The STMicroelectronics LM336BDT is a shunt-type voltage reference that produces a fixed 2.49 V output with a ±2% tolerance. It is designed for applications requiring a stable reference voltage, such as A/D converter references, power-supply monitoring, and comparator threshold setting.
Parametric limits for the BOM
The LM336BDT delivers up to 10 mA output current and requires a minimum 400 µA cathode current to regulate. The ±2% tolerance means the output voltage can vary between 2.44 V and 2.54 V at 25°C — adequate for general-purpose references but not for precision measurement where tighter tolerance (0.5% or better) is needed. The shunt topology means it behaves like a Zener diode: a series resistor sets the bias current, and the load current subtracts from the cathode current budget.
Obsolete — sourcing reality
The LM336BDT is listed as obsolete by STMicroelectronics. For new designs, a current-production shunt reference from the same family (e.g., LM336 series in a different package variant or a modern alternative from another manufacturer) should be evaluated.