LM4040CIM3-3.0 Equivalent & Substitute Parts

Part Overview

The LM4040CIM3-3.0 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 3V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This device operates across -40°C to 85°C and is classified as Last Time Buy, indicating end-of-life status. Substitute parts are necessary to ensure design continuity and long-term component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	3V
Current - Output	15 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	35µVrms
Current - Cathode	65 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4040CIM3-3.0 is determined by the following critical parameters:

Reference Type & Output Type: All substitutes must be shunt voltage references with fixed 3V output
Voltage Output & Tolerance: 3V fixed output is mandatory; tolerance variations (±0.1%, ±0.2%, ±0.5%, ±1%) define performance tiers
Package Compatibility: SOT-23-3 package is required for direct PCB compatibility
Temperature Range: Operating temperature determines application suitability; extended range (-40°C to 125°C) provides broader operational capability
Current Specifications: Output current (15 mA) and cathode current must remain consistent for circuit functionality
Compliance: RoHS3 compliance and MSL rating must be maintained

Substitute parts are grouped by tolerance grade (A-series ±0.1%, B-series ±0.2%, C-series ±0.5%, D-series ±1%) and packaging format (IDBZR/IDBZT for tape & reel, QDBZR/QDBZT for alternative tape formats).

Parameter Comparison

Part Number	Tolerance	Temp Coeff (ppm/°C)	Operating Temp	Cathode Current (µA)	Product Status	Packaging
LM4040CIM3-3.0	±0.5%	100	-40°C ~ 85°C	65	Last Time Buy	Tape & Reel (TR)
LM4040C30QDBZR	±0.5%	100	-40°C ~ 125°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040C30QDBZT	±0.5%	100	-40°C ~ 125°C	82	Active	Tape & Reel (TR)
LM4040A30IDBZR	±0.1%	100	-40°C ~ 85°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040A30IDBZT	±0.1%	100	-40°C ~ 85°C	82	Active	Tape & Reel (TR)
LM4040B30IDBZR	±0.2%	100	-40°C ~ 85°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040B30IDBZT	±0.2%	100	-40°C ~ 85°C	82	Active	Tape & Reel (TR)
LM4040D30IDBZR	±1%	150	-40°C ~ 85°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040D30IDBZT	±1%	150	-40°C ~ 85°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040D30QDBZR	±1%	150	-40°C ~ 125°C	82	Active	Cut Tape (CT) & Digi-Reel®
LM4040C30IDBZR	±0.5%	100	-40°C ~ 85°C	82	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Direct Replacement (Same Tolerance & Temperature Range): LM4040C30IDBZR is the primary parametric equivalent, offering identical electrical specifications to the LM4040CIM3-3.0 with active product status and improved availability. Both maintain ±0.5% tolerance, 100ppm/°C temperature coefficient, and -40°C to 85°C operating range.

Extended Temperature Range Upgrade: LM4040C30QDBZR and LM4040C30QDBZT extend the operating temperature to -40°C to 125°C while maintaining ±0.5% tolerance, suitable for applications requiring broader thermal performance.

Higher Precision Alternatives: LM4040A30IDBZR and LM4040A30IDBZT provide ±0.1% tolerance for precision reference applications, with active status and equivalent temperature range to the original part.

Lower Precision Options: LM4040B30IDBZR, LM4040B30IDBZT, LM4040D30IDBZR, LM4040D30IDBZT, and LM4040D30QDBZR offer relaxed tolerance specifications (±0.2% to ±1%) for cost-sensitive applications where precision requirements are less stringent.

All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and SOT-23-3 package compatibility. Selection should be based on tolerance requirements, temperature operating range, and packaging format (tape & reel vs. cut tape).

Frequently Asked Questions (FAQ)

Q: Can LM4040C30IDBZR directly replace LM4040CIM3-3.0 in existing designs? A: Yes. Both parts share identical electrical specifications: 3V fixed output, ±0.5% tolerance, 100ppm/°C temperature coefficient, 15 mA output current, and SOT-23-3 package. The primary difference is product status (Active vs. Last Time Buy) and packaging format availability.

Q: What is the difference between tolerance grades (A, B, C, D)? A: Tolerance grades define output voltage accuracy: A-series ±0.1%, B-series ±0.2%, C-series ±0.5%, D-series ±1%. Higher precision (lower tolerance) grades are suitable for precision analog circuits; lower precision grades are acceptable for general reference applications.

Q: Does extended temperature range (-40°C to 125°C) affect circuit compatibility? A: Extended temperature range does not affect circuit compatibility. Parts rated to -40°C to 125°C (such as LM4040C30QDBZR and LM4040D30QDBZR) are suitable for applications requiring broader thermal operation and are backward compatible with designs specified for -40°C to 85°C.

Q: What is the significance of packaging format differences (IDBZR vs. QDBZR)? A: IDBZR indicates Cut Tape (CT) & Digi-Reel® packaging; QDBZR indicates alternative tape format. Both are surface mount compatible in SOT-23-3 package. Selection depends on procurement and assembly line requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original LM4040CIM3-3.0.

Q: What is the cathode current difference between the original part (65 µA) and substitutes (82 µA)? A: The cathode current specification differs between the original part and active substitutes. This parameter affects minimum load current requirements in circuit design. Verify circuit design compatibility when substituting parts with different cathode current specifications.

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