Product Overview
Philips TL431AC - Adjustable Shunt Voltage Reference, SO-8
Condition
Unused, new old stock. Kept in original packaging and in excellent preserved condition. The photo shows a representative unit from our stock. Same or next business day shipping from our Idaho warehouse. Honest pricing, no nonsense. Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
The TL431 is a three-terminal programmable shunt reference that Philips second-sourced from the original TI part. The piece photographed here is a black eight-lead small-outline surface mount body with four gull-wing leads down each side, printed TL431AC on the top line, J0471 beneath it and 718n beneath that, with THAILAND running up the left edge and a small round logo set between the two marking columns; it is shown once on a light crinkled backdrop and once resting on a fingertip. 23 of this part number are on the shelf, sold one at a time.
Key Features
- Type: three-terminal adjustable shunt voltage reference, in an eight-lead package
- Reference voltage: 2.495 V (V_ref, per published TL431 data)
- Programmable output: up to 36 V, per published TL431 data and this listing's own existing copy
- Cathode current: 1 mA to 100 mA (I_KA), per published TL431 data
- Dynamic impedance: about 0.2 ohms typical (Z_KA), per published TL431 data
- Temperature coefficient: 30 ppm per degC typical, carried over from this listing's own existing copy
- Grade letters: A is the tightened tolerance grade, C is the 0 to 70 degC commercial range, per published TL431 data; this body is printed TL431AC, so both letters are confirmed on the part rather than assumed
- Package: eight-lead small-outline surface mount, four gull-wing leads per side, as photographed
- Marking on the photographed body: TL431AC over J0471 over 718n, with THAILAND up the left edge
- Verify against the published TL431 data before designing in.
Applications
- Secondary-side feedback in switching power supplies
- Adjustable shunt regulation and rail limiting
- Precision reference legs in measurement circuits
- Surface mount board repair calling out an SO-8 TL431
Frequently Asked Questions
How many should I order?
Order the count the build needs. 23 of this part number are on the shelf, sold one at a time, so a supply's feedback position and its spares come out of one order. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
A three-terminal reference with eight leads?
Yes. The TL431 function is three terminals - reference, anode and cathode - but this unit is in an eight-lead small-outline surface mount body, four gull-wing leads down each side, which is what the photographs show. If you were expecting the through-hole TO-92 the part is more often seen in, this is not that. The published TL431 data we work from does not tell us how the remaining pins are assigned in this package, so this page states no pinout; ask before you order if that matters to your footprint. The body itself is printed TL431AC over J0471 over 718n, with THAILAND up the left edge, and that A and C are the tolerance grade and the 0 to 70 degC commercial range read off the part.
Two point four nine five volts, held steady by a chip that sits comfortably on a fingertip.
