Westren Electric Trimline Controller IC  
Written by AnubisTTP on 2011-03-10  


This bizarre looking hybrid integrated circuit is the controller used in many Western Electric Trimline phone handsets. The device makes use of a rather unusual construction technique in which multiple layers of glass with attached semiconductors and passives are bonded together and coated in resin. Numerous ball bond wires connect the different layers of the integrated circuit electrically. The passive resistors can be clearly seen through the top of the device as tracks of resistive material painted or etched onto the surface of the glass substrate.


Westren Electric Trimline Controller IC

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