LM4140ACM-1.0

Voltage Reference Overview

The LM4140ACM-1.0/NOPB is a micropower low-dropout series voltage reference manufactured by Texas Instruments, housed in an SOIC-8 package. It provides a nominal output voltage of 1.024 V with an initial accuracy of 0.1%. The device features a temperature coefficient of 3 ppm/°C and operates within a junction temperature range of 0°C to +70°C. Maximum input voltage is 5.6 V, with a maximum shunt current of 8 mA. Typical operating supply current is 230 µA, reducing to ≤1 µA in disable mode.

Voltage Reference Feature Summary

• High precision with 0.1% initial accuracy and ultra-low noise characteristics for signal integrity
• Low temperature drift of 3 ppm/°C ensures stable output across varying thermal conditions
• Micropower operation with typical 230 µA supply current and deep sleep mode under 1 µA

Voltage Reference Applications

• Precision instrumentation requiring stable voltage references
• Battery-powered portable devices due to low quiescent current
• Data acquisition systems needing high accuracy analog front ends

Voltage Reference Procurement Notes

Verify the complete part number includes the /NOPB suffix for lead-free compliance when ordering. Confirm the specific output voltage variant (1.024 V) matches the design requirement. Ensure the SOIC-8 package type is compatible with the PCB footprint. Check the operating temperature range limits against the application environment specifications before finalizing procurement.

Voltage Reference Selection Notes

Select this component for applications demanding high precision and low power consumption. The 0.1% accuracy and 3 ppm/°C drift make it suitable for sensitive measurement circuits. Consider the 5.6 V maximum input voltage limit when designing the power supply rail. The disable pin feature allows for significant power savings in battery-operated systems compared to standard references.

Voltage Reference Part Context

This device belongs to the LM4140 family of high-precision micropower voltage references from Texas Instruments. It serves as a successor to older National Semiconductor designs, offering improved performance metrics such as lower noise and tighter tolerance. The series is designed to replace discrete zener diode references in modern electronic systems requiring superior stability and efficiency.

Voltage Reference Replacement Considerations

LM4140ACM-1.0/NOPB is the direct equivalent. LM4140AIM3-1.0 offers the same electrical specifications in a SOT-23-3 package.