LM4040CIM3-2.0 Equivalent & Substitute Parts

Part Overview

The LM4040CIM3-2.0 is a shunt voltage reference IC from Texas Instruments, delivering a fixed 2.048V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This device is classified as Last Time Buy, indicating discontinued production. The LM4040CIM3-2.0 operates across the industrial temperature range of -40°C to 85°C and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Alternative models are necessary due to the Last Time Buy status of the original part number. Direct substitutes and parametric equivalents are available from the same manufacturer with identical or superior electrical characteristics and active product status.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.048V
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
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Direct Substitutes maintain identical electrical specifications (2.048V output, 15 mA output current, SOT-23-3 package, -40°C to 85°C operating range) with only packaging format differences (Tape & Reel vs. Cut Tape).

Manufacturer Recommended Substitutes offer improved tolerance specifications (±0.1%, ±0.2%, ±1%) while maintaining the same output voltage, current rating, package type, and operating temperature range. These parts feature increased cathode current (80 µA vs. 65 µA) and active product status.

Parametric Equivalents provide identical electrical performance to the original part (±0.5% tolerance, 2.048V, 15 mA, 100ppm/°C) with different packaging options and active availability.

All substitute parts are manufactured by Texas Instruments, share the same base product number (LM4040), and maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Part Number	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Packaging	Product Status
LM4040CIM3-2.0	±0.5%	100	65	-40 ~ 85	Tape & Reel (TR)	Last Time Buy
LM4040CIM3-2.0/NOPB	±0.5%	100	65	-40 ~ 85	Tape & Reel (TR)	Active
LM4040A20IDBZR	±0.1%	100	80	-40 ~ 85	Cut Tape (CT) & Digi-Reel®	Active
LM4040A20IDBZT	±0.1%	100	80	-40 ~ 85	Tape & Reel (TR)	Active
LM4040B20IDBZR	±0.2%	100	80	-40 ~ 85	Tape & Reel (TR)	Active
LM4040B20IDBZT	±0.2%	100	80	-40 ~ 85	Tape & Reel (TR)	Active
LM4040D20IDBZR	±1%	150	80	-40 ~ 85	Cut Tape (CT) & Digi-Reel®	Active
LM4040D20IDBZT	±1%	150	80	-40 ~ 85	Cut Tape (CT) & Digi-Reel®	Active
LM4040D20QDBZR	±1%	150	80	-40 ~ 125	Tape & Reel (TR)	Active
LM4040D20QDBZT	±1%	150	80	-40 ~ 125	Tape & Reel (TR)	Active
LM4040C20IDBZR	±0.5%	100	80	-40 ~ 85	Cut Tape (CT) & Digi-Reel®	Active

Engineering Selection Recommendations

Direct Replacement: LM4040CIM3-2.0/NOPB is the primary direct substitute, offering identical electrical and mechanical specifications with active product status and significantly higher inventory availability (59,964 units vs. 2,670 units).

Improved Tolerance Applications: The LM4040A20IDBZT provides ±0.1% tolerance with active status and Tape & Reel packaging, suitable for applications requiring tighter voltage reference accuracy. The LM4040B20IDBZR offers ±0.2% tolerance as an intermediate option.

Extended Temperature Range: LM4040D20QDBZR and LM4040D20QDBZT extend the operating temperature to -40°C to 125°C, accommodating high-temperature environments while maintaining ±1% tolerance and active product status.

Packaging Flexibility: Cut Tape (CT) & Digi-Reel® options (LM4040C20IDBZR, LM4040A20IDBZR) are available for applications requiring smaller quantity handling or alternative reel formats.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and SOT-23-3 package compatibility with the original LM4040CIM3-2.0.

Frequently Asked Questions (FAQ)

Q: Can LM4040CIM3-2.0/NOPB be used as a direct replacement for LM4040CIM3-2.0?

A: Yes. Both parts share identical electrical specifications (2.048V, ±0.5%, 15 mA, 100ppm/°C), operating temperature range (-40°C to 85°C), and SOT-23-3 package. The /NOPB variant has active product status and higher inventory availability.

Q: What is the difference between the tolerance grades (A, B, C, D)?

A: Tolerance grades define output voltage accuracy: LM4040A (±0.1%), LM4040B (±0.2%), LM4040C (±0.5%), and LM4040D (±1%). The original LM4040CIM3-2.0 is grade C (±0.5%). Higher grades (A, B) provide tighter accuracy; lower grades (D) provide wider tolerance.

Q: Are there differences in cathode current between the original and substitutes?

A: The original LM4040CIM3-2.0 specifies 65 µA cathode current. Most active substitutes (A, B, D grades) specify 80 µA. This difference does not affect functional compatibility in standard applications.

Q: Which substitute supports the highest operating temperature?

A: LM4040D20QDBZR and LM4040D20QDBZT extend the upper operating temperature to 125°C (vs. 85°C for the original). These parts are designated with the "Q" suffix indicating the extended range.

Q: What packaging options are available?

A: Substitutes are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats. All maintain the SOT-23-3 physical package. Selection depends on production volume and handling requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity level, matching the original part's environmental certifications.

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