5 V fixed shunt reference in a SC-70-5
It operates as a two-terminal shunt (Zener-like) device, requiring only a series resistor from the supply to set the bias current. The SC-70-5 package (also known as SOT-353) keeps the footprint small — about 2.0 mm × 2.1 mm — making it a fit for dense analog or mixed-signal boards where board area is tight.
Output voltage, tolerance, and noise floor
Fixed 5 V output with ±1% tolerance means the reference voltage stays between 4.95 V and 5.05 V at 25°C — tight enough for 8-bit ADC references and most comparator thresholds.
Cathode current and output drive
As a shunt reference, the LM4040DIM7-5.0 sinks current from the load through the cathode pin. Minimum cathode current is 85 µA — the series resistor must be chosen to keep at least this much flowing into the device to maintain regulation. Maximum output current is 15 mA, which limits the load this reference can drive directly; for higher loads, buffer with an op-amp. The shunt topology means it can be used as a positive or negative reference by flipping the orientation.
This means the manufacturer has flagged it for eventual discontinuation, but it remains available for existing production BOMs. No official successor or second-source part is listed in the record. For new designs, consider the LM4040AIM7-5.0 if a tighter tolerance (±0.1%) is needed, or evaluate the broader LM4040 family for active alternatives.