Chip on board I believe is no sweat as long as you designed properly in terms of both Materials and process. Embedded passive. Depend upon what do you mean of embedded. If you are talking about resistor and capacitor build inside PWB, for harsh environment, I would be a bit on caution side. However, the space is not harsh if it is inside the module, more clean than clean room 10000. If you mean embedded as screen on resistor with a laser trimmed, cap inside module, noproblem. The real challenge would be cap need to be precision gated on its capacitance at wide temp and harsh environment, and high frequency, you might need spend few extra $ of few sleep less nights to get it right. Avionics and special equipments are not repairable when you have embedded, it is "All or nothing" you might have to do a redesign if god forbidden, any obsolescence occurs. My 1.79 cents.

"All professional skills are mastered by critiqued practice" - by Schon.
  Original Message
From: Joel S. Peiffer
Sent: Wednesday, February 26, 2014 8:46 PM
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: Re: [TN] COB and embedded passives


Embedded formed passives, both capacitors and resistors have been utilized
in volume military and commercial avionics for many years.  Inserted
passive components in avionics is still in development I believe.

Regards, Joel

Joel S. Peiffer
3M Electronic Solutions Division
3M Center, Building 201-1E-17
Tel:  (651) 575-1464
Cell:  (612) 327-1983
Fax:  (651) 737-4601
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From:   Ioan TEMPEA <[log in to unmask]>
To:     <[log in to unmask]>
Date:   02/24/2014 02:09 PM
Subject:        [TN] COB and embedded passives
Sent by:        TechNet <[log in to unmask]>



Dear Technos,

Is any of you using Chip on Board and embedded passives in space/avionics
applications?

Pros and cons regarding their utilization in space?

Thanks,

Ioan

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