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4 Layer Special

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Only supports a few types. Maximum file size: 500 MB

Product Description

Get 3 multilayer printed circuit boards, up to 50 square inches per board, for $60 each. Shipped within 5 business days following the date the order is placed, these 4-layer boards are a great, inexpensive option for basic, professional prototyping.

Interested in a stencil to help with parts assembly? Check out our desktop stencil option here.

Not finding what you're looking for? We'll generate a custom quote for you. Click here to get started!

Manufacturing Specifications

Quantity 3
Layers 4
Lead Time 5 Business Days. To learn more about how lead time is calculated, read this.
Maximum Board Size Up to 50 square inches per board (for this specific offer). Maximum board dimension is 22.5 inches (maximum manufacturing capability).
Minimum Board Size Minimum dimension in height or width is 0.35 inches. Total board area must be greater than 0.4 square inches (i.e. smallest square board allowed is 0.64 x 0.64 inches).
Minimum Trace and Space Etching resolution is 0.005” minimum trace width, 0.005” minimum space width.
Inner Layers The two inner layers may be solid copper planes, signal layers, or a mix of solid copper and signal traces. Through-hole pads can either be connected to or isolated from these layers. It’s recommended that the inner layers have roughly the same distribution of copper features to prevent warpage. The planes are inset 0.025” from each edge of the board.
Soldermask Color = Green. Top and Bottom
Silkscreen Color = White. Top and Bottom
Surface Finish HASL (Lead). Learn more about Surface Finishes.
Soldermask Pad Tolerance Pads on the soldermask layers are grown by 0.003” on all sides. As a result, very fine pitch surface mount components may not include any soldermask between the pins.
Material Dielectric material is FR-4 with a glass transition temperature of 180 degrees Celsius. Inner layer copper is 1 ounce (0.0014") thick. Outer layers begin with 0.5 ounces of copper, then during through hole plating, up to 1 ounce of copper may be added to the outer layers. Thus, the total outer layer copper is between 0.0017" and 0.0021". The total board thickness will be 0.062".
Dielectric Constant The dielectric spacing between the top layer and the first inner layer is 0.008” with a dielectric constant of 4.2 +/-0.2. The dielectric spacing between the bottom layer and the second inner layer in 0.008” with a dielectric constant of 4.2 +/-0.2. The dielectric spacing between the inner layers in 0.040” with a dielectric constant of 4.2 +/-0.2.
Annular Ring Minimum annular ring must be at 0.005” or greater.  Calculate annular ring by subtracting the diameter of the via hole from the diameter of the via pad and dividing by two.
Plated Holes Boards are manufactured with 4 copper layers. All holes with copper pads on the top and bottom are plated through, while holes without a copper pad on the top or bottom layer are non-plated. Holes with a copper pad on one outer layer but not on the other are not accepted.
Hole Sizes & Quantity All hole sizes between and including 0.010” and 0.247” are available, up to tolerance. Non-plated holes may be any size. Limit number of holes to less than 50 per square inch.
Hole Tolerance These sizes are the finished hole diameters after plating. Holes 0.014” or smaller may be filled with solder and can only be used as via. The tolerance of 0.015” to 0.020” holes is +0.003 / -0.005. The tolerance for the other hole sizes are +/-0.003”.
Hole Location Tolerance Hole location tolerance is +/-0.003”.
Minimum Hole Distance The distance between plated holes of different nets is dictated by annular rings and trace/space. Plated holes of the same net and non-plated holes should be at least 0.005” apart.
Internal Slots and Cutouts Not Allowed
Perimeter Slots Board perimeters are cut to shape using a 0.078” router bit. Slots in the perimeter must be 0.100” or wider. Narrower slots may not be cut correctly.
Perimeter Routing The edges of the board are cut with an accuracy of +/-0.010”. A minimum of 0.020” blank space is recommended between the perimeter and all features on the board. Copper features, vias, and any other design element placed closer than 0.010” to the board’s edge may be routed off.
Temperature All boards can survive standard reflow, while RoHS compliant boards are able to survive RoHS reflow. The maximum operating temperature is 125 degrees C.
Electrical Test Optional
Other Arrays (Tab Rout, Breakaway Tabs, Mouse Bites, etc), Beveled Edges, Blind/Buried Vias, Castellated Edges, Countersinks/Counterbores, Controlled Impedance, Edge Plating, and Scoring are NOT available with this product option. When required, please request a custom quote here.

Additional Resources

Design Rules Our standard design rules and standards assist PCB Designers with configuring basic design rule checks. Available Here
DFM Report Upload your PCB design files and receive an instant Design for Manufacturability (DFM) report. Our free, automated tool identifies possible production issues prior to manufacturing. Available Here
PCB Design Software PCB Creator is a free, easy-to-use PCB design software allowing for the design of 2 and 4 layer PCBs. Available Here
Online Tools We offer a variety of free online tools to assist you in the PCB design and manufacturing process including an Array Calculator, a Panelizer Tool, Material Library, Surface Finish Chart & More. Available Here
Blog Follow our Blog for helpful posts on PCB design. Available Here
Help Center Questions? Check our Help Center for self-service answers to common questions, or Submit a Request and we’ll be glad to help out! Available Here

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Product Reviews

Showing reviews 1-5 of 12 | Next

  1. On time, every time. 5 Star Review

    Posted by on 6th Aug 2020

    One of the worst situations is having to tell the client, I'm sorry, but your project has been delayed. It doesn't matter what the reason, you are the one the client looks to for prompt delivery.

    I have never had a delay when I have used the services of Bay Area Circuits. I know I can count on them.

  2. Four Layer For Sure! 5 Star Review

    Posted by on 25th May 2019

    Quality, price, personal satisfaction, excellent Business Communiqué, expertise in product fulfillment, and knowledge based production standards.
    Thanks for finding and alerting me to artwork shortcomings on my part. Not to mention that at no extra charge, The correction was made possible, and not a minute lost getting the product shipped out.
    Thanks Bay Area Circuits!


    Timothy A Maloney

  3. Excellent low cost option 5 Star Review

    Posted by on 16th Nov 2017

    Excellent for 4-layer prototypes if you can wait 6 business days. Functionality and workmanship are flawless.

  4. Great product, quick turn around 4 Star Review

    Posted by on 9th Nov 2017

    Accurate product, quick turn around, great pad finish.

  5. Good quality - easy to work with. 4 Star Review

    Posted by on 31st Jul 2017

    Good PCB Quality. They were de-paneled cleanly, which is a plus.

    Customer service is impeccable, and they have been helpful in working through the process of scaling production up.

    Only complaint: on one board, two vias will ever-so-slightly connected to a ground plane. Minor problem compared to the support & service BAC provides.

Showing reviews 1-5 of 12 | Next