KSC3503 Transistor Pinout, Applications, Equivalent, Features and Other Useful Information

KSC3503 is a high voltage transistor available in TO-126 package. Today we are going to discuss KSC3503 transistor pinout, applications, equivalent, features and other useful information about it.

 

Features / Technical Specifications:

• Package Type: TO-126
• Transistor Type: NPN
• Max Collector Current(IC): 100mA
• Max Collector-Emitter Voltage (VCE): 300V
• Max Collector-Base Voltage (VCE): 300V
• Max Emitter-Base Voltage (VBE): 5V
• Max Collector Dissipation (Pc): 7W
• Max Transition Frequency (fT): 150 MHz
• Minimum & Maximum DC Current Gain (hFE): 40 to 320
• Max Storage, Operating & Junction temperature range: -55 to +150 Centigrade

 

PNP Complimentary:

PNP complimentary of KSC3503 is KSA1381

 

Replacement and Equivalent:

BU724, BU724A, KSC2752Y, 2SD483, 2SD1839, 2SC3425, 2SC3503, 2SC3790.

 

KSC2690/2690A Transistors Explained / Description:

KSC3503 is a high voltage and low current transistor specially designed for circuits that require high voltage transistors and where high current is not crucial. It is an NPN transistor available in TO-126 package. The maximum collector to emitter voltage of the transistor is 300V, max collector to base voltage is 300V, emitter to base voltage is 5V, max collector current is 100mA, max pulsed collector current is 200mA, max junction temperature is 150°C, the transition frequency or “fT” is 150MHz which is also a plus point makes this transistor capable to use in high frequency and RF circuits, max collector dissipation is 7W and the reverse transfer capacitance is 1.8pF. The reverse transfer capacitance or the gate to drain capacitance also called miller capacitance which affects the rise and fall times of voltage when the transistor is performing switching.

But one thing should be kept in mind that these are the absolute maximum ratings of the transistor and it is recommended by all components manufacturers that do not drive the component on its absolute maximum ratings. Driving a component on its absolute maximum ratings may damage the component immediately or weakens its performance. So as we always suggest that use any component atleast 20% below from its absolute maximum ratings.

The transistor is manufactured in four different DC current gain values or hFE classifications which can find out by checking the last alphabet after the part number mentioned on the front side of the transistor. Now if that alphabet is “C” then the hFE will be 40 to 80, if the alphabet is “D” then the hFE will be 60 to 120, if “E” then the hFE value will be 100 to 200 and if “F” then the hFE value will be 160 to 320.

 

Where We Can Use it & How to Use:

KSC3503 is a high voltage transistor designed to use in applications that requires a high voltage and low current transistor. Moreover, it can also be used in audio, current source and other general purpose amplifier applications. The detailed list of its applications can be found under the “Applications” heading below. Additionally, it can also be used in switching applications.

 

Applications:

Audio amplifier and other audio related applications

General purpose amplifiers

Low current switching

Voltage amplifiers

Current source

Radio and RF Applications under 150MHz

Any general purpose applications that fall under its ratings

 

Safe Operating Guidelines / Absolute Maximum Ratings:

Before using the component in your design or circuit is it important to check its absolute maximum ratings and use it in your design or circuit according to it. As we have mentioned above use it atleast 20% below from its absolute maximum ratings.

• The max collector to emitter voltage of the transistor is 100mA, therefore to not drive load more than 80mA.
• The maximum collector to emitter voltage is 300V therefore do not drive load of more than 240V.
• Always use a proper heatsink with the transistor
• And always store of operate it at temperature above -55°C and below +150 °C.

 

Datasheet:

To Download the datasheet just copy and paste the below link in your browser.

https://z3d9b7u8.stackpathcdn.com/pdf-down/K/S/C/KSC3503_FairchildSemiconductor.pdf