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点评
IRF540漏极最大电流33A,导通电阻0.052,漏源耐压100,功率94W,开启电压4伏,IRF640漏极电流18A,导通电阻0.18,漏源耐压200,功率125W,开启电压2~4伏,不建议后者代换前者,内阻高,电流偏小
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