Chassis Mount Power Resistor

As part of the page covering How to Dearte a MIL-PRF-39009 Resistor, a new page was added to cover mounting area. The original MIL-39009 resistor page covered power dissipation vs ambient temperature, which is what most of the Component Dearting pages cover. More specifically output power by temperature is normally How Resistors are Derated.

This new page covers Derating MIL-PRF-39009 Resistors by Mounting Area. Or available power dissipation in watts compared to the area of the chassis the resistor is mounted to. This style of resistor is designed to be mounted to a metal surface to aid in dissipating power. So this is one of the few styles of resistors that shows a dearting chart that uses something other than ambient temperature. Although the original page does provide power dissipation vs temperature, the chart covering chassis mounting area is not related ~ use one chart or the other for derating purposes.

For reference here is another chart for Dearting a Variable Wire-Wound Resistor, and another for Derating Resistor Networks. But visiting any of these page links will show all the other styles or package options used and their derating charts. Most of the pages in this section have all the same page-to-page links.

Graphic: 

MIL-PRF-39009 Chassis-Mount Power Resistor

Resistor Networks

I went a head and added another page for a 20-pin Resistor Network. I added the link  to a number of pages in that section, so many of those pages got updated. A 20 pin through-hole DIP seems like a pretty big package for the termination the package offers, but I guess if you have the board space.... Seems like the BGA package added the other day would be a better alternative. But of course the resistor arrangement is different, at least for the example provided.

I don't know what the application is for because the resistors seem like odd values, but there must be some common usage otherwise they wouldn't make it.

So any way it looks to be about 17 pages in this section, at least with the page address starting with resistor-network. All together they bring in a few visitors to the site, and most of the pages have a 50% bounce rate.

Resistor Array BGA Package

A new page was just added to cover a BGA Resistor Array. The new Resistor Array is linked off the main Resistor Network page, which really covers a resistor network in a 16-pin DIP. I also added a link off the page covering Resistor Array Manufacturers, cause it seems like many of the other resistor network links are on that page.

I also added the page link to the SiteMap for the web site too.

None of these pages covering this topic are doing well. It could just be there is not a lot of search traffic for resistor network packages.

Looks like the last time I added a page to this topic was on Jan 12, as Resistor Networks. Then on Dec 3 as a DLCC Resistor Array. I've been slowly been added to this topic over the last few months.

I also up-dated the new Google search bar, if you happen to be following the other blog. The site search should work the same but the search bar looks a little different.

Resistor Networks

Just added a new page to cover 6-pin LCC Resistor Networks. Yet another page showing a schematic and package style of a resistor network. Currently the page is linked off the 16-pin LCC Resistor Network page.
The new page is a Dual-row LCC package, while the current page is a Quad LCC package. However there is a page that covers a Dual-row 16-pin DLCC Resistor Network, but with no new link yet.
The Resistor Dictionary page the covers the term; Resistor Network Definition.

Looks like the page doing the worst is 8-pin SIP Resistor Network (non-standard connections). With a few page views and no page rank.
I may be able to add the link for the new page to the other related pages in this section.
Graphic; Dual Row Resistor Package.

Panel Mount Resistors

Looks like the small section relating to Resistor Definitions contains about 15 pages now. Really a few more pages, but using different page addresses so I don't see them in my Analytics filter just now. The newest page is linked off the definition of Panel Mount Resistor, as Panel Mount Adjustment Resistors.

The thing I just noticed from the page view data is that the last new page added a few weeks ago on
Resistor Encapsulation has received no page views; added off the page, Damping Resistor.

So what I did was add a short definition of a panel mount resistor, and then added more data and some graphics on a new page; the difference between a paper dictionary and an HTML based dictionary of terms.

I did want to mention that among all the other pages relating to resistors, a number of pages were added that cover Resistor Networks, but they were added under a different section. So there are more than 15 pages in this section, I'm just not counting them here.

SEO hint; it took 7 months before this section received more than 100 page views in a month [from March 1 2008].

Graphic; Metal Shell, Panel Mount, Potentiometer.

Resistor Definitions

Off one of the Resistor Dictionary pages; Damping Resistor. A new page was added to cover the term Encapsulation of a Resistor. It ended up on its own page just because the size of the graphic.

At this point there are a number of pages that cover different resistor topics. Here are a few with the lowest page views this year [should be all new page additions]:

8-pin SIP Resistor Networks [un-common].
8-pin SIP Resistor Networks [also un-common].
I've never seen either of these resistor configuration in those SIP packages, but that doesn't mean some one may need them one day.

20-pin LCC Resistor Network Schematics.
SIP Dual Termination Resistor Networks.

Those four pages were some what new, here's a few older pages with no page rank.
MIL-R-39015 Resistor Derating. [Wire-Wound]
MIL-R-83401 Resistor Network Derating.
MIL-R-55182 Resistor Derator Curve.
There's a few more than that, but I'm not really sure why they do not have a page rank.
Looks like the pages have a number of internal links from other pages about Resistor, but no external links. However I just checked they are listed in the site map, but that sitemap may be to large a file for Google to read [they like 100 links or less a page].
There are a few other resistor graphics I have but I don't think I'll get them in by the end of the year. Looks like there's around 50 pages that relate to resistor issues.
Not sure why but the Current Sense Resistors page didn't show very high in a search.
Graphic 16 pin Gull-Wing Surface Mount Package [used with resistor networks].

Surface-mount Trimmer Resistor Packages

To support the page on Through-hole Trimmer Packages, I added a new page to cover Surface-Mount Trimmer Packages.
Both pages use the links to Resistor Terms at the top of the page; As in these definitions:
Adjustable Resistor.
Lead-Screw Resistor.
Non-Wire Wound Resistor.
Potentiometer.
Reostat.
Trimmer Resistor.
Variable Resistor.
The page covering companies that Manufacturer Potentiometers works off the link. There also also links to Derating Potentiometers, and Wire-Wound Potentimeter Derating. There are dozens of other pages relating to resistors and Trimmers.
A Trimmer is a variable resistor that is produce that only supports a full adjustments, a trimmer is not made to handle continuous adjustments or changes. Each of those two pages show four or five different examples of package styles.

Graphic; Variable Resistor, Wire-Wound Derating Curve [MIL-R-39015].

Types of Resistor Trimmer Packages

To complement the page covering Potentiometer manufacturers, a link was added to cover Trimmer Packages. So far it just has a few graphics of Trim Pots, through-hole packages. The page is also linked off the Trimmer Definition page. Reference Potentiometer Definition, or here; Potentiometer. Looks like there is a small one for Variable Resistor.

I'll add another page to cover a few surface mount packages soon.

Looks like there's a page for Potentiometer derating, but not one for how to derate a trimmer.

Graphic; 4mm square surface mount gull wing trimmer.

Dual Leadless Chip Carrier Resistor Array

Yet another page was added to the group of resistor packages; this one is in a 16-pin DLCC package; linked off the 16-pin LLCC package.

Graphic; Resistor Array xN package.

Non-Standard Resistor Networks

Following yesterdays posting for a non standard SIP configuration; 6-pin SIP nonstandard Network, I added two new pages. I added them just to add the schematics, because I really don't know what application they might be used for ~ but that doesn't mean I shouldn't have them on interfacebus. At the same time I updated many of those pages related to resistor PACs;  20-pin LCC Resistor Network, and the 16-pin LCC Resistor Networks and others.

So any way I added two new pages both showing non-standard resistor pin outs in an 8-pin Single Inline Package:
Non-Standard Resistor Networks.
Uncommon Resistor Networks.
Guess I'm getting to the point I need to add an upper level page to link to all these new related additions.

Of course it's not all about adding new pages; this month the site received over 80 new graphics, on at least that many pages. In addition; my computer indicates over 500 pages were updated, to some degree. However many page up-dates may have been an HTML update being made to a number of pages.
It would seem that over 30 new pages were added this month, out of that 500 page update.

So 500 page updates, of which 30 were new pages, with some 80 new pic files. Of course this blog normally only indicates new page additions and not new pick files or updates.

Graphic; 8 pin SIP Resistor Network.

SIP Resistor Networks

To follow yesterdays posting on Resistor Networks, a new page(s) was added to cover SIP Resistor Networks. Same schematics as before but now the pin outs match either a;
6-pin SIP Resistor Network,
8-pin SIP Resistor Network,
10-pin SIP Resistor Network.
This time the components are divided by schematic and not package. So, for example, the bused resistor network is shown on one page, with pinouts for each of the SIP layouts;
SIP Bused Resistor Network. [Common Tie point]
SIP Isolated Resistor Network. [Individual Components]
SIP Dual Termination Resistor Network. [Thevenin]
Looks like there are two general styles of packaging. A molded package and a conformal coated version. The page on SIP Packages shows both package styles.

I also just added a few other pages; one for Non-standard resistors in a 6-pin SIP, and one for a 14-pin DIP Resistor Network. They were all uploaded about an hour ago, but I have to many 'in-work' pages so I'll go ahead and stop for now.  I may go ahead and update them again, but will not add any other related pages today. Five new pages works......

Graphic; 8 pin through-hole Single In-line Package [SIP] used with Resistor Networks.

What are the different types of Resistor Networks

Had a page out on interfacebus showing a few different schematic diagrams of both Resistor Array and Resistor Networks in a 16 pin Dual In-line Package [DIP]. The page also linked to RC Networks in a 16-pin DIP, and a page which showed the Passive DIP components. Also have a page covering Derating Resistor Networks.

Anyway I added a new page to cover Resistor Networks in a 20-pin Leadless Chip Carrier [LLCC], or 20-pin LLCC Resistor Networks. I then added one to cover 16-pin LLCC Resistor Networks.  I think most of the text is all the same on each of the pages. All the schematics are the same, except for the pin out and the packages so why wouldn't the text be the same.

I just noticed that the dual-resistor termination package in a 16-pin LLCC case only has seven termination resistors, what bus uses just 7 bits of data? Same thing with the common-pin package which only has 15 resistors.

So now there's a page for 16-pin DIPs, a 16-pin LCC and a 20-pin LCC package each with three different styles of resistor interconnections.

Design hint. Resistor Networks are great because they save a lot of board space, but there are problems with these components.
First noise is easily passed from one resistor to the next because they are all in the same package.
Secondly, one resistor [in the package] my be located in the correct spot on the PWB, but in many cases all other traces need to be routed out of their way to reach the resistor package. Individual resistor packages can be placed in the exact location required, resistor networks can not. This may not matter in low speed systems but in high speed networks trace distance does matter.

Graphic; Resistor Array, 16-pin Lead-Less Chip Carrier, 8-resistors, no common connection.

Resistor Attenuators

I added a new page to cover schematics of different styles of Resistor Attenuator Networks. The page should support the section of Resistor Terms and Resistor Attenuator Manufacturers.

Normally these devices will be surface mount components so the common term will be Chip Attenuator. The new page shows schematics for the Pi attenuator, T attenuator, and L attenuator.

Terms used with Resistors

A dictionary of Resistor Terms was started back in 4/08 and consisted of 10 pages [Blog entree; Resistor Definitions] A few months later the 'B/C' page was broken into two separate pages 2/09 [Blog entree; Dictionary of Resistor Terms]. Some time later the 'O' page was added.

Yesterday, yet another page was added by separating the 'F-M' into 'F-L' and 'M' pages. Here are the current pages, listed by the first definition on each page:
Active Resistor. 'A' Terms
Ballast Resistor. 'B' Terms
Carbon Film Resistor. 'C' Terms
Damping Resistor. 'D-E' Terms
Ferrule-terminal Resistor. 'F-L' Terms
Maximum Voltage Rating. 'M' Terms ......... This is the new page that was added
Network. 'N' Terms
Ohm. 'O' Terms
Phenolic Molded Resistor. 'P' Terms
Rated Continuous Working Voltage. 'R' Terms
Semiconductor Resistor. 'S' Terms
Tab Mounted Resistor. 'T' Terms
Variable Resistor. 'V-Z' Terms

There are also a number of side pages detailing Resistor design;
Resistor Tolerance definition.
Resistor Values - Package Sizes.
How to Derate a Resistor.

There are a number of others, but this off-site pages lists many of them: Resistor Products.
Hits to the resistor dictionary really didn't start to pick up until January of this year.

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.

Dictionary of Resistor Terms

There are 11 pages on interface bus that form a short dictionary of resistor terms. The resistor dictionary is only part of a few dozen pages that cover resistor topics, I list a few below.

Any way, I try to keep the page sizes small so they up-load fast. Because of that I divided up the B/C page into a page that cover 'B' resistor terms and 'C' resistor terms. Most pages in the group still show the B/C page, but once the 'B' page is found, the 'C' page shows up. I'll fix the other pages in the next few days.

Blog Pages;
Looks like the last new page was added in April 12th; Resistor Network Schematic.
The Resistor Definition section was added on April 11th; Resistor Definitions.
Then on April 4th; Resistor Tolerance.
February 19th; Resistor Chip Attenuator Manufacturers.
February 18th; Current Sense Resistor Manufacturers.


So I've listed pages that link to Resistor Topics and not the links to the individual pages.
The graphic used is a SIP package, as in SIP Resistor component.

Resistor Network Schematic

Added a new page providing a schematic of Network Resistors. This page shows the pinout and schematic for two types of resistor arrays. This is in addition to a previous page showing Resistor Networks. The page compliments the Resistor Network Packages page, the Manufacturers of Resistor Networks, and How to Derate Resistor Networks.

A page showing How to Derate Thermistors was also added, complimenting to the page providing Manufacturers of Thermistors. Both pages were added to the web sites sitemap. The graphic shows a SIP package which is common for resistor networks or resistor arrays.

Resistor Definitions

Added a new set of pages for definitions of Resistors. Not sure how many pages will end up being part of the Resistor Glossary, but these are the pages to date. Maybe I'll edit this page later to add in any new sections as I get them organized.

The new Resistor section also serves to bring all the other pages that deal with the different aspects of resistors to one listing. Note all the entries with links to related topics.

Resistor Terms 'A',
Resistor Terms 'B-C',
Resistor Terms 'D-E',
Resistor Terms 'F-M',
Resistor Terms 'N',
Resistor Terms 'P',
Resistor Terms 'R',
Resistor Terms 'S',
Resistor Terms 'T',
Resistor Terms 'V',

The pages are some what small, but I wanted to leave space for additional information. There are still some resistor terms missing, it's a group of new pages. I should be able to add some more definitions Saturday.

This section can be reach via the Electronic Dictionary page, under the Glossaries listing. This new section should complement the Dictionary of Capacitor Terms.

Resistor Tolerance

A new page has been added to address Resistor Tolerance. The page covers the basic definition of Resistor Tolerance, including self heating and Temperature Coefficient of Resistance. The main link to the page resides on the 'Tolerance' Electronic Dictionary page.

Additional pages that cover resistor topics include;
Resistor Values and Package Sizes.
Resistor MIL Specifications.
Resistor Derating Guide-lines.
Resistor Networks Derating.
Resistor Network Styles.
Resistor Network Package Styles.
Resistor Manufacturers.
Resistor Networks Manufacturers.
Resistor Chip Attenuator Manufacturers.
Resistor Dictionary Terms.

There may be a few other pages, but the ones listed above are the main pages, and they will point to any pages not listed here. Of course there is also a Dictionary of Capacitor Terms too.

Resistor Chip Attenuator Manufacturers

Following yesterdays posting of Manufacturers of Current Sense Resistors, a new page was added providing a listing for Resistor Chip Attenuator Manufacturers. Both pages are linked of the main Resistor Manufacturers page, and all three pages should be cross-linked.

There are other sub pages linked from the resistor pages that do not contain a link to either of the new pages;
Manufacturers of Potentiometers,
Manufacturers of Thermistors,
Manufacturers of Varistors,
Manufacturers of Semiconductor Resistors.

Never had a chance to design a circuit using a Current Sense Resistor, but it's hard to design a board with out an attenuator. However, always having a small amount of free space I don't purchase a new device to make an attenuator. I reuse the same resistors already used on the part list if possible. Why add a new line item, if you can avoid it. Of course for that to work, you need to be using many different resistor values.

Always add to the quantity of a line item rather than adding a new line item. New line items always cost more.

Oh the top listing for electronic component Manufacturers, or Passive Circuit Design data.