June 5th, 2020
Our Silicon Valley facility is deemed "essential" and is fully operational to support medical, defense & other printed circuit board fabrication and assembly projects.
For your more complex boards, please send your quote request to email@example.com. You can also quote and order standard technology PCBs/Assembly online on this website.
Save time and money on these full turnkey boards. Start with your BOM and get an instant quote for fabrication, assembly, and components with an intuitive online ordering system. Manage your order online and work directly with engineers.
2, 4 and 6-layer boards made to IPC-600 Class 2 specs.
Gerber files in RS-274X format only (Extended Gerber) or ODB++ format. Do NOT use Gerber X2 format!
Excellon drill file in ASCII format with the following parameters:
Units = Inch
Tool units = Inch
Coordinate = Absolute
Zeros omitted = Trailing
Number format = 2.4
1, 2, 3, 4 and 10 business days. (When will my boards ship if I order today?)
5 p.m. Pacific Time (All orders received on a weekday until 5 p.m. will start the next weekday as Day 1).
No minimum quantity, but the more you order, the more you save.
100 sq. in. Note: The board X or Y dimension should not exceed 15.9 in. or be less than 0.5 in.
FR-4 lead-free material.
0.062 in. (+/- 0.006 in.). No special constructions are allowed. Our standard construction will result in the overall thickness.
Choose ENIG or HASL.
Minimum hole size
0.008 in. (8 mils) finished hole size allowed.
Minimum trace and space
0.004 in. (4 mils) minimum trace and space widths.
Minimum width of annular rings
0.005 in. This means your pad diameter must be at least 0.01 in. (10 mils) larger than the finished hole size.
1 oz. on outer layers: We start with 0.5-oz. foil and after plating, it becomes about 1 oz. Inner layers have 1 oz copper.
Maximum hole density
Hole density is calculated using the following formula:
Hole density = Total holes on individual board / Area of one board
Hole density specifications for NoTouch PCBs are as follows:
For boards up to 1 sq. in.: We allow up to 100 holes/sq. in.
For boards between 1 and 2 sq. in. area: We allow up to 75 holes/sq. in.
For boards larger than 2 sq. in.: We allow up to 50 holes/sq. in.
Maximum plated hole size
Maximum non-plated hole size
0.250 in. (250 mils). Also note that non-plated holes must not touch any copper.
Green LPI only; we recommend that openings in the solder mask layers should be 0.003 in. larger than the copper feature on each side.
Example: If you have a rectangular pad then solder mask opening around the pad will be overall 0.006 in. larger in each dimension.
Please note: To ensure proper solder mask adhesion between solder mask clearances, we now require a minimum of 0.004” (4 mils) between the solder mask clearances.
White only. Silkscreen is allowed on top and bottom of the printed circuit board.
The minimum width of legend lettering is 0.005 in.
NoTouch PCBs are simple, standard technology PCBs. For example, the following features are NOT ALLOWED in NoTouch orders:
Steps and repeats
Special processes (for example counter bores, counter sinks)
Multiple parts or part numbers (a $10 charge applies to each additional part)
Class 3, mil-spec, or ITAR jobs
Getting your NoTouch PCBs assembled by Sierra?
If you send your NoTouch PCB for assembly in Sierra Circuits (say, using our Web PCB service), please note that:
You accept that these NoTouch PCBs are not electrically tested. You agree to carry all the risk of assembling electrically un-tested PCBs.
Sierra will add one (or possibly 2) buffer day(s) after NoTouch order is delivered, before starting assembly. This extra day is required to order components / do kit audit.
Board outline is required for all orders and should be placed on one of your solder mask layers. If there is no solder mask, then place the outline on one of your “working” layers. We allow irregular shapes, but please ensure the board does not have more than 16 edges.
For rounded corners, the radius of the corner must exceed 0.05 in.
NOTE: We reserve the right to cancel orders that have excessively complex routing. Such orders can be accomplished through our Web PCB or custom order systems.
Outline and corners
Cross hatching is not allowed. Many CAD systems leave gaps in fill areas when using 45-degree lines. For NoTouch, you must use 0-degree and/or 90-degree lines to do the fill.
Please make the filled areas using 0.01 in. outlines with 0.001 in. overlap.
Notches are allowed. You can have up to 6 notches, but every notch must be at least 0.1-in. wide. If a notch is less than 0.1 in., our router may ignore your spec and make it our minimum width.
Not offered on our NoTouch product. Please use our Web PCB offering instead, if electrical testing is required.
NoTouch PCBs ship by FedEx or UPS only. You can use your FedEx or UPS account number, if you wish.
Also, Will Calls are allowed for a $15 service charge.
Credit card only
Customer must be careful about accurately doing layer assignment in the online system. Customer must also accurately put in polarity (positive or negative) information for the layers.
See FAQs online for details on how we define positive vs negative polarity for different layers.
All layers must be aligned and NOT mirrored.
The layers should provide a view as though you were looking at it from top straight down to the bottom. To ensure this, we recommend double-checking this through a Gerber viewer; not simply relying on the view from your design software.
Occasionally, we notice a misalignment problem before the board is built, and we may correct it for you. But, generally, it is YOUR responsibility to make sure your layers are aligned correctly and not mirrored.
Note: We put a small 6-digit order # on each board for easy identification during fab process. This will either appear on the top or bottom silkscreen or etched into the bottom copper layer.
Sierra standard stack-ups for 2, 4, and 6-layer NoTouch PCBs.
In our NoTouch PCB service, while we will typically use the constructions shown, we reserve the right to change them at any time without notification. (E.G. within the given overall thickness the dielectric thicknesses may change.)
Only rigid boards. Turnkey Pro service provides both fabrication and full assembly of your boards (including component procurement).
We expect boards to be generally rectangular in shape. Notches, cutouts and slots are allowed (some restrictions shown below).
Boards will be built to IPC-6012 Class 2 – No Coupon Spec. In this online offer, we do not provide any microsection certificates or IPC coupons to customers.
Fabrication of ITAR designated jobs?
Yes, your board can be RoHS if you choose RoHS-compliant surface finish (ENIG). You have an option to not have any RoHS markings on your board if you so choose.
2 layers, 4 layers, 6 layers, 8 layers
Single lamination double-sided or multi-layer boards only. In this online offer, we do not provide boards that need multiple laminations or have HDI features.
High-Density Interconnect (HDI)
No. In this online offer we only provide single lamination PCBs with through-hole vias.
We can manufacture your PCBs that have via-in-pad features. An extra process of non-conductive filling will be done on all vias, to ensure good soldering at assembly. Such vias must be 6 mils or more in size. In Turnkey Pro service, we only offer 7 days, 10 days and 15 days turnkey when your board has via-in-pad features.
Data for PCBs
For PCBs: We prefer RS-274X extended Gerber format. If your file is not in RS-274X, send an aperture file. Please see FAQs below for what files to include.
Data for Assembly
For assembly: You will need to upload your BOM (excel format) online for quoting. In the final package, we will need the assembly drawing and XY data also. See sample BOM format.
5 days, 7 days, 10 days and 15 days
5:00 PM. Day 0 begins when validation is done or the final consigned components are received, whichever is later.
For most designs, any quantity from 2 through 100 assembled PCBs available. Some limitations apply based on the number of panels to be produced and the turntime expected. To enable this service for larger quantities, please contact LoisT@protoexpress.com.
Maximum Board Size
Must fit a 10″ x 16″ box. The area must be less than 150 square inches.
Minimum PCB Dimensions
Maximum PCB Dimensions
FR-4 lead-free (370HR material)
Thickness & Thickness Tolerance
0.062″, 0.031″ or 0.093″ with thickness tolerance of +/- 10%
Arrayed designs are not allowed. Your PCB design must have just a single image of a single board. (Our engineers will array it as needed for Sierra assembly and finally ship you fully-assembled individual boards.)
Standard Copper Overplate
Surface pattern: Nominal 1 oz/sq foot. (0.0013″ to 0.002″) (33 microns to 51 microns)
Outer Layers Copper (Finished)
1 oz or 2 oz (number of ounces of copper per square foot on outer layers.) Specify this as “finished” copper weight. 1 oz. is the most commonly-used finished copper weight. We start with ½ oz foil and plate up to 1 oz. If you specify 2 oz. as your finished copper weight, the minimum trace /space on your board must be at least 6 mils.
Inner Layers Copper
1 oz copper weight on inner layers
Minimum Annular Ring Width
Minimum Air Gap
0.004″ (space between any two copper features)
Minimum Inner Layer Drill-to-Copper Spacing
0.013″ (applies to both plated and non-plated holes)
In this online service, you cannot specify controlled dielectric, but we offer +/-10% controlled impedance (see below).
This means in your design, you are specifying the width of certain traces and spacing to achieve a specific resistance. In your impedance modeling, use the Dk for material 370HR. We expect that, in your fab drawing, you will have an impedance table that CLEARLY identifies the target impedance(s), the layer(s) on which they exist and the specific trace widths/spaces to be controlled. See a sample format for impedance table. Do note that in this online service, our controlled impedance offering has certain limitations: Only offered for boards up to 6 layers only available with +/- 10% tolerance. You can have controlled impedances on up to four different layers on your board. On any layer, you can have up to two different controlled impedances. Our engineers will meet your controlled impedance requirements using our own stack-up. (All we need is your controlled impedance info. We do not need and may not use any specific controlled dielectric information you provide.) If your controlled impedance requirements exceed this spec, please ask for a custom quote.
Multiple Parts in one design
To keep our online service low-priced and hassle-free, we keep it simple. We do not allow different PCB designs and multiple BOMs to be combined in one order. Our system can only accept design files for a single circuit board with a single BOM. We cannot merge BOMs, de-duplicate multiple BOMs, etc.
Green, blue or black
Notches, Cutouts and Slots
Up to 10 plated slots allowed per board. Up to 10 non-plated slots allowed per board. Up to 10 cutouts allowed per board. Up to 10 notches allowed per board. (If any of the above allowances are exceeded in your design, we can still process it for a minimum $100 extra lot charge on your order. We will get your approval before doing so.) Minimum inside radius (for any notch, cutout or slot) = 20 mil (0.02″). Minimum width (of any notch, cutout or slot) = 40 mil (0.04″).
Vendor markings include Company Logo, UL marking, Flammability, etc. Such vendor markings will be put in bottom Silkscreen.
IPC coupons & Microsection reports
Not provided in this online offering. Only available in custom ordered products.
100% net-list testing on every board.
FedEx/UPS, Will Call. You can use your own FedEx/UPS account number. International shipments allowed. All duties/customs are the responsibility of the customer.
Credit card (PO allowed for select customers who have set up credit terms). Payment link convenience: If your purchasing department typically puts in credit card number, you can still place an order and our system will email a payment link to that person. Order will start when payment information is received.
If your board has via-in-pad features, only 7 days, 10 days and 15 days turnkey quotes allowed (you cannot quote for 5 days turnkey). If you want faster turn times, you may use our custom quote service).
Assembly Class Specs
Assembly of ITAR designated jobs?
Assembly on both sides
Minimum Passive Component Size
BGA Minimum Pitch
0.5 mm. BGAs cannot have more than one ball size nor more than one pitch.
Minimum Pitch of Other Components
Maximum number of Through-hole Components
20 per board
Minimum Component Pad Size
Minimum 8 mils x 8 mils or 8-mil diameter
Not allowed in Turnkey Pro Service
Our Turnkey Pro online service provides standard assembly, and has the following limitations: Wire-bonding, conformal coating, underfills, staking, POP assembly, wire assembly, or cable assembly are not allowed. Rework like cutting traces, soldering wire jumpers, and cables onto the boards are not allowed. Assembly of special items like PEM nuts, turrets terminals, rivets, and press-fit connectors are not allowed. (To get any of these extra assembly features, please ask for a custom quote.)