The LM4040A82IDBZT: The part is in current manufacture and can be specified into new designs without a sunset date. ROHS3 compliant, covering all 10 restricted substances including the four phthalates. No exemption-based materials in the bill.
8.192 V shunt reference — ±0.1% tolerance anchors the ADC
The LM4040A82IDBZT is a precision shunt voltage reference from TI's LM4040 family, delivering a fixed 8.192 V output with ±0.1% initial tolerance. This is the tightest bin in the LM4040A series — the grade that buys you a 12-bit system without a trim pot. The resistor value determines the load-regulation slope — a common oversight in first-pass BOMs.
Noise and drift — where the 8.192 V part sits in the signal chain
That translates to about 102 mV of total drift from cold to hot — roughly 0.5 LSB on a 12-bit converter sampling the 8.192 V rail. Systems that calibrate at 25°C and operate across the full temperature band should budget this drift into the error stack.
SOT-23-3 package — board-fit with common shunt references
The LM4040A82IDBZT comes in a SOT-23-3 package, the same footprint used by the LM4040CIM3-3.0/NOPB and the TL431IDBVR. Supplied in Tape & Reel — the standard 7-inch reel for SOT-23-3, compatible with most pick-and-place feeders. Cut Tape option available for prototype quantities.