LM4040CIM7-4.1 Equivalent & Substitute Parts

Part Overview

The LM4040CIM7-4.1 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±0.5% tolerance. This device operates as a precision voltage reference in power management applications, packaged in SC-70-5 (5-TSSOP, SOT-353) surface mount configuration. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility while meeting current design requirements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	4.096V
Current - Output	15 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	80µVrms
Current - Cathode	73 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	5-TSSOP, SC-70-5, SOT-353
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM4040CIM7-4.1 is determined by the following critical parameters:

Reference output voltage: 4.096V (fixed)
Output current capability: 15 mA
Package type: SC-70-5 (5-TSSOP, SOT-353)
Mounting configuration: Surface Mount
Compliance standards: ROHS3, REACH Unaffected

Substitute parts are grouped into three categories based on tolerance and temperature coefficient specifications:

Direct Equivalents maintain the ±0.5% tolerance specification with compatible electrical characteristics.

Upgraded Tolerance Parts offer tighter tolerance (±0.1% to ±0.2%) with enhanced temperature stability, suitable for applications requiring higher precision.

Extended Temperature Range Parts extend operating temperature to -40°C ~ 125°C, accommodating industrial and automotive environments beyond the original -40°C ~ 85°C range.

All substitute candidates maintain identical output voltage, current rating, and package configuration, ensuring mechanical and electrical interchangeability within the specified parameter constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Current Output	Tolerance	Temp Coeff	Noise 10Hz-10kHz	Cathode Current	Operating Temp	Package
LM4040CIM7-4.1	Texas Instruments	Obsolete	4.096V	15 mA	±0.5%	100ppm/°C	80µVrms	73 µA	-40°C ~ 85°C	SC-70-5
TL4050C41IDCKR	Texas Instruments	Active	4.096V	15 mA	±0.5%	50ppm/°C	93µVrms	73 µA	-40°C ~ 85°C	SC-70-5
TL4050C41QDCKR	Texas Instruments	Active	4.096V	15 mA	±0.5%	50ppm/°C	93µVrms	78 µA	-40°C ~ 125°C	SC-70-5
TL4050C41QDCKT	Texas Instruments	Active	4.096V	15 mA	±0.5%	50ppm/°C	93µVrms	78 µA	-40°C ~ 125°C	SC-70-5
LM4040A41IDCKR	Texas Instruments	Active	4.096V	15 mA	±0.1%	100ppm/°C	80µVrms	88 µA	-40°C ~ 85°C	SC-70-5
LM4040B41IDCKR	Texas Instruments	Active	4.096V	15 mA	±0.2%	100ppm/°C	80µVrms	88 µA	-40°C ~ 85°C	SC-70-5
LM4040D41IDCKR	Texas Instruments	Active	4.096V	15 mA	±1%	150ppm/°C	80µVrms	88 µA	-40°C ~ 85°C	SC-70-5
TL4050A41QDCKR	Texas Instruments	Active	4.096V	15 mA	±0.1%	50ppm/°C	93µVrms	78 µA	-40°C ~ 125°C	SC-70-5
TL4050B41IDCKR	Texas Instruments	Active	4.096V	15 mA	±0.2%	50ppm/°C	93µVrms	73 µA	-40°C ~ 85°C	SC-70-5
TL4050B41IDCKT	Texas Instruments	Active	4.096V	15 mA	±0.2%	50ppm/°C	93µVrms	73 µA	-40°C ~ 85°C	SC-70-5
TL4050B41QDCKR	Texas Instruments	Discontinued at DiGi Electronics	4.096V	15 mA	±0.2%	50ppm/°C	93µVrms	78 µA	-40°C ~ 125°C	SC-70-5

Engineering Selection Recommendations

Primary Direct Equivalent (Same Tolerance): TL4050C41IDCKR is the recommended direct substitute, maintaining ±0.5% tolerance specification identical to the LM4040CIM7-4.1. This part is active and ROHS3 compliant with identical package configuration. The TL4050 series offers improved temperature coefficient (50ppm/°C vs. 100ppm/°C), providing superior thermal stability within the same tolerance band.

Extended Temperature Range Alternatives: TL4050C41QDCKR and TL4050C41QDCKT extend operating temperature to -40°C ~ 125°C while maintaining ±0.5% tolerance. These parts are suitable for applications requiring industrial or automotive temperature ranges. Both are active and ROHS3 compliant.

Higher Precision Options: LM4040A41IDCKR and TL4050A41QDCKR offer ±0.1% tolerance for applications requiring tighter voltage accuracy. TL4050A41QDCKR additionally provides extended temperature range (-40°C ~ 125°C) with improved temperature coefficient (50ppm/°C).

Intermediate Tolerance Selection: LM4040B41IDCKR and TL4050B41IDCKR provide ±0.2% tolerance as a middle ground between standard and precision specifications. TL4050B41IDCKR offers lower cathode current (73 µA) matching the original part specification.

Lower Tolerance Alternative: LM4040D41IDCKR offers ±1% tolerance for cost-sensitive applications where tighter accuracy is not required. This part maintains the original temperature coefficient specification (150ppm/°C).

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can TL4050C41IDCKR directly replace LM4040CIM7-4.1 without circuit modification?

A: Yes. Both parts maintain identical output voltage (4.096V), current rating (15 mA), and SC-70-5 package configuration. The ±0.5% tolerance specification is equivalent. The improved temperature coefficient (50ppm/°C vs. 100ppm/°C) in the TL4050 series provides enhanced performance without requiring design changes.

Q: What is the difference between TL4050C41QDCKR and TL4050C41QDCKT?

A: Both parts are electrically identical with ±0.5% tolerance and extended temperature range (-40°C ~ 125°C). The designation suffix indicates packaging format differences. Selection depends on procurement and assembly requirements.

Q: Should I use TL4050A41QDCKR instead of TL4050C41IDCKR?

A: TL4050A41QDCKR offers tighter tolerance (±0.1% vs. ±0.5%) and extended temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). Selection depends on application accuracy requirements and operating environment. If the original ±0.5% tolerance is sufficient, TL4050C41IDCKR is the direct equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the regulatory profile of the original LM4040CIM7-4.1.

Q: What is the significance of cathode current differences among substitute parts?

A: Cathode current values (73 µA to 88 µA) reflect minor design variations between part families. These differences are within normal operating parameters and do not affect functional substitution. Selection based on cathode current is only necessary if the application has specific power consumption constraints.

Q: Can I use LM4040D41IDCKR as a substitute if cost is a primary concern?

A: LM4040D41IDCKR is electrically compatible with ±1% tolerance specification. This part is suitable only if the application tolerates looser voltage accuracy. Verify that the ±1% tolerance band does not violate circuit performance requirements before selection.

Q: Why is TL4050B41QDCKR listed as discontinued at DiGi Electronics?

A: TL4050B41QDCKR remains available from Texas Instruments but is no longer stocked by DiGi Electronics. Availability through alternative distributors should be confirmed. Active alternatives with equivalent specifications include TL4050B41IDCKR and TL4050B41IDCKT.

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