Shunt reference at 2.5 V — what the specs mean for the BOM
The Texas Instruments LM4040EIM7-2.5/NOPB is a fixed 2.5 V shunt voltage reference in an SC-70-5 package. It delivers up to 15 mA output current with a cathode current of 70 µA, making it a low-power choice for biasing ADCs, DACs, or comparator thresholds in battery-operated or space-constrained designs. The ±2% tolerance is a standard-precision grade — adequate for general-purpose regulation and reference duties, but not for high-accuracy instrumentation where tighter grades (0.1% or 0.05%) are specified.
The LM4040EIM7-2.5/NOPB is marked as obsolete by Texas Instruments. For a BOM requiring a 2.5 V shunt reference in SC-70-5, consider the LM4040 family's other tolerance and temperature grades — the LM4040CIM7-2.5 (0.5%) or LM4040AIM7-2.5 (0.1%) may be active alternatives, though their lifecycle status should be confirmed separately.
The SC-70-5 package (also known as SOT-353) is a 5-lead surface-mount footprint with 0.65 mm pitch.