Steps for Selection

Stepl：Determine the circuit’s operating parameters. IH： Normal operating current. Vmax：

　　　　Maximum device operating voltage. T：Select the device operating temperature. Example:

　　　　72V　480mA,40ºC.

Step2：Definite part installment way,to determine the part is double pinouts or piece ； Example：

　　　　double pinouts.

Step3：Examine PIC1（PTC List），find out Voltage（72V），So It belong GBX series.

Step4：Pls go on examine PIC2（Typical T-I Derating Form），find out the discount modulus of hold

　　　　current at 40ºC; is 81%，so Ih=400mA/0.81=494 mA.

Step5： PLS choose Ih>=494 mA in GBX series，So fing out the most suitable model is GBX050.

Step6：Evaluate the suitability of the elected device by experiment.

1. PTC List

2. Typical T-I Derating Form