BD235 Transistor Pinout, Applications, Equivalents, Features and Other Details

BD235 is an NPN transistor designed to drive load of upto 2A and can also drive load voltage of upto 60V. In this post we will understand and discuss BD235 transistor pinout, applications, equivalents, features and other details about this component.


BD235 Transistor Pinout, Applications, Equivalents, Features and Other Details



Absolute Maximum Ratings:

  • Package Type: TO-126
  • Transistor Type:  NPN
  • Max Collector Current(IC): 2A
  • Max Collector-Emitter Voltage (VCEO): 60V
  • Max Collector-Base Voltage (VCBO): 60V
  • Max Emitter-Base Voltage (VEBO): 5V
  • Max Collector Power Dissipation (PC): 25W
  • Max Transition Frequency (fT): 3 MHz
  • Minimum & Maximum DC Current Gain (hFE): 40
  • Max Storage & Operating temperature Should Be: -65 to +150 Centigrade


NPN Complementary:

The PNP complimentary of BD235 is BD236


Replacement and Equivalent:

2SD2052, 2SD1715, 2SD1488, 2SD1018, 2SD1311, 2SD2155, 2SD2029, MJE243G, MJE182G, MJE802G, 2SD2065, 2SD1713, 2SD1289, 2SC2809, 2SD1704, 2SD1717, BD779, BD441, BD379, BD681, BD179, BD679, 2SD1486, MJE270G, MJE241, KSE803, KSE182, BD791, 2SD1725, 2SD1724.


BD235 Transistor Explained / Description:

BD235 is an NPN transistor designed to use in switching and audio amplification applications. But it can also be used in variety of the general purpose applications. Looking at the pinout of the transistor the first pin is Emitter, second pin is Collector and the third pin is Base.

BD235 is a transistor of BD23x series which also contains other two transistors which are BD233 and BD237. All these transistors are almost identical except their voltages but if you are driving the load under 35V then you can easily use any of them alternatively.

The absolute maximum ratings of the transistor is also quite acceptable the maximum collector current is 2A, maximum collector-emitter voltage is 60V, max collector-base voltage is also 60V, max emitter-base voltage is 5V and max collector power dissipation is 25W.

Looking at some other characteristics of the transistor it has quite high transition frequency that is 3MHz which makes it a better candidate for audio amplification, the DC current gain is 40 and collector-emitter saturation voltage is 0.6V.


Where We Can Use it & How to Use:

The transistor is mainly designed to use in amplification and switching applications but can also be used in other applications such as driver and control circuits, power management circuits, signal amplification voltage amplification etc.

The transistor can be used or operated same as we use any other BJT.



DC to AC Converters

Battery charger circuits

Power converter circuits

Audio Amplifiers

LED Drivers

Motor drivers and controllers

Switching Circuits

Inverter Circuits

Battery discharging circuits


PWM controllers

Temperature Control Circuits

Relay drivers circuits

Solar Circuits

Motor Drivers

Variety of General Purpose Applications


Safe Operating Guidelines:

Below are some important guidelines to get the most out of BD235.

  • First of all the main thing is to not use the transistor to its absolute maximum ratings and always stay atleast 20% below from these ratings.
  • Therefore the maximum collector-emitter voltage is 60V but we should not drive load of more than 50V.
  • The maximum collector current is 2A so we should not drive load of more than 1.6A.
  • And transistor’s internal and external temperature should be between -55°C to 150°C.



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

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