LM4040C30IDBZRG4 Equivalent & Substitute Parts

Part Overview

The LM4040C30IDBZRG4 is a shunt voltage reference IC from Texas Instruments, delivering a fixed 3V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, making direct equivalents and active substitutes necessary for new designs and production continuity. The LM4040 series provides precision voltage references suitable for analog circuit applications requiring stable reference voltages with low noise characteristics.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage	3V (Fixed)
Output Current	15 mA
Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	35 µVrms
Cathode Current	82 µA
Operating Temperature Range	-40°C to 85°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4040C30IDBZRG4 is determined by the following critical parameters:

Fixed Substitution Criteria:

Output voltage: 3V
Reference type: Shunt
Package: SOT-23-3
Output current: 15 mA
Mounting type: Surface Mount
RoHS and MSL compliance

Variable Parameters Affecting Substitution:

Tolerance (±0.1%, ±0.2%, ±0.5%, ±1%)
Temperature coefficient (100 ppm/°C or 150 ppm/°C)
Cathode current (65 µA to 82 µA)
Operating temperature range (-40°C to 85°C or -40°C to 125°C)
Product status (Active vs. Obsolete)
Packaging format (Tape & Reel, Cut Tape, Digi-Reel)

Substitutes are grouped by tolerance grade, with tighter tolerances (±0.1%) representing upgrades and looser tolerances (±1%) representing downgrades. Active product variants with identical electrical specifications are direct replacements.

Parameter Comparison

Part Number	Tolerance	Temp Coeff	Cathode Current	Temp Range	Status	Packaging
LM4040C30IDBZRG4	±0.5%	100 ppm/°C	82 µA	-40°C to 85°C	Obsolete	SOT-23-3
LM4040CIM3-3.0/NOPB	±0.5%	100 ppm/°C	65 µA	-40°C to 85°C	Active	SOT-23-3
LM4040C30IDBZR	±0.5%	100 ppm/°C	82 µA	-40°C to 85°C	Active	SOT-23-3
LM4040CEM3-3.0/NOPB	±0.5%	100 ppm/°C	70 µA	-40°C to 125°C	Active	SOT-23-3
LM4040CEM3X-3.0/NOPB	±0.5%	100 ppm/°C	70 µA	-40°C to 125°C	Active	SOT-23-3
LM4040AIM3-3.0/NOPB	±0.1%	100 ppm/°C	67 µA	-40°C to 85°C	Active	SOT-23-3
LM4040AIM3X-3.0/NOPB	±0.1%	100 ppm/°C	67 µA	-40°C to 85°C	Active	SOT-23-3
LM4040BIM3-3.0/NOPB	±0.2%	100 ppm/°C	67 µA	-40°C to 85°C	Active	SOT-23-3
LM4040BIM3X-3.0/NOPB	±0.2%	100 ppm/°C	67 µA	-40°C to 85°C	Active	SOT-23-3
LM4040DEM3-3.0/NOPB	±1%	150 ppm/°C	75 µA	-40°C to 125°C	Active	SOT-23-3
LM4040DIM3-3.0/NOPB	±1%	150 ppm/°C	70 µA	-40°C to 85°C	Active	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Same Tolerance Grade): LM4040C30IDBZR is the active equivalent of LM4040C30IDBZRG4, maintaining identical electrical specifications with ±0.5% tolerance and 82 µA cathode current. This part is recommended for direct substitution in existing designs.

Extended Temperature Range Option: LM4040CEM3-3.0/NOPB and LM4040CEM3X-3.0/NOPB maintain ±0.5% tolerance while extending the operating temperature range to -40°C to 125°C. These are suitable for applications requiring enhanced thermal performance.

Tighter Tolerance Upgrades: LM4040AIM3-3.0/NOPB and LM4040AIM3X-3.0/NOPB provide ±0.1% tolerance, offering improved accuracy for precision reference applications. LM4040BIM3-3.0/NOPB and LM4040BIM3X-3.0/NOPB provide ±0.2% tolerance as an intermediate option.

Looser Tolerance Alternative: LM4040DEM3-3.0/NOPB and LM4040DIM3-3.0/NOPB offer ±1% tolerance with extended temperature range (-40°C to 125°C for DEM3 variant), suitable for cost-sensitive applications with relaxed accuracy requirements.

All recommended substitutes are ROHS3 compliant with MSL rating 1 (Unlimited) and maintain the SOT-23-3 package format for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM4040CIM3-3.0/NOPB replace LM4040C30IDBZRG4 directly? A: Yes. Both maintain ±0.5% tolerance, 3V output, and SOT-23-3 packaging. The primary difference is cathode current (65 µA vs. 82 µA), which does not affect functional compatibility in standard applications.

Q: What is the difference between LM4040C30IDBZR and LM4040CIM3-3.0/NOPB? A: LM4040C30IDBZR uses Cut Tape & Digi-Reel packaging with 82 µA cathode current. LM4040CIM3-3.0/NOPB uses Tape & Reel packaging with 65 µA cathode current. Electrical performance is equivalent; packaging format differs.

Q: Can I use LM4040AIM3-3.0/NOPB (±0.1%) instead of the ±0.5% part? A: Yes. Tighter tolerance parts are functionally compatible and provide improved accuracy. No circuit modifications are required.

Q: Is LM4040DIM3-3.0/NOPB (±1%) suitable as a substitute? A: Yes, if the application tolerates ±1% accuracy. This represents a downgrade in precision but maintains the same 3V output and SOT-23-3 package.

Q: What does the "X" suffix in LM4040CEM3X-3.0/NOPB indicate? A: The "X" suffix denotes a variant in the product line. Electrical specifications remain identical to the non-X variant; packaging or manufacturing process may differ.

Q: Are all substitutes RoHS compliant? A: Yes. All listed substitutes are ROHS3 compliant with MSL rating 1 (Unlimited), meeting environmental and reliability standards.

Q: Can I interchange parts with different packaging formats (Tape & Reel vs. Cut Tape)? A: Yes, from an electrical standpoint. Packaging format affects handling and assembly processes but not component performance. Select based on your procurement and assembly requirements.

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