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  • Is it possible to drive the TR beyond the maximum ratings, even for a moment? 
    • No. Operation above the maximum ratings will most likely result in breakdown or, at the very least, deterioration (i.e. hFE drop). Please refer to the SOA (Safe Operating Area) for single pulse operation. For, continuous pulse situations, calculation of the power and die temperature are required.
      Please refer to ROHM’s website for more information (e.g. derating curves).
    • Products: Transistors  
  • What is the maximum rating of the Base current? 
    • The maximum Base current rating is 1/3rd the Collector current (1/10th in the case of Darlington transistors). In the case of 2SD2656:
      IC max is 1A for DC and 2A for pulse. Therefore, the max. ratings for Base current is 333mA for DC and 666mA pulse. Digital transistors are designed to ensure that the input current will be within the rated value as long as Vin is within the normal range.
    • Products: Transistors  
  • Is it possible to supply voltage to the Base-Emitter in reverse? 
    • For NPN transistors, VCEO is in breakdown when positive voltage is supplied to the Collector pin while the Emitter is grounded. Conversely, VCEO in PNP transistors is in breakdown when positive voltage is supplied to the Emitter with Collector grounded.
      Breakdown in the opposite direction (e.g. NPN: +V to Emitter, Collector grounded) is roughly equivalent to the breakdown between the Emitter and Base. Typically this is between 5 to 7V, making the Collector-Emitter reverse voltage less than 5V. (If sufficient voltage is supplied to the Collector-Emitter in reverse, deterioration such as low hFE will occur. Otherwise leakage current will flow.)





      The same applies to digital transistors. Voltages up to 5V can be supplied to the Collector-Emitter in the reverse direction as below. However, current flows through what has resistance between an GND terminal and a IN terminal.
    • Products: Transistors  
  • What is avalanche breakdown?
    • Refers to the amount of energy that can be absorbed without causing damage when the rated voltage is exceeded (i.e. during startup or shutdown - provided that the drain current and channel temperature are within the maximum range).
    • Products: Transistors  
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