LM4040CIM3-4.1 Equivalent & Substitute Parts

Part Overview

The LM4040CIM3-4.1 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±0.5% tolerance. This precision micropower device operates across -40°C to 85°C and is packaged in SOT-23-3 surface mount configuration. The part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Equivalent parts maintain identical electrical specifications, while substitute parts offer enhanced performance characteristics or improved availability.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	4.096V
Current - Output	15 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	80µVrms
Current - Cathode	73 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: output voltage (4.096V fixed), output current capability (15 mA), package type (SOT-23-3), and mounting configuration (surface mount). Parts are grouped into three categories:

Direct Equivalents maintain all electrical specifications including tolerance (±0.5%), temperature coefficient (100ppm/°C), and cathode current (73 µA). These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or minor suffix variations that do not affect electrical performance.

Parametric Equivalents deliver identical voltage output, current rating, and package configuration but may vary in tolerance, temperature coefficient, or cathode current specifications. These parts are electrically compatible for applications where the enhanced or alternative specifications do not conflict with circuit requirements.

Manufacturer Recommended Substitutes offer superior performance characteristics such as tighter tolerance (±0.1% to ±0.2%), lower temperature coefficient (75ppm/°C), or extended operating temperature range (-40°C to 125°C). These parts are suitable for applications requiring enhanced precision or wider thermal operating windows.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Product Status	Packaging
LM4040CIM3-4.1	Texas Instruments	4.096V	±0.5%	100ppm/°C	73 µA	-40°C ~ 85°C	Last Time Buy	Cut Tape (CT) & Digi-Reel®
LM4040CIM3-4.1/NOPB	Texas Instruments	4.096V	±0.5%	100ppm/°C	73 µA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel®
LM4040C41IDBZR	National Semiconductor	4.096V	±0.5%	100ppm/°C	88 µA	-40°C ~ 85°C	Active	Not Specified
LM4040C41IDBZT	Texas Instruments	4.096V	±0.5%	100ppm/°C	88 µA	-40°C ~ 85°C	Active	Tape & Reel (TR)
LM4040CIM3X-4.1/NOPB	Texas Instruments	4.096V	±0.5%	100ppm/°C	73 µA	-40°C ~ 85°C	Active	Tape & Reel (TR)
ADR5044ARTZ-REEL7	Analog Devices Inc.	4.096V	±0.2%	100ppm/°C	60 µA	-40°C ~ 125°C	Active	Cut Tape (CT) & Digi-Reel®
ADR5044BRTZ-R2	Analog Devices Inc.	4.096V	±0.1%	75ppm/°C	60 µA	-40°C ~ 125°C	Discontinued at DiGi Electronics	Not Specified
ADR5044BRTZ-REEL7	Analog Devices Inc.	4.096V	±0.1%	75ppm/°C	60 µA	-40°C ~ 125°C	Active	Cut Tape (CT) & Digi-Reel®
ADR5044WBRTZ-R7	Analog Devices Inc.	4.096V	±0.1%	75ppm/°C	60 µA	-40°C ~ 125°C	Active	Tape & Reel (TR)
LM4040AEM3-4.1+T	Analog Devices Inc./Maxim Integrated	4.096V	±0.1%	100ppm/°C	73 µA	-40°C ~ 125°C	Active	Not Specified
LM4040AIM3-4.1+T	Analog Devices Inc./Maxim Integrated	4.096V	±0.1%	100ppm/°C	73 µA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For Direct Replacement (Last Time Buy Mitigation): LM4040CIM3-4.1/NOPB is the primary equivalent, offering identical electrical specifications with Active product status and established supply chain availability. LM4040CIM3X-4.1/NOPB provides the same electrical performance in Tape & Reel packaging for automated assembly environments.

For Enhanced Precision Applications: ADR5044BRTZ-REEL7 and ADR5044WBRTZ-R7 deliver ±0.1% tolerance with 75ppm/°C temperature coefficient, suitable for applications requiring tighter voltage regulation. The automotive-grade ADR5044WBRTZ-R7 variant is available for automotive and high-reliability applications.

For Extended Temperature Range: ADR5044 series parts (all variants) support -40°C to 125°C operating temperature, compared to the LM4040CIM3-4.1 specification of -40°C to 85°C. This extended range accommodates industrial and automotive thermal environments.

For Reduced Cathode Current: ADR5044 series parts draw 60 µA cathode current versus 73 µA for the LM4040CIM3-4.1, reducing power consumption in battery-powered or low-power applications.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and SOT-23-3 package compatibility. Product status verification is essential; ADR5044BRTZ-R2 is discontinued at DiGi Electronics and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can LM4040CIM3-4.1/NOPB be used as a direct replacement for LM4040CIM3-4.1?

A: Yes. Both parts deliver identical electrical specifications: 4.096V fixed output, ±0.5% tolerance, 100ppm/°C temperature coefficient, and 73 µA cathode current. The /NOPB suffix indicates lead-free plating and does not affect electrical performance. LM4040CIM3-4.1/NOPB is Active status, making it suitable for new procurement.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly equipment. Both formats contain identical components; selection depends on assembly process requirements.

Q: Are ADR5044 parts compatible with LM4040CIM3-4.1 circuits?

A: ADR5044 parts are electrically compatible in SOT-23-3 package configuration and deliver the same 4.096V output voltage and 15 mA current rating. However, ADR5044 variants feature tighter tolerance (±0.1% to ±0.2%), lower temperature coefficient (75ppm/°C), and reduced cathode current (60 µA). These enhanced specifications do not create incompatibility; they improve circuit performance. Verify that the application does not depend on the higher cathode current of the LM4040CIM3-4.1.

Q: Why is ADR5044BRTZ-R2 listed as discontinued?

A: ADR5044BRTZ-R2 is discontinued at DiGi Electronics, indicating limited future availability. For new designs, select ADR5044BRTZ-REEL7 or ADR5044WBRTZ-R7, which offer identical electrical specifications and Active product status.

Q: Can I use LM4040AIM3-4.1+T in place of LM4040CIM3-4.1?

A: LM4040AIM3-4.1+T is compatible in SOT-23-3 package and delivers 4.096V output with 15 mA current rating. The LM4040A variant features ±0.1% tolerance (tighter than the ±0.5% of LM4040C) and maintains 100ppm/°C temperature coefficient. Operating temperature is -40°C to 85°C, matching the original part. The enhanced tolerance improves voltage regulation precision without creating circuit incompatibility.

Q: What is the significance of the temperature coefficient difference between LM4040 and ADR5044 parts?

A: Temperature coefficient (ppm/°C) quantifies voltage drift across the operating temperature range. LM4040 parts specify 100ppm/°C, while ADR5044 parts specify 75ppm/°C. Lower temperature coefficient indicates superior voltage stability across temperature extremes. For applications operating across the full -40°C to 125°C range, ADR5044 parts deliver more stable reference voltage.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and environmental standards.

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