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KDV147 Datasheet PDF – 15V, Variable Capacitance Diode

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Part Number: KDV147

Function: Variable Capacitance Diode, Silicon Epitaxial Planar Diode

Package: TO-92M Type

Manufacturer: KEC

Image and Pinouts:

KDV147 datasheet

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


KDV147 pdf

K4145 Datasheet – 60V, N-Ch, Power MOSFET – NEC

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This is one of the types of MOSFETs and is a kind of transistor.

Part Number: 2SK4145, 2SK4145-S19-AY

Function: Switching N-Channel Power MOSFET

Package: TO-220 Type

Manufacturer: NEC

Image

K4145 mosfet nec

Description

This is 60V, 84A, N-Channel Power MOSFET. The K4145 is a high-current N-channel power MOSFET optimized for low-loss switching applications. It is particularly suitable for power conversion systems, motor control, and high-efficiency switching designs due to its low RDS(on) and high current capability.

Features

1. Low on-state resistance : RDS(on)= 10 mΩMAX. (VGS= 10 V, ID= 42 A)

2. Low input capacitance : Ciss= 5300 pF TYP.

3. N-channel enhancement-mode MOSFET

4. High drain current capability (up to 84A)

Pinout

K4145 datasheet pinout

 

Absolute Maximum Ratings (Ta = 25°C)

1. Drain to Source Voltage (VGS= 0 V) : VDSS = 60 V

2. Gate to Source Voltage (VDS= 0 V) : VGSS = ±20 V

3. Drain Current (DC) (TC= 25°C) : ID(DC) = ±84 A

4. Total Power Dissipation (TC= 25°C) : PT1 = 84 W

5. Total Power Dissipation (TA= 25°C) : PT2: = 1.5 W

6. Channel Temperature : Tch = 150 °C

7. Storage Temperature : Tstg = −55 to +150 °C

8. Single Avalanche Current  : IAS= 32 A

9. Single Avalanche Energy : EAS = 102 mJ

Typical Applications

  • Switch Mode Power Supplies (SMPS)
  • DC-DC converters
  • Motor drivers
  • Battery-powered systems
  • Load switching (high current)
  • Automotive electronics

Alternative / Equivalent Devices

  • IRLZ44N (logic-level alternative, lower current)
  • IRF3205 (55V, high current MOSFET)
  • AOI518 / AOZ series (modern low RDS(on) MOSFETs)
  • FDB7030BL (low resistance, high efficiency)

K4145 Datasheet