NPN Transistor Derating Curve

In addition to adding more pages covering Transistor Derating Guidelines, two new pages were added to subdivide the listing.

One page covers NPN Transistor Derating Guidelines, while another page covers PNP Transistor Derating Guidelines. The new pages show each transistor link shown in a derating chart, even if the link points to a simular page already listed. One Temperature-Power Derating Curve may cover more than one transistor.

Power Derating for Transistors

Added two new main sections over the last few days, both of which come under the heading of Component Derating.

The first section covers Diode Temperature Derating Charts and is linked off the Diode Derating Guide Lines page. The new section covers six new pages, I won't re-list them here.

The second section covers Transistor Temperature Derating Charts and is linked off the main Component Derating page, which had not covered Transistors previously. The Transistor Derating Charts contain 27 new pages. Again, no need to relist all those pages address here.

A number of new graphic files were also added over the last few days, but I don't track those. So around 32 new pages have been added to the web site in the last few days.

All devices have a maximum current rating or power dissipation at 25C, but as the ambient air temperature is increased that maximum power dissipation must be reduced or derated.

Mini DisplayPort Specification

Apple Computer released the Mini DisplayPort standard in October of 2008. The new standard is very similar to the DispalyPort specification that was released by VESA in 2007. The new standard is controlled by Apple and differs from the original DisplayPort standard in a number of way, including a smaller connector and a different pinout.

Currently only the DisplayPort page links to the Mini DisplayPort page. With the link missing from the Video Monitor Buses page, the PC Interfaces Bus page, and a number of other computer bus related pages.

Only Apple uses the Mini DisplayPort interface....

Lithium-ion Batteries

Added a new page to hold some data on Lithium-ion Batteries. It holds a short description, and then some standard sizes and styles. The page is linked off the main page of Battery manufacturers.

Additional pages on this topic include Industrial Battery manufacturers, and manufacturers of Battery Sockets.

Battery Control IC Manufacturers.
Battery Management Buses; SMbus, and I2C Bus.

USB 3.0 Specification Release

A description of the Universal Serial Bus [USB] has resided on the site for years now. That page dealt with revisions 1 and revisions 2.0. However the specification changes within revision 3.0 are so different a new page has been created; Super Speed USB.

Revision 2.0 of the USB specification operated up to 480Mbps, while revision 3.0 of the standard can operate up to 4.8Gbps a 10x increase in the operational data rate. The cable and connectors have also changed by adding two additional twisted wire pairs.

The new page is still a copy of the original USB but over the next few days the 2.0 data will be replaced by the 3.0 information. Also added a new page to hold the new 3.0 USB Cable diagram, but again it's still a copy of the revision 2.0 cable.

Related pages:
Wireless USB,
VoIP Phone Manufacturers, USB Phones,
USB HSIC Interface,
Inter-Chip USB Interface,
Micro-USB Interface.