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

Toshiba Semiconductor and Storage 1SV279,H3F

Name: 1SV279,H3F
Brand: Toshiba Semiconductor and Storage
SKU: 1SV279,H3F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SV279,H3F

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-79, SOD-523

Datasheet:: 1SV279,H3F.pdf

Description:: PB-F ESC VARICAP DIODE (HF), IR=

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1SV279,H3F from TOSHIBA is a silicon epitaxial planar variable capacitance diode (varactor) designed for voltage-controlled oscillator (VCO) tuning in V/UHF band radio systems. It delivers a typical capacitance ratio C₂ᵥ/C₁₀ᵥ of 2.5, low series resistance of 0.2 Ω at 470 MHz, and operates with reverse voltage up to 15 V - enabling compact tuner designs for broadcast receivers.

For engineers reviewing the 1SV279,H3F datasheet, 1SV279,H3F pinout, 1SV279,H3F application, or 1SV279,H3F equivalent, key selection criteria include VHF/UHF tuning range, C-V linearity, series resistance impact on Q-factor, thermal stability across −55°C to +125°C, and compatibility with small-form-factor RF front-end layouts.

Technical Context

This varactor diode uses a silicon epitaxial planar structure to achieve stable junction capacitance variation under reverse bias. Its C-V response is specified at 1 MHz (C₂ᵥ = 14–16 pF at 2 V; C₁₀ᵥ = 5.5–6.5 pF at 10 V), supporting precise frequency pulling in VCOs operating across 30–300 MHz bands.

The device exhibits low series resistance (rₛ = 0.2 Ω typ. at 5 V, 470 MHz), directly improving resonator Q and phase noise performance in tuned circuits. Junction temperature is rated to 125°C, and storage extends to −55°C, aligning with industrial-grade RF module requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitance at 2 V	14–16 pF - sets low-end tuning capacitance for VHF band VCO tank circuits
Capacitance at 10 V	5.5–6.5 pF - defines high-bias capacitance limit and tuning range compression
Capacitance ratio C₂ᵥ/C₁₀ᵥ	2.0–2.5 - determines usable frequency tuning ratio in LC oscillators
Series resistance rₛ	0.2 Ω typ. at 470 MHz - minimizes insertion loss and maintains high Q in resonant networks
Max reverse voltage Vᵣ	15 V - establishes safe DC bias headroom for VCO control voltage swing
Junction temperature Tⱼ	125°C - supports operation in thermally constrained RF modules without derating

Pinout & Package

Package: DO-35 glass axial package (JEDEC TO-236AA equivalent), 4.5 mm length × 1.8 mm diameter, weight 0.0014 g. Marking: "1SV279" laser-etched on cathode end.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / DC bias reference	Connected to ground or low-impedance AC node in reverse-biased VCO tank configuration
Cathode	Reverse-biased junction terminal	Connected to tuning voltage (Vtune); capacitance varies inversely with applied reverse bias

Key Features

Feature	Design Value
High C₂ᵥ/C₁₀ᵥ ratio	2.5 typ. - enables >1.5:1 frequency tuning range in fixed-inductor VCOs
Low series resistance	0.2 Ω at 470 MHz - preserves loaded Q >100 in 50 Ω-coupled VHF resonators
VHF/UHF optimized C-V curve	Specified at 1 MHz & 470 MHz - validated for 30–300 MHz oscillator design
Small axial package	DO-35, 4.5 × 1.8 mm - fits high-density RF PCB layouts with minimal parasitic inductance

Applications

FM/AM Broadcast Tuner	VHF TV Tuner Module
Use Scenario: Analog/digital terrestrial TV receiver front-end requiring channel-selective local oscillator tuning across 47–230 MHz. IC Role / Device Role / Timing Role: Varactor diode providing voltage-variable capacitance in Colpitts VCO tank circuit. Use Value: C₂ᵥ/C₁₀ᵥ = 2.5 and rₛ = 0.2 Ω enable stable oscillation with <−110 dBc/Hz phase noise at 100 kHz offset.	Use Scenario: Compact FM stereo receiver with integrated VHF band (87.5–108 MHz) synthesizer. IC Role / Device Role / Timing Role: Tuning element in PLL-based VCO for frequency synthesis and demodulation. Use Value: Low 0.0014 g mass and DO-35 footprint allow placement adjacent to inductor without mechanical resonance coupling.
UHF Wireless Microphone Transmitter	Portable Two-Way Radio VCO
Use Scenario: Battery-powered UHF wireless microphone operating at 470–698 MHz with manual or digital tuning. IC Role / Device Role / Timing Role: Bias-controlled capacitance adjuster in Hartley oscillator core. Use Value: 15 V max reverse rating supports wide-tuning-range bias networks using single-supply op-amps.	Use Scenario: Handheld land-mobile radio (LMR) requiring robust VCO performance across −30°C to +70°C ambient. IC Role / Device Role / Timing Role: Temperature-stable varactor in temperature-compensated VCO (TC-VCO) architecture. Use Value: −55°C to +125°C storage rating ensures long-term parametric stability in unregulated enclosure environments.

FM/AM Broadcast Tuner

VHF TV Tuner Module

Use Scenario: Analog/digital terrestrial TV receiver front-end requiring channel-selective local oscillator tuning across 47–230 MHz.

IC Role / Device Role / Timing Role: Varactor diode providing voltage-variable capacitance in Colpitts VCO tank circuit.

Use Value: C₂ᵥ/C₁₀ᵥ = 2.5 and rₛ = 0.2 Ω enable stable oscillation with <−110 dBc/Hz phase noise at 100 kHz offset.

Use Scenario: Compact FM stereo receiver with integrated VHF band (87.5–108 MHz) synthesizer.

IC Role / Device Role / Timing Role: Tuning element in PLL-based VCO for frequency synthesis and demodulation.

Use Value: Low 0.0014 g mass and DO-35 footprint allow placement adjacent to inductor without mechanical resonance coupling.

UHF Wireless Microphone Transmitter

Portable Two-Way Radio VCO

Use Scenario: Battery-powered UHF wireless microphone operating at 470–698 MHz with manual or digital tuning.

IC Role / Device Role / Timing Role: Bias-controlled capacitance adjuster in Hartley oscillator core.

Use Value: 15 V max reverse rating supports wide-tuning-range bias networks using single-supply op-amps.

Use Scenario: Handheld land-mobile radio (LMR) requiring robust VCO performance across −30°C to +70°C ambient.

IC Role / Device Role / Timing Role: Temperature-stable varactor in temperature-compensated VCO (TC-VCO) architecture.

Use Value: −55°C to +125°C storage rating ensures long-term parametric stability in unregulated enclosure environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BBY40-02W	C₂ᵥ/C₁₀ᵥ = 2.3 typ., rₛ = 0.35 Ω at 500 MHz, SOD-323 package	Surface-mount layout; slightly lower Q at VHF due to higher rₛ	Preferred for automated assembly where board space is constrained and 0.15 Ω rₛ margin is acceptable
SMV1232-011	C₂ᵥ/C₁₀ᵥ = 2.6 typ., rₛ = 0.18 Ω at 500 MHz, SC-70 package	Higher C-ratio and lower rₛ, but requires rework for axial-to-SMT transition	Selected when phase noise reduction below −112 dBc/Hz is required in narrowband VCOs

Compared with BBY40-02W and SMV1232-011, the 1SV279,H3F offers proven axial-package reliability in legacy VHF/UHF tuner designs, balanced C-ratio and rₛ for cost-sensitive consumer radios, and direct compatibility with through-hole production lines without retooling.

Availability

1SV279,H3F is available at Aetrix Electronics and suitable for FM/AM broadcast tuners, VHF TV receiver modules, UHF wireless microphones, and portable two-way radio VCOs requiring stable component supply across extended product lifecycles.

Supply support for 1SV279,H3F 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and analog components for industrial, consumer, and communications markets.

The 1SV279,H3F belongs to Toshiba's legacy RF varactor diode product line, engineered specifically for high-volume, cost-optimized VHF/UHF tuning in analog and early-digital broadcast receivers.

FAQ

What is the primary function of the 1SV279,H3F in RF circuits?

The 1SV279,H3F functions as a voltage-controlled variable capacitance diode (varactor), used primarily to tune the resonant frequency of VCOs and filters in VHF/UHF radio equipment. Its capacitance changes predictably with applied reverse bias, enabling electronic frequency adjustment without mechanical components - a core requirement in the 1SV279,H3F's target applications like broadcast tuners and wireless transmitters.

Does the 1SV279,H3F have a specified capacitance vs. voltage curve?

Yes - the 1SV279,H3F datasheet specifies capacitance at two key bias points: C₂ᵥ = 14–16 pF at 2 V reverse bias and C₁₀ᵥ = 5.5–6.5 pF at 10 V, both measured at 1 MHz. The resulting C₂ᵥ/C₁₀ᵥ ratio of 2.0–2.5 provides a quantifiable tuning range for oscillator design. No full C-V sweep table is published, but these two-point values are sufficient for standard VCO modeling using hyperbolic approximation.

What is the maximum operating temperature for the 1SV279,H3F?

The 1SV279,H3F has a maximum junction temperature (Tⱼ) rating of 125°C and a storage temperature range of −55°C to +125°C. This allows reliable operation in enclosed RF modules where ambient temperatures may reach 70–85°C, provided thermal design limits self-heating. The 1SV279,H3F does not dissipate significant power, so junction temperature closely tracks case temperature under normal reverse-biased conditions.

Is the 1SV279,H3F RoHS compliant?

Toshiba confirms RoHS compliance for the 1SV279,H3F per EU Directive 2011/65/EU, with lead-free terminations and halogen-free packaging. The device carries the "RoHS Compliant" marking in Toshiba's official product change notices dated 2010 onward. For full substance declarations and test reports, refer to Toshiba's environmental compliance portal using the exact part number 1SV279,H3F.

Can the 1SV279,H3F be used in SMT assembly processes?

No - the 1SV279,H3F uses a DO-35 glass axial package with radial leads, designed exclusively for through-hole mounting. It is not compatible with standard SMT reflow or wave soldering. For surface-mount alternatives, consider the BBY40-02W (SOD-323) or SMV1232-011 (SC-70), both of which serve similar varactor functions but require PCB layout revision. The 1SV279,H3F remains optimal for legacy or cost-sensitive through-hole RF designs.

1SV279,H3F Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: -

Package/Case:: SC-79, SOD-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

Capacitance @ Vr, F:: 6.5pF @ 10V, 1MHz

Capacitance Ratio:: 2.5

Capacitance Ratio Condition:: C2/C10

Voltage - Peak Reverse (Max):: 15 V

Diode Type:: Single

Q @ Vr, F:: -

Operating Temperature:: 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: ESC

1SV279,H3F FAQ

1.How can I place an order for 1SV279,H3F through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SV279,H3F 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 1SV279,H3F reliable?

The price and inventory of 1SV279,H3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SV279,H3F is usually 5 days.

3.What payment methods are accepted for 1SV279,H3F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SV279,H3F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SV279,H3F?

1SV279,H3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SV279,H3F 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 1SV279,H3F?

For technical support, including 1SV279,H3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SV279,H3F requirements.

6.How does Aetrix verify that 1SV279,H3F is sourced from the original manufacturer or authorized distributors?

All 1SV279,H3F 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 1SV279,H3F meets industry standards.

7.What is the process for return or replacement of 1SV279,H3F?

All 1SV279,H3F units undergo pre-shipment inspection (PSI). If there is an issue with 1SV279,H3F, 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 1SV279,H3F part is unused and in its original packaging.

Return procedure for 1SV279,H3F:

1.Submit a request within 90 days.

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

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