So... Looking at some other Microchip (based on the logo) voltage regulators, I'm guessing 3-pin SOT-89 (3 leads on one side, one tab on the other, maybe 5mm in the long direction?
According to various data sheets, the "HJ" is the relevant part (but I didn't actually find it...)
xxx (sometimes two chars) identifies the part and variation (ie regulator foo, 3,3V variation), YY is the year (2016), WW is the week of that year (11), NNN (V1P) is a "traceability code."
This tends to be in the "packaging information" section of the datasheet. It's the microchip parts that are numbered like these; the acquisitions (TEMIC, Micrel) have different formats...)
Johnny010:
Seems a bit odd that the markings don't give a hint.
Not at all.
These parts are not designed for hand assembly.
You buy them on reels (which are marked) and load the reel into the pick and place machine, no need to for the individual part to be marked at all. As is the case with most SMT capacitors.
Now I know what "that part" of the datasheet can be useful for...
If you're lucky. I was a bit miffed that the Micrel data sheets didn't have that section!
I'm glad my info was useful...
For some parts, there are guides. The SMD Code Book, but you have to be able to figure out which part of the printing is the relevant identifier, rather than the datecode or "code", so having an identifiable manufacturer logo is REALLY valuable.
CrossRoads:
I've got bags of little SMD LEDs, I use a sharpie and mark their anode/cathode orientations on the bag so I don't have to keep looking up the datasheet.
SMD LED's have a microscopic green mark on the negative side.
Krupski:
SMD LED's have a microscopic green mark on the negative side.
Some do but not all. As previous posters have mentioned, there's no standard for this.
I've started including ease of reading markings as part of my selection criteria for SMD LEDs, Kingsbright units usually have a fairly easy to see green arrow on the underside for example which I can see with the naked eye down to 0603 size.
As far as I'm aware the one standard is that the anode (negative) side of the LED is closest to the side of the tape with the holes in it but always check your datasheet.
GilchristT:
Some do but not all. As previous posters have mentioned, there's no standard for this.
I've started including ease of reading markings as part of my selection criteria for SMD LEDs, Kingsbright units usually have a fairly easy to see green arrow on the underside for example which I can see with the naked eye down to 0603 size.
As far as I'm aware the one standard is that the anode (negative) side of the LED is closest to the side of the tape with the holes in it but always check your datasheet.
You may be right... all I'm saying is that all the different SMD LED's I've seen have the green marking.
As far as "anode" and "cathode", there seems to be perpetual confusion as to what an "anode" or "cathode" is, as well as "electron flow" versus "current flow".
After tearing my hair out for years over this, I've resorted to simply saying "the negative side" or "the positive side".
Krupski:
After tearing my hair out for years over this, I've resorted to simply saying "the negative side" or "the positive side".
That way, I'm not confused!
You will be as soon as you try the same translation for a battery and an LED. It is quite simple. The cathode is where electrons come from. For me, anytime I forget which way around it is, a very clear reminder on that is the cathode ray, that is, an electron beam coming from the cathode.
On a battery, electrons come from the positive side, so + is the cathode, while for an LED, the negative side emits electrons and is the cathode.
oo bad "conventional current", and all the semiconductor arrows and such, go in the opposite direction from electrons
Its not to bad at all... It's convention. If you accept it, everything will be OK.
Truth is, we don't have to care which direction electricity moves at a component level... We can measure and control current flow... that is what DOES matter.
Now, when we try to CHANGE conventional view, that is when things get messy. (I'm looking at you Mosfet!)
