Microchip Technology GC15003-00

Overview

GC15003-00 from Microsemi is a frequency-linear tuning varactor diode designed for wideband VCO and filter applications in Ku-band systems. It delivers 2.0 pF capacitance at −4 V, 0.55 pF at −20 V, 8:1 tuning ratio (C_J0/C_J20), Q = 1200 at 4 V/50 MHz, and sensitivity S = 0.08, enabling octave-spanning linear tuning without external compensation.

For engineers reviewing the GC15003-00 datasheet, GC15003-00 pinout, GC15003-00 application, or GC15003-00 equivalent, key selection criteria include its guaranteed C-V linearity across −2 to −20 V bias, low surface noise for FM-noise-sensitive VCOs, high Q at RF frequencies, RoHS-compliant gold-plated terminals, and suitability for hybrid or surface-mount carrier mounting per Package Style 00 or 17.

Technical Context

The GC15003-00 employs computer-controlled grown junction epitaxy to achieve precise doping profiles that yield near-ideal hyperabrupt C-V characteristics with constant sensitivity (S = 0.08) over its full tuning range. Its mesa structure and superior passivation ensure low leakage (<50 nA @ 20 V) and stable performance from −55 °C to +125 °C.

This varactor operates as a voltage-controlled capacitor in resonant circuits, where its linear C-V response directly translates to linear frequency tuning in VCOs-enabling >1-octave bandwidth in Ku-band (12–18 GHz) without active linearization circuitry. Its high Q minimizes insertion loss and phase noise degradation in filter and oscillator tank networks.

Key Specifications

Pinout & Package

GC15003-00 is supplied as a bare die (chip) in Package Style 00 for hybrid circuit integration, or in hermetic stripline surface-mount Package Style 17. No discrete pinout applies: it is a two-terminal device with anode and cathode terminals defined by chip orientation and metallization pattern per Microsemi's GC15000 series mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GC15002-00 and GC15004-00, the GC15003-00 provides optimal balance of capacitance (2.0 pF), Q (1200), and tuning linearity for mid-Ku-band VCOs (13–16 GHz), avoiding the high-frequency limitation of GC15002-00 and the reduced upper-frequency headroom of GC15004-00.

Availability

GC15003-00 is available at Aetrix Electronics and suitable for phased-array radar transceivers, satellite communication modems, and electronic warfare receiver front-ends requiring stable component supply across extended temperature ranges and high-reliability assembly.

Supply support for GC15003-00 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 to deliver frequency-linear tuning varactors for Ku-band VCOs and filters where octave-spanning linearity, low phase noise, and high Q are mandatory-not just desirable.

FAQ

What is the maximum reverse bias voltage rating for GC15003-00?

The GC15003-00 has no specified maximum reverse bias voltage beyond the Absolute Maximum Rating of 20 V. However, its C-V curve is characterized up to −20 V, and operation above this voltage risks exceeding leakage current limits (50 nA) or degrading linearity. For reliable long-term use, bias should be kept within 0 to −20 V, with −20 V used only for maximum frequency tuning.

Does GC15003-00 require external linearization circuitry in VCO designs?

No. The GC15003-00 features intrinsic frequency-linear tuning with constant sensitivity (S = 0.08), enabling true octave-spanning linear frequency vs. voltage response in properly designed VCO tank circuits. External linearization is unnecessary unless system-level nonlinearities (e.g., inductor saturation) dominate.

What package options are available for GC15003-00?

The GC15003-00 is offered in Package Style 00 (bare die for hybrid circuits) and Package Style 17 (hermetic stripline surface-mount). Package Style 450A/B is not listed for this variant. Mounting on carriers is supported, but standard plastic packages are discouraged due to parasitic capacitance compromising C-V linearity at high bias.

How does GC15003-00 compare to ion-implanted hyperabrupt varactors in phase noise performance?

The GC15003-00 achieves lower FM noise than ion-implanted hyperabrupt diodes due to its epitaxial mesa structure and superior passivation, which reduce surface trap-related noise. Its Q of 1200 at 4 V/50 MHz and low surface noise directly translate to up to 3 dB lower integrated phase noise in VCO applications, especially under modulation.

Is GC15003-00 RoHS compliant and what is its terminal finish?

Yes, GC15003-00 meets RoHS Directive 2002/95/EC. Its standard terminal finish is gold, ensuring compatibility with lead-free reflow processes and preventing intermetallic formation in hybrid assemblies. Alternate finishes are available upon factory consultation.