Hi, This is my first foray into making production quantity circuits, I'm almost ready to design a PCB for an initial prototype, my initially quanties will be around 50 devices. In production 'hopefully' they will be in the 10's thousands (i will also possibly consider a contract manufacturer overseas if it comes to that)
Whats really confusing to me is selecting a parts supplier and generally figuring out which parts to select. Here's an excerpt from my BOM header :
- Part Number
- Unit Cost
- 1K Cost
- 10K Cost
- Local Lead Time (for prototype)
- CM Lead Time (for production)
- End of life schedule
- Alternative parts
The parts are typically a 8 bit controller (AVRMega or Freescale etc), some RF front ends, some amplifiers, descreets etc.
My questions :
- Do those data points look about right in trying to make decisions on which part to buy? What else would you consider. Note: I pretty much have 2 separate routes I could take in selecting the MCP and RF so thats not an issue.
- How do folks usually go about getting parts? i.e. for a prototype (50 nos) would you go to a single supplier (Avnet/Digikey/Mouser etc) for 'ALL' parts or would you stagger your buying based on pricing/availability etc.
- Not all of these supplier sites have all the data i'm looking for, i.e. digikey doesn't show lead times. Whats a good way to go hunting for all of this info (the number of items I have are around 30- its a pain to try and hunt them down individually)
- Whats your typical strategy for selecting suppliers for local and contract manufacturing (asia)?
- Whats up with WIERD lead times, looked up a MCP's lead time and it shows anywhere from 17 to 99 week leadtimes for almost all parts of that family. (havn't spoken to the manf yet though). Thats a tough call to make isn't it, decide architecture design etc and then find those parts have huge lead times.
Any suggestions/advice welcome, i'd also really appreciate it if you'll could suggest books/sites that could educate me better on these processes. Thanks K