On regular resistors, they give Watts + Ohm value. On surface mount resistors (SMD) they only provide the Ohm values. What am I missing here? How can I order the right SMD if they don’t list the Watts?
I know there must be a simple answer for my simple mind.[(-D]
As always, thanks.
The ones I see on Ebay have wattage, commonly 1/16 for 0402 1/10 for 0603 and 1/4 w for 1206.
I assume these are meant for SMD leds. How does one choose? They are also on ribbons like the caps I used in my Roy Rogers 6 gun, how do you solder wires to that little thing?
Here you go Brent
Size |
Length (mm) |
Width (mm) |
Height (mm) |
Watts |
|---|---|---|---|---|
0201 |
0.60 |
0.30 |
0.25 |
http://led.linear1.org/led.wiz
Thanks, Henry, there is an electronics store in Vancouver that sells SMD resistors, however, their website doesn’t list the watts of the SMD resistors, only the Ohms. I found that a little frustrating.
https://leeselectronic.com/en/
I guess the 1206 is what I want.
Thanks, Mel, your chart shows .125 W for the 1206. Looks like the 1210 or 1217 as I need a 1/4W.
My eyes are glazing over once again.[(-D]
Sometime ago I looked them up in the Digi-Key and Mouser catalogs. It was quite clear.
Rich
They even make them as small as 0201s. Although you can use them in place of regular resistors, SMD resistors are meant mainly for printed circuit boards (PCBs) to span between two soldering pads. As far as soldering, you tin the ends of an SMD resistor just like you would a resistor wire.
When I was working as a electronics tech a few years back doing prototype work, I was regularly hand-soldering 0603s & 0402s caps & resistors to prototype PCBs and/or wires. I had an advantage though: Regular access to a high-quality Olympus stereo microscope. My biggest challenge was hand-soldering a 0201 resistor to a circuit board. (I actually had to stand the resistor up longways to bridge the solder between the pad and the resistor.) At nearly 0.02 x 0.01" in size, I’m glad I didn’t have to do that very often.
Tom
Of course, you really don’t have to use an SMD resistor with a SMD LED. Sure, if space is an issue they’re great. All of my SMD LED installs in structures or rolling stock are supplied by 1/8 or 1/4 watt metal film resistors.
In a few passenger cars with many LEDs I had to use half-watt resistors. Anything less got too hot.
Good Luck, Ed
I thought the SMD resistors could be mounted and appear as little boxes on the wall of the RH.[C):-)]
Wow! You sure have more patience than I do… I scattered some details and piping around the walls, including heating pipes but to try to make the wiring as part of the actual details will certainly be a challenging, but rewarding, venture [8D]
My resistors and wiring just got tucked up amongst the rafters and beams.
You’re having too much FUN!
Cheers, Ed