minimal export restrictions. Most countries allow unrestricted commercial import, simplifying procurement for international projects. However, end-use verification is still required for certain military or aerospace applications, as EAR99 does not guarantee exemption from additional licensing. Suppliers typically provide standard certificates of conformance without ITAR controls, facilitating broad distribution.

Parts with Similar Specifications

The three parts on the right have similar specifications to Burr Brown OPA2251PA

Product Attribute OPA2251PAG4 OPA2251PA OPA2251PAG4 OPA2251UA
Part Number OPA2251PAG4 OPA2251PA OPA2251PAG4 OPA2251UA
Manufacturer Texas Instruments Texas Instruments Burr Brown Texas Instruments
Number of Circuits - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Current - Output / Channel - - - -
Amplifier Type - - - -
Gain Bandwidth Product - - - -
Slew Rate - - - -
Voltage - Supply Span (Max) - - - -
Current - Supply - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Input Offset - - - -
Voltage - Supply Span (Min) - - - -
Series - - - -
Current - Input Bias - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
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United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
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OPA2251PA

Burr Brown
32D-OPA2251PA

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