Today we etched a SOT-223 device and protected the sensitive copper wires inside. Have a look! Feel free to click on the photo to view the full-size version:
Complete die exposure of SOT-223
Die exposure and copper wire
Preserved copper wire
Awesome bond pad
Even though we are using nitric and sulfuric acids, the JetEtch Pro CuProtect is quite capable of preserving the wires. Using nothing more than a very basic Definition/Location Gasket stack-up with gaskets that can be found in our accessory kits — and of course an aluminum blank to conduct the bias — we opened this sample in a very short period of time, using very little acid.
This sample required only 360 seconds of etch time with a 3:1 mix at 38ºC, with a flow rate of 2ml/min.
Try finding results like this on competing systems!