本发明提供一种不易受到谐振频率的影响、且能够抑制隔离特性的变动的开关电路和半导体模块。开关电路(504)包括第1至第N+1输入输出端子(T1～T(N+1))、以及第1至第N FET(101～10N)，其中，N为2以上的整数，在将源极端和漏极端中的某一端称为第1端，另一端称为第2端时，第1输入输出端子(T1)与第1至第N FET(101～10N)中所有的第1端电连接。对于1到N中各整数i，第iFET的第2端与第i+1输入输出端子电连接。对于1到N中至少任一个整数j，电感器分量和电阻分量以串联方式电连接而得到的电路以与第j FET并联的方式电连接在第j FET的第1端与第2端之间。
The present invention provides a switching circuit and a semiconductor module which are not influenced by the resonant frequency easily, and can restrain the change of the isolation characteristics. The switching circuit includes first to (N+1)th input/output terminals and first to Nth field-effect transistors (FETs), for an integer N of two or more. When one of a source end and a drain end is referred to as a first end and another one is referred to as a second end, the first input/output terminal is electrically connected to the first ends of all of the first to Nth FETs. For each integer i of one to N, the second end of the ith FET is electrically connected to the (i+1)th input/output terminal. For at least one integer j of one to N, a combination in which an inductor component and a resistor component are electrically connected in series to each other is disposed between the first and second ends of the jth FET such that the combination is electrically connected in parallel to the jth FET.