Ordinary diode’s main parameter
when (1) biggest commutated current ICM, diode long time use, permits most Taisho which ties through PN to electric current.
(2) highest reverse working voltage URM, when diode normal work can withstand highest reverse voltage value.
(3) most greatly reverse electrical current IRM, refers to the reverse electrical current which allows under the highest reverse working voltage to wind through.
(4) the highest operating frequency,The electronic primary
is refers to guarantees diode normal work the upper frequency.
Zener diode’s parameter
(1) regulated voltage UZ, refers to the stabilovolt, in makes under normally the condition in the organization, pipe both sides voltage.
(2) steady state current IZ and most greatly steady state current IZ(max), stabilovolt work when the steady varactor decides voltage UZ the operating current called when steady state current IZ, pipe steady work, do not surpass the electric current calls most greatly steady state current IZ(max).
(3) the voltage temperature coefficient, is refers to the stabilovolt the temperature change influence coefficient. The constant voltage value is higher than 6 volts stabilovolts to have the positive temperature coefficient, namely the constant voltage value slightly has the rise along with temperature increment; The constant voltage value is lower than 6 volts stabilovolts to have the negative temperature coefficient, namely the constant voltage value slightly has the drop along with temperature increment; But the constant voltage value is 6 volt about stabilovolt temperature coefficient basic is zero.
Crystal diode’s main parameter short foot
1: Resistance ⑴DC resistance Adds on certain DC voltage on the crystal diode V, has pair of that direct current I, the DC voltage V and direct current I ratio, is crystal diode’s equivalent direct current. ⑵Dynamic current
Adds in the certain DC voltage V foundation on the crystal diode, adds on an increase voltage again, then the crystal diode also has increase electric current △I. The increase voltage △V and increase electric current △I ratio, is crystal diode’s dynamic resistance, namely dynamic resistance for crystal diode both sides voltage change and electric current change ratio.
Diode’s forward DC resistance and the dynamic resistance are different change along with the operating point. When ordinary crystal diode echo movement, its DC resistance and the dynamic resistance are very big, usually may be is the infinity. 2: Nominal current
Crystal diode’s nominal current is when refers to the crystal diode long time continuous working, the permission passes most Taisho to mean current. When diode continuous working, is causes the temperature which PN ties not to surpass some limit value, the commutated current should not surpass the standing operating procedure the permissible value.
For example: the 2AP1 nominal current is 12mA; 2AP5 is 16mA; 2AP9 is 5mA. Regarding high efficiency crystal diode, to reduce its temperature, increases the electric current, must install the radiator fin.
3: Back breakdown voltage Hotel interior design contemporary style The back breakdown voltage is refers to the diode the most greatly reverse voltage which can withstand in the work, it is also causes the diode not to send the echo puncture the voltage limit value. Generally, the most greatly reverse working voltage should be smaller than the back breakdown voltage. Selects when the crystal diode switch diode, but must take the most greatly reverse working voltage as the standard, and leaves leeway the suitable leeway, guaranteed that the diode does not send the damage.
For example: the 2AP21 diode’s back breakdown voltage is the 15V most greatly reverse working voltage is smaller than 10V; the 2AP26 back breakdown voltage is 150V, the most greatly reverse operating current is smaller than 100V. 4: Highest operating frequency
The highest operating frequency is refers to the crystal diode to be able the normal work upper frequency. When selects the diode, must make its operating frequency to be lower than the highest operating frequency.
For example: the 2AP8BD highest operating frequency is 150MHz; the 2CZ12 highest operating frequency is 3kHz; the 2AP16 highest operating frequency is 40MHz.