Editorial Technical Reference

Operational Amplifier

This page explains how Operational Amplifier is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A high-gain electronic voltage amplifier with differential inputs and a single output, designed for use in signal conditioning circuits.

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Product Specifications

Technical details and manufacturing context for Operational Amplifier

Definition
An operational amplifier is a fundamental electronic component within a signal conditioning circuit that amplifies, filters, or modifies analog signals. It serves as the core active element for performing mathematical operations (addition, subtraction, integration, differentiation) on input signals, preparing them for further processing, measurement, or control by downstream systems like analog-to-digital converters or controllers. This directory entry covers general-purpose operational amplifiers used in industrial electronics. The device is a high-gain voltage amplifier with differential inputs (inverting and non-inverting) and a single-ended output. It is typically powered by dual supplies (e.g., ±2.25 V to ±18 V) or a single supply (4.5 V to 36 V). Key parameters include input offset voltage (0.1–5 mV), input bias current (0.5–100 nA), gain bandwidth product (1–100 MHz), slew rate (0.5–20 V/µs), common-mode rejection ratio (70–120 dB), power supply rejection ratio (80–120 dB), operating temperature range (-40°C to 85°C for industrial grade), output current (20–40 mA), input voltage range (-0.1 V to Vcc+0.1 V), and quiescent current (0.5–5 mA). Common package types include SOT-23-5 and SOIC-8. The primary material is semiconductor silicon. These values are typical ranges; actual specifications vary by model and manufacturer. Always verify model-specific parameters and standards with the legal manufacturer or supplier before procurement or design.
Working Principle
An operational amplifier amplifies the voltage difference between its two input terminals (inverting and non-inverting) by a very high factor (open-loop gain). In practical circuits, external feedback networks (resistors, capacitors) are connected between the output and inputs to control the exact gain and function (e.g., inverting amplifier, non-inverting amplifier, integrator, differentiator, comparator) as required by the signal conditioning task. The feedback network determines the closed-loop transfer function, enabling precise amplification or mathematical operations. The device's high input impedance and low output impedance allow it to interface with various sensors and loads without significant loading effects. The slew rate limits the maximum rate of output voltage change, affecting large-signal response. The gain bandwidth product defines the frequency range over which the amplifier maintains its gain. Common-mode rejection ratio indicates the ability to reject signals common to both inputs, while power supply rejection ratio indicates immunity to supply voltage variations. These characteristics are essential for selecting the appropriate operational amplifier for a given signal conditioning application.
Common Materials
Semiconductor Silicon
Technical Parameters
ParameterTypical rangeNotes & selection driver
Supply Voltage±2.25–±18 VDual supply typical; single supply 4.5–36 V
Input Offset Voltage0.1–5 mVLower is better for precision DC
Input Bias Current0.5–100 nABipolar inputs higher; CMOS lower
Gain Bandwidth Product1–100 MHzDetermines usable frequency range
Slew Rate0.5–20 V/µsAffects large-signal response
Common Mode Rejection Ratio70–120 dBHigher rejects common-mode noise
Power Supply Rejection Ratio80–120 dBHigher reduces supply noise
Operating Temperature Range-40–85 °CIndustrial grade; military -55–125
Package TypeSOT-23-5Common small outline; also SOIC-8
Output Current20–40 mAShort-circuit protected typical
Input Voltage Range-0.1–Vcc+0.1 VRail-to-rail input available
Quiescent Current0.5–5 mALow power for battery apps

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Differential Input Stage Part
    Amplifies the voltage difference between the inverting and non-inverting input terminals.
    Material: Semiconductor (Transistors)
  • Gain Stage
    Provides high voltage amplification of the signal from the input stage.
    Material: Semiconductor (Transistors)
  • Output Stage Part
    Provides current amplification to drive the load connected to the output pin with low output impedance.
    Material: Semiconductor (Transistors)

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Amplifier Circuit
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Output Buffer Amplifier
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Analog Front-End
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Shaper/Filter
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Signal Conditioning ICs
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Buffer Amplifier
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Transimpedance Amplifier
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Preamplifier circuit
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Signal Conditioning Amplifier
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Compensation Amplifier/Network
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
voltage: Supply voltage range (e.g., ±5V to ±18V)
other spec: Gain bandwidth product, slew rate, input offset voltage
temperature: -40°C to +85°C
Media Compatibility
✓ PCB-mounted signal conditioning circuits ✓ Low-voltage instrumentation systems ✓ Precision measurement equipment
Unsuitable: High-voltage power distribution environments
Sizing Data Required
  • Required gain and bandwidth
  • Supply voltage constraints
  • Input signal characteristics (amplitude, frequency)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal runaway
Cause: Excessive power dissipation due to improper heat sinking, high ambient temperatures, or short-circuit conditions leading to semiconductor junction overheating and permanent damage.
Latch-up
Cause: Transient voltage spikes or improper power sequencing inducing parasitic thyristor action within the IC, causing high current flow and potential destruction unless power is cycled.
Maintenance Indicators
  • Audible high-frequency oscillation or squealing from the circuit, indicating instability or feedback issues.
  • Visual signs of overheating such as discoloration, bubbling, or charring of the op-amp package or nearby components on the PCB.
Engineering Tips
  • Implement proper decoupling: place 0.1µF ceramic capacitors as close as possible to the power supply pins and use bulk capacitors (e.g., 10µF) on the supply rails to filter noise and prevent instability.
  • Ensure thermal management: calculate power dissipation, use adequate heat sinking if needed, maintain ambient temperature within datasheet limits, and avoid placing near heat sources to prevent thermal stress.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
MIL-PRF-38535: Integrated Circuits (Microcircuits) Manufacturing, General Specification for EN 60747-5-2: Semiconductor devices - Discrete devices - Part 5-2: Optoelectronic devices - Essential ratings and characteristics

Quoted from the published standard.

Manufacturing Precision
  • Input offset voltage: +/- 0.5 mV
  • Gain bandwidth product: +/- 10%
Quality Inspection
  • Electrical Parameter Testing (DC and AC characteristics)
  • Environmental Stress Screening (ESS) including temperature cycling and burn-in

Manufacturers of Operational Amplifier

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Frequently Asked Questions

What is the typical supply voltage range for an operational amplifier?

Typical dual supply is ±2.25 V to ±18 V, or single supply 4.5 V to 36 V. Always check the datasheet for the specific model.

What does the gain bandwidth product indicate?

It indicates the frequency at which the open-loop gain drops to unity. It determines the usable frequency range for a given closed-loop gain.

How does input offset voltage affect precision?

Input offset voltage is the differential voltage required to make the output zero. Lower values are better for precision DC applications.

What package types are common?

Common packages include SOT-23-5 and SOIC-8. The actual package depends on the manufacturer and model.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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