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LM431 (TL431) 0.1-10 Hz Vp-p noise.
GigaJoe:
assuming both bandgap type ,
lm4140 - consumed 0.2 mA ; it series , I assume fraction to bandgap feeding
tl431 - can be 0.4 mA to 0.6mA - i assume higher current for bandgap.
AS431 (diodes) - 1mA
lm4140 noise as 2.2uV p-p defined for lowest 1.024 Vout and it less then native bandgap voltage output
tl431 - 2.5V out and 2X bandgap as well 2X internal noise of bandgap
may i guess - level of current consumption may indirectly define noise output ?
btw , comparing lm4140 noise with output 1.024 ,and something else with output 5V , would be incorrect , as per 4140 5V out actual Vp-p = 2.2 X (5 / 1.024)
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