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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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如何计算小信号晶体管的结到环境的热阻（Rth（j-a））？
小信号晶体管的结到环境的热阻（Rth(j-a)）可以根据其集电极功耗计算如下：：
方程：Rth(j-a)＝（Tj最大值-Ta）／PC最大值
- Rth(j-a)：结到环境的热阻
- Tj最大值：最大结温
- Ta：环境温度（PC最大值的温度条件）
- PC最大值：最大集电极功耗