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Product Detailed Parameters
- Description：IC TUNING VARACTOR SOT23
- Series：-
- Mfr：Skyworks Solutions Inc.
- Package：Bulk
- Capacitance @ Vr, F：3.8pF @ 4.7V, 50MHz
- Capacitance Ratio：12.2
- Capacitance Ratio Condition：C0.3/C4.7
- Voltage - Peak Reverse (Max)：15 V
- Diode Type：Single
- Q @ Vr, F：400 @ 3V, 50MHz
- Operating Temperature：-55°C ~ 125°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Package / Case：SC-76, SOD-323
- Supplier Device Package：SOD-323
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Overview
The SMV1251-011LF is a silicon hyperabrupt junction varactor diode designed for low tuning voltage Voltage Controlled Oscillators (VCOs). It features a typical capacitance ratio of 12 from 0.3 V to 4.7 V and operates within a reverse voltage range up to 15 V. The device is housed in an SOD-323 package with a series inductance of 1.5 nH. Electrical specifications include a minimum Q factor of 400 at 3 V and 50 MHz, and a maximum series resistance of 1.6 Ω at 3 V and 500 MHz.
Feature Summary
- Hyperabrupt junction design optimized for high capacitance ratios in low voltage applications
- SOD-323 surface mount package rated for Moisture Sensitivity Level 1
- Characterized for capacitance and resistance over temperature ranges
Applications
- Low tuning voltage Voltage Controlled Oscillators (VCOs)
- High-volume commercial RF systems
- Electronically tunable filters and matching networks
Procurement Notes
Verify the specific ordering suffix against official Skyworks documentation to confirm lead-free compliance and package marking details. Confirm current availability status as product lifecycles may change without notice. Ensure ESD handling precautions are followed during storage and assembly to prevent damage.
Selection Notes
Select this component when a higher nominal capacitance than the SMV1249 is required for VCO tuning circuits. Verify that the 1.5 nH series inductance of the SOD-323 package aligns with the target frequency response. Compare the 400 Q factor specification against circuit requirements for phase noise performance.
Part Context
This part belongs to the SMV1247-SMV1255 series of silicon hyperabrupt junction varactors. The series provides a range of capacitance values tailored for battery-operated circuits requiring low tuning voltages. The SMV1251 variant specifically offers higher capacitance levels compared to lower-numbered parts in the same family.
Replacement Considerations
No direct public substitute part numbers are confirmed in the provided datasheet. Designers should evaluate other SKY12xxx or SKY1xx series varactors based on capacitance and package compatibility if discontinuation occurs.
FAQ
What is the typical capacitance ratio for the SMV1251-011LF?
The typical capacitance ratio (C0.3V/C4.7V) is 12.
What package type does the SMV1251-011LF use?
It uses the SOD-323 package with a series inductance of 1.5 nH.
What is the minimum Q factor specified for this device?
The minimum Q factor is 400 at 3 V and 50 MHz.
