LM4050CEM3-2.5 Equivalent & Substitute Parts

Part Overview

The LM4050CEM3-2.5 is a shunt voltage reference IC from Texas Instruments, providing a fixed 2.5V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM4050CEM3-2.5 serves as a precision voltage reference in power management applications requiring stable reference voltages across industrial temperature ranges (-40°C to 125°C).

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	15 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C
Noise - 10Hz to 10kHz	41µVrms
Current - Cathode	65 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

Substitution for the LM4050CEM3-2.5 is determined by the following critical parameters:

Fixed output voltage of 2.5V
Shunt reference type with 15 mA output current capability
SOT-23-3 package compatibility
Operating temperature range of -40°C to 125°C
Surface mount configuration

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LM4050 Series): Parts with identical electrical specifications and packaging, differing only in product status (active vs. obsolete) or packaging format (tape & reel vs. bulk). These include LM4050CEM3-2.5/NOPB, LM4050CEM3X-2.5/NOPB, LM4050QCEM3-2.5/NOPB, LM4050QCEM3X2.5/NOPB, and TL4050C25QDBZR.

Manufacturer Recommended Alternatives (Analog Devices & Maxim Integrated): Parts from alternative manufacturers meeting the same functional requirements with enhanced specifications. These include ADR5041 series (±0.1% to ±0.2% tolerance) and LM4040 series (±0.1% tolerance), offering improved accuracy and lower noise characteristics while maintaining SOT-23-3 packaging and 2.5V fixed output.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Noise 10Hz-10kHz	Cathode Current	Temp Range	Product Status	Package
LM4050CEM3-2.5	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Obsolete	SOT-23-3
LM4050CEM3-2.5/NOPB	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
LM4050CEM3X-2.5/NOPB	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
LM4050QCEM3-2.5/NOPB	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
LM4050QCEM3X2.5/NOPB	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
TL4050C25QDBZR	Texas Instruments	2.5V	±0.5%	50ppm/°C	41µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
ADR5041ARTZ-REEL7	Analog Devices Inc.	2.5V	±0.2%	100ppm/°C	150µVrms	60 µA	-40°C ~ 125°C	Active	SOT-23-3
ADR5041BRTZ-R2	Analog Devices Inc.	2.5V	±0.1%	75ppm/°C	150µVrms	60 µA	-40°C ~ 125°C	Discontinued at DiGi Electronics	SOT-23-3
ADR5041BRTZ-REEL7	Analog Devices Inc.	2.5V	±0.1%	75ppm/°C	150µVrms	60 µA	-40°C ~ 125°C	Active	SOT-23-3
LM4040AEM3-2.5+T	Analog Devices Inc./Maxim Integrated	2.5V	±0.1%	100ppm/°C	35µVrms	65 µA	-40°C ~ 125°C	Active	SOT-23-3
LM4040AIM3-2.5+T	Analog Devices Inc./Maxim Integrated	2.5V	±0.1%	100ppm/°C	35µVrms	65 µA	-40°C ~ 85°C	Active	SOT-23-3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LM4050CEM3-2.5/NOPB, LM4050CEM3X-2.5/NOPB, LM4050QCEM3-2.5/NOPB, LM4050QCEM3X2.5/NOPB, or TL4050C25QDBZR. All are active products with identical electrical and mechanical specifications to the obsolete LM4050CEM3-2.5. The NOPB designation indicates lead-free, ROHS3 compliant packaging. The automotive-qualified variants (QCEM3 prefix) are suitable for applications requiring AEC-Q100 certification.

For Enhanced Performance: Select ADR5041BRTZ-REEL7 or LM4040AEM3-2.5+T for applications requiring improved accuracy and lower noise. ADR5041BRTZ-REEL7 provides ±0.1% tolerance with active product status. LM4040AEM3-2.5+T offers ±0.1% tolerance with automotive qualification (AEC-Q100) and lower noise performance (35µVrms vs. 41µVrms), maintaining the full -40°C to 125°C operating range.

For Industrial Temperature Range: LM4040AIM3-2.5+T operates over -40°C to 85°C, which is narrower than the original part's -40°C to 125°C range. This part is suitable only for applications not requiring the full 125°C upper temperature limit.

All recommended substitutes maintain SOT-23-3 packaging, 2.5V fixed output, 15 mA output current, and ROHS3 compliance with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can LM4050CEM3-2.5/NOPB be used as a direct replacement for LM4050CEM3-2.5?

A: Yes. LM4050CEM3-2.5/NOPB is electrically and mechanically identical to the obsolete LM4050CEM3-2.5. The primary difference is product status (active vs. obsolete) and packaging format designation (NOPB indicates lead-free, ROHS3 compliant). Both share identical tolerance (±0.5%), temperature coefficient (50ppm/°C), output current (15 mA), and operating temperature range (-40°C to 125°C).

Q: What is the difference between LM4050QCEM3-2.5/NOPB and LM4050CEM3-2.5/NOPB?

A: The QCEM3 prefix indicates automotive qualification (AEC-Q100 certified), while CEM3 is the industrial grade. Electrical specifications are identical. Select QCEM3 variants for automotive or mission-critical applications requiring AEC-Q100 certification.

Q: Can ADR5041BRTZ-REEL7 replace LM4050CEM3-2.5?

A: Yes, with enhanced specifications. ADR5041BRTZ-REEL7 maintains the same 2.5V output, SOT-23-3 package, and -40°C to 125°C operating range. It provides superior accuracy (±0.1% vs. ±0.5%) and lower noise (150µVrms vs. 41µVrms in the 10Hz-10kHz band). The higher temperature coefficient (100ppm/°C vs. 50ppm/°C) and cathode current (60 µA vs. 65 µA) are within acceptable substitution parameters.

Q: Is LM4040AIM3-2.5+T suitable for all applications using LM4050CEM3-2.5?

A: LM4040AIM3-2.5+T is suitable for applications operating within -40°C to 85°C. It is not recommended for applications requiring operation above 85°C, as the original part supports -40°C to 125°C. For full temperature range coverage, use LM4040AEM3-2.5+T instead.

Q: What does the /NOPB designation mean?

A: /NOPB indicates "No Plumbum" (lead-free) packaging, confirming ROHS3 compliance. This is the standard for modern surface mount components and is compatible with lead-free soldering processes.

Q: Are all substitute parts available in tape & reel packaging?

A: Most active substitutes are available in tape & reel (TR) or cut tape & Digi-Reel (CT) formats. Verify packaging availability with your supplier, as some parts may be offered in multiple packaging options. The original LM4050CEM3-2.5 was available in bulk; active equivalents are primarily distributed in tape & reel format.

Q: Can I use TL4050C25QDBZR instead of LM4050CEM3-2.5?

A: Yes. TL4050C25QDBZR is an active Texas Instruments product with identical electrical specifications (2.5V, ±0.5%, 50ppm/°C, 41µVrms noise, 15 mA output). It maintains SOT-23-3 packaging and -40°C to 125°C operating range, making it a direct functional equivalent.

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