Input Resistor: Voltage Rating 200V to 500V

Component Specifications

Definition

A passive electronic component used in operational amplifier input stages to set input impedance, establish bias currents, limit input current, and define gain when used in feedback configurations. It converts input voltage to current according to Ohm's Law (V=IR) and is critical for signal conditioning, impedance matching, and circuit protection.

Working Principle

Operates on Ohm's Law (V=IR) to limit current flow into the operational amplifier input, establish input impedance, and set voltage division ratios. In non-inverting configurations, it works with feedback resistors to determine closed-loop gain. In inverting configurations, it defines input current and works with feedback resistors to set gain. Also provides DC bias paths and protects against excessive input currents.

Materials

Carbon film, metal film (nichrome or tantalum nitride), thick film, thin film, or wirewound construction. Substrate: ceramic (alumina), fiberglass, or plastic. Terminations: tin-plated copper, gold-plated, or solder-coated. Coating: epoxy, silicone, or conformal coating for protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.1% to ±5%
Resistance	10Ω to 10MΩ (typical)
Power Rating	0.125W to 0.5W (common)
Voltage Rating	200V to 500V
Operating Temperature	-55°C to +155°C
Temperature Coefficient	±25ppm/°C to ±100ppm/°C

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

Standards

IEC 60115, MIL-PRF-22684

Parent Products

This component is used in the following industrial products

Operational Amplifier Circuit

An electronic circuit that uses operational amplifiers to amplify, filter, or condition analog signals.

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Engineering Analysis

Risks & Mitigation

Thermal runaway from excessive power dissipation
Noise introduction (Johnson-Nyquist noise)
Parasitic capacitance affecting high-frequency response
Value drift with temperature changes
Electrostatic discharge damage

FMEA Triads

Trigger: Overvoltage or excessive current
Failure: Resistor opens or changes value
Mitigation: Implement current limiting, use resistors with adequate power ratings, add protection diodes

Trigger: Thermal stress from high ambient temperatures
Failure: Value drift beyond tolerance
Mitigation: Select resistors with appropriate temperature coefficients, ensure adequate ventilation, use thermal management

Trigger: Moisture ingress or contamination
Failure: Corrosion or short circuits
Mitigation: Use conformal coatings, select sealed resistor packages, maintain clean manufacturing environment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% to ±5% depending on application requirements

Test Method

IEC 60115-1 for electrical parameters, MIL-STD-202 for environmental testing, IPC-A-610 for acceptability of electronic assemblies

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Input Resistor

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Frequently Asked Questions

What is the primary function of an input resistor in an operational amplifier circuit?

The primary function is to set the input impedance, limit input current to protect the op-amp, establish bias currents, and work with feedback resistors to determine circuit gain in amplifier configurations.

How do I select the appropriate input resistor value for my op-amp circuit?

Consider the required input impedance, desired gain (with feedback resistors), bias current requirements, noise performance (lower values reduce thermal noise), and power dissipation. Typical values range from 1kΩ to 100kΩ for general-purpose applications.

What are the consequences of using an incorrect input resistor value?

Incorrect values can cause excessive bias currents, improper gain, increased noise, signal distortion, thermal issues from power dissipation, or damage to the operational amplifier from excessive input currents.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Input Resistor