LM4040DEM3-5.0 Equivalent & Substitute Parts

Part Overview

The LM4040DEM3-5.0 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 5V output with ±1% tolerance in a surface-mount SOT-23-3 package. This device is classified as Last Time Buy, indicating discontinued production. The part operates across -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary due to the Last Time Buy status of the main part number. Alternative sources and upgraded variants ensure design continuity and long-term supply chain reliability for applications requiring fixed 5V shunt voltage reference functionality.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Current - Output	15 mA
Tolerance	±1%
Temperature Coefficient	150ppm/°C
Noise - 10Hz to 10kHz	80µVrms
Current - Cathode	88 µA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the LM4040DEM3-5.0 is based on the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt
Output Voltage: 5V (fixed)
Current Output: 15 mA
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount

Secondary Compatibility Factors:

Tolerance: ±1% or better
Temperature Coefficient: 150ppm/°C or lower
Operating Temperature Range: -40°C to 125°C minimum
Cathode Current: 88 µA nominal (±7 µA acceptable variance)
Noise Performance: 80µVrms or lower (10Hz to 10kHz)

Substitute parts are grouped into three categories: Parametric Equivalents (identical electrical specifications with different packaging or product status), Upgrade Options (improved tolerance or temperature coefficient), and Manufacturer-Recommended Alternatives (enhanced performance specifications).

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Noise (10Hz-10kHz)	Temp Range	Packaging	Status
LM4040DEM3-5.0	Texas Instruments	5V	±1%	150ppm/°C	88 µA	80µVrms	-40°C ~ 125°C	TR	Last Time Buy
LM4040D50QDBZR	Texas Instruments	5V	±1%	150ppm/°C	95 µA	80µVrms	-40°C ~ 125°C	TR	Active
LM4040D50QDBZT	Texas Instruments	5V	±1%	150ppm/°C	95 µA	80µVrms	-40°C ~ 125°C	CT & Digi-Reel	Active
LM4040DEM3-5.0/NOPB	Texas Instruments	5V	±1%	150ppm/°C	88 µA	80µVrms	-40°C ~ 125°C	CT & Digi-Reel	Active
LM4040DEM3X-5.0/NOPB	Texas Instruments	5V	±1%	150ppm/°C	88 µA	80µVrms	-40°C ~ 125°C	TR	Active
ZR40401F50TA	Diodes Incorporated	5V	±1%	100ppm/°C	60 µA	105µVrms	-40°C ~ 85°C	TR	Last Time Buy
ADR5045ARTZ-R2	Analog Devices Inc.	5V	±0.2%	100ppm/°C	60 µA	280µVrms	-40°C ~ 125°C	-	Discontinued at DiGi Electronics
ADR5045ARTZ-REEL7	Analog Devices Inc.	5V	±0.2%	100ppm/°C	60 µA	280µVrms	-40°C ~ 125°C	TR	Active
ADR5045BRTZ-REEL7	Analog Devices Inc.	5V	±0.1%	75ppm/°C	60 µA	280µVrms	-40°C ~ 125°C	CT & Digi-Reel	Active
LM4040AEM3-5.0+T	Analog Devices Inc./Maxim Integrated	5V	±0.1%	100ppm/°C	80 µA	80µVrms	-40°C ~ 125°C	CT & Digi-Reel	Active
LM4040AIM3-5.0+T	Analog Devices Inc./Maxim Integrated	5V	±0.1%	100ppm/°C	80 µA	80µVrms	-40°C ~ 85°C	TR	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement): LM4040D50QDBZR, LM4040D50QDBZT, LM4040DEM3-5.0/NOPB, and LM4040DEM3X-5.0/NOPB maintain identical electrical specifications to the main part. These Texas Instruments variants are all ROHS3 compliant with unlimited MSL rating. LM4040DEM3-5.0/NOPB and LM4040DEM3X-5.0/NOPB are Active status parts with 8159 and 4496 units in stock respectively, providing immediate supply continuity.

Upgrade Options: LM4040AEM3-5.0+T and LM4040AIM3-5.0+T offer improved ±0.1% tolerance versus the original ±1%, with identical noise performance (80µVrms). Both are Active status and ROHS3 compliant. LM4040AEM3-5.0+T supports the full -40°C to 125°C range with 20400 units available. LM4040AIM3-5.0+T operates to -40°C to 85°C with 6698 units in stock.

Manufacturer-Recommended Alternatives: ADR5045ARTZ-REEL7 and ADR5045BRTZ-REEL7 from Analog Devices Inc. provide superior tolerance specifications (±0.2% and ±0.1% respectively) with lower temperature coefficients (100ppm/°C and 75ppm/°C). Both are Active status, ROHS3 compliant, and support -40°C to 125°C operation. ADR5045ARTZ-REEL7 has 36120 units in stock; ADR5045BRTZ-REEL7 has 15435 units.

All recommended substitutes maintain SOT-23-3 package compatibility, surface-mount capability, and compliance certifications (ROHS3, REACH Unaffected, EAR99).

Frequently Asked Questions (FAQ)

Q: Can LM4040D50QDBZR replace LM4040DEM3-5.0 directly? A: Yes. LM4040D50QDBZR is a parametric equivalent with identical 5V output, ±1% tolerance, 150ppm/°C temperature coefficient, and 80µVrms noise specification. The primary difference is packaging format (Tape & Reel) and Active product status. Cathode current is 95 µA versus 88 µA, a variance within acceptable operating margins.

Q: What is the difference between LM4040DEM3-5.0/NOPB and LM4040DEM3X-5.0/NOPB? A: Both are parametric equivalents with identical electrical specifications. LM4040DEM3-5.0/NOPB is available in Cut Tape & Digi-Reel packaging with 8159 units in stock. LM4040DEM3X-5.0/NOPB is Tape & Reel packaged with 4496 units available. Selection depends on assembly process requirements.

Q: Why do ADR5045 parts have higher noise specifications? A: ADR5045 series devices specify 280µVrms noise (10Hz to 10kHz) compared to 80µVrms for LM4040 variants. This higher noise specification does not preclude substitution; it reflects different measurement methodologies or device architecture. The 5V output, 15 mA current, and SOT-23-3 package remain functionally equivalent.

Q: Is ZR40401F50TA suitable as a replacement? A: ZR40401F50TA from Diodes Incorporated meets core substitution criteria: 5V output, ±1% tolerance, SOT-23-3 package, and surface-mount capability. However, it operates only to -40°C to 85°C (versus -40°C to 125°C for the main part) and is Last Time Buy status. Use only if temperature range limitation is acceptable for the application.

Q: Can I use LM4040AEM3-5.0+T or LM4040AIM3-5.0+T as upgrades? A: Yes. Both offer improved ±0.1% tolerance with identical 80µVrms noise and SOT-23-3 package compatibility. LM4040AEM3-5.0+T supports full -40°C to 125°C range. LM4040AIM3-5.0+T operates to -40°C to 85°C. Both are Active status with strong inventory availability.

Q: What packaging options are available? A: Substitutes are available in three packaging formats: Tape & Reel (TR), Cut Tape & Digi-Reel (CT), and unspecified packaging. All maintain SOT-23-3 physical form factor. Selection depends on assembly equipment compatibility and volume requirements.

Q: Are all substitutes ROHS3 compliant? A: All recommended substitutes except ADR5045ARTZ-R2 are explicitly ROHS3 compliant. ADR5045ARTZ-R2 is Discontinued at DiGi Electronics and should not be selected for new designs. All active alternatives meet ROHS3 and REACH compliance requirements.

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