LM4040DEM3X-5.0 Equivalent & Substitute Parts

Part Overview

The LM4040DEM3X-5.0 is a shunt voltage reference IC manufactured by Texas Instruments, providing a fixed 5V output with ±1% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Shunt voltage references are critical in precision analog circuits requiring stable reference voltages for data acquisition, power management, and signal conditioning applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4040DEM3X-5.0
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage	5V (Fixed)
Output Current	15 mA
Voltage Tolerance	±1%
Temperature Coefficient	150 ppm/°C
Noise (10Hz to 10kHz)	80 µVrms
Cathode Current	88 µA
Operating Temperature Range	-40°C to 125°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM4040DEM3X-5.0 are classified into three categories based on substitution compatibility:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 5V fixed output, 15 mA output current, ±1% tolerance, 150 ppm/°C temperature coefficient, 80 µVrms noise, and SOT-23-3 packaging. These parts differ primarily in product status (Active or Last Time Buy) and RoHS compliance. Parametric equivalents include LM4040D50QDBZR, LM4040D50QDBZT, LM4040DEM3-5.0, LM4040DEM3-5.0/NOPB, and LM4040DEM3X-5.0/NOPB.

Upgrade Parts provide enhanced performance characteristics while maintaining the same 5V output, 15 mA current capability, and SOT-23-3 package. The upgrade category includes ZR40401F50TA (Diodes Incorporated) with improved temperature coefficient (100 ppm/°C vs. 150 ppm/°C) and lower cathode current (60 µA vs. 88 µA), though with a reduced operating temperature range (-40°C to 85°C).

Manufacturer Recommended Parts from Analog Devices Inc. offer superior tolerance specifications (±0.2% and ±0.1%) and enhanced performance metrics. These include ADR5045ARTZ-R2, ADR5045ARTZ-REEL7, ADR5045BRTZ-REEL7, and LM4040AEM3-5.0+T, all maintaining 5V output, 15 mA current, and SOT-23-3 packaging with improved electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
LM4040DEM3X-5.0	Texas Instruments	5V	±1%	150	88	-40 to 125	Obsolete	Non-compliant	Tape & Reel
LM4040D50QDBZR	Texas Instruments	5V	±1%	150	95	-40 to 125	Active	ROHS3 Compliant	Tape & Reel
LM4040D50QDBZT	Texas Instruments	5V	±1%	150	95	-40 to 125	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LM4040DEM3-5.0	Texas Instruments	5V	±1%	150	88	-40 to 125	Last Time Buy	ROHS3 Compliant	Tape & Reel
LM4040DEM3-5.0/NOPB	Texas Instruments	5V	±1%	150	88	-40 to 125	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LM4040DEM3X-5.0/NOPB	Texas Instruments	5V	±1%	150	88	-40 to 125	Active	ROHS3 Compliant	Tape & Reel
ZR40401F50TA	Diodes Incorporated	5V	±1%	100	60	-40 to 85	Last Time Buy	ROHS3 Compliant	Tape & Reel
ADR5045ARTZ-R2	Analog Devices Inc.	5V	±0.2%	100	60	-40 to 125	Discontinued at DiGi Electronics	Not specified	Not specified
ADR5045ARTZ-REEL7	Analog Devices Inc.	5V	±0.2%	100	60	-40 to 125	Active	ROHS3 Compliant	Tape & Reel
ADR5045BRTZ-REEL7	Analog Devices Inc.	5V	±0.1%	75	60	-40 to 125	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LM4040AEM3-5.0+T	Analog Devices Inc./Maxim Integrated	5V	±0.1%	100	80	-40 to 125	Active	ROHS3 Compliant	Cut Tape & Digi-Reel

Engineering Selection Recommendations

For direct replacement of the obsolete LM4040DEM3X-5.0 in existing designs, LM4040DEM3X-5.0/NOPB is the primary choice, offering identical electrical specifications with Active product status and ROHS3 compliance. This part maintains the same cathode current (88 µA), temperature coefficient (150 ppm/°C), and noise characteristics while providing regulatory compliance advantages.

Alternative parametric equivalents LM4040D50QDBZR and LM4040D50QDBZT are Active status parts with ROHS3 compliance. These variants exhibit slightly elevated cathode current (95 µA vs. 88 µA) but maintain all other critical electrical parameters. Selection between these options depends on packaging preference: Tape & Reel (LM4040D50QDBZR) or Cut Tape & Digi-Reel (LM4040D50QDBZT).

For applications requiring enhanced performance with improved temperature stability and lower noise, ADR5045BRTZ-REEL7 (Analog Devices Inc.) provides ±0.1% tolerance, 75 ppm/°C temperature coefficient, and Active product status with full ROHS3 compliance. This part is suitable for precision analog circuits where superior reference accuracy justifies the component change.

The upgrade option ZR40401F50TA (Diodes Incorporated) offers improved temperature coefficient (100 ppm/°C) and reduced cathode current (60 µA) but operates only to 85°C maximum, making it unsuitable for applications requiring the full -40°C to 125°C range.

Frequently Asked Questions (FAQ)

Q: Can LM4040D50QDBZR directly replace LM4040DEM3X-5.0?

A: Yes. Both parts provide 5V fixed output, ±1% tolerance, 150 ppm/°C temperature coefficient, and SOT-23-3 packaging. The cathode current difference (95 µA vs. 88 µA) is within acceptable design margins for most applications. LM4040D50QDBZR offers the advantage of Active product status and ROHS3 compliance.

Q: What is the difference between LM4040DEM3X-5.0/NOPB and LM4040DEM3X-5.0?

A: Both parts are electrically identical with matching specifications. The /NOPB suffix indicates "No Plumbum" (lead-free) processing and ROHS3 compliance. LM4040DEM3X-5.0/NOPB is Active status, while the original part is Obsolete. For new designs, LM4040DEM3X-5.0/NOPB is the recommended choice.

Q: When should I use ADR5045BRTZ-REEL7 instead of a direct parametric equivalent?

A: ADR5045BRTZ-REEL7 is appropriate for precision applications requiring superior voltage accuracy (±0.1% vs. ±1%) and improved temperature stability (75 ppm/°C vs. 150 ppm/°C). This part is suitable for high-resolution data acquisition, precision instrumentation, and applications where reference voltage drift significantly impacts system performance.

Q: Is ZR40401F50TA suitable for my application requiring -40°C to 125°C operation?

A: No. ZR40401F50TA operates only to 85°C maximum temperature, making it incompatible with applications requiring the full -40°C to 125°C range of the original LM4040DEM3X-5.0. Select from Texas Instruments or Analog Devices alternatives that maintain the extended temperature range.

Q: What packaging options are available for equivalent parts?

A: All substitute parts maintain SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Packaging format options include Tape & Reel (TR) for automated assembly and Cut Tape & Digi-Reel for manual or small-volume applications. Verify your procurement and assembly process requirements when selecting between packaging variants.

Q: Are all substitute parts RoHS compliant?

A: Most active and recommended substitute parts are ROHS3 compliant. The original LM4040DEM3X-5.0 is RoHS non-compliant. For applications requiring regulatory compliance, select from Active status parts with ROHS3 certification: LM4040DEM3X-5.0/NOPB, LM4040D50QDBZR, LM4040D50QDBZT, ADR5045ARTZ-REEL7, ADR5045BRTZ-REEL7, or LM4040AEM3-5.0+T.

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