Transistor Datasheet

• Transistor Datasheet
  Posted by Havass on 25 Jul, 2023 22:32
• Hello,
  
  I want to design a clapp oscillator with the transistor BFP650.  But I dont know which hfe is the correct one. Without it, I can`t calculate Ic and Ib
  
  Ty 

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• #1 Reply
  Posted by Kim Christensen on 26 Jul, 2023 01:13
• Design your circuit so it's not overly sensitive to variations in beta.
  
• #2 Reply
  Posted by magic on 26 Jul, 2023 13:53
• Is this the Infineon datasheet?
  
  In fig. 3 the μA number on the right traditionally indicates base current corresponding to given line. This implies β in excess of 100.
  Fig. 5 and 6 can be combined to produce β estimate at 2V Vce - the result is again in excess of 100.
  
  It looks like fig. 4 may be the wrong one.
• #3 Reply
  Posted by golden_labels on 26 Jul, 2023 16:51
• Could it be, that Fig. 4 has “% maximum” on the vertical scale, not A/A?
• #4 Reply
  Posted by Vovk_Z on 26 Jul, 2023 17:11
• Anyways, I guess we have to take the minimum one for calculations.
• #5 Reply
  Posted by magic on 26 Jul, 2023 19:14
• Quote from: golden_labels on 26 Jul, 2023 16:51

  Could it be, that Fig. 4 has “% maximum” on the vertical scale, not A/A?
  

  Sometimes hFE is plotted as percentage of the value specified in "electrical characteristics" table. Then it would be 100% at 5mA for this part.
  I guess percentage of the maximum is also a possibility, though I don't think I have ever seen it yet.
• #6 Reply
  Posted by Kim Christensen on 26 Jul, 2023 20:04
• Build a Clapp circuit properly biased like this one and all you'll have to worry about is the minimum beta spec.