PCB (medical device) Surface Finish Selection.

#1
Question:
What PCB finish shall we select (by the best fit to the design and not by the price):
(Immersion silver, Immersion Gold, Hassel, Other)?
What are the advantages/disadvantages of each?

PCB Description:
No. of layers: 8
Finished Thickness: 1.6mm (0.06 inch)
Material Type: FR4 (Tg 150)
Base Copper External Layers: 0.5oz
PCB size: 120x100mm (4.7x4 inch)
Layout: very dense.

Device Characteristics:
Type: Medical device (stand alone unit - contains 1 PCB, air pump and solenoid valves).
RoHS: Compliant (lead free)
RF components/capabilities: NO
BGA components: NO
Fine pitch components: YES (up to 100 pins)
Smallest components: 0603
Ambient temperature: 10~60ºC (50~140ºF)
Max Current: 2A (at 10VDC)

tHANKS
nISSIM
 
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#2
Question:
What PCB finish shall we select (by the best fit to the design and not by the price):
(Immersion silver, Immersion Gold, Hassel, Other)?
What are the advantages/disadvantages of each?

PCB Description:
No. of layers: 8
Finished Thickness: 1.6mm (0.06 inch)
Material Type: FR4 (Tg 150)
Base Copper External Layers: 0.5oz
PCB size: 120x100mm (4.7x4 inch)
Layout: very dense.

Device Characteristics:
Type: Medical device (stand alone unit - contains 1 PCB, air pump and solenoid valves).
RoHS: Compliant (lead free)
RF components/capabilities: NO
BGA components: NO
Fine pitch components: YES (up to 100 pins)
Smallest components: 0603
Ambient temperature: 10~60ºC (50~140ºF)
Max Current: 2A (at 10VDC)

tHANKS
nISSIM
You'll find your answers in IPC 2221A. Here is a link to the previous version. I don't think there were radical changes between revisions.
 
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