Hi.

Could someone verify that this is a 2N3904 transistor. I do not remember, nor did I label the envelope it's in.

... and the guys at Google are not helping ...

 

not according to the datasheet

 

... and the guys at Google are not helping ...

Maybe Google did not help you, but by using the Altavista search engine I came up with this http://www.s-manuals.com/smd/r1 So I think you are on the correct track. SMD markings are an odd field. But serching on the 3 first letters only and function like "R1A transistor", or "R1A NPN" often bring good results

 

I assume it's an 2n3904. Yes, I know:"Assumtions is the mother of all f'ups"

I'm living on the edge now, taking big risks...

Thanks for the replies!

 

I'm living on the edge now, taking big risks...

Thanks for the replies!

If you do not live on edge you are taking up to much space

 

If you do not live on edge you are taking up to much space

I'm not taking up nearly as much as you, Mister!!

 

Hi.

Could someone verify that this is a 2N3904 transistor. I do not remember, nor did I label the envelope i

There are various SMD lookups online, some are PDF, you can convert the html ones into PDF with the CutePDF application.

You have to watch out as some SMD markings are duplicated for 2 or more devices - usually identifying the package style narrows it down.

 

I believe 1A is the marking for a 2N3904, The R may be the manufacturer possibly Rohm I know they make a 2N3904.

 

I believe 1A is the marking for a 2N3904, The R may be the manufacturer possibly Rohm I know they make a 2N3904.

An "R" suffix can sometimes denote an alternative pin layout - it wasn't uncommon on stud rectifiers.

 

The attached datasheet says that

Mechanical Data

Case: SOT-23, Molded Plastic

Terminals: Solderable per MIL-STD-202, Method 208

Terminal Connections: See Diagram

Marking: K1N, R1A, 1AM

Weight: 0.008 grams (approx.)

So I am pretty sure it's an 3904 npn transistor.

Thanks for the replies!