You can consider using the surge current test and HTRB HTIR test the current resistance size in addition to the size of the chip, but also the chip passivation mode and the structure of the heat dissipation is good or bad welding strength is directly related to ultrafine recovery diode SF56 Parameters: Model: SF56 Maximum repetitive peak reverse voltage: 400V Max RMS voltage: 280V Max DC blocking voltage: 400V Max average forward rectified current: 5.0A peak forward surge current @8.3ms Sinusoidal half wave: 150A Max instantaneous forward voltage at 5.0A:1.25V Max reverse current @25℃ : 5.0Ua Maximum reverse current @100℃ : 50Ua Maximum reverse recovery time: 35NS Typical junction capacitance: 50PF Main Scope: Professional Diode 1N4001-4007 1N5390-5399 1N5400-5408 UF101-4007 FR101-307 HER101-608 SF11-68 SR110-5200 MUR Series 6A-10A Note: 1) Some single tubes, a total of three pins, the middle of the empty foot, generally cut off at the factory, but there are also not cut. 2) If one pipe in the pipe is damaged, it can be used as a single pipe. 3) When measuring the pressure drop of the positive wizard, R×1 must be used. If R×1k file is used, because the test current is too small, it is far lower than the normal working current of the pipe, so the measured VF value will be significantly lower. In the above example, if R×1k is selected, the forward resistance is equal to 2.2kΩ, where n '=9 cells. The VF value calculated from this is only 0.27V, much lower than the normal value (0.6V).