LM4040CEM3-2.5 Equivalent & Substitute Parts

Part Overview

The LM4040CEM3-2.5 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This component is classified as Last Time Buy, indicating discontinued production status. The LM4040CEM3-2.5 serves as a precision voltage reference in power management applications requiring stable reference voltages across industrial temperature ranges (-40°C to 125°C).

Equivalent and substitute parts are necessary due to the Last Time Buy status of the original LM4040CEM3-2.5. Alternative part numbers from Texas Instruments and Analog Devices Inc. provide continued availability while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	LM4040CEM3-2.5
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	15 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	35µVrms
Current - Cathode	68 µA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM4040CEM3-2.5 are grouped into two categories based on electrical parameter compatibility:

Category 1: Direct Parametric Equivalents (Texas Instruments LM4040 Series) These parts maintain identical electrical specifications: 2.5V fixed output, ±0.5% tolerance, 15 mA output current, 100ppm/°C temperature coefficient, 35µVrms noise (10Hz to 10kHz), and SOT-23-3 packaging. Differences exist only in product status (Active vs. Last Time Buy), packaging format (Tape & Reel vs. Cut Tape), and cathode current specifications (68 µA vs. 80 µA). Parts in this category include LM4040CEM3X-2.5/NOPB, LM4040C25QDBZR, LM4040C25QDBZT, LM4040CEM3-2.5/NOPB, and LM4040QCEM3-2.5/NOPB.

Category 2: Enhanced Performance Equivalents (Analog Devices ADR5041 Series) These parts provide superior electrical performance with tighter tolerance specifications (±0.1% to ±0.2% vs. ±0.5%), lower noise characteristics (3.2µVrms to 150µVrms vs. 35µVrms), and lower cathode current (60 µA vs. 68 µA). All maintain 2.5V fixed output, 15 mA output current, SOT-23-3 packaging, and -40°C to 125°C operating temperature range. Parts include ADR5041ARTZ-REEL7, ADR5041BRTZ-R2, ADR5041BRTZ-REEL7, and ADR5041WARTZ-R7.

Category 3: Maxim Integrated Alternative (LM4040AEM3-2.5+T) This part offers ±0.1% tolerance with automotive-grade qualification (AEC-Q100), maintaining all other core electrical parameters identical to the original part.

Substitution is valid when the application requirements permit tolerance, noise, and cathode current variations within the specified ranges.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Package	Product Status	Packaging Format
LM4040CEM3-2.5	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	68 µA	SOT-23-3	Last Time Buy	Tape & Reel (TR)
LM4040CEM3X-2.5/NOPB	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	68 µA	SOT-23-3	Active	Tape & Reel (TR)
LM4040C25QDBZR	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	80 µA	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
LM4040C25QDBZT	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	80 µA	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
LM4040CEM3-2.5/NOPB	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	68 µA	SOT-23-3	Active	Tape & Reel (TR)
LM4040QCEM3-2.5/NOPB	Texas Instruments	2.5V	±0.5%	100ppm/°C	35µVrms	68 µA	SOT-23-3	Active	Tape & Reel (TR)
ADR5041ARTZ-REEL7	Analog Devices Inc.	2.5V	±0.2%	100ppm/°C	150µVrms	60 µA	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
ADR5041BRTZ-R2	Analog Devices Inc.	2.5V	±0.1%	75ppm/°C	150µVrms	60 µA	SOT-23-3	Discontinued at DiGi Electronics	-
ADR5041BRTZ-REEL7	Analog Devices Inc.	2.5V	±0.1%	75ppm/°C	150µVrms	60 µA	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
ADR5041WARTZ-R7	Analog Devices Inc.	2.5V	±0.2%	100ppm/°C	150µVrms	60 µA	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
LM4040AEM3-2.5+T	Analog Devices Inc./Maxim Integrated	2.5V	±0.1%	100ppm/°C	35µVrms	65 µA	SOT-23-3	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance) Select LM4040CEM3X-2.5/NOPB, LM4040CEM3-2.5/NOPB, or LM4040QCEM3-2.5/NOPB when the application requires exact electrical parameter matching to the original LM4040CEM3-2.5. All three parts maintain ±0.5% tolerance, 100ppm/°C temperature coefficient, and 35µVrms noise specifications. LM4040QCEM3-2.5/NOPB includes automotive-grade qualification (AEC-Q100), suitable for automotive applications. These parts are in Active product status, ensuring continued availability.

For High-Volume or Cut Tape Packaging Requirements Select LM4040C25QDBZR or LM4040C25QDBZT when Cut Tape & Digi-Reel® packaging is required for automated assembly processes. Both parts maintain electrical equivalence with cathode current of 80 µA (12 µA higher than the original). These parts are in Active product status with substantial inventory availability (24,843 and 8,221 units respectively).

For Enhanced Tolerance and Lower Noise Applications Select ADR5041BRTZ-REEL7 when applications require ±0.1% tolerance and lower temperature coefficient (75ppm/°C). This Analog Devices part maintains 2.5V output, 15 mA current, and SOT-23-3 packaging with Active product status and 16,889 units in inventory. Cathode current is 60 µA, 8 µA lower than the original.

For Automotive-Grade Applications with Superior Performance Select LM4040AEM3-2.5+T when automotive qualification (AEC-Q100) is required with ±0.1% tolerance. This part maintains 35µVrms noise specification and Tape & Reel packaging identical to the original, with 2,700 units in inventory.

For Automotive Applications with Analog Devices Preference Select ADR5041WARTZ-R7 when automotive-grade shunt voltage reference with ±0.2% tolerance is required from Analog Devices. This part is in Active status with 2,606 units available.

Frequently Asked Questions (FAQ)

Q: Can LM4040C25QDBZR and LM4040C25QDBZT be used as direct replacements for LM4040CEM3-2.5? A: Yes, with one electrical parameter difference. Both parts maintain 2.5V output, ±0.5% tolerance, 100ppm/°C temperature coefficient, and 35µVrms noise. The cathode current is 80 µA compared to 68 µA in the original. This 12 µA difference is acceptable in most applications where cathode current is not a critical design parameter. Both parts use Cut Tape & Digi-Reel® packaging instead of Tape & Reel.

Q: What is the difference between LM4040CEM3X-2.5/NOPB and LM4040CEM3-2.5/NOPB? A: Both parts are electrically identical with 2.5V output, ±0.5% tolerance, 100ppm/°C temperature coefficient, 35µVrms noise, and 68 µA cathode current in SOT-23-3 packaging. The primary difference is product status: LM4040CEM3X-2.5/NOPB is the active production variant, while LM4040CEM3-2.5/NOPB is also active but represents a different manufacturing designation. Both are suitable replacements.

Q: Are Analog Devices ADR5041 parts compatible with the LM4040CEM3-2.5? A: Yes, with performance enhancements. ADR5041 parts maintain 2.5V output, 15 mA current, and SOT-23-3 packaging. ADR5041ARTZ-REEL7 and ADR5041WARTZ-R7 offer ±0.2% tolerance compared to ±0.5%, while ADR5041BRTZ-REEL7 and ADR5041BRTZ-R2 offer ±0.1% tolerance. Cathode current is 60 µA (8 µA lower). These parts are suitable when improved tolerance and lower cathode current are acceptable or beneficial.

Q: What is the significance of the /NOPB designation in part numbers? A: The /NOPB designation indicates "No Plumbum" (lead-free) RoHS3 compliance. Parts with this designation meet RoHS3 environmental standards. Both LM4040CEM3-2.5 and its equivalents with /NOPB designation are RoHS3 compliant.

Q: Can LM4040QCEM3-2.5/NOPB be used in non-automotive applications? A: Yes. LM4040QCEM3-2.5/NOPB includes automotive-grade qualification (AEC-Q100) but is suitable for any application requiring a 2.5V shunt voltage reference with ±0.5% tolerance. The automotive qualification indicates enhanced reliability testing and does not restrict use to automotive applications.

Q: What packaging format should I select for my application? A: Select Tape & Reel (TR) packaging for manual assembly or when reel quantities are preferred. Select Cut Tape (CT) & Digi-Reel® packaging for automated pick-and-place assembly processes. Both formats contain identical components; the difference is in delivery and handling format.

Q: Is LM4040AEM3-2.5+T suitable for applications requiring the lowest possible tolerance? A: LM4040AEM3-2.5+T offers ±0.1% tolerance, matching the performance of ADR5041BRTZ-REEL7 and ADR5041BRTZ-R2. It maintains 35µVrms noise (lower than ADR5041 parts at 150µVrms) and includes automotive-grade qualification. This part is suitable for precision applications requiring both tight tolerance and low noise.

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