KSA1220/1220A Pinout, Applications, Equivalents, Features and Other Info

KSA1220 and KSA1220A are two transistors of the same series which are almost identical to each other with minor differences between them which we will discuss in this post but still they can be used interchangeably. This post contains all the related information about KSA1220/1220A pinout, applications, equivalents, features, and other important information.


KSA1220/1220A Pinout, Applications, Equivalents, Features



If you are looking for a transistor that can drive load of upto 1A current and also capable to drive the load voltage of more than 100V then KSA1220/1220A can be a good choice. The transistor can be used for various general purpose applications that falls under its ratings.


Features / Technical Specifications:

  • Package Type: TO-126
  • Transistor Type: PNP
  • Max Collector Current(IC): -1.2A
  • KSA1220 Max Collector-Emitter Voltage (VCE): -120V
  • KSA1220A Max Collector-Emitter Voltage (VCB): -160V
  • KSA1220 Max Collector-Base Voltage (VCE): -120V
  • KSA1220A Max Collector-Base Voltage (VCB): -160V
  • Max Emitter-Base Voltage (VBE): –5V
  • Max Collector Dissipation (Pc): 20W
  • Max Transition Frequency (fT): 175 MHz
  • Minimum & Maximum DC Current Gain (hFE): 35 to 320
  • Max Storage, Operating & Junction temperature range: -55 to +150 Centigrade


PNP Complimentary:

PNP complimentary of KSA1220/1220A are KSC2690/2690A.


Replacement and Equivalent:

2SA696, 2SA795, 2SA818, 2SA835, 2SA898, 2SA899, 2SA939, 2SA1110, 2SB526, 2SB527, 2SB528, 2SB536, 2SB648, 2SB649, MDS60, BD348, BD380, BD238G, MJE171, MJE702, BD792


KSA1220/1220A Transistors Explained / Description:

KSA1220 and KSA1220A are transistors of the same series which are almost identical to each. The only minor difference between the two is their collector-emitter voltage and collector – base voltage but still, you can easily use them interchangeably in all conditions when the load required voltage is under 100V. But if the load requirements are above 100V then in this condition, you cannot use KSA1220 in place of KSA1220.

The transistors are having quite interesting specs the max collector current is 1.2A, the max pulsed collector current is -2.5A, the max collector to emitter voltage of KSA1220 is -120 and KSA1220A is -160V. The max collector to base voltage of KSA1220 is -120 and KSA1220A is -160V. Max DC current gain is 35 to 320, max transition frequency is 175MHz, and max collector dissipation is 20W.

It can be used in a variety of general purpose applications. You can use it as a switch and amplifier. Moreover, it can also be used in RF applications. The detailed list of its applications is mentioned under applications heading below.

The transistor is available in three different types according to its DC current gain which can be determined by the last alphabet after the part number of the transistor. If that alphabet is “R” then its DC current gain or hFE will be 60 to 120, if the alphabet is “O” then its hFE will be 100 to 200, and if the alphabet is “Y” then its hFE will be 160 to 320.


Where We Can Use it & How to Use:

As mentioned above this transistor can be used in variety of general purpose switching and amplification applications. When used as a switch it is capable to drive load of upto 1.2A. But we cannot use any transistor to its absolute maximum ratings because the manufacturer does not recommend it because using a component with its absolute maximum ratings can damage it or weakens its performance. So as a rule of thumb we will use it 20% below from its max ratings.



Radio and RF Applications under 175MHz

Audio amplifiers

Motor Drivers

General Purpose Applications that Fall Under its Ratings


Safe Operating Guidelines / Absolute Maximum Ratings:

Below are the guidelines to safely operate the transistor in your design or circuits.

  • The max continuous collector current is 1.2A or 1200mA therefore do not drive load of more than 960mA.
  • The max collector to emitter voltage of KSA1220 is 120V therefore do not drive load of more than 96V. The max collector to emitter voltage of KSA1220A is 160V so do not drive load of more than 128V.
  • Do not store or operate the transistor at temperatures below -55°C and above +150 °C.



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