Selection criteria for semiconductor diodes (cqcwc)

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Selection criteria for semiconductor diodes (cqcwc) [Copy link]

Selection criteria of diodes (cqcwc)

Selection criteria of diodes in circuit design
1. Selection based on circuit function:
Germanium detection diodes should be used for high-frequency detection circuits. They are characterized by high workpiece frequency, small forward voltage drop and
small junction capacitance. 2AP11~17 is used for less than 40M, 2AP9~10 is used for less than 100M, 2AP1~8 is used for less than 150M, and 2AP30 is used for
less than .
2. Based on the volume of the whole machine
, the whole machine is developing in the direction of miniaturization, thinness and lightness, requiring the matching diodes to be miniaturized and sheet-shaped.
The glass shell length of DO-35 switching diodes and frequency band switching diodes is 3.8mm, the glass shell length of DO-34 frequency band switching diodes is
2.2mm, and the length of SOD-23 plastic encapsulated variable capacitance diodes is 4mm.
3. Reasonable selection of diodes based on the cost performance of the whole machine:
Reasonable selection is made based on the cost performance of the whole machine and the role of the matching diodes in the whole machine.
Diode use criteria in circuit installation
1. Use below the maximum rated value
2. Use at reduced rating.
3. Use at a temperature much lower than the maximum junction temperature.
4. Cut, shape and install the diode correctly.
5. Precautions for use
. As diodes are developing towards miniature, ultra-miniature and sheet-shaped, special attention should be paid to the following matters during use: 1. For point-
contact type and glass shell diodes, prevent them from falling on hard ground. 2. For glass shell diodes, prevent the soldering iron from directly
contacting the glass shell during welding. 3. Do not apply forward voltage to the voltage-stabilizing diode. 4. Schottky diodes are easily damaged by static electricity, and people and equipment should
be grounded . 5. For sheet diodes, pay attention to the expansion coefficient of the diode itself and the printed circuit board. 6. For diodes with matching requirements,
avoid mixing them during use to avoid affecting debugging.