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Reading individual technical datasheets for BRTs

Major electrical characteristics
Characteristic Symbol Test Conditions Min Typ Max Unit
1. Input voltage (ON) RN1401 VI (ON) VCE = 0.2 V, IC = 5 mA 1.1 2 V
RN1402 1.2 2.4
RN1403 1.3 3
RN1404 1.5 5
RN1405 0.6 1.1
RN1406 0.7 1.3
2. Input voltage (OFF) RN1401~1404 VI (OFF) VCE = 5 V, IC = 0.1 mA 1 1.5 V
RN1405, 1406 0.5 0.8
Transition frequency RN1401~1406 fT VCE = 10 V, IC = 5 mA 250 MHz
Collector output capacitance RN1401~1406 Cob VCB = 10 V, IE = 0, f = 1 MHz 3 6 pF
3. Input resistor RN1401 R1 3.29 4.7 6.11
RN1402 7 10 13
RN1403 15.4 22 28.6
RN1404 32.9 47 61.1
RN1405 1.54 2.2 2.86
RN1406 3.29 4.7 6.11
4. Resistor ratio RN1401~1404 R1/R2 0.9 1.0 1.1
RN1405 0.0421 0.0468 0.0515
RN1406 0.09 0.1 0.11
  1. Input voltage required for a transistor to turn on and conduct the specified current
  2. Input voltage required to meet the conditions under which a transistor is defined as off.
  3. Resistance of resistor R1 in series with the base terminal of a transistor. The resistance variation is ±30% relative to the typical value.
  4. Ratio of the R2 resistance to the R1 resistance
    Example: The typical resistance of R1 in the RN1401 is specified as 4.7 kΩ, and its resistor ratio is specified as 1. In this case, the typical resistance of R2 is 4.7 kΩ.
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