Provided is an encapsulating resin composition for a power device including an epoxy resin, an inorganic filler, a curing agent, and a curing accelerator. This composition is molded under a condition of 175°C for 2 minutes and then subjected to after-curing under a condition of 175°C for 4 hours to obtain a test piece having a diameter of 100 mm and a thickness of 2 mm, and a half width of a current-time curve obtained by measuring the test piece with a thermally stimulated depolarization current method according to an order of (i) to (v) below is equal to or less than 800 seconds, (i) increase a temperature of the test piece to 150°C at a rate of 5°C/min without applying a voltage, (ii) applying a constant voltage of 500 V for 30 minutes while maintaining the temperature of the test piece at 150°C, (iii) lower the temperature of the test piece to 45°C at a rate of 5°C/min while applying the constant voltage of 500 V, (iv) stop applying the voltage while maintaining the temperature of the test piece at 45°C and leave the test piece to stand for 5 minutes, and (v) increase the temperature of the test piece at a rate of 3.5°C/min without applying a voltage to the test piece, and measure a value of a current flowing during the increase in the temperature to obtain a current-time curve.
本发明提供了一种用于功率器件的封装
树脂组合物,其中包括环氧
树脂、无机填料、固化剂和固化
促进剂。该组合物在 175°C 条件下模塑 2 分钟,然后在 175°C 条件下进行 4 小时的后固化,以获得直径为 100 毫米、厚度为 2 毫米的测试片,并且根据以下(i)至(v)的顺序用热刺激去极化电流法测量测试片所获得的电流-时间曲线的半宽等于或小于 800 秒,(i) 在不施加电压的情况下以 5°C/min 的速度将测试片的温度升至 150°C、(iii) 在施加 500 V 的恒定电压时,以 5°C/min 的速度将试样的温度降至 45°C, (iv) 在将试样的温度保持在 45°C 时停止施加电压,让试样静置 5 分钟, (v) 在不施加电压的情况下,以 3.(v) 在不对试件施加电压的情况下,以每分钟 3.