Trusted by Innovators

Engineers and PCB designers at the world's most innovative companies choose Sierra Circuits for top quality turnkey PCBs.

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5-step process for an instant quote. True 5-day turnaround for Turnkey PCBs.

Why use Turnkey Pro by Sierra Circuits?

Manage your order entirely online! Turnkey Pro is our self-service platform that allows you to get your standard technology PCBs fully assembled in as fast as 5 days. Start by uploading your BOM to get an instant quote for fabrication, assembly, and components.

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Highly Trusted

Turnkey Pro is trusted by the nation's brightest PCB designers & engineers.

Our customers include NASA, Space-X, Oculus, Amazon, Apple, MIT, Stanford, & Carnegie Mellon.

Made in the USA

Sierra Circuits is a privately held, woman- and minority-owned shop.

We FABRICATE and ASSEMBLE your custom PCBs in our state-of-the-art facilities located in Silicon Valley.

Competitive Pricing

Upload your BOM and get an instant quote for fabrication, assembly, and components.

Turnkey Pro provides fast & efficient pricing with no hidden costs!

End-to-End Process

Turnkey Pro creates an unbroken thread from design to delivery.

Receive a complete quote for fabrication, assembly and components entirely online!

Reduce Re-Spins with our Zero Defect Guarantee.

Turnkey Pro sources the whole package, creating a thread from design to delivery. Fabricating PCBs. Procuring parts. Assembling your boards.

Once you upload your BOM, Turnkey Pro's best-in-class software automatically checks for errors and cleans your file for you. After you place an order, your dedicated CAM engineer will run a full DFM and DFA check to ensure your prototype acheives Zero Defect every time­­—all at no additional cost to you.

Get to market faster and spend less time troubleshooting.

Turnkey Pro automatically...

... Verifies component part numbers.

... Identifies errors and offers solutions.

... Procures and prices required components.

Trusted by Leading Research Institutions

Frequently Asked Questions

Here is a brief list of the specs and capabilities to give you an idea of what Turnkey Pro can deliver for your prototype.

  • IPC-6012 Class 2 - No Coupon PCB and IPC-A-610-Class2 Assembly
  • RoHS and non-RoHS options
  • Down to 0.004" trace and space, 0.006" hole size
  • Lead-free FR4 370HR material
  • ENIG, HASL, surface finishes
  • SMT and Through-hole assembly
  • Can assemble components with 0.4 mm pitch

Board Type Only rigid boards. Turnkey Pro service provides both fabrication and full assembly of your boards (including component procurement).

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 microsection 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 finish (ENIG). 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 laminations 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 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.

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 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

Maximum Board Size Must fit a 10″ x 16″ box. The 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 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

Maximum Number of Holes Per Board 80 holes/square inch

Minimum Annular Ring Width 0.006″

Minimum Air Gap 0.004″ (space between any two copper features)

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 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.

Soldermask Green, blue or black.

Legend / Silkscreen White.

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″).

Logo Vendor markings include Company Logo, UL marking, Flammability, etc. Such vendor markings will be put in Silkscreen.

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 the 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).

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 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.)

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.

  1. Upload your BOM and our team will check for errors and clean it for you! You can even save and download it.
  2. Get upfront component engineering assistance while we pull live inventory from Digi-Key, Mouser and Coilcraft.
  3. Get an immediate quote on parts, fabrication and assembly in minutes! Select 5, 7 or 10 days turntimes with corresponding labor cost. Order in the moment or save your quote for later date.
  4. Sit back and relax while your boards are being made. Any issues that arise can be accessed swiftly and directly in the customer portal. It's easy to check the progress and notify your team.

Boards will be built to IPC-6012 Class 2 Spec. However, in this online offer, we do not provide any microsection certificates or IPC coupons to customers.

Our team of experienced engineers check and double-check your files before production.

If our engineers find any issues during DFM and DFA checks, we will publish them to your project folder in your customer portal. You can resolve issues directly within the portal!

Sierra Circuits turnkey PCBs are engineered to meet our customers' most critical requirements. Our material is manufactured to strict process controls that will give you world-class quality and uncompromising consistency.

Sierra Circuits warrants its boards against defects in materials and workmanship under normal use for a period of 90 days from date of shipment. If a defect arises we will either (I) replace the board at no charge or (II) issue a credit equal to the original purchase price of the board.

Click here for more details.

Need Military-Spec or Aerospace boards? High-Density Interconnect boards? Flex and Rigid-Flex boards?

Advanced PCB Fabrication    Flex & Rigid-Flex PCB

Microelectronics PCB    Mil-spec & Aerospace PCB


Sierra Circuits offers these sought-after capabilities:

  • Laser microvias, blind and buried vias
  • Fine lines and spaces
  • Sequential lamination
  • Via-in-pad technology
  • Microelectronic circuit boards
  • Fine pitch devices down to 200 microns
  • Thin build-up materials

Sierra Circuits delivers HDI PCBs to these high-end industries:

  • Automotive
  • Semiconductor test equipment
  • Medical electronic device
  • Mobile
  • Computing
  • Aerospace and defense

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