SMV1251-040LF

Overview

The SMV1251-040LF is a silicon hyperabrupt junction tuning varactor diode from the Skyworks SMV1247-SMV1255 series, designed for low tuning voltage Voltage Controlled Oscillator (VCO) applications. It utilizes an SMD/SMT SC-79 package with a single configuration and a typical series inductance of 0.7 nH. The device operates within a temperature range of -55°C to +125°C and supports a maximum reverse voltage of 15 V and forward current of 20 mA. At 0.3 V, the capacitance ranges from 38.0 pF to 42 pF, while at 4.7 V it ranges from 28.1 pF to 38.0 pF. The typical capacitance ratio (C0.3V/C4.7V) is 12, with a series resistance of 4.8 Ω at 3 V and 500 MHz.

Feature Summary

• Hyperabrupt junction design optimized for high capacitance ratio and low tuning voltage operation
• Characterized for capacitance and resistance performance over a wide temperature range
• Moisture Sensitivity Level 1 rated for lead-free soldering up to 260 °C

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 cross-referencing the manufacturer marking EH1 on the SC-79 package against official Skyworks documentation. Confirm RoHS compliance status via the manufacturer's Certificate of Conformance prior to integration. Ensure handling procedures strictly follow ESD protection guidelines to prevent damage during assembly.

Selection Notes

Select this component when a higher baseline capacitance than the SMV1247 or SMV1248 is required for specific VCO frequency bands. The SC-79 package offers a compact footprint suitable for space-constrained designs. Evaluate the 4.8 Ω series resistance at 500 MHz against system phase noise requirements.

Part Context

This part belongs to the SMV1247-SMV1255 family of silicon hyperabrupt junction varactors. Within this group, the SMV1251 provides intermediate capacitance values between the lower-capacitance SMV1249 and the higher-capacitance SMV1253. All members share identical absolute maximum ratings and general electrical characteristics defined in the shared datasheet.

Replacement Considerations

SMV1251-079LF: Identical electrical specifications utilizing the SOD-882 package instead of SC-79.