LT1389BCS8-5#PBF

Voltage Reference Overview

The LT1389BCS8-5#PBF is a nanopower precision shunt voltage reference providing a nominal 5.000V output in an 8-lead plastic SO package. It features an initial voltage accuracy of ±0.075% and a maximum temperature coefficient of 50ppm/°C over the 0°C to 70°C operating range. The device maintains regulation with a minimum operating current of 1mA and exhibits low dynamic impedance, ensuring stability with capacitive loads without requiring external compensation capacitors.

Voltage Reference Feature Summary

• Achieves high precision through trimmed thin-film resistors and improved curvature correction techniques
• Maintains voltage regulation at ultralow operating currents suitable for battery-powered applications
• Demonstrates low temperature cycling hysteresis due to advanced design and packaging processes
• Operates stably with capacitive loads without the need for output compensation capacitors

Voltage Reference Applications

• Portable meters requiring low power consumption
• Precision regulators needing stable reference voltages
• A/D and D/A converter systems
• Calibrators demanding high accuracy

Voltage Reference Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the B grade designation matches the required 0.075% accuracy and 50ppm/°C drift specifications for your application. Ensure the SO-8 package dimensions align with your PCB footprint requirements. Check that the 0°C to 70°C commercial temperature range meets your environmental operating conditions.

Voltage Reference Selection Notes

Select this component when upgrading from older references like the LM385 or LT1634 where lower power consumption and guaranteed temperature drift are critical. The 5V output version is ideal for interfacing directly with standard logic levels or ADCs requiring a 5V reference. Consider the board leakage sensitivity; implement guard rings around DNC pins to minimize error induced by surface contamination or humidity.

Voltage Reference Part Context

This part belongs to the LT1389 family of nanopower precision shunt voltage references. The family includes variants with 1.25V, 2.5V, and 4.096V outputs. The BC grade offers tighter initial accuracy than the AC grade but with slightly higher temperature drift compared to the highest precision industrial grades. It serves as a direct pin-compatible replacement for several legacy shunt references in compact designs.

Voltage Reference Replacement Considerations

Publicly confirmed substitutes include the LT1389ACS8-5, LT1389BCS8-2.5, LT1389BCS8-4.096, and LT1389BCS8-1.25 for different voltage needs. It can replace LM185, LM385, LT1004, LT1034, and LT1634 where lowest power and guaranteed temperature drift are required. Verify that the replacement part's package and electrical characteristics match the original design constraints.