Tuning Varactor: Capacitance Range 0.5-100 pF

Component Specifications

Definition

A tuning varactor is a specialized semiconductor diode designed to function as a voltage-controlled capacitor in electronic circuits, primarily within local oscillator (LO) subsystems. Its capacitance changes predictably with reverse bias voltage, enabling precise frequency tuning in RF and microwave applications such as communication systems, radar, and test equipment.

Working Principle

Operates on the principle of a reverse-biased p-n junction, where the depletion region width varies with applied voltage, altering the junction capacitance. This voltage-dependent capacitance (C-V characteristic) allows electronic tuning of resonant circuits, replacing mechanical variable capacitors.

Materials

Silicon (Si) or Gallium Arsenide (GaAs) semiconductor substrate; doped regions forming p-n junction; metal contacts (e.g., gold, aluminum); ceramic or plastic encapsulation.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Q Factor	50-500 at 50 MHz
Tuning Ratio	2:1 to 10:1
Breakdown Voltage	15-60 V
Capacitance Range	0.5-100 pF
Operating Frequency	Up to 10 GHz

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 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Local Oscillator (LO)

A stable frequency source used in transmitters to generate the carrier signal for modulation.

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Engineering Analysis

Risks & Mitigation

Thermal drift affecting capacitance stability
Voltage overstress causing breakdown
Parameter variation due to manufacturing tolerances

FMEA Triads

Trigger: Excessive reverse voltage
Failure: Junction breakdown leading to short circuit
Mitigation: Implement voltage clamping circuits and adhere to maximum ratings

Trigger: High operating temperature
Failure: Capacitance drift and reduced Q factor
Mitigation: Use thermal management and select components with low temperature coefficients

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Capacitance tolerance typically ±5% to ±20%; voltage coefficient specified in datasheets

Test Method

Capacitance-voltage (C-V) measurement at specified frequencies; Q factor testing; thermal cycling per JEDEC standards

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 Tuning Varactor

Manufacturer profiles associated with Tuning Varactor.

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Frequently Asked Questions

What is the main function of a tuning varactor in a local oscillator?

It provides electronic frequency tuning by varying capacitance with applied voltage, enabling precise control of the oscillator's output frequency without mechanical adjustments.

How does a varactor differ from a regular diode?

While both are p-n junction devices, a varactor is optimized for capacitance variation under reverse bias, whereas regular diodes are designed for rectification or switching in forward bias.

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.

Tuning Varactor