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Frequently Asked Questions (FAQs)
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Question: I am new here. Can you help me navigate through this website? What are the things I can do on this website?
Answer: See our quick link page here for all the features on this website. |
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Common On-Hold Criteria
You can help ensure that your order gets manufactured without being put on hold. Please review these common reason for on-holds.
- Any file is corrupt or missing
- Fabrication Print is not supplied, or it is missing the following:
- Material type and finished thickness of the board
- Finished copper weight
- Board dimensions and outline
- Cut outs or slots information
- Discrepancies between Gerber and Fabrication Print
- Board Construction is not defined
- Surface finish not defined
- No Drill file available.
- Drill file is not ASCII format
- Missing holes
- Plated and Non-Plated holes not defined
- No Aperture list available
- No layer stack up information available
- Gerber files not scaled one to one
- Thermal connections missing on plane layers
- Plane Layers should be supplied in negative format for the following reasons:
- Negative layers, in many cases, are not as large of a file size as positive layer files
- Negative layers are much quicker to work with when we run our Engineering Analysis
- Positive layers contribute to longer test times in final test.
- Polygons in plane layers and signal layers are not desired for the following reasons:
- Our CAD program will attempt to fill the polygons automatically but can miss some areas on the layers. This would result in missing data and possibly a non-functional board.
Important note for customers who want Electrical Testing of their circuit boards:
We expect customers to provide IPC Netlist for the boards that need to be electricaly tested. If IPC Netlist is not provided in 356 format, Sierra Proto Express will create a netlist from the incoming customer Gerber files to generate an electrical test program. In such cases, Sierra cannot guarantee, nor can it be liable for the electrical performance of the boards, since the test program itself is derived from the files submitted.
Business FAQs
Q. How can I establish credit?
Answer: (Note that Internet orders are through credit card (Amex/Visa/MC) only).
For orders through your Account Managers, standard terms are net 30. Anything
different must have written approval. Fax your credit information to
408-735-1408 with Attn: Credit Department on the cover sheet.
Please fax the following: Your name, company, address, bank references and at
least 3 trade references.
Q. How are taxes calculated?
Answer: No Sales Tax is charged for orders shipped to a location outside of
California. All Engineering charges are taxed as per California tax law. To
exempt a standard, full service order from tax, you must submit a purchase order
clearly stating that boards are for resale and include resale number on the day
of the order, as well as a resale card.
For our online specials, you can upload resale card information on the website while placing the order.
Q. Can I use my own FedEx account?
Answer: For Full Service Internet orders, we accept your FedEx account number.
Please use your Account Manager to place orders with your FedEx account number.
TYPICAL TERMS FOR ORDERS PLACED ONLINE ON THIS WEBSITE
(1) For orders shipped to a California address, appropriate CA sales tax WILL be charged to your account unless re-sale information has been provided. Please call customer service if you have any questions about this. You can provide all re-sale information while placing order online.
(2) The order Ship Date will be calculated based on when we receive your complete and accurate design files. We now recommend sending us your files during the order process for quicker processing.
(3) We have the right to refuse or requote any order within 24 hours of order placement.
(4) Cut off time is 5 PM Pacafic Time.
(5) LIMITED LIABILITY: Warranty extends only to bare PCBs and does not apply after components are added by you or others. Our liability shall not exceed price paid by you for the ordered PCBs. No change or addition to the terms on our Quote, or any additional or different terms on your purchase order, shall be binding on us unless executed in writing by one of our officers.
(6) Manufacturing optimizations: As most other PCB manufacturers, we may make simple optimizations to your design to ensure boards are manufactured correctly. Such changes do not affect the electrical functionality of your design. These may include:
A) Teardrops may be added to pad/trace interfaces to ensure better connectivity.
B) Slivers less than .005" may be filled in to prevent resist slivers on the panels.
C) Soldermask dams that are less than .004" wide between SMD pads which have a .003" minimum clearance may be gang relieved.
D) Silkscreen may be clipped to ensure it does not get on top of pads/copper features.
7) If you have chosen to get Electrical Testing for your PCBs we recommend you provide the IPC Netlist in 356 format. If you can not provide this, Sierra Proto Express will create a netlist from the incoming customer Gerber files to generate an electrical test program. In such cases, Sierra cannot guarantee, nor can it be liable for the electrical performance of the boards, since the electrical test program itself is derived from the files submitted.
Disclaimer: We strive to keep information on this page relevant and
accurate. However, some information may change over time or may be out-of-date
at the time you read it. You can confirm any information by contacting our
Customer Service.
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