Cure schedule optimization for Junction Coating Resin KJR-651E

It is easy to con­clude is that it is nec­es­sary for man­u­fac­tur­ers of diodes, thyris­tors and oth­er high pow­er devices to deter­mine the Shin-Etsu KJR-651E cure con­di­tion that gives the best char­ac­ter­is­tics of the poly­imide sil­i­cone on cus­tomers devices. This is meant to act as a guide to opti­mize the process for many cus­tomers.

Our stan­dard cure sched­ule rec­om­men­da­tion for the Shin-Etsu KJR-651E is as fol­lows:
150°C for 1hr + 200°C for 1hr + 250°C for 4 hrs

This is the min­i­mum cycle required to dri­ve out the sol­vents and get good cure char­ac­ter­is­tics. How­ev­er, this is only a rec­om­men­da­tion; a good start­ing point.

Some man­u­fac­tur­ers use a hot­ter, longer cure cycle such as :
110°C for 1hr + 200°C for 1hr + 250°C for 8hrs + 300°C for 4hrs + 380°C for 30 mins.

It has been deter­mined by them that this is opti­mum cure cycle required to max­i­mize per­for­mance and min­i­mize cur­rent leak. This has been con­firmed by sev­er­al cus­tomers who mea­sure the gate leak­age or leak­age cur­rent at the max­i­mum tem­per­a­ture of the junc­tion test when the reverse volt­age is applied.

These two cure con­di­tions like­ly (but not def­i­nite­ly) rep­re­sent the two extremes in cure con­di­tions that cus­tomer could use to test the per­for­mance of their parts – espe­cial­ly to test for gate leak­age at high tem­per­a­tures. Though the high­er tem­per­a­ture may give bet­ter gate leak­age para­me­ters, the stan­dard may give bet­ter adhe­sion char­ac­ter­is­tics. Either way, these para­me­ters ulti­mate­ly need to be test­ed by the cus­tomer, ulti­mate­ly test­ing both the adhe­sion char­ac­ter­is­tics and leak­age cur­rent at the max tem­per­a­ture of the junc­tion test.

For more infor­ma­tion, please vis­it us or con­tact us for more details.

About Chris Perabo

Chris is an energetic and enthusiastic engineer and entrepreneur. He is always interested in taking highly technical subjects and distilling these to their essence so that even the layman can understand. He loves to get into the technical details of an issue and then understand how it can be useful for specific customers and applications. Chris is currently the Director of Business Development at CAPLINQ.

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