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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsOPA2251UA
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OPA2251UA - Texas Instruments

Manufacturer Part Number
OPA2251UA
Manufacturer
Texas Instruments
Allelco Part Number
32D-OPA2251UA
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,582 pcs available, New & Original
Parts Description
IC OPAMP GP 2 CIRCUIT 8SOIC
Package
8-SOIC
Data sheet
OPA2251UA.pdf

Datasheets

OPA251PA.pdf
RoHs Status
ROHS3 Compliant
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Specifications

OPA2251UA Tech Specifications
Texas Instruments - OPA2251UA technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - OPA2251UA

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply Span (Min) 2.7 V
Voltage - Supply Span (Max) 36 V
Voltage - Input Offset 100 µV
Supplier Device Package 8-SOIC
Slew Rate 0.01V/µs
Series microPOWER™
Package / Case 8-SOIC (0.154", 3.90mm Width)
Package Tube
Output Type Rail-to-Rail
Product Attribute Attribute Value
Operating Temperature -40°C ~ 85°C
Number of Circuits 2
Mounting Type Surface Mount
Gain Bandwidth Product 35 kHz
Current - Supply 27µA (x2 Channels)
Current - Output / Channel 50 mA
Current - Input Bias 20 nA
Base Product Number OPA2251
Amplifier Type General Purpose

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99

Parts Introduction

OPA2251UA Image
OPA2251UA (1)

Manufacturer Part Number

OPA2251UA

Manufacturer

Texas Instruments

Introduction

The OPA2251UA is a high-performance, low-power, dual operational amplifier (op-amp) designed for a wide range of applications.

Product Features and Performance

Dual op-amp in a single package

Rail-to-rail input and output

Very low power consumption

Wide supply voltage range of 2.7V to 36V

High gain bandwidth of 35kHz

Very low input offset voltage of 100μV

Low input bias current of 20nA

Slew rate of 0.01V/μs

Output current capability of 50mA per channel

Product Advantages

Ideal for battery-powered and other low-power applications

Versatile performance for various instrumentation and control applications

Excellent DC and AC characteristics

Small 8-SOIC package

Key Technical Parameters

Supply voltage range: 2.7V to 36V

Gain bandwidth product: 35kHz

Input offset voltage: 100μV

Input bias current: 20nA

Slew rate: 0.01V/μs

Output current: 50mA per channel

Quality and Safety Features

RoHS3 compliant

Designed for reliable operation in industrial and commercial applications

Compatibility

Surface mount 8-SOIC package

Compatible with a wide range of electronic systems and circuits

Application Areas

Instrumentation and control systems

Battery-powered devices

Portable equipment

Sensor conditioning circuits

Precision analog circuits

Product Lifecycle

This product is currently in production and widely available.

Texas Instruments provides ongoing support and potential future upgrades or replacements.

Several Key Reasons to Choose This Product

Excellent performance characteristics, including low power, high bandwidth, and low offset/bias current

Versatile dual op-amp design for a wide range of applications

Small and efficient 8-SOIC package

Reliable operation and RoHS3 compliance

Long-term support and potential for future upgrades from Texas Instruments

Frequently Asked Questions(FAQ)

How does the OPA2251UA's input bias current compare to other general-purpose op-amps in its class, and what implications does this have for precision analog designs?
The OPA2251UA features an input bias current of just 20 nA, which is notably low compared to many standard general-purpose amplifiers. This characteristic reduces errors in high-impedance sensor interfaces and minimizes offset voltage drift over time, making it suitable for applications requiring long-term stability. However, when interfacing with sources exceeding 1 MΩ impedance, even 20 nA can induce significant voltage drops—potentially hundreds of millivolts across a megaohm node. Designers must account for this through proper layout techniques or consider even lower bias current devices if higher source impedances are expected.
What are the key trade-offs between using the OPA2251UA versus higher-performance amplifiers like the LT1881IS8#PBF in battery-powered instrumentation systems?
While the LT1881IS8#PBF offers superior specifications such as lower noise and higher bandwidth, the OPA2251UA provides significant power savings with a supply current of only 27 µA per channel. In battery-operated systems where duty cycling isn't feasible, this translates to extended operation—potentially months on a single coin cell. The OPA2251UA’s rail-to-rail output also ensures maximum dynamic range at low supply voltages (as low as 2.7 V), whereas alternatives may require more headroom. However, designers should verify that the reduced slew rate (0.01 V/µs) and limited gain-bandwidth product (35 kHz) do not constrain signal integrity in fast or wideband applications.
Can the OPA2251UA reliably drive capacitive loads beyond 100 pF without additional compensation, and how might this affect stability in feedback-intensive circuits?
The OPA2251UA has limited drive capability for heavy capacitive loads due to its relatively modest open-loop gain and phase margin. Without external series resistance, oscillations may occur when driving loads greater than approximately 100 pF, especially in unity-gain configurations. To stabilize such conditions, a small resistor (typically 2–10 Ω) should be inserted between the output and the capacitor. This damping technique trades some transient response speed for robustness but preserves functionality in sensor buffering or filter stages with inherent capacitance.
What impact does the OPA2251UA’s 100 µV input offset voltage have on gain accuracy in precision measurement channels using non-instrumentation amplifier topologies?
With an input offset voltage of 100 µV, the OPA2251UA introduces a fixed error at the input stage that scales directly with closed-loop gain. For example, in a 100x gain configuration, this results in an absolute error of 10 mV at the output—significant in millivolt-level measurement systems. While this level is acceptable for many industrial control loops, it limits suitability for direct use in precision bridges or thermocouple amplifiers where sub-millivolt accuracy is required. External nulling circuitry or post-calibration routines may be necessary to mitigate this limitation.
How should thermal performance be considered when deploying multiple OPA2251UA devices in compact PCB layouts with limited airflow?
Although the OPA2251UA consumes minimal power (≈1 mW per channel at 5 V), densely populated boards with several units can still experience localized heating. The 8-SOIC package has moderate thermal dissipation characteristics, and continuous output currents up to 50 mA generate measurable heat under sustained load. Designers should avoid placing these ICs near temperature-sensitive components and ensure adequate copper pour or thermal relief paths. In high-density environments, monitoring junction temperature via simulation tools becomes prudent, particularly when operating near the upper end of the –40°C to +85°C range.
Is the OPA2251UA suitable for driving relays or solenoids directly, or does it necessitate external buffer stages based on its output drive capabilities?
The OPA2251UA can deliver up to 50 mA per channel into a resistive load, which is sufficient to energize many small relays or solenoid valves rated below 100 mA. However, inductive kickback from such loads requires flyback diodes across the coil to protect the output stage. Direct drive is feasible within specified limits, but marginal cases involving long traces or parasitic inductance may cause voltage spikes exceeding the ±36 V supply rails. In safety-critical or high-reliability designs, opto-isolated or MOSFET-based driver stages remain advisable despite added complexity.
How does the microPOWER™ architecture of the OPA2251UA influence its behavior during power-up and power-down sequences in mixed-voltage systems?
The microPOWER™ design optimizes quiescent current draw but often incorporates aggressive power-down modes that reduce leakage further—sometimes below 1 µA. During power sequencing, this can delay turn-on response or create undefined states if inputs float during ramp-up. To prevent latch-up or excessive inrush, input protection diodes must not be forward-biased beyond safe thresholds. Adding pull-down resistors on floating inputs or synchronizing enable signals with system voltage rails enhances robustness in multi-supply environments.
What considerations apply when substituting the OPA2251UA with AD823AARZ-R7 or LT1884CS8#PBF in existing designs, given their different performance profiles?
Substitution requires careful evaluation of dynamic range, noise floor, and bandwidth requirements. The AD823AARZ-R7 offers higher bandwidth and lower noise, beneficial for audio or RF conditioning, while the LT1884CS8#PBF supports higher output currents and faster slewing. However, these devices typically consume more power and operate over wider voltage ranges, potentially disrupting low-voltage, energy-conscious architectures. Electrical compatibility depends on matching gain structures, feedback networks, and output swing expectations—especially critical in space-constrained or thermally limited applications where the OPA2251UA’s efficiency excels.
How does the OPA2251UA handle common-mode voltage near the supply rails, and what constraints exist for single-supply operation below 3 V?
As a rail-to-rail input/output amplifier, the OPA2251UA maintains full functionality with input signals within approximately 100 mV of either supply rail at low voltages. At 2.7 V supplies, this means inputs spanning 2.6 V to 2.8 V are fully supported. However, performance degrades near the extremes due to internal transistor limitations; gain accuracy and linearity suffer outside the central region. For single-supply systems below 3 V, bypass capacitors and stable reference voltages become essential to maintain headroom and avoid saturation during signal transients.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments OPA2251UA

Product Attribute OPA2251UA/2K5 OPA2251UA/2K5G4 OPA2251PA OPA2251PAG4
Part Number OPA2251UA/2K5 OPA2251UA/2K5G4 OPA2251PA OPA2251PAG4
Manufacturer Texas Instruments Texas Instruments Burr Brown Texas Instruments
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input Offset - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Current - Output / Channel - - - -
Voltage - Supply Span (Min) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Slew Rate - - - -
Voltage - Supply Span (Max) - - - -
Series - - - -
Amplifier Type - - - -
Current - Input Bias - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Gain Bandwidth Product - - - -
Current - Supply - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Circuits - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42

OPA2251UA Datasheet PDF

Download OPA2251UA pdf datasheets and Texas Instruments documentation for OPA2251UA - Texas Instruments.

Datasheets
OPA251PA.pdf

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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
Europe Germany 5
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:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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OPA2251UA Image

OPA2251UA

Texas Instruments
32D-OPA2251UA

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