Part Number: OPA129U

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of OPA129U

Datasheet  OPA129U datasheet
Category Integrated Circuits (ICs)
Family Linear – Amplifiers – Instrumentation, OP Amps, Buffer Amps
Manufacturer Texas Instruments
Series Difet?
Packaging Tube
Part Status Active
Amplifier Type General Purpose
Number of Circuits 1
Output Type
Slew Rate 2.5 V/μs
Gain Bandwidth Product 1MHz
-3db Bandwidth
Current – Input Bias 0.03pA
Voltage – Input Offset 1mV
Current – Supply 1.2mA
Current – Output / Channel 10mA
Voltage – Supply, Single/Dual (±) 10 V ~ 36 V, ±5 V ~ 18 V
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SOIC


Operational amplifiers, or op-amps, are the workhorses of electrical circuitry. They are used in a wide range of situations and are crucial to their success. Among these many different kinds of parts, the OPA129U stands out as a great performer. It combines precision, reliability, and flexibility in an amazing way.

This detailed guide will help you understand the OPA129U operational amplifier and use all of its capabilities. This guide is meant to give you a deep dive into the OPA129U, whether you are an experienced engineer who wants to improve your ideas or a curious hobbyist who wants to learn more about analog electronics.

Introduction to Operational Amplifiers (Op-Amps)

Operational amplifiers, more commonly referred to as op-amps, are essential electrical components that are well-known for the adaptability and breadth of applications to which they may be put. Integrated circuits (ICs) like these are necessary for the development of modern electronics because of their ability to amplify voltage signals and carry out mathematical computations.

Purpose and Importance

The OPA129U is not simply another operational amplifier; rather, it is a specialist instrument that was developed to excel in circumstances that need exceptionally low bias current performance. Bias current, also known as the very little current that flows into or out of the inputs of an operational amplifier (op-amp), may not seem like a big deal, but in applications that require a high level of precision, it can cause errors and reduce accuracy. In this respect, the OPA129U really comes into its own.

Why is the OPA129U Important?

  1. Ultra-Low Bias Current:The OPA129U has an unusually low bias current, which helps to reduce errors in high-impedance circuits and ensures correct signal processing even in demanding applications.
  2. High Precision:Its precision and accuracy make it a top choice for instrumentation amplifiers, sensor interfaces, and medical devices where data integrity is paramount.
  3. Wide Temperature Range:With an operational range from -40°C to 125°C, the OPA129U remains dependable even in extreme environmental conditions.
  4. 8-SOIC Package:Its 8-SOIC (Small Outline Integrated Circuit) package offers convenience and versatility in circuit design and board layout.

Features and Benefits

Bias Current

When discussing operational amplifiers, often known as op-amps, the term “bias current” refers to the low-amplitude, constant current that goes into or out of the inputs of the amplifier. It is not uncommon for this current to flow unintentionally, and its presence can introduce mistakes into specific applications, especially those using high-impedance input circuits.

When it comes to applications in which precision and accuracy are of the utmost importance, ultra-low bias current is an essential attribute. The delicate balance of voltage signals in such circuits can be thrown off by excessively high bias currents, which can result in inaccurate measurements or a degradation of the signal. Because of its exceptionally low bias current, the OPA129U is ideally suited for use in applications such as sensor interfaces, medical instrumentation, and data gathering systems. This is because interference with the input signal is kept to a minimum.

Precision and Accuracy

The capacity of an operational amplifier to give results that are reliable and consistent is referred to as its precision. The OPA129U performs exceptionally well in this regard and provides a high level of precision and accuracy in signal processing. Its low noise, excellent common-mode rejection ratio (CMRR), and low offset voltage all contribute to its precision. This ensures that the output closely matches the input, even in challenging settings.

This level of precision is particularly useful in applications such as instrumentation amplifiers, in which minute voltage variations must be correctly amplified, and in medical devices, in which patient safety depends on exact readings. Both of these applications require a high degree of accuracy.

Temperature Range Significance

The OPA129U has an excellent operating temperature range of -40°C to 125°C. This broad range is significant for a number of reasons. For starters, it enables the OPA129U to operate dependably in harsh environmental circumstances, making it suited for outdoor applications, automotive systems, and temperature-sensitive industrial processes.

Furthermore, the wide temperature range increases the amplifier’s adaptability, allowing it to be used in a variety of applications across industries. The OPA129U retains its performance in extreme temperatures, giving reliable results across a wide range of settings.

8-SOIC Package

  • Package Type:The 8-SOIC package of the OPA129U combines compact dimensions with ease of integration. It works well in small-space designs, simplifies PCB layouts, and is widely available. It’s a fantastic alternative for tasks with limited space.


Precision Instrumentation

OPA129U finds a natural home in high-precision measurement equipment. Here’s how it enhances precision instrumentation:

  • Accuracy: The OPA129U ensures reliable voltage readings in equipment such as digital multimeters and oscilloscopes where precision is critical. Its low bias current reduces errors in high-impedance circuits, ensuring accurate readings.
  • Low Noise:Precision instruments frequently operate with faint signals. The low noise performance of the OPA129U guarantees that even tiny fluctuations in signals are properly caught, preserving overall precision.

Sensor Interfaces

The OPA129U shines when interacting with sensors, particularly those with low bias current requirements such as photodiodes and pyroelectric sensors. It protects the integrity of sensitive sensor outputs, making it a perfect choice for signal amplification and conditioning jobs.

Medical Devices

The OPA129U is a reliable component in the medical area, where precision and accuracy are critical. It ensures reliable data recording in equipment like ECG machines and blood glucose meters, allowing for more exact diagnosis and patient treatment. Because of its low power consumption, it is also appropriate for battery-powered medical equipment.


The OPA129U is more than simply an operational amplifier; it is a precision tool that enables engineers, researchers, and hobbyists in a variety of sectors. Because of its ultra-low bias current, precision, and wide temperature range, it is invaluable in assuring data accuracy, minimizing errors, and functioning reliably in a variety of settings.

The OPA129U is critical in obtaining the highest accuracy in data collecting and processing, from precision instruments to sensor interfaces and critical medical equipment. Its adaptability and consistent performance make it a valuable asset in the world of electronics, enabling innovation and excellence in a wide range of applications.

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