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Decoding TI's pin packages


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As I'm browsing through the parts catalog, I keep seeing identical parts with different suffixes and no explanation about what they mean.  For example:

 

 

SN74LVC2G34DBVR 
SN74LVC2G34DBVRE4 
SN74LVC2G34DBVRG4
 
or
ISO7231CDW
ISO7231CDWG4
ISO7231CDWR
ISO7231CDWRG4
 
All of them have the exact same specs, including the pin package.  The difference is whatever R vs RE4 vs RG4  or G4 vs R vs RG4 means.  I've searched the Google...I've searched the data sheets...I've searched TI's site....nothing
 
The only possible difference I see is the occasional difference in how it's packaged...aka Reel Vs cut tape.
 
Does anyone know how to decode this?
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http://focus.ti.com/quality/docs/gencontent.tsp?templateId=5909&navigationId=11753&contentId=5055

 

E4 and g4 refer to lead free packaging and molding options (see link).

 

R is normally for Large Tape & Reel (3000) vs the non-r 250 reel.

 

And they used to have some for temperature rating, but they pretty much phased those out a few years ago.

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True, this is kind of a confusing system. cde captured your examples. MSP430 specific there are a couple others.

 

MSP430F2274IDA

MSP430F2274IDAT

MSP430F2274IDAR

 

MSP430F2274TDA

MSP430F2274TDAT

MSP430F2274TDAR

 

DA = Package (http://www.ti.com/sc/docs/psheets/mechanic.htm)

I/T = -40 to 85 DEG C / -40 to 105 DEG C

S = Special Temp Range, like MSP430L092SPW is 0 to 50 DEG C

 

_/T/R = Tube or Tray delivery / Mini Reel 250 pcs. / Large Reel, depends on package size, usually 2500 pcs.

 

MSP430F2274MDATEP

 

M = Military -55 to 125 DEG C

EP = Enhanced Product

Q1 = Q100 Automotive Qualified

 

The MSP430s are all lead free, therefore no differentiation.

 

 

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