8.192V shunt reference in a SOT-23-3 footprint
The LM4040CIM3-8.2 is a precision shunt voltage reference from Texas Instruments, delivering a fixed 8.192V output with ±0.5% initial tolerance. Housed in the SOT-23-3 package, it operates as a two-terminal shunt regulator requiring only a series resistor from the supply rail — no external compensation needed. The 95 µA minimum cathode current sets the operating floor; below that the reference drops out of regulation, so the bias resistor must be sized to maintain at least 95 µA through the device across the full input voltage range.
That means existing production continues, but the manufacturer will not qualify it into new designs, and a last-time-buy notice may come at any time. For current BOM lines already using the LM4040CIM3-8.2, secure your forecast quantities now — the window to buy fresh production is finite. New designs should evaluate the active-production siblings in the LM4040 family to avoid a mid-production EOL surprise.
Industrial temperature grade and shunt operation
The 100 ppm/°C temperature coefficient keeps the output drift within 0.82 mV over the full range — tight enough for 12-bit ADC references. As a shunt reference, it sinks current from the load rather than sourcing it; the 15 mA maximum output current limits its use to low-power reference nodes, not rail-supply roles.
Noise floor for precision analog
For a 8.192V reference that translates to roughly 16 ppm rms noise — acceptable for 12-bit systems but marginal for 16-bit designs where the LSB sits at 125 µV. If your ADC requires sub-100 µV noise, consider a lower-noise bandgap reference or a post-filter on the output.