LM4040DEM3-3.0 Equivalent & Substitute Parts

Part Overview

The LM4040DEM3-3.0 is a shunt voltage reference IC with fixed 3V output, ±1% tolerance, and 15 mA output current in SOT-23-3 surface mount packaging. This part is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	3V
Current - Output	15 mA
Tolerance	±1%
Temperature Coefficient	150ppm/°C
Noise - 10Hz to 10kHz	35µVrms
Current - Cathode	75 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM4040DEM3-3.0 are selected based on the following criteria:

Critical Parameters (Must Match):

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 3V
Current - Output: 15 mA
Package / Case: SOT-23-3
Mounting Type: Surface Mount

Allowable Variations:

Tolerance: ±0.1%, ±0.2%, ±0.5%, or ±1% (tighter tolerances are acceptable substitutes)
Temperature Coefficient: 100ppm/°C or 150ppm/°C
Current - Cathode: 75 µA or 82 µA
Operating Temperature: -40°C ~ 85°C or -40°C ~ 125°C (wider ranges are acceptable)
Product Status: Active parts are preferred over obsolete parts
RoHS Status: ROHS3 Compliant parts are preferred

Parameter Comparison

Part Number	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
LM4040DEM3-3.0	±1%	150	75	-40 ~ 125	Obsolete	Non-compliant	SOT-23-3
LM4040A30IDBZR	±0.1%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (CT)
LM4040A30IDBZT	±0.1%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040B30IDBZR	±0.2%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (CT)
LM4040B30IDBZT	±0.2%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040C30IDBZR	±0.5%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (CT)
LM4040C30IDBZT	±0.5%	100	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040C30QDBZR	±0.5%	100	82	-40 ~ 125	Active	ROHS3 Compliant	SOT-23-3 (CT)
LM4040C30QDBZT	±0.5%	100	82	-40 ~ 125	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040D30IDBZR	±1%	150	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (CT)
LM4040D30IDBZT	±1%	150	82	-40 ~ 85	Active	ROHS3 Compliant	SOT-23-3 (TR)

Engineering Selection Recommendations

Primary Substitutes (Exact Tolerance Match): LM4040D30IDBZR and LM4040D30IDBZT are direct functional equivalents with ±1% tolerance matching the original part. Both are active products with ROHS3 compliance. The difference between these variants is packaging format: IDBZR is Cut Tape (CT) & Digi-Reel, while IDBZT is Tape & Reel (TR).

Secondary Substitutes (Tighter Tolerance): LM4040C30QDBZR and LM4040C30QDBZT offer ±0.5% tolerance with extended operating temperature range (-40°C ~ 125°C), matching the original part's temperature specification. These are suitable for applications requiring improved accuracy.

LM4040B30IDBZR and LM4040B30IDBZT provide ±0.2% tolerance for applications requiring higher precision.

LM4040A30IDBZR and LM4040A30IDBZT deliver ±0.1% tolerance for the most demanding accuracy requirements.

Compliance Consideration: All substitute parts listed are ROHS3 compliant, whereas the original LM4040DEM3-3.0 is RoHS non-compliant. This compliance upgrade is beneficial for new designs and regulatory adherence.

Temperature Range Consideration: LM4040C30QDBZR and LM4040C30QDBZT maintain the full -40°C ~ 125°C operating range of the original part. Other active substitutes operate to -40°C ~ 85°C, which is acceptable for most applications but should be verified against design requirements.

Frequently Asked Questions (FAQ)

Q: Can I use LM4040A30IDBZR as a direct replacement for LM4040DEM3-3.0? A: Yes. Both parts share identical output voltage (3V), output current (15 mA), package (SOT-23-3), and reference type (shunt). The LM4040A30IDBZR has tighter tolerance (±0.1% vs ±1%), lower temperature coefficient (100ppm/°C vs 150ppm/°C), and is an active product with ROHS3 compliance. The operating temperature range is -40°C ~ 85°C versus -40°C ~ 125°C for the original part.

Q: What is the difference between IDBZR and IDBZT packaging variants? A: IDBZR denotes Cut Tape (CT) & Digi-Reel packaging, while IDBZT denotes Tape & Reel (TR) packaging. Both contain identical die and electrical specifications. The choice depends on assembly equipment compatibility and procurement volume requirements.

Q: Why do substitute parts have different cathode current specifications (75 µA vs 82 µA)? A: The original LM4040DEM3-3.0 specifies 75 µA cathode current, while active substitutes specify 82 µA. This minor variation is within normal manufacturing tolerance and does not affect circuit functionality for standard shunt reference applications.

Q: Is LM4040C30QDBZR a better choice than LM4040D30IDBZR? A: LM4040C30QDBZR offers ±0.5% tolerance with extended temperature range (-40°C ~ 125°C), matching the original part's temperature specification. LM4040D30IDBZR matches the original ±1% tolerance but operates to -40°C ~ 85°C. Selection depends on whether the application requires the full temperature range or can accept the reduced range.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed are ROHS3 compliant, whereas the original LM4040DEM3-3.0 is RoHS non-compliant. This represents an improvement in regulatory compliance for new production.

Q: Can I mix different tolerance grades in the same circuit? A: Yes, provided the circuit design accommodates the tolerance variation. Tighter tolerance parts (±0.1%, ±0.2%, ±0.5%) are functionally compatible with designs specified for ±1% tolerance.

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