Turnkey Pro: Sierra Circuits' Quickturn PCB Assembly Service


Turnkey Pro's quickturn assembly services capabilities include fabricating your printed circuit board, procuring components and assembling the board. Full Turnkey at your fingertips!


See tables below showing the PCB and Assembly specs allowed for Sierra's quickturn assembly service- Turnkey Pro. We estimate that more than 80% of the PCBs ordered in the world today fit into these specs! If you have any questions or have specs outside the Turnkey Pro capabilities, try our
Web PCB service, or our Custom Quoting service, or reach out to us via chat or email.

PCB Specs for Turnkey Pro

If your PCB design does not conform to standard PCB specs below, please try our Web PCB service- more materials, more finishes, more options.
Compare Turnkey Pro to WebPCB and choose what is right for you.
Board Type Only Rigid
Board Shape We expect boards to be generally Rectangular in shape. Notches, Cutouts and Slots are allowed (some restrictions shown below)!
Board Spec Boards will be built to IPC-6012 Class 2 Spec.
However, in this online offer, we do not provide any Micro-section certificates or IPC coupons to customers.
Fabrication of ITAR designated jobs? No
RoHS Available? Yes, your board can be RoHS if you choose RoHS-compliant surface finishes (ENIG or Lead-free HASL) You have an option to not have any RoHS markings on your board if you so choose.
Layers Allowed 2 Layers, 4 Layers, 6 layers, 8 Layers
Laminations Single lamination double-sided or multi-layer boards only. In this online offer, we do not provide boards that need multiple lams or have HDI features.
Blind Vias No
Buried Vias No
High-Density Interconnect (HDI) No. In this online offer we only provide single lamination PCBs with through-hole vias.
Non-plated Holes Yes
Via-in-Pads 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 FAQ 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 Assembly Drawing and XY data also. See sample BOM format.
Turnkey Turntimes 5 days, 7 days, 10 days and 15 days
Cut-off Time 5:00 PM. Day 0 begins when validation is done or the final consigned components are received, whichever is later
Order Quantities For most designs, any quantity from 2 thru 100 Assembled PCBs available. Some limitations apply based on number of panels to be produced and turntime expected.
To enable this service for larger quantities, please contact LoisT@protoexpress.com
Maximum Board Size Must fit a 10" x 16" box. Area must be less than 150 square inches
Minimum PCB Dimensions .5"
Maximum PCB Dimensions 15.9"
Material FR-4 Lead-free (370HR material)
Thickness & Thickness Tolerance 0.062", 0.031" or 0.093" with thickness tolerance of +/- 10%
Arrays 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)
Minimum Trace/Space 4 mils
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 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 0.5 oz. or 1 oz.
Plating on Hole Walls About 0.0008" (20 microns)
Surface Finish Three surface finish options: HASL, ENIG (RoHS compliant), or Lead-free HASL (RoHS compliant)
No special features Special features like Blind/Buried vias, Gold fingers, counter bores, counter sinks, edge plating, milled edges are not allowed
Standard Gold Thickness Gold thickness       1.5 - 2.8 µin (0.038µ - 0.0711µ)
Nickel thickness    125 µin - 250 µin
Minimum Hole Size 6 mil (.006")
Maximum Hole Size -- Finished 0.246"
Maximum Hole Size -- Non-plated 0.250"
Maximum Hole Density 80 Holes/square inch
Minimum Annular Ring Width 0.006"
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)
Controlled Dielectric In this online service, you cannot specify controlled dielectric, but we offer +/-10% controlled impedance (see below)
Controlled Impedance 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 a 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 4 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 stackup.
    (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.
Soldermask Green, Blue or Black
Legend/ Silkscreen White
Notches, Cutouts and Slots Up to 3 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")
Logo Logo & UL Markings: We will put UL marking for any FR4 material jobs ordered through Turnkey Pro service.
The Sierra Circuits logo is generally applied on all PCBs and it is on silkscreen/legend. If your PCBs do not
have silkscreen/legend, then the Sierra logo may be put in copper.
With Turnkey Pro, we also provide an option to not have any Logos or UL markings, if you so choose.
IPC coupons & Microsection reports Not provided in this online offering. Only available in custom ordered products.
Electrical Testing 100% Net-list Testing on every board
Shipping Options FedEx/UPS, Will Call. You can use your own FedEx/UPS Account number. International Shipments allowed. All duties/customs are responsibility of the customer
Payment Terms 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.
Restrictions 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)
If your PCB design does not conform to standard PCB specs above, please try our Web PCB service- more materials, more finishes, more options.
Compare Turnkey Pro to WebPCB and choose what is right for you.

Assembly Specs for Turnkey Pro

Assembly Class Specs IPC-A-610-Class2
Assembly of ITAR designated jobs? No
Assembly on both sides Yes
Minimum Passive Component Size 0201 (inches)
BGA Minimum Pitch 0.5 mm. BGAs cannot have more than one ball size nor more than one pitch
Minimum Pitch of Other Components 0.4 mm
Maximum number of Through-hole Components 20 per board
Minimum Component Pad Size Minimum 8 mil x 8 mil or 8 mil diameter
Not allowed in Turnkey Pro Service Our Turnkey Pro online service provides standard assembly, and has 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)
If you have more complex Assembly needs (say, IPC-A-610-Class 3, or with special processes like wire-bonding, etc.) which does not conform to standard assembly specs above, please get a Custom Quote.
Talk to a Quickturn Assembly specialist today! We'd love to answer your questions.