Part Number: KDV147

Function: Variable Capacitance Diode, Silicon Epitaxial Planar Diode

Package: TO-92M Type

Manufacturer: KEC

Image and Pinouts:

Description

The KDV147 is a 15V silicon epitaxial planar variable capacitance diode (varactor) designed for voltage-controlled tuning applications in RF circuits, typically supplied in a compact small-signal package. It provides low series resistance and stable capacitance variation characteristics, making it suitable for frequency tuning and modulation. This device is primarily used in FM radio band tuning, VCO circuits, and RF filtering applications.

Features

• Low series resistance with r_s=0.3Ω (typ.)
• Optimized for voltage-controlled capacitance tuning
• Compact small-signal package
• Silicon epitaxial planar construction for stability
• Suitable for RF and high-frequency applications

Pinout

Absolute Maximum Ratings (Tc = 25 °C)

Design Notes

• Operate strictly under reverse bias to utilize capacitance variation
• Capacitance decreases as reverse voltage increases (nonlinear characteristic)
• Minimize series resistance effects for high-Q tuning circuits
• Use stable bias voltage for predictable frequency control
• Temperature variation can affect capacitance, consider compensation if required

Typical Circuit Usage

• Voltage-controlled oscillators (VCO)
• RF tuning circuits in FM receivers
• Frequency modulation circuits
• Band-pass and notch filters with tunable response
• PLL frequency control systems

How to Choose This Part

• Select when low-voltage (≤15V) tuning range is sufficient
• Ideal for FM band and low-power RF applications
• Ensure required capacitance range matches tuning needs
• Prefer when low series resistance is critical for Q factor
• Consider alternative varactors for wider tuning ratios or higher voltage operation

Applications

• FM radio band tuning
• Wireless communication circuits
• Signal generators and RF modulators
• Frequency synthesizers
• Consumer RF electronics

Alternative / Equivalent Products

• BB109 (common varactor diode)
• MV2109 (tuning diode alternative)
• 1SV149 (low-voltage varactor diode)
• BBY51 (SMD varactor option)
• KV1235 (similar tuning diode)

Other data sheets are available within the file:

KDV147A, KDV147B, KDV147C, KDV147D

KDV147 Datasheet PDF Download

Part Number: EGP10F

Function: 1A, 300V, Glass Passivated High Efficiency Rectifier

Package: DO-41 Type

Manufacturer: ON Semiconductor

Image and Pinouts:

Description

EGP10F is a high-efficiency, ultrafast recovery rectifier diode rated for 1A average current and 300V reverse voltage. It is optimized for high-frequency switching applications where low switching loss and fast recovery are critical.

Features

• Superfast recovery time (typically tens of ns range)
• Low forward voltage drop (improves efficiency)
• Low reverse leakage current
• High surge current capability
• High reliability under switching stress

Functional Characteristics

• Designed for fast switching → minimizes reverse recovery losses
• Suitable for high-frequency SMPS topologies
• Better efficiency compared to standard rectifier diodes
• Handles repetitive switching stress in inductive environments

Comparison with Other Diodes

• Standard Rectifier (e.g., 1N4007): Slow (µs range), unsuitable for high frequency
• Fast Recovery Diode: Improved, but slower than EGP series
• Ultrafast (EGP10F): Ideal for tens to hundreds of kHz SMPS
• Schottky: Lower VF but lower voltage rating (typically <200V)

Design Considerations

• Use in high-frequency switching nodes (flyback, forward converters)
• Minimize loop inductance to reduce voltage spikes
• Ensure adequate thermal dissipation (PCB copper area)
• Consider snubber network if high dv/dt ringing occurs
• Verify reverse recovery softness for EMI performance

Typical Applications

• Switch Mode Power Supplies (SMPS)
• Freewheeling / flyback diodes
• DC/DC converters
• Snubber and clamp circuits
• High-frequency rectification

Equivalent / Alternative Parts

• UF4004 ~ UF4007 (ultrafast rectifiers, similar class)
• FR107 (fast recovery diode, slower alternative)
• HER108 (high efficiency rectifier)
• MUR110 / MUR120 (higher performance ultrafast diodes)

Other data sheets are available within the file:

EGP10A, EGP10B, EGP10C, EGP10D

 

EGP10F Datasheet PDF Download