LM4128AMFX-3.3/NOPB

Voltage Reference Overview

The LM4128AMFX-3.3/NOPB is a precision micropower series voltage reference IC manufactured by Texas Instruments in an SOT-23-5 package. It provides a fixed output voltage of 3.3 V with an initial accuracy of ±0.1% and a low temperature coefficient of 75 ppm/°C. The device operates within an input voltage range of 3.7 V to 5.5 V, supports a maximum shunt current of 20 mA, and draws a typical supply current of 60 μA. It functions reliably across an extended temperature range from -40°C to +125°C.

Voltage Reference Feature Summary

• Features an enable pin that allows for a low-power shutdown mode with current consumption reduced to 3 μA
• Delivers high precision performance with tight initial output voltage tolerance of ±0.1%
• Maintains stable reference output over wide temperature variations due to low temperature coefficient

Voltage Reference Applications

• Portable battery-powered instrumentation requiring low quiescent current
• Data acquisition systems needing stable reference voltages for ADCs
• Medical equipment where precision and low power consumption are critical

Voltage Reference Procurement Notes

Verify the complete part number including the suffix /NOPB to ensure lead-free compliance and specific packaging options such as reel or cut tape. Confirm the AM grade designation indicates the required ±0.1% accuracy level for your design. Check the datasheet for thermal management requirements given the small SOT-23-5 footprint and potential power dissipation under load conditions.

Voltage Reference Selection Notes

Select this component when a fixed 3.3 V reference with high precision is needed alongside ultra-low power consumption. The integrated enable feature makes it suitable for systems requiring periodic sleep modes. Ensure the input voltage remains within the specified 3.7 V to 5.5 V range to maintain regulation and stability during operation.

Voltage Reference Part Context

This device belongs to the LM4128 family of precision micropower series voltage references. The AM grade specifies tighter initial accuracy compared to lower grades. The FX suffix denotes tape and reel packaging, while NOPB indicates a lead-free and rohs-compliant variant compatible with modern assembly processes.

Voltage Reference Replacement Considerations

LM4128AIMF-3.3/NOPB offers similar specifications with potentially different packaging or grade variations. LM4128BIMF-3.3/NOPB provides wider initial accuracy tolerance. Verify pinout compatibility and thermal characteristics before substituting any alternative part numbers.