What is the difference between these parts? The datasheet shows completely different pinnings, but both are specified over the same range and both have the A, B and ungraded specifications for tolerance.
Just curious.
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8 From the datasheet:
The TL432 has exactly the same functionality and electrical specifications as the TL431, but has different pinouts for the DBV, DBZ, and PK packages.
- 1\$\begingroup\$ Hmm interesting. Why would TI produce different pinned versions? Is it to ease routing on crowded PCBs? \$\endgroup\$Thomas O– Thomas O2010-10-18 21:44:31 +00:00Commented Oct 18, 2010 at 21:44
- 2\$\begingroup\$ I guess? Or maybe for compatibility with competing parts? \$\endgroup\$endolith– endolith2010-10-18 23:40:13 +00:00Commented Oct 18, 2010 at 23:40
- 2\$\begingroup\$ They probably redesigned the die, which caused the pin connections to move about. \$\endgroup\$Connor Wolf– Connor Wolf2010-10-19 06:56:07 +00:00Commented Oct 19, 2010 at 6:56
- \$\begingroup\$ I suppose they probably redesigned the die to reduce costs and/or increase yield, but couldn't make it pin-compatible. Maybe the TL432 is cheaper than the TL431. \$\endgroup\$Thomas O– Thomas O2010-10-19 11:49:56 +00:00Commented Oct 19, 2010 at 11:49
- 1\$\begingroup\$ I should have said "isolated switchers", to be exact. Lots and lots of isolated switchers use a TL431 on the secondary side. Its output is transferred to the primary side via an optocoupler. This app'note shows a step-by-step explanation how the TL431 replaces the reference/feedback circuit of a switcher IC: national.com/an/AN/AN-1095.pdf Not that I think it's a particularly elegant solution, but it shows the general idea. \$\endgroup\$zebonaut– zebonaut2011-07-25 20:25:50 +00:00Commented Jul 25, 2011 at 20:25