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

Diodes Incorporated FMMV105GTA

Name: FMMV105GTA
Brand: Diodes Incorporated
SKU: FMMV105GTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMMV105GTA

Manufacturer:: Diodes Incorporated

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: FMMV105GTA.pdf

Description:: DIODE VARI CAP 30V 2.8PF SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,635

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Product details

Overview

FMMV105GTA from ON Semiconductor is a silicon planar variable capacitance diode (varactor) in SOT-23 package, designed for voltage-controlled tuning in RF circuits with 2.8 pF typical capacitance at 25 V, 6.0:1 capacitance ratio (3 V/25 V), and 350 typical Q-factor at 50 MHz - deployed in VCOs and FM modulators for wireless transceivers.

For engineers reviewing the FMMV105GTA datasheet, FMMV105GTA pinout, FMMV105GTA application, or FMMV105GTA equivalent, key selection criteria include reverse breakdown voltage (30 V), temperature coefficient (280 ppm/°C), series inductance (3.0 nH), tuning range linearity, and SOT-23 thermal dissipation capability (330 mW).

Technical Context

This varactor diode operates under reverse bias only, with capacitance controlled by applied DC voltage across its terminals. Its planar silicon structure ensures stable junction characteristics and low series inductance (3.0 nH at 250 MHz), critical for high-frequency tuning stability.

The device exhibits a defined capacitance–voltage relationship: 2.8 pF nominal at 25 V reverse bias, dropping to ~0.47–0.7 pF at 3 V, yielding a 4.0–6.0× capacitance ratio. Temperature coefficient is tightly specified at +280 ppm/°C, enabling predictable drift compensation in oscillator designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR	30 V minimum - sets maximum usable tuning voltage before avalanche conduction
C_d @ 25 V	2.8 pF typical - defines high-end frequency limit in VCO tank circuits
C_d Ratio	6.0 max (3 V/25 V) - determines achievable frequency tuning range in LC resonators
Q @ 50 MHz	350 typical - indicates low RF loss and high phase-noise performance in oscillators
TCC	+280 ppm/°C - quantifies capacitance drift per degree, critical for temperature-stable frequency references
P_tot	330 mW - limits power handling in bias networks and defines thermal derating above 25°C

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; moisture sensitivity level (MSL) 1, rated for reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	DC bias input / RF AC ground reference	Connected to fixed potential (e.g., V_CC or ground via RF choke); carries no forward current
2 (Cathode)	RF signal node / tuning voltage terminal	Applied reverse bias voltage modulates junction capacitance; must be isolated from DC paths in tank circuit
3 (Anode)	Secondary anode connection / thermal path	Electrically tied to Pin 1 internally; improves thermal dissipation and reduces parasitic inductance

Key Features

Feature	Design Value
Low series inductance	3.0 nH at 250 MHz - minimizes self-resonant frequency degradation in VHF/UHF tuning networks
High Q-factor	350 at 50 MHz - directly improves oscillator phase noise and tuning efficiency
Precision capacitance ratio	6.0:1 (3 V/25 V) - enables wideband frequency synthesis without switching capacitors
Stable temperature coefficient	+280 ppm/°C - allows first-order temperature compensation in fixed-VCO designs

Applications

Voltage-Controlled Oscillators (VCOs)

FM Modulators

Use Scenario: Tuning element in 88–108 MHz FM broadcast band VCOs for portable radios and IoT transmitters.

IC Role / Device Role / Timing Role: Voltage-variable capacitor forming part of LC resonator; capacitance change shifts oscillation frequency linearly with control voltage.

Use Value: 6.0:1 capacitance ratio enables >10% frequency deviation at 100 MHz with <5 V tuning range, supporting FCC-compliant modulation index.

Use Scenario: Direct FM modulation stage in low-power UHF ISM-band transmitters (e.g., 433 MHz remote controls).

IC Role / Device Role / Timing Role: Varactor biased by audio signal to impose instantaneous frequency deviation on carrier.

Use Value: 350 Q-factor at 50 MHz ensures minimal carrier distortion and sideband purity within ±75 kHz deviation limits.

Phase-Locked Loop Filters

RF Front-End Tuning

Use Scenario: Tuning capacitor in loop filter of PLL-based synthesizers for cellular baseband ICs.

IC Role / Device Role / Timing Role: Sets loop bandwidth and transient response via adjustable pole location in passive filter network.

Use Value: +280 ppm/°C TCC allows predictable loop bandwidth shift over –40°C to +85°C, reducing calibration overhead.

Use Scenario: Antenna impedance matching network tuning in 2.4 GHz Wi-Fi/BLE modules.

IC Role / Device Role / Timing Role: Adjustable shunt capacitance compensating for PCB trace and antenna manufacturing tolerances.

Use Value: 2.8 pF at 25 V provides fine-grained matching resolution (<0.1 dB return loss step) across production batches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMV1232-011LF	Higher C_d (3.5 pF @ 25 V), lower TCC (+150 ppm/°C), same SOT-23 package	Better suited for lower-frequency VCOs (<500 MHz) requiring higher tuning capacitance	Select when wider absolute capacitance range needed; verify Q-factor drop at target frequency
BBY52-02W	Lower C_d ratio (4.5:1), higher V_BR (35 V), TO-92 package	Used in legacy AM/FM radio tuners where leaded packaging and higher voltage margin are required	Choose only for through-hole assembly or systems needing >30 V tuning headroom

Compared with SMV1232-011LF and BBY52-02W, FMMV105GTA offers optimal balance of Q-factor (350), capacitance ratio (6.0:1), and SOT-23 thermal performance (330 mW) for modern surface-mount VCOs operating between 100 MHz and 2.4 GHz.

Availability

FMMV105GTA is available at Aetrix Electronics and suitable for voltage-controlled oscillators, FM modulators, PLL loop filters, and RF front-end impedance matching requiring stable component supply and consistent varactor performance across production lots.

Supply support for FMMV105GTA 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and communications markets.

FMMV105GTA belongs to ON Semiconductor's RF varactor diode product line, engineered specifically for high-Q, temperature-stable voltage tuning in compact wireless transceiver front-ends and frequency synthesis subsystems.

FAQ

What is the maximum recommended reverse bias voltage for FMMV105GTA?

The absolute maximum reverse breakdown voltage is 30 V at I_R = 10 µA. For reliable long-term operation, design should limit reverse bias to ≤25 V to maintain safe margin against process variation and temperature-induced drift. Exceeding 25 V risks accelerated junction degradation and increased leakage current beyond 10 nA specification.

Can FMMV105GTA be used in forward bias?

No - FMMV105GTA is strictly a reverse-biased varactor diode. Forward conduction is not characterized or guaranteed. Applying forward voltage causes uncontrolled current flow, irreversible junction heating, and permanent capacitance drift. Bias networks must ensure cathode remains at least 0.3 V more positive than anode under all operating conditions.

How does series inductance affect its use at 2.4 GHz?

At 2.4 GHz, the 3.0 nH series inductance introduces ~45 Ω reactance, degrading effective Q and limiting usable tuning range. For 2.4 GHz applications, operate below 25 V reverse bias to keep C_d ≥1.2 pF, ensuring self-resonant frequency remains >3 GHz. Layout must minimize trace inductance to avoid compounding this effect.

Is SPICE model availability confirmed for FMMV105GTA?

Yes - ON Semiconductor confirms SPICE parameter data is available upon request for FMMV105GTA. The model includes junction capacitance voltage dependence, series resistance, and package parasitics calibrated to measured C–V and Q–f curves. Contact ON Semiconductor's technical support with orderable part number to obtain the validated .lib file.

FMMV105GTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 2.8pF @ 25V, 1MHz

Capacitance Ratio:: 6.0

Capacitance Ratio Condition:: C3/C25

Voltage - Peak Reverse (Max):: 30 V

Diode Type:: Single

Q @ Vr, F:: 350 @ 3V, 50MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

FMMV105GTA FAQ

1.How can I place an order for FMMV105GTA through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMV105GTA 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 FMMV105GTA reliable?

The price and inventory of FMMV105GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMV105GTA is usually 5 days.

3.What payment methods are accepted for FMMV105GTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMV105GTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMV105GTA?

FMMV105GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMV105GTA 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 FMMV105GTA?

For technical support, including FMMV105GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMV105GTA requirements.

6.How does Aetrix verify that FMMV105GTA is sourced from the original manufacturer or authorized distributors?

All FMMV105GTA 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 FMMV105GTA meets industry standards.

7.What is the process for return or replacement of FMMV105GTA?

All FMMV105GTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMV105GTA, 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 FMMV105GTA part is unused and in its original packaging.

Return procedure for FMMV105GTA:

1.Submit a request within 90 days.

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

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