Sick of Beige standard PCB sizes v1.0

From DP

Revision as of 09:33, 3 May 2012

Overview

Are you sick of beige project boxes that hide your cool board and hard work? Wouldn't it be cool if your project was case ready from the first revision?

We worked with case designer David Moberly to create a case-friendly PCB footprint for our projects. We call the specification Sick of Beige v1.0. Just drop the PCB symbol from our Eagle library on a schematic to get a board with nice rounded edges, mounting holes, and recommendations for connector placement.

The PCB templates come in two shapes, sized to fit the free version of Eagle and the various inexpensive PCB services[link to how to]. Read on for the full specification, or grab the library and get started with standard boards today.

• Cadsoft Eagle library (All parts including footprints)
• Cadsoft Eagle library (PCB footprints only)
• Sick of Beige forum

SoB v1.0 at a glance

Designing for cases is never easy, but the standardized footprints take the effort out of following these recommendations.

Key values

• 3.2mm mounting holes, 4mm from center of hole to edge of PCB
• PCBs have 4mm corner radius
• We recommend minimum 6mm keepout around mounting hole to leave room for the standoffs
• We recommend minimum 1.7mm edge keepout for case clearance

DP Standard Board Keepouts and restricts

• a 1.7mm width 39 tkeepout and 40 bkeepout around the board edges
• a 3mm radius 41 tRestrict and 42 bRestrict with its center on each 4 holes
• a crosshair like centerline for the board in 49 Reference layer
• a usb center for the major axis of the board in 49 Reference layer at 5.25mm from edge
• board name on the back 26 bNames e.g. DP6037 (lower right), 1.27mm size, 12% ratio

Other notes for case designers

• we see PCB widths vary up to +0.4mm, and recommend you design for up to +0.4mm of extra PCB in both directions

List of sizes

Square boards range from 30mm to 80mm in 10mm increments. Bigger sizes are certainly possible, but we're working with the free version of Eagle in mind.

Rectangular boards use the golden ratio to determine the short side. DP10080 is not a Golden ratio rectangle, but the maximum Cadsoft Eagle PCB size allowed for users with a free license.

• List in PDF format.

Hardware

Hole dimensions and locations

Holes are located in the 4 corners exactly 4mm from the closest vertical, and horizontal edge. They are 3.2mm in diameter.

Cooper keep-out area

Around each hole there is a cooper keep-out area approximately 5mm from the center of the hole. In this area no traces, or ground fills are aplicable, to avoid contact with metallic standoffs,and screws.

Component placement keep-off area

No component may be placed 1.7mm from an edge of the board. this is for posible future cases that hold the PCB by the edges

Board's round corners

Each corner of the board is rounded with an arc 4mm in radius.

Reference points and lines

Runing through the exact middle, both lengthwise, and lengthwise, is a reference line. Also added are two reference point for USB mini-B jack, 5.25mm for the left and right edges.