SMV1253-079LF

Overview

The SMV1253-079LF is a silicon hyperabrupt junction tuning varactor diode from the Skyworks SMV1247-SMV1255 series, housed in an SC-79 package with a typical series inductance of 0.7 nH. It features a nominal capacitance of 53 pF at 0.3 V reverse bias and 4.8 pF at 4.7 V. The device supports a maximum reverse voltage of 15 V and operates within a temperature range of -55 °C to +125 °C. Key electrical characteristics include a typical capacitance ratio of 12.3 (at 1 V/3 V) and a series resistance of 1.1 Ω at 500 MHz.

Feature Summary

• Hyperabrupt junction design optimized for low tuning voltage Voltage Controlled Oscillator (VCO) applications
• High capacitance ratio providing efficient frequency tuning across the operating voltage range
• Moisture Sensitivity Level 1 (MSL1) rated for 260 °C lead-free soldering processes

Applications

• Low tuning voltage Voltage Controlled Oscillators (VCOs)
• High-volume commercial RF systems
• Electronically tunable filters and matching networks

Procurement Notes

Verify component authenticity by checking the marking code 'Cathode and GH' against official Skyworks documentation. Confirm the SC-79 package outline and ensure the part number suffix LF indicates RoHS compliance. Review the datasheet for absolute maximum ratings to prevent damage during handling or assembly.

Selection Notes

Select this component when a high nominal capacitance near 53 pF is required for low-frequency tuning ranges. The SC-79 package offers a specific footprint distinct from SOD-323 or SOT-23 alternatives. Ensure the circuit design accommodates the 0.7 nH series inductance inherent to this package type for accurate RF performance modeling.

Part Context

This part belongs to the SMV1247-SMV1255 family of silicon hyperabrupt varactors designed for commercial RF applications. The SMV1253 variant provides higher capacitance values compared to lower-numbered siblings like the SMV1247, making it suitable for different oscillator bandwidth requirements within the same product line.

Replacement Considerations

SMV1253-040LF: Identical electrical specifications but utilizes an SOD-882 package instead of SC-79.