Transistor Derating Guide Lines

Added a new page to cover power derating of a 2N3765 transistor. The page is almost a copy of the page for the 2N3764 transistor because they both use the same derating graph. Links have been added to their related transistors covered by the same specifications; 2N3762U4 transistor and 2N3762UA transistor, both surface mount devices. A reference was also added to the page covering PNP transistor curves, and derating transistors.

A few other unrelated pages were also up-dated, including;

Derating a 2N930.

Derating a surface mount 2N930UB.

2N718 derating graph.

2N1613 derating curves.

2N3055 transistor derating curves.

All the pages provide a Temperature-Power Derating Curve, and some also provide a derating equation. Use one or the other as a guideline for derating the device.

Related pages;

Recommendation on how to Derate a Transistor.

Derate a BJT by Temperature.

FET Derating Guidelines.

NPN Transistor Derating Curve.

Power Derating for Transistors.

Industrial Rackmount Computers

As part of the section on how to define an equipment chassis specification, two new pages were added.

The first page covers Industrial Rackmount Computers. The Industrial computers page provides a few design hints and a listing of companies that produce industrial PCs. The original list of industrial PCs had resided on the Manufacturers of PC Chassis page. The PC chassis vendor page now only holds commercial products.

The second new addition covers Cable Carriers or Cable Retractors. A Cable Carrier helps manage cables between the equipment chassis and the chassis rack. Using a cable retractor insures that the cable assembles bends and moves the correct way as a chassis is being moved in and out of a rack. Cable retractors also insure that the cable does not bind on any thing behind the chassis or within the rack. Within a few days the page will also cover Cable Retractor manufacturers.

Also added two more chassis specifications to the chassis standards page. Of course the main page in the section now lists the new page additions. Two new link additions to the section include; Fuse Derating, and Power Supply Standards. Also fixed the link to manufacturers of Anti-Vibration products, which happened to be pointing to the Rack Leveling products page by mistake.

The purpose of the entire section is to show a novice how to design an equipment chassis, or how to write a specification so an OEM could design the chassis. In any case the pages provide many design hints and engineering guidelines as well as some do's and don't s concerning electrical equipment design.

The industrial equipment design section spans 46 pages with links to other relevant topics on the web site. Don't get burned when purchasing an equipment chassis, review the different section that are relevant to the chassis your designing.

The page covering manufacturers of chassis has a link to the top page in this section.

Graphics of AMD Processors

There is a small section of pages that provide Images of AMD Processors located on the web site.

All but a few were added to the site back in 2007, with the newest one added today showing a Quad-Core AMD Opteron Processor Die.

The section only brings in a few hits a day so it's really even worth the bandwidth to display the pic files, but I didn't know that when I first loaded them. Two years later and I would not load them now knowing what I know, but now most of them have a page rank so I have little reason to take them down. Plus the best thing about the section is that those page require little or no maintenance.

The pictures are all copyright by AMD but are free to use as long as their conditions are followed.
Click on the graphic for a larger image..
Graphic Title; Quad-Core AMD Opteron Processor Die

Here is a list of the other pages in the section:

AMD Processor Images

AM2-AMD Athlon 64 FX Dual-Core Processor [PGA]
AMD Athlon 64 X2 Dual-Core Processor
AMD Athlon 64 FX-70 series Processor [LGA]
AMD Athlon 64 FX Processor [PGA]
AMD Athlon 64 X2 Dual-Core Processor
Mobile AMD Athlon XP-M Processor [Processor for Mobile Applications]
AMD Phenom Quad-Core Processor Die
AMD Sempron Processor [PGA]
AMD Turion 64 X2 Dual-Core Mobile [Processor for Mobile Applications]
AMD Opteron processor
Dual-Core AMD Opteron Processor
Quad-Core AMD Opteron Processor [LGA Package]
Quad-Core AMD Opteron Processor Die
AMD Athlon 64 processor for notebooks [Laptop Processor]
AMD Athlon MP processor [PGA CPU]
AMD Geode LX900 1.5W Processor [Embedded Processor]
AMD Geode LX EPIC RDK [Embedded Card]
ATI Radeo Graphics Processor [Expansion Board Processor]
AMD, Socket S1/M690T-SB600 Chipset CCA

The pages add little value to the site, but they are nice to have.

Designing an Equipment Chassis

Two new pages have been added to the section covering How to Design an Electronic Chassis. The section spans about 44 html pages and attempts to cover all the issues when designing an Electronic Equipment Chassis.

The two new pages cover Wire Selection, and AC Power Modules. However; over the same time there have also been a few pages that were up-dated, including; Connector Dust Caps, Slot By-Pass Cards, Chassis Wire Selection, Slot Filler Panels, and a few others.

At any rate, there is now more information in the section that cover more topics in greater detail. There were other pages updated not listed here, but these were the major updates.

The hits to this section are down a bit over the last year, but only by about 50 visits a week, or 200 a month. It could be the reduction in hits is just due to the time of year..... What ever, any way the up-dates will not be seen by Google for several weeks.

The Bounce rate for this section hovers around 60%.

Derating MIL Spec Resistors

The section on how to derate electronic components has now reached about 120 pages. The main location of Device Derating. A few sections go down two or three levels, but most pages reside just two levels down, with about 95 page just added in three months ago [Transistor Derating Curves].

The new pages cover derating curves for MIL Spec resistors. So far the pages do little more than hold a power derating curve, but with all new page additions that will change in a few days.

MIL SPEC Derating Curves:
MIL-R-30095,
MIL-R-39005,
MIL-R-39007,
MIL-R-39008,
MIL-R-39009,
MIL-R-39015,
MIL-R-39017,
MIL-R-55182,
MIL-R-83401,

All of the new pages are liked off the (now) main Resistor Derating page.
Related pages include;
How to Derate Resistor Networks,
Potentiometer Derating Guidelines,
Wire Wound Potentiometer Derating Curves,

Of course all the pages link to vendors that Manufacture Resistors.
Note; the graphics which depict the curves are not the best quality, but the are readable.