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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：6pF @ 4V, 1MHz
- Capacitance Ratio：3
- Capacitance Ratio Condition：C1/C4
- Voltage - Peak Reverse (Max)：15 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 SMV1272-079LF 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 TV tuners and low phase-noise voltage-controlled oscillators (VCOs) for GSM, PCS, CDMA, and analog phones. The device features a maximum reverse voltage of 15 V, a forward current rating of 20 mA, and power dissipation of 250 mW. Electrical specifications include a typical capacitance of 16.62 pF at 1 V reverse bias and 6.0 pF at 4 V, yielding a capacitance ratio of 3.0. Series resistance is typically 0.5 Ω at 470 MHz with 1 V reverse bias. The component is housed in an ultra-small SC-79 package.
Feature Summary
- Cross-compatible with Renesas HVC350B
- Low-series resistance for improved performance
- High-capacitance ratio suitable for wideband applications
- Ultra-small SC-79 surface-mount package
Applications
- VHF TV tuners
- Low phase-noise voltage-controlled oscillators (VCOs)
- Wideband UHF and VCOs for GSM, PCS, CDMA, and analog phones
Procurement Notes
Verify the specific ordering suffix against official Skyworks documentation to ensure correct packaging and lead-free compliance. Confirm Moisture Sensitivity Level 1 (MSL1) ratings and JEDEC J-STD-020 soldering limits before assembly. Check for recent Product Change Notifications or End-of-Life notices to ensure long-term availability and design continuity.
Selection Notes
Select this component when designing circuits requiring high capacitance ratios and low series resistance for frequencies exceeding 2.5 GHz. Ensure the operating environment stays within the -55 °C to +125 °C temperature range. Verify that the required reverse voltage does not exceed the 15 V absolute maximum rating to maintain device reliability.
Part Context
This part belongs to the SMV1272 series of hyperabrupt junction tuning varactors manufactured by Skyworks Solutions. It is specifically engineered for battery-powered wireless communication devices. The device utilizes a Green™ lead-free, RoHS-compliant package marked with 'Y4' and a cathode indicator.
Replacement Considerations
The datasheet explicitly states cross-compatibility with the Renesas HVC350B. Verify pinout alignment and electrical parameter tolerances before substitution.
FAQ
What is the typical capacitance ratio of the SMV1272-079LF?
The typical capacitance ratio (CT @ 1 V / CT @ 4 V) is 3.0.
What is the maximum reverse voltage rating for this varactor?
The absolute maximum reverse voltage rating is 15 V.
Is the SMV1272-079LF compatible with lead-free soldering processes?
Yes, it is rated for MSL1 and can be used for lead or lead-free soldering up to 260 °C per JEDEC J-STD-020.
