Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Variable Capacitance (Varicaps, Varactors)

Microchip Technology GC15008-79

Name: GC15008-79
Brand: Microchip Technology
SKU: GC15008-79
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: GC15008-79

Manufacturer:: Microchip Technology

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: 2-SMD, No Lead

Datasheet:: GC15008-79.pdf

Description:: SI TVAR HERMETIC PILL

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,182

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

GC15008-79 from Microsemi is a frequency-linear tuning varactor diode designed for high-linearity voltage-controlled oscillator (VCO) and filter applications in Ku-band systems. It features 2.0 pF capacitance at −4 V, 0.4 pF at −20 V, 13:1 tuning ratio (C_J0/C_J20), 0.11 sensitivity, and typical Q of 900 at 4 V/50 MHz - enabling octave-wide linear tuning without external linearization circuitry.

For engineers reviewing the GC15008-79 datasheet, GC15008-79 pinout, GC15008-79 application, or GC15008-79 equivalent, this part supports low-FM-noise VCOs, modulated oscillators, and high-Q tunable filters where constant sensitivity and wideband linearity are critical design requirements.

Technical Context

The GC15008-79 employs computer-controlled grown junction epitaxy to achieve precise C–V slope control, delivering consistent 0.11 sensitivity across its operating range. Its silicon epitaxial mesa structure provides low surface noise and leakage current ≤50 nA at 20 V, supporting stable biasing in high-frequency analog tuning circuits.

This device operates from −55 °C to +125 °C and is rated for storage up to +150 °C. It is RoHS-compliant with gold terminal finish and optimized for use in hybrid microwave assemblies or surface-mount configurations requiring minimal parasitic capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
C_J @ −4 V	2.0 pF ±10% - sets nominal center frequency in VCO tank circuits
C_J @ −20 V	0.4 pF (typ) - enables wide tuning range up to Ku-band (12–18 GHz)
Tuning Ratio C_J0/C_J20	13:1 (typ) - supports >1-octave linear frequency sweep without correction
Sensitivity (S)	0.11 (typ) - ensures constant modulation gain across bias range
Q @ 4 V / 50 MHz	900 (typ) - reduces phase noise and improves VCO spectral purity
Max Leakage @ 20 V	50 nA - maintains stable bias point and low power consumption
Operating Temp	−55 °C to +125 °C - suitable for aerospace, defense, and industrial RF modules

Pinout & Package

GC15008-79 is supplied in Package Style 79 - a hermetic, stripline-compatible surface-mount package optimized for microwave hybrid circuits. This package minimizes parasitic capacitance and preserves C–V linearity at high bias voltages.

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC Bias Input / RF Ground Reference	Connected to RF ground plane in stripline layout; accepts reverse-bias voltage for capacitance tuning
Cathode	Tuning Node / RF Signal Path	Integrated into resonant tank or filter network; capacitance variation directly controls frequency

Key Features

Feature	Design Value
Frequency-linear C–V response	0.11 sensitivity enables constant modulation index and eliminates need for varactor linearization networks
High Q at RF frequencies	900 at 4 V/50 MHz reduces VCO close-in phase noise and improves signal integrity
Low surface noise epitaxial structure	Minimizes FM noise contribution in modulated VCOs and sensitive receiver front-ends
RoHS-compliant gold termination	Ensures reliable solderability and long-term interconnect stability in lead-free assembly processes

Applications

Phase-Noise-Sensitive VCOs	Ku-Band Tunable Filters
Use Scenario: Low-phase-noise local oscillator generation for satellite communications transceivers operating at 14 GHz. IC Role / Device Role / Timing Role: Voltage-controlled tuning element in parallel-resonant LC tank, defining instantaneous output frequency. Use Value: 900 Q and 0.11 sensitivity maintain <−110 dBc/Hz @ 10 kHz offset and enable direct digital modulation without predistortion.	Use Scenario: Reconfigurable bandpass filtering in phased-array radar front-ends requiring rapid channel switching. IC Role / Device Role / Timing Role: Tunable shunt capacitance in coupled-line filter topology, adjusting center frequency under DC bias control. Use Value: 13:1 tuning ratio supports 12–18 GHz coverage with single-component solution and no mechanical tuning elements.
Linear Modulated Oscillators	Wideband Amplifier Matching Networks
Use Scenario: Frequency-modulated source for test equipment generating chirped waveforms across 10–16 GHz. IC Role / Device Role / Timing Role: Primary frequency deviation element in wideband FM VCO, driven by analog modulation voltage. Use Value: Constant 0.11 sensitivity ensures linear frequency vs. voltage relationship over full 0–20 V tuning range.	Use Scenario: Adaptive impedance matching in GaN power amplifier output stages for multi-band 5G base station radios. IC Role / Device Role / Timing Role: Bias-tunable reactance in L-match network, dynamically optimizing PA load-pull conditions. Use Value: Low leakage (≤50 nA) prevents DC drift in matching network bias, sustaining PA efficiency across temperature.

Phase-Noise-Sensitive VCOs

Ku-Band Tunable Filters

Use Scenario: Low-phase-noise local oscillator generation for satellite communications transceivers operating at 14 GHz.

IC Role / Device Role / Timing Role: Voltage-controlled tuning element in parallel-resonant LC tank, defining instantaneous output frequency.

Use Value: 900 Q and 0.11 sensitivity maintain <−110 dBc/Hz @ 10 kHz offset and enable direct digital modulation without predistortion.

Use Scenario: Reconfigurable bandpass filtering in phased-array radar front-ends requiring rapid channel switching.

IC Role / Device Role / Timing Role: Tunable shunt capacitance in coupled-line filter topology, adjusting center frequency under DC bias control.

Use Value: 13:1 tuning ratio supports 12–18 GHz coverage with single-component solution and no mechanical tuning elements.

Linear Modulated Oscillators

Wideband Amplifier Matching Networks

Use Scenario: Frequency-modulated source for test equipment generating chirped waveforms across 10–16 GHz.

IC Role / Device Role / Timing Role: Primary frequency deviation element in wideband FM VCO, driven by analog modulation voltage.

Use Value: Constant 0.11 sensitivity ensures linear frequency vs. voltage relationship over full 0–20 V tuning range.

Use Scenario: Adaptive impedance matching in GaN power amplifier output stages for multi-band 5G base station radios.

IC Role / Device Role / Timing Role: Bias-tunable reactance in L-match network, dynamically optimizing PA load-pull conditions.

Use Value: Low leakage (≤50 nA) prevents DC drift in matching network bias, sustaining PA efficiency across temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar frequency-linear tuning varactor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
GC15008-00	Chip-only form; no package parasitics but requires hybrid mounting and wire bonding	Better high-frequency linearity above 18 GHz; unsuitable for SMT production	Select GC15008-00 only for custom microwave hybrids where package capacitance must be eliminated
GC15008-17	Hermetic stripline package; identical electrical specs but different mechanical footprint and thermal path	Higher reliability in sealed modules; compatible with MIL-STD-883 screening	Choose GC15008-17 when environmental ruggedness or hermeticity is required over cost-sensitive commercial designs

Compared with GC15008-00 and GC15008-17, the GC15008-79 offers optimized RF performance in a production-ready surface-mount format - balancing linearity, Q, and manufacturability for Ku-band VCOs without requiring custom assembly or hermetic sealing.

Availability

GC15008-79 is available at Aetrix Electronics and suitable for Ku-band VCOs, tunable filters, linear modulators, and adaptive RF matching networks requiring stable component supply and traceable sourcing.

Supply support for GC15008-79 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.

The GC15000 series was developed specifically for microwave frequency synthesis and filtering, emphasizing C–V linearity, low noise, and Ku-band operation in mission-critical RF systems.

FAQ

What is the primary function of the GC15008-79 in RF circuits?

The GC15008-79 functions as a frequency-linear tuning varactor diode, providing voltage-controlled capacitance for precise frequency adjustment in VCOs and tunable filters. Its 0.11 sensitivity and 13:1 tuning ratio allow linear octave-wide sweeps without external linearization - a key capability in Ku-band communication and radar systems where the GC15008-79 replaces legacy hyperabrupt diodes.

Does the GC15008-79 require external linearization circuitry?

No, the GC15008-79 does not require external linearization. Its engineered epitaxial junction delivers intrinsic frequency-linear C–V response with 0.11 sensitivity, enabling direct voltage-to-frequency mapping across its 0–20 V tuning range. This characteristic is validated in the GC15008-79 datasheet and eliminates compensation networks typically needed with standard abrupt-junction varactors.

What is the maximum operating temperature for the GC15008-79?

The GC15008-79 has a specified operating temperature range of −55 °C to +125 °C, making it suitable for extended-environment applications including avionics, ground-based radar, and industrial RF transceivers. This rating is confirmed in the absolute maximum ratings table of the official GC15008-79 datasheet and applies to all package variants including GC15008-79.

How does the Q factor of the GC15008-79 impact VCO phase noise?

The GC15008-79's typical Q of 900 at 4 V/50 MHz directly lowers close-in phase noise in VCO applications by reducing energy loss in the resonant tank. Higher Q yields steeper phase slope versus frequency, improving Leeson model noise suppression - a documented benefit in GC15008-79 application notes for low-noise oscillator design.

Is the GC15008-79 RoHS compliant and what is its terminal finish?

Yes, the GC15008-79 is RoHS compliant per EU Directive 2002/95/EC, and its standard terminal finish is gold. This ensures compatibility with lead-free reflow processes and long-term interconnect reliability - explicitly stated in the GC15008-79 product summary and mechanical specifications page.

GC15008-79 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 2-SMD, No Lead

Packaging:: Bulk

Product Status:: Active

Capacitance @ Vr, F:: 0.4pF @ 20V, 1MHz

Capacitance Ratio:: 13.0

Capacitance Ratio Condition:: C0/C20

Voltage - Peak Reverse (Max):: 22 V

Diode Type:: Single

Q @ Vr, F:: 900 @ 4V, 50MHz

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: -

GC15008-79 FAQ

1.How can I place an order for GC15008-79 through Aetrix?

Please submit a Request for Quotation (RFQ) for GC15008-79 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for GC15008-79 reliable?

The price and inventory of GC15008-79 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GC15008-79 is usually 5 days.

3.What payment methods are accepted for GC15008-79?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GC15008-79 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for GC15008-79?

GC15008-79 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your GC15008-79 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for GC15008-79?

For technical support, including GC15008-79 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GC15008-79 requirements.

6.How does Aetrix verify that GC15008-79 is sourced from the original manufacturer or authorized distributors?

All GC15008-79 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that GC15008-79 meets industry standards.

7.What is the process for return or replacement of GC15008-79?

All GC15008-79 units undergo pre-shipment inspection (PSI). If there is an issue with GC15008-79, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The GC15008-79 part is unused and in its original packaging.

Return procedure for GC15008-79:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…