PCBA parts mitigation

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Top 5 Ways to Mitigate PCB Component Availability Problems | Electronic Design

Component shortages got you down? Here are five tactics you can employ to help the situation.

by Duane Benson (Chief Technology Champion, Screaming Circuits)

Oct 29, 2018

...

Hardest hit are multilayer ceramic capacitors (MLCCs). Resistors and many silicon components are also caught up in it. Some components are expected to be in short supply until the year 2020.

...

We may be saying goodbye to 0603 and larger surface-mount packages for many component values.

...

Continue reading for five ways you can minimize the disruption to your design and manufacturing program.

...

My take on Duane's 5 ways :

  1. continual evaluation of BOM for lead time and stock (your stock and distributors' stock)
  2. alternates into the BOM per PCBA manufacturer
  3. value in BOM is narrow or wide tolerance
  4. 0402, BGA and QFN are soon
  5. ready yourself for the 0300 telephone call from the PCBA manufacturer

 

"Dare to be naïve." - Buckminster Fuller

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"Dare to be naïve." - Buckminster Fuller

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Never soldered 0402. Only 0603 and up.

Also, fine pitch 0.4mm are also scaring me. A lot of chinese manufacturers (at least) started to use these 0.4mm pitch chips. Nuvoton, Wiznet. I'm doing only 0.5mm and up.

0.4mm chips are not new, I know, but these days it seems they proliferate.

I soldered quite easily some QFNs. I like QFNs but I'm not comfortable with them. I had once a bord very easy to solder, except a QFN. That one I was just unable to solder. I was forced to send the batch to a manufacturing house (only 25 pcs. of a very easy to make board otherwise) just because of that.

 

There would be hard times for people like me ...

 

If you go with a manufacturing house (probably in China) you loose some flexibility. Also there are other problems. I got one 0603 resistor tombstoned (from some thousands). I can think that 0402 have more problems, no?

I also got 13 leds (0805) not working from 1600! I soldered by hand many thousands of the exactly same part with no single failure! (probably it's from the temperature in the owen?)

 

 

 

 

 

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rammon wrote:
Also, fine pitch 0.4mm are also scaring me.
BGA at less than 0.8mm pitch concerns me as that's outside the capability of inexpensive 4-layer PCB fabs.

1mm pitch BGA FPGA are common to ease prototyping.

MCU packages are approaching tiny.

rammon wrote:
There would be hard times for people like me ...
and an opportunity for others (PCBA fabs)

rammon wrote:
If you go with a manufacturing house (probably in China) you loose some flexibility.
Some China PCBA fabs have offices in Canada (time zone buffer, customer service) though one of China may be source of the 0300 telephone call (your phone on, charged, and on the night stand)

The US prototype PCBA fabs I'm aware of :

  • Screaming Circuits in Canby Oregon
  • MacroFab in Houston Texas
  • Advanced Circuits in Aurora Colorado (Tempe Arizona, Maple Grove Minnesota)

Mid-90s, had part of a prototype assembled by a local SMB; local can be the best if and only if they can be found ... and they survive.

rammon wrote:
I can think that 0402 have more problems, no?
No though depends on the PCBA process and quality control.

rammon wrote:
(probably it's from the temperature in the owen?)
More likely is low quality LEDs (due to low bid?  sourced from the grey market?)

The LEDs fell off a truck wink

 


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"Dare to be naïve." - Buckminster Fuller