Nice Small HV-ish Diode

MMBD5004S-7 is nice too, a dual 400 volt diode in SOT23.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Still kinda big, longer than an 0805 part.

--
 Thanks, 
    - Win

Sheeesh! What's the creep distance for 800V? ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | It's what you learn, after you know it all, that counts.

The recommended Panasonic pcb pad footprint works out to 13v/mil.

This one runs about 62 v/mil:

Recommendations for surface clearances seem to vary from about 7.5 to at least 40 v/mil. I use 8, but some parts don't let me do that.

You can buy a 3KV 1206 ceramic cap. That's about 60 v/mil.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

One can always locate a slot under the part. The family includes a 300V part, same size. I used to get Bourns diode in 0805 package, very useful, but they discontinued it. Dunno why small diodes have to be so big.

--
 Thanks, 
    - Win

8 sounds about right, the rule is usually 10kv/in in air. Larger if in some insulating median.

Cheers

I've seen 0603s with kV ratings before. Potted, of course...

Can't seem to find it anymore, hmm...

Oh, no wonder! SEI's HVCB series was rated this way:

From the very same server, since Stackpole's acquisition of them, the rating seems to have been dropped:

Maybe they figured it was wiser to do so? :)

(Note that "HVCB" is still a valid part number.)

Tim

--
Seven Transistor Labs, LLC 
Electrical Engineering Consultation and Contract Design 
Website: https://www.seventransistorlabs.com/

Yep. I'm fond of slots. My first medical-rated switcher I used those giant 4-legged opto-couplers straddling a 1/4" slot. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
     It's what you learn, after you know it all, that counts.

Is that 'mil' as in milli-inches, or millimeters?

Traditionally, printing uses inch units... semiconductors were designated in inches for surface features, and microns for depth, for years until the dimensions got so small that engineers stopped retasking printing press accesories.

I think mil is inches. Millimeters is mm. Nanometers is nm. Centimeters is cm. Micron is um.

But it's only 800 volts.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Well, to be perfectly correct, 1 mil == 0.0254 mm. It's all millimeters sooner or later. :)

I don't know of anyone in EE that uses "mils" as "millimeters". General slang, maybe, but it's encountered pretty early in one's career, so it should be clear.

Tim

--
Seven Transistor Labs, LLC 
Electrical Engineering Consultation and Contract Design 
Website: https://www.seventransistorlabs.com/

Then you have feet, yards, miles, lb, and so on. Canada has switched over to metric, but we still show meat in lb when it is in the showcase. When you go to checkout, the price is in kg. This can be quite confusing for those who were not brought up in metric.

A mil is a thou of course.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

No, it's a tenth of a cent (or a tenth of a percent).

Also known as a per mille. ?

Tim

--
Seven Transistor Labs, LLC 
Electrical Engineering Consultation and Contract Design 
Website: https://www.seventransistorlabs.com/

Also known as "millage".