Microchip Technology GC15007-127A

Overview

GC15007-127A from Microsemi is a frequency-linear tuning varactor diode designed for high-performance VCO and filter tuning in Ku-band RF systems. It delivers 1.0 pF capacitance at −4 V, 0.2 pF at −20 V, 13:1 tuning ratio (C_J0/C_J20), 0.11 sensitivity, and typical Q of 1000 at 4 V/50 MHz - enabling octave-wide linear tuning without external compensation in satellite transceivers.

For engineers reviewing the GC15007-127A datasheet, GC15007-127A pinout, GC15007-127A application, or GC15007-127A equivalent, this part supports low-FM-noise VCO design, high-modulation-rate tuning, and RoHS-compliant microwave assembly where bias-dependent C-V linearity and high Q are critical selection criteria.

Technical Context

This FLTVAR™ device uses computer-controlled grown junction epitaxy to achieve precise doping profiles that yield near-constant voltage-to-capacitance sensitivity (S = 0.11) across its −2 V to −20 V tuning range. Its mesa silicon structure provides low surface noise and superior passivation for stable operation up to +125 °C.

The diode operates with reverse-bias only, exhibits ≤50 nA leakage at 20 V, and maintains functional performance through Ku band (12–18 GHz). Its C-V linearity eliminates need for external linearization circuitry in wideband VCOs and tunable filters.

Key Specifications

Pinout & Package

GC15007-127A is supplied in Package Style 127A: hermetic stripline surface-mount package optimized for microwave hybrid assemblies. Dimensions and terminal layout conform to Microsemi's standard 127A mechanical drawing for FLTVAR™ series.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with GC15007-127A, GC15007-17 offers identical RF performance in a non-SMT hybrid format, while MAVR-000127-127A trades Q and temperature rating for lower unit cost - making GC15007-127A optimal for Ku-band aerospace VCOs demanding both linearity and ruggedness.

Availability

GC15007-127A is available at Aetrix Electronics and suitable for phased-array radar, satellite communications, and test instrumentation requiring stable component supply, traceable lot control, and long-lifecycle support.

Supply support for GC15007-127A 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 and RF components for aerospace, defense, and industrial markets.

The GC15000 series was developed specifically for Ku-band frequency-linear tuning in mission-critical VCOs and filters, emphasizing low phase noise, high Q, and process-controlled C-V linearity.

FAQ

What is the maximum reverse voltage rating for GC15007-127A?

The absolute maximum reverse bias voltage for GC15007-127A is 22 V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks junction breakdown and permanent degradation of C-V linearity and Q performance. For reliable long-term use in VCO designs, Microsemi recommends limiting bias to ≤20 V, where leakage remains ≤50 nA and tuning stability is maintained.

Does GC15007-127A require special handling due to ESD sensitivity?

Yes, GC15007-127A is an ESD-sensitive device per Microsemi's documentation. It must be handled using Class 1A ESD precautions - including grounded workstations, ionized air, and conductive packaging - to prevent latent damage to the epitaxial mesa junction. Field failures from undetected ESD events include increased leakage current and degraded Q, especially noticeable in low-phase-noise VCO applications using GC15007-127A.

Is GC15007-127A RoHS compliant and what is its terminal finish?

Yes, GC15007-127A is RoHS compliant per EU Directive 2002/95/EC. Its standard terminal finish is pure gold, which ensures compatibility with lead-free reflow soldering and long-term corrosion resistance in humid or high-vibration environments. This finish is integral to the 127A package construction and does not require additional plating or specification override.

How does the 0.11 sensitivity value impact VCO design using GC15007-127A?

The sensitivity S = 0.11 means GC15007-127A delivers near-constant ∆C/∆V across its tuning range, resulting in linear ∆f/∆V response in VCOs. This eliminates the need for op-amp-based linearization circuits or lookup-table compensation, simplifying PCB layout and improving modulation fidelity - especially critical in GC15007-127A-based modulated VCOs for data links and radar.

Can GC15007-127A be used in place of GC15007-00 in hybrid circuits?

No - GC15007-00 is a bare die intended for die-bonding in custom hybrid assemblies, while GC15007-127A is a fully packaged, surface-mount component with defined mechanical footprint and thermal path. Substituting them requires redesigning mounting, grounding, and RF layout. GC15007-127A is not a drop-in replacement for GC15007-00; use GC15007-17 instead if hermetic stripline packaging is needed with hybrid integration.