LM4040CIZ-5.0 Equivalent & Substitute Parts

Part Overview

The LM4040CIZ-5.0 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring a fixed 5V output. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The LM4040CIZ-5.0 operates as a shunt regulator with ±0.5% tolerance and is housed in a TO-92-3 package suitable for through-hole mounting applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM4040CIZ-5.0
Category	Power Management (PMIC)
Reference Type	Shunt
Output Voltage	5V (Fixed)
Output Current	15 mA
Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	80 µVrms
Cathode Current	80 µA
Operating Temperature Range	-40°C to 85°C
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM4040CIZ-5.0 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Reference Type: Shunt voltage reference
Output Voltage: 5V fixed output
Package Type: TO-92-3 through-hole configuration
Mounting Type: Through hole
Operating Temperature Range: -40°C to 85°C

Secondary Compatibility Parameters:

Output Current: 15 mA nominal
Tolerance: ±0.5% or tighter
Temperature Coefficient: 100 ppm/°C or lower
Noise Performance: 80 µVrms or lower (10Hz to 10kHz)

Parts are grouped into three categories:

Group 1 - Direct Equivalents (Identical Electrical Specifications): Parts with matching 5V output, ±0.5% tolerance, 15 mA output current, and identical temperature coefficient. These provide pin-for-pin and functional replacement.

Group 2 - Functional Equivalents (Same Output Voltage, Relaxed Tolerance): Parts with 5V output but tolerance specifications of ±1% or wider. These maintain voltage compatibility but with broader accuracy margins.

Group 3 - Alternative Reference Devices (Different Output Voltage or Current Rating): Parts with different output voltages or significantly different current ratings. These require circuit redesign and are suitable only when voltage adjustment or current scaling is acceptable.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Noise (10Hz-10kHz)	Cathode Current	Operating Temp	Package	Product Status	RoHS Status
LM4040CIZ-5.0	Texas Instruments	5V	15 mA	±0.5%	100 ppm/°C	80 µVrms	80 µA	-40°C to 85°C	TO-92-3	Obsolete	Non-Compliant
LM4040C50ILPE3	Texas Instruments	5V	15 mA	±0.5%	100 ppm/°C	80 µVrms	95 µA	-40°C to 85°C	TO-92-3	Active	ROHS3 Compliant
LM4040CIZ-5.0/NOPB	Texas Instruments	5V	15 mA	±0.5%	100 ppm/°C	80 µVrms	80 µA	-40°C to 85°C	TO-92-3	Active	ROHS3 Compliant
LM4040C50ILP	Texas Instruments	5V	15 mA	±0.5%	100 ppm/°C	80 µVrms	95 µA	-40°C to 85°C	TO-92-3	Active	ROHS3 Compliant
LM4040D50ILP	Texas Instruments	5V	15 mA	±1%	150 ppm/°C	80 µVrms	95 µA	-40°C to 85°C	TO-92-3	Active	ROHS3 Compliant
LT1634CCZ-5#PBF	Analog Devices Inc.	5V	30 mA	±0.2%	25 ppm/°C	35 µVp-p	15 µA	0°C to 70°C	TO-92-3	Active	ROHS3 Compliant
LM285Z-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150 ppm/°C	120 µVrms	20 µA	-40°C to 85°C	TO-92-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Group 1 - Recommended Direct Replacements (Active Status, RoHS Compliant):

LM4040CIZ-5.0/NOPB and LM4040C50ILPE3 are the primary recommended substitutes for the obsolete LM4040CIZ-5.0. Both parts maintain identical electrical specifications with 5V output, ±0.5% tolerance, and 100 ppm/°C temperature coefficient. LM4040CIZ-5.0/NOPB is available in bulk packaging with 2300 pcs in stock and carries ROHS3 compliance. LM4040C50ILPE3 is available with 602 pcs in stock and also meets ROHS3 requirements. The cathode current difference (95 µA vs. 80 µA) is within acceptable operating margins for most applications.

LM4040C50ILP provides an alternative with identical electrical performance and active product status. With 704 pcs in stock and ROHS3 compliance, this part is suitable for applications requiring the same precision and temperature stability as the original LM4040CIZ-5.0.

Group 2 - Functional Alternatives (Relaxed Tolerance):

LM4040D50ILP is an active substitute with 5V output and 15 mA current rating but with ±1% tolerance and 150 ppm/°C temperature coefficient. This part is appropriate for applications where the broader tolerance specification is acceptable. With 3320 pcs in stock and ROHS3 compliance, it provides good availability.

Group 3 - Alternative Reference Devices:

LT1634CCZ-5#PBF (Analog Devices) offers superior performance with ±0.2% tolerance, 25 ppm/°C temperature coefficient, and 30 mA output current. However, the operating temperature range is limited to 0°C to 70°C, which is narrower than the original part's -40°C to 85°C range. This part is suitable only for applications operating within the 0°C to 70°C window and where enhanced precision is required.

LM285Z-2.5/NOPB is not recommended as a direct substitute due to its 2.5V output voltage, which differs from the required 5V specification. This part requires circuit redesign and is applicable only when voltage adjustment is feasible.

Compliance Considerations:

The original LM4040CIZ-5.0 is RoHS non-compliant. All recommended active substitutes (LM4040CIZ-5.0/NOPB, LM4040C50ILPE3, LM4040C50ILP, LM4040D50ILP, and LT1634CCZ-5#PBF) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can LM4040C50ILPE3 be used as a direct replacement for LM4040CIZ-5.0?

A: Yes. LM4040C50ILPE3 is a direct functional equivalent with identical 5V output, ±0.5% tolerance, and 100 ppm/°C temperature coefficient. The cathode current specification differs slightly (95 µA vs. 80 µA), but this difference does not affect circuit operation in standard applications. The part is active and ROHS3 compliant.

Q: What is the difference between LM4040CIZ-5.0/NOPB and LM4040C50ILP?

A: Both parts have identical electrical specifications (5V output, ±0.5% tolerance, 100 ppm/°C). The primary differences are packaging format (bulk vs. bulk) and cathode current specification (80 µA vs. 95 µA). Both are active and ROHS3 compliant. Selection between these parts depends on inventory availability and packaging requirements.

Q: Why is LM4040D50ILP listed as a substitute if it has ±1% tolerance instead of ±0.5%?

A: LM4040D50ILP is classified as a functional alternative for applications where the broader ±1% tolerance specification is acceptable. It maintains the same 5V output voltage, 15 mA current rating, and TO-92-3 package. This part is suitable for less stringent precision requirements and offers good availability (3320 pcs in stock).

Q: Can LT1634CCZ-5#PBF replace LM4040CIZ-5.0 in all applications?

A: LT1634CCZ-5#PBF offers superior electrical performance with ±0.2% tolerance and 25 ppm/°C temperature coefficient. However, its operating temperature range is limited to 0°C to 70°C, compared to the original part's -40°C to 85°C range. This part is suitable only for applications operating within the narrower temperature window. Additionally, the 30 mA output current rating is higher than the original 15 mA specification.

Q: Is the original LM4040CIZ-5.0 still available for purchase?

A: The LM4040CIZ-5.0 is classified as obsolete. However, 2180 pcs are reported in stock. For new designs and long-term production, active substitutes such as LM4040CIZ-5.0/NOPB or LM4040C50ILPE3 are recommended to ensure continued component availability and compliance with current environmental standards.

Q: What does RoHS compliance mean for component selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates that the component meets environmental regulations restricting the use of specific hazardous materials. ROHS3 compliant parts are required for most new designs and production in regulated markets. The original LM4040CIZ-5.0 is RoHS non-compliant, while all recommended active substitutes are ROHS3 compliant.

Q: Can LM285Z-2.5/NOPB be used as a substitute?

A: LM285Z-2.5/NOPB is not a suitable direct substitute due to its 2.5V output voltage specification, which differs from the required 5V. This part is applicable only in applications where circuit redesign to accommodate a 2.5V reference voltage is feasible and acceptable.

Q: What is the significance of cathode current specifications in shunt voltage references?

A: Cathode current represents the minimum current required to maintain regulation in a shunt reference circuit. Variations in cathode current (ranging from 80 µA to 95 µA among the LM4040 variants) do not typically affect circuit operation in standard applications, as the shunt reference is designed to operate across a range of load conditions. The specified values remain within acceptable operating margins for most designs.

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