When to Dearte a Transistor

Copied another page on how to derate a transistor into two other pages that used the same derating chart.

2N4237 Temperature-Power Derating Curve, duplicated to.

2N4238 Derating Graph.

2N4239 Derating Graph.

A few other related pages in the section were also updated

2N3498 Derating Graph.

2N2906 Derating Graph.

2N3634 Derating Graph.

Some of these preexisting pages may not have ever been listed out here as new pages, so this may be their first posting. In any case it's yet another external link generated.

There are three different possible guidelines a designer can use when implementing a transistor circuit. 

1. The engineer may use a generic guideline using a simple Derating Factor;

     Example: Derate 50% up to a maximum junction temperature [Derating Factors].

2. The engineer may use a Linear equation which is more a design recommendation;

     Example: Derate Linearly at 12.7mW/ degree C, above 25C [Derating Recommendations].

3. The engineer may use a Temperature-Power Curve which should be treated as a design rule;

     Shown on any number of pages, [Derating Rules].

There were two other pages up-dated to hold the links for the page just generated;

Guideline to Derating Transistors, and Guideline to Derating NPN BJTs.

Addtional related pages on the web site:

Manufacturers of Transistors.

Transistor Amplifier  Circuits.

Transistor Circuit Schematics.

Transistor Multivibrator Circuit Schematics.

Definition of Transistor Terms.

Additional related pages on this blog:

Rules for Derating a Transistor.

Transistor Derating Guidelines.

Recommendation on how to Derate a Transistor.

Derate a BJT by Temperature.

FET Derating Guidelines.

NPN Transistor Derating Curve.

Power Derating for Transistors.

Rules for Derating a Transistor

Following yesterdays transistor posting, I've added two more pages relating to how to derate a particular transistor. Like the previous post the new transistor pages are near a copy of a preexisting page, that happened to use the same derating graph.

MIL-PRF-19500/539D:

2N6301 Temperature-Power Derating Curve [NPN BJT].

2N6300 Temperature-Power Derating Curve [NPN BJT].

MIL-PRF-19500/545G:

2N5153 Temperature-Power Derating Curve [PNP BJT].

2N5151 Temperature-Power Derating Curve [PNP BJT].

Three other page up-dates then followed;

How to Derate Transistors.

How to Derate NPN Transistors.

How to Derate PNP Transistors.

Which were updated to hold the links to the new pages. In addition each new page links to it's copy that holds the same MIL Spec and Derating Graph.

Also added a new line item to the Transistor Derating Recommendations page, which only provide Derating Equations with no Derating Curves.

It may of taken over a hour to generate the page up-dates but it was an easy way to generate two new pages and add more page to page links.In addition four other related pages were updated:

MIL-PRF-19500/396K;

2N3764 Temperature Derating Graph.

2N3765 Temperature Derating Graph.

MIL-PRF-19500/396K;

2N3762 Temperature Derating Graph.

2N3762U4 Temperature Derating Graph.

So in this derating sections there were 10 page up-dates and 2 new page additions. There were also another dozen unrelated page updates.

Guidelines to Component Derating.

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.