LM4040DIM3-3.0 Equivalent & Substitute Parts

Part Overview

The LM4040DIM3-3.0 is a shunt voltage reference IC from Texas Instruments, delivering a fixed 3V output with ±1% 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 LM4040 series provides precision voltage reference functionality for analog circuits requiring stable reference voltages across industrial temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4040DIM3-3.0
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage	3V (Fixed)
Output Current	15 mA
Voltage Tolerance	±1%
Temperature Coefficient	150 ppm/°C
Noise (10Hz to 10kHz)	35 µVrms
Cathode Current	70 µA
Operating Temperature	-40°C to 85°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM4040DIM3-3.0 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 3V fixed
Output current capability: 15 mA minimum
Package type: SOT-23-3 (identical pinout and footprint)
Reference type: Shunt configuration

Acceptable Variation Parameters:

Voltage tolerance: ±1% or tighter (±0.1%, ±0.2%, ±0.5% are acceptable)
Temperature coefficient: 150 ppm/°C or lower (100 ppm/°C is acceptable)
Cathode current: 70 µA to 82 µA (within operational margin)
Operating temperature range: -40°C to 85°C minimum (extended to 125°C is acceptable)

Compliance Considerations:

RoHS3 compliance preferred for new designs
Product status: Active preferred over obsolete

Substitute parts must maintain identical electrical output characteristics and physical package compatibility. Tighter tolerances and lower temperature coefficients represent performance improvements and are functionally compatible.

Parameter Comparison

Part Number	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
LM4040DIM3-3.0	±1%	150	70	-40 to 85	Obsolete	Non-compliant	SOT-23-3
LM4040DIM3-3.0/NOPB	±1%	150	70	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040D30QDBZR	±1%	150	82	-40 to 125	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040A30IDBZR	±0.1%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040A30IDBZT	±0.1%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040B30IDBZR	±0.2%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040B30IDBZT	±0.2%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040C30IDBZR	±0.5%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040C30IDBZT	±0.5%	100	82	-40 to 85	Active	ROHS3 Compliant	SOT-23-3 (TR)
LM4040C30QDBZR	±0.5%	100	82	-40 to 125	Active	ROHS3 Compliant	SOT-23-3 (CT & Digi-Reel)
LM4040C30QDBZT	±0.5%	100	82	-40 to 125	Active	ROHS3 Compliant	SOT-23-3 (TR)

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LM4040DIM3-3.0/NOPB is the primary direct substitute. It maintains the original ±1% tolerance and 150 ppm/°C temperature coefficient while offering active product status and ROHS3 compliance. This part is suitable for direct board-level substitution without circuit redesign.

Performance-Enhanced Alternatives: LM4040D30QDBZR provides extended operating temperature range (-40°C to 125°C) while maintaining ±1% tolerance, making it suitable for applications requiring broader thermal operation. LM4040A30IDBZR and LM4040A30IDBZT offer superior ±0.1% tolerance and 100 ppm/°C temperature coefficient for precision-critical applications. LM4040B30IDBZR and LM4040B30IDBZT provide ±0.2% tolerance as a mid-range option. LM4040C30IDBZR, LM4040C30IDBZT, LM4040C30QDBZR, and LM4040C30QDBZT offer ±0.5% tolerance with extended temperature range options.

Packaging Considerations: Cut Tape (CT) & Digi-Reel packaging is standard for production volumes. Tape & Reel (TR) packaging variants (IDBZT, QDBZT) are available for automated assembly processes. All parts maintain SOT-23-3 footprint compatibility.

Compliance Status: All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can LM4040DIM3-3.0 be replaced with LM4040DIM3-3.0/NOPB? A: Yes. Both parts are electrically identical with ±1% tolerance, 150 ppm/°C temperature coefficient, and SOT-23-3 packaging. The /NOPB variant is the active production version with ROHS3 compliance.

Q: What is the difference between tolerance grades (A, B, C, D)? A: Tolerance grades indicate output voltage accuracy: D-grade (±1%), C-grade (±0.5%), B-grade (±0.2%), and A-grade (±0.1%). All grades are functionally compatible in SOT-23-3 packages with identical pinouts. Tighter tolerance grades provide superior voltage accuracy.

Q: Can I use LM4040A30IDBZR in place of LM4040DIM3-3.0? A: Yes. The A-grade part offers superior ±0.1% tolerance and 100 ppm/°C temperature coefficient, both tighter than the original ±1% and 150 ppm/°C. It is a performance upgrade with identical 3V output and SOT-23-3 package.

Q: What is the difference between IDBZR and IDBZT packaging? A: IDBZR denotes Cut Tape (CT) & Digi-Reel packaging for manual or semi-automated assembly. IDBZT denotes Tape & Reel (TR) packaging for fully automated pick-and-place assembly. Electrical specifications are identical.

Q: Are extended temperature range parts (Q-grade, -40°C to 125°C) compatible? A: Yes. Extended temperature range parts (LM4040D30QDBZR, LM4040C30QDBZR, LM4040C30QDBZT) maintain identical 3V output and SOT-23-3 packaging. They are suitable for applications requiring operation beyond 85°C.

Q: Is the LM4040DIM3-3.0 still available? A: The original LM4040DIM3-3.0 is classified as obsolete. LM4040DIM3-3.0/NOPB is the active production equivalent with identical electrical specifications.

Q: What does cathode current variation (70 µA vs. 82 µA) mean for circuit design? A: Cathode current represents the minimum operating current through the reference element. The variation from 70 µA to 82 µA is within normal operational margin and does not affect circuit compatibility. Both values ensure stable voltage reference operation.

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