Posted Oct 15, 2010, by Tom Hausherr
Component Lead Forms
Before we go deeper into the various component families, we need to clarify the component lead forms of today’s component packaging technology and what is going to be eventually phased out and what is new and why.
The pin (component lead) pitch and the overall body height are continually shrinking. This is why the SSOP and TSOP land pattern names have to be dropped from the standard. … Read More
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library tools,
CAD
Posted Oct 8, 2010, by Tom Hausherr
SOT (Small Outline Transistor) Components
The SOT23 is the most popular of this component family. It has 3, 5, 6 and 8 pin variations and 3 popular pin pitches.
0.50 mm Pitch
0.65 mm Pitch
0.95 mm Pitch
Note: All pictures are shown in the “Nominal Environment” land pattern.
Figure 19 illustrates 0.5 mm pitch SOT23 3-pin and 8-pin examples.
FIGURE 19
0.5 mm pitch SOT23 fanout … Read More
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CAD
Posted Oct 1, 2010, by Tom Hausherr
Molded Body Components
The next most popular component family on a PCB design layout is the Molded Body Tantalum Capacitor (CAPM). The CAPM components have an “L-Bend” component lead form. Most Molded Body Tantalum Capacitors are metric by default including their standard EIA names –
3216 – 3.2 mm X 1.6 mm
6032 – 6.0 mm X 3.2 mm
7243 - 7.2 mm X 4.3 mm
7343 – 7.3 mm X 4.3 mm
The … Read More
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library tools,
CAD,
CAD Library
Posted Sep 22, 2010, by Tom Hausherr
Chip Components Smaller Than 1608 (EIA 0603)
Before you read this blog ‘Part 2″, read Part 1 White Paper of this series - “PCB Design Perfection Starts in the CAD Library” for the introduction information. Download it here - http://www.mentor.com/products/pcb-system-design/techpubs/download?id=60454
Parts 3, 4, 5 etc. will be posted here over the next couple weeks. I’m really looking forward to … Read More
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library tools,
CAD
