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 rs=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)
| Parameter | Symbol | Value | Unit |
| Reverse Voltage | VR | 15 | V |
| Junction Temperature | Tj | 150 | °C |
| Storage Temperature | Tstg | -55 to 150 | °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
