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Reference resistor Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A reference resistor is a high-precision, low-temperature-coefficient resistor used in current source cells to establish a stable voltage drop that determines the output current. It serves as the primary accuracy-determining element in precision current sources by providing a known resistance value with minimal drift over time and temperature variations.

Working Principle

Operates based on Ohm's Law (V=IR) where a precise voltage applied across the reference resistor generates a corresponding current. The resistor's stable resistance value ensures consistent current output regardless of load variations or environmental changes.

Materials

Thin-film metal alloy (nickel-chromium or tantalum nitride) on ceramic substrate, gold-plated copper terminals, epoxy encapsulation

Technical Parameters

Stability ±25ppm/year
Tolerance ±0.01% to ±0.1%
Power Rating 0.1W to 1W
Resistance Range 0.1Ω to 10kΩ
Operating Temperature -55°C to +125°C
Temperature Coefficient ±1ppm/°C to ±10ppm/°C

Standards

IEC 60115, MIL-PRF-914, ASTM B809

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Reference resistor.

Parent Products

This component is used in the following industrial products

Current source cell

A fundamental electronic component that generates and regulates a constant current output within a resistor network or current source array.

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Engineering Analysis

Risks & Mitigation

Resistance drift over time
Thermal runaway at high currents
Contamination from environmental exposure
Mechanical stress damage
Solder joint degradation

FMEA Triads

Trigger: Overheating due to excessive current
Failure: Resistance value permanent shift
Mitigation: Implement current limiting circuits and thermal monitoring

Trigger: Moisture ingress
Failure: Corrosion and resistance instability
Mitigation: Use hermetic sealing and conformal coatings

Trigger: Mechanical vibration
Failure: Internal connection failure
Mitigation: Secure mounting with vibration dampeners

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.01% to ±0.1% per IEC 60115-8

Test Method

Four-wire Kelvin measurement at controlled temperature (23±1°C) after 24-hour stabilization

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What makes a reference resistor different from standard resistors?

Reference resistors feature ultra-low temperature coefficients (±1-10ppm/°C vs ±100-200ppm/°C for standard), tighter tolerances (0.01-0.1% vs 1-5%), and superior long-term stability (25ppm/year vs 1000ppm/year).

How does temperature affect reference resistor performance?

High-quality reference resistors use materials with minimal resistance change versus temperature (low TCR). Temperature-controlled environments or compensation circuits further minimize thermal effects on current source accuracy.

What maintenance do reference resistors require?

Reference resistors require periodic calibration (typically annually), protection from mechanical stress, and operation within specified temperature/power limits to maintain specified accuracy.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Reference resistor