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Product Detailed Parameters
- Description：DIODE VARACTOR
- Series：-
- Mfr：Skyworks Solutions Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Capacitance @ Vr, F：2.35pF @ 4V, 1MHz
- Capacitance Ratio：2
- Capacitance Ratio Condition：C1/C4
- Voltage - Peak Reverse (Max)：10 V
- Diode Type：Single
- Q @ Vr, F：-
- Operating Temperature：-55°C ~ 125°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Package / Case：SC-79, SOD-523
- Supplier Device Package：SC-79
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Overview
The SMV1276-079LF is a silicon hyperabrupt junction tuning varactor diode designed for battery-operated wireless systems. It operates at frequencies up to and above 2.5 GHz, including VHF and UHF bands. The device features a maximum reverse voltage of 10 V and a forward current rating of 20 mA. At 1 MHz with 1 V reverse bias, the typical capacitance is 4.32 pF, dropping to 2.03 pF at 4 V. The series resistance is typically 0.7 Ω at 470 MHz. It utilizes an SC-79 surface-mount package with a parasitic inductance of 0.7 nH.
Feature Summary
- Cross-compatible with Toshiba 1SV285
- Low-series resistance for improved performance
- High-capacitance ratio suitable for wideband applications
- Ultra-small SC-79 package optimized for space-constrained designs
Applications
- VHF TV tuners
- Low-noise and wideband UHF and VHF VCOs
- Voltage-controlled oscillators (VCOs) for GSM, PCS, CDMA, and analog phones
Procurement Notes
Verify component authenticity through authorized Skyworks distributors or official channels. Confirm RoHS compliance and lead-free status via the datasheet. Ensure ESD precautions are strictly followed during handling and assembly. Check moisture sensitivity level requirements before soldering to prevent damage.
Selection Notes
Select this component for low phase-noise VCO designs operating above 2.5 GHz. The high capacitance ratio supports wide tuning ranges in wireless communication systems. Verify that the 10 V reverse voltage limit meets circuit requirements. Consider the SC-79 footprint for compact PCB layouts.
Part Context
The SMV1276-079LF belongs to Skyworks' hyperabrupt junction varactor family. It is specifically engineered for battery-powered wireless devices requiring stable frequency control. The device complements other SMV series components by offering a balance of low series resistance and high capacitance variation.
Replacement Considerations
The datasheet explicitly states cross-compatibility with the Toshiba 1SV285. Verify pinout and electrical parameters match before substitution. No other direct replacements are documented in the provided source material.
FAQ
What is the typical capacitance ratio of the SMV1276-079LF?
The typical capacitance ratio (CT @ 1 V / CT @ 4 V) is 2.0.
Is the SMV1276-079LF suitable for lead-free soldering?
Yes, it is rated for Moisture Sensitivity Level 1 (MSL1) at 260 °C and can be used for lead or lead-free soldering.
What is the maximum reverse voltage rating?
The absolute maximum reverse voltage rating is 10 V.
