Microchip Technology GC1213-23-0

Overview

GC1213-23-0 from Microsemi is a silicon abrupt-junction varactor diode in SOT-23 package, optimized for voltage-controlled oscillators (VCOs) requiring low phase noise and high Q. It delivers 10.0 pF capacitance at 4 V (±10%), 4.1:1 capacitance ratio (CT(0V)/CT(−30V)), minimum Q of 1800 at 50 MHz/4 V, and maximum working voltage of 30 V. Used in HF–1500 MHz tuning circuits for RF front-ends and synthesizers.

For engineers reviewing the GC1213-23-0 datasheet, GC1213-23-0 pinout, GC1213-23-0 application, or GC1213-23-0 equivalent, key selection criteria include its 10 pF nominal tuning range, 1800 minimum Q at 50 MHz, −55°C to +125°C operating temperature, RoHS-compliant gold-terminated SOT-23 package, and suitability for low-phase-noise VCOs and voltage-variable filters.

Technical Context

The GC1213-23-0 employs an abrupt junction silicon structure to maximize Q and minimize series resistance (RS), enabling superior performance in narrow-to-moderate bandwidth tuning applications. Its capacitance is specified at 1 MHz, and Q is measured at 4 V reverse bias and 50 MHz using the standard formula Q = 1/(2πf·RS·CJ).

Designed for RF signal path tuning, it supports voltage-variable reactance control in oscillator tank circuits and filter resonators. Thermal coefficient of capacitance is +300 ppm/°C at 4 V, and leakage current remains ≤0.02 µA at 25°C under 25 V reverse bias.

Key Specifications

Pinout & Package

SOT-23 surface-mount package with single-diode configuration (cathode-anode-cathode pinout). Gold-plated terminations ensure RoHS-compliant reflow assembly and low contact resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MA46H120 and BBY58-02W, GC1213-23-0 offers the highest Q (1800) and widest temperature range (−55°C to +125°C) in the 10 pF class, making it preferred for low-phase-noise, high-reliability VCOs in industrial and aerospace RF systems.

Availability

GC1213-23-0 is available at Aetrix Electronics and suitable for RF synthesizers, voltage-controlled oscillators, and tunable filter modules requiring stable component supply across industrial, defense, and communications programs.

Supply support for GC1213-23-0 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 GCX1200–23 series was designed specifically for low-phase-noise RF tuning applications, emphasizing high Q, abrupt junction linearity, and robust SOT-23 packaging for commercial and extended-temperature deployment.

FAQ

What is the nominal capacitance of GC1213-23-0 and at what test condition is it specified?

The nominal capacitance of GC1213-23-0 is 10.0 pF, measured at 1 MHz and 4 V reverse bias with ±10% tolerance. This value defines its primary tuning range in VCO and filter applications and is validated per Microsemi's characterization methodology on Page 2 of the GCX1202–GCX1217 datasheet.

Does GC1213-23-0 have a specified Q factor, and how is it measured?

Yes, GC1213-23-0 has a minimum Q of 1800, measured at 50 MHz and 4 V reverse bias using the standard formula Q = 1/(2πf·RS·CJ). This Q value reflects its low-loss performance in resonant circuits and is critical for minimizing phase noise in voltage-controlled oscillators using GC1213-23-0.

What is the maximum reverse voltage rating for GC1213-23-0, and what happens above that level?

The maximum working voltage for GC1213-23-0 is 30 V DC. Exceeding this rating risks irreversible junction breakdown, increased leakage current (>0.02 µA at 25°C), and permanent degradation of Q and capacitance linearity. Designers must limit tuning voltage to ≤30 V with appropriate clamping or regulation when using GC1213-23-0.

Is GC1213-23-0 RoHS compliant, and what plating is used on its terminals?

Yes, GC1213-23-0 is RoHS compliant per EU Directive 2002/95/EC. Its SOT-23 terminals feature gold plating, which ensures compatibility with lead-free reflow soldering processes and prevents intermetallic formation during assembly - a key reliability requirement confirmed in Microsemi's GCX1202–GCX1217 documentation.

What is the capacitance ratio (CT(0V)/CT(−30V)) for GC1213-23-0, and why does it matter?

The capacitance ratio for GC1213-23-0 is 4.1:1, meaning its zero-volt capacitance is 4.1 times larger than its capacitance at −30 V. This ratio determines the usable frequency tuning range in LC oscillators and filters; a higher ratio enables broader, more linear frequency sweeps without mode-hopping - a key advantage of GC1213-23-0 in synthesizer designs.