LM4040C50IDBZRG4 Equivalent & Substitute Parts

Part Overview

The LM4040C50IDBZRG4 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 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 ongoing design support and production continuity. The device operates across -40°C to 85°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Voltage	5V Fixed
Output Current	15 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise (10Hz to 10kHz)	80µVrms
Cathode Current	95 µA
Operating Temperature Range	-40°C to 85°C
Package	SOT-23-3
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LM4040C50IDBZRG4 is determined by the following critical parameters: fixed 5V output voltage, ±0.5% tolerance, 15 mA output current capability, SOT-23-3 package, and surface mount configuration. Parts are grouped into three categories based on product status and performance characteristics:

Direct Substitutes maintain identical electrical specifications and active product status, enabling one-to-one replacement without design modification.

Upgrade Options provide enhanced performance through improved temperature coefficient (50ppm/°C vs. 100ppm/°C) or extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C), while maintaining core 5V output and ±0.5% tolerance.

Manufacturer Recommended Alternatives offer tighter tolerance specifications (±0.1% or ±0.2%) for applications requiring higher precision, with identical package and output voltage.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Tolerance	Temp Coefficient	Noise (10Hz-10kHz)	Cathode Current	Temp Range	Package
LM4040C50IDBZRG4	Texas Instruments	Obsolete	5V	±0.5%	100ppm/°C	80µVrms	95 µA	-40°C to 85°C	SOT-23-3
LM4050CIM3-5.0/NOPB	Texas Instruments	Active	5V	±0.5%	50ppm/°C	93µVrms	80 µA	-40°C to 85°C	SOT-23-3
LM4050CIM3X-5.0/NOPB	National Semiconductor	Active	5V	±0.5%	50ppm/°C	93µVrms	80 µA	-40°C to 85°C	SOT-23-3
LM4040CEM3-5.0/NOPB	Texas Instruments	Active	5V	±0.5%	100ppm/°C	80µVrms	83 µA	-40°C to 125°C	SOT-23-3
LM4040CEM3X-5.0/NOPB	Texas Instruments	Active	5V	±0.5%	100ppm/°C	80µVrms	83 µA	-40°C to 125°C	SOT-23-3
LM4050CEM3-5.0/NOPB	Texas Instruments	Active	5V	±0.5%	50ppm/°C	93µVrms	90 µA	-40°C to 125°C	SOT-23-3
LM4050CEM3X-5.0/NOPB	Texas Instruments	Active	5V	±0.5%	50ppm/°C	93µVrms	90 µA	-40°C to 125°C	SOT-23-3
LM4040AIM3-5.0/NOPB	Texas Instruments	Active	5V	±0.1%	100ppm/°C	80µVrms	80 µA	-40°C to 85°C	SOT-23-3
LM4040AIM3X-5.0/NOPB	Texas Instruments	Active	5V	±0.1%	100ppm/°C	80µVrms	80 µA	-40°C to 85°C	SOT-23-3
LM4040BIM3-5.0/NOPB	Texas Instruments	Active	5V	±0.2%	100ppm/°C	80µVrms	80 µA	-40°C to 85°C	SOT-23-3
LM4040BIM3X-5.0/NOPB	Texas Instruments	Active	5V	±0.2%	100ppm/°C	80µVrms	80 µA	-40°C to 85°C	SOT-23-3

Engineering Selection Recommendations

For direct replacement of the obsolete LM4040C50IDBZRG4, select LM4040CEM3-5.0/NOPB or LM4040CEM3X-5.0/NOPB. Both maintain identical electrical specifications with ±0.5% tolerance and 100ppm/°C temperature coefficient, while offering active product status and extended operating temperature range to 125°C. Both are ROHS3 compliant with unlimited moisture sensitivity rating.

For applications operating within the original -40°C to 85°C range where lower temperature coefficient is beneficial, LM4050CIM3-5.0/NOPB or LM4050CIM3X-5.0/NOPB provide 50ppm/°C performance with active status and ROHS3 compliance.

For precision-critical applications, LM4040AIM3-5.0/NOPB and LM4040AIM3X-5.0/NOPB deliver ±0.1% tolerance with identical package and temperature range. LM4040BIM3-5.0/NOPB and LM4040BIM3X-5.0/NOPB offer intermediate ±0.2% tolerance as a middle-ground option.

All recommended substitutes are surface mount SOT-23-3 devices with identical pinout and footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM4050 series parts directly replace LM4040C50IDBZRG4?

A: Yes. LM4050CIM3-5.0/NOPB and LM4050CIM3X-5.0/NOPB are direct electrical equivalents with identical 5V output, ±0.5% tolerance, and 15 mA output current. The primary difference is improved temperature coefficient (50ppm/°C vs. 100ppm/°C), which represents enhanced performance without design modification required.

Q: What is the difference between parts ending in /NOPB and those without?

A: The /NOPB designation indicates lead-free, RoHS compliant packaging. Both configurations are electrically identical and mechanically compatible in SOT-23-3 footprints.

Q: Are the X-suffix variants (e.g., LM4040CEM3X-5.0/NOPB) interchangeable with non-X versions?

A: Yes. The X-suffix indicates extended temperature range capability in some cases, but all variants maintain identical electrical specifications, package geometry, and pinout. Selection between X and non-X versions depends on packaging preference and inventory availability.

Q: Which substitute offers the best long-term availability?

A: LM4040CEM3-5.0/NOPB and LM4040CEM3X-5.0/NOPB carry the highest inventory levels (12,583 and 3,774 units respectively) with active product status, ensuring sustained supply for production continuity.

Q: Can higher tolerance parts (±0.1% or ±0.2%) be used in place of ±0.5% specifications?

A: Yes. Tighter tolerance parts are functionally compatible and represent improved performance. LM4040AIM3-5.0/NOPB (±0.1%) and LM4040BIM3-5.0/NOPB (±0.2%) are suitable for applications where the original ±0.5% tolerance is acceptable, with the benefit of enhanced accuracy.

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