LM4121IM5-ADJ/NOPB

Voltage Reference Overview

The LM4121IM5-ADJ/NOPB is a precision adjustable shunt voltage reference from Texas Instruments, housed in a SOT-23-5 surface-mount package. It provides an output voltage range of 1.21 V to 1.222 V with an initial accuracy of 0.5%. The device features a temperature coefficient of 50 ppm/°C and supports a maximum series input voltage of 14 V. It operates within a temperature range of -40°C to +85°C and has a maximum shunt current of 5 mA.

Voltage Reference Feature Summary

• Provides stable reference voltage with high initial accuracy
• Adjustable output configuration for flexible circuit design
• Low temperature coefficient ensures thermal stability

Voltage Reference Applications

• Precision analog-to-digital converter references
• Battery-powered instrumentation circuits
• Portable measurement devices requiring low power consumption

Voltage Reference Procurement Notes

Verify the specific suffix ADJ confirms the adjustable variant when sourcing. Ensure the NOPB designation indicates lead-free compliance and RoHS adherence. Confirm the SOT-23-5 package matches your PCB footprint requirements. Check manufacturer documentation for any recent pinout or electrical specification updates before finalizing procurement.

Voltage Reference Selection Notes

Select this component when a compact adjustable reference with moderate current capability is required. The 0.5% initial accuracy suits applications needing tighter tolerance than standard zener diodes. Consider the 5 mA max shunt current limit against your biasing needs. The SOT-23-5 package offers space efficiency for dense layouts compared to larger through-hole alternatives.

Voltage Reference Part Context

This part belongs to the LM4121 family of precision shunt references designed for low-power applications. It serves as a drop-in replacement for fixed voltage references in many designs due to its adjustability. The series is characterized by low noise and good long-term stability, making it suitable for sensitive signal conditioning stages in industrial and consumer electronics.

Voltage Reference Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.