LM4040DIM3-2.5 Equivalent & Substitute Parts

Part Overview

The LM4040DIM3-2.5 is a shunt voltage reference IC manufactured by Texas Instruments, providing a fixed 2.5V output with ±1% tolerance in a SOT-23-3 surface mount package. This part is classified as Last Time Buy, indicating limited availability. Equivalent and substitute parts are necessary to ensure design continuity, support alternative sourcing strategies, and accommodate varying performance requirements across different application specifications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	15 mA
Tolerance	±1%
Temperature Coefficient	150ppm/°C
Noise - 10Hz to 10kHz	35µVrms
Current - Cathode	70 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 eligibility is determined by the following critical parameters: reference type (shunt), output type (fixed), output voltage (2.5V), output current (15 mA), package type (SOT-23-3), and mounting type (surface mount). Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Substitutes: Parts with identical electrical specifications and packaging, differing only in tape format (Cut Tape vs. Tape & Reel).

Parametric Equivalents: Texas Instruments parts with identical core specifications but variations in cathode current (70 µA vs. 80 µA) or automotive qualification (AEC-Q100).

Manufacturer Recommended Alternatives: Parts from Analog Devices Inc. with superior performance characteristics (lower tolerance, lower temperature coefficient, lower noise) while maintaining the same output voltage, current rating, and package type.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff (ppm/°C)	Noise 10Hz-10kHz (µVrms)	Cathode Current (µA)	Operating Temp (°C)	Product Status	Packaging
LM4040DIM3-2.5	Texas Instruments	±1%	150	35	70	-40 ~ 85	Last Time Buy	Cut Tape (CT) & Digi-Reel®
LM4040DIM3-2.5/NOPB	Texas Instruments	±1%	150	35	70	-40 ~ 85	Active	Tape & Reel (TR)
LM4040D25IDBZR	Texas Instruments	±1%	150	35	80	-40 ~ 85	Active	Cut Tape (CT) & Digi-Reel®
LM4040D25IDBZT	Texas Instruments	±1%	150	35	80	-40 ~ 85	Active	Tape & Reel (TR)
LM4040DIM3X-2.5/NOPB	Texas Instruments	±1%	150	35	70	-40 ~ 85	Active	Cut Tape (CT) & Digi-Reel®
LM4040QDIM3-2.5/NOPB	Texas Instruments	±1%	150	35	70	-40 ~ 85	Active	Tape & Reel (TR)
LM4040QDIM3X2.5/NOPB	Texas Instruments	±1%	150	35	70	-40 ~ 85	Active	Tape & Reel (TR)
ADR5041ARTZ-REEL7	Analog Devices Inc.	±0.2%	100	150	60	-40 ~ 125	Active	Cut Tape (CT) & Digi-Reel®
ADR5041BRTZ-R2	Analog Devices Inc.	±0.1%	75	150	60	-40 ~ 125	Discontinued at DiGi Electronics	-
ADR5041BRTZ-REEL7	Analog Devices Inc.	±0.1%	75	150	60	-40 ~ 125	Active	Cut Tape (CT) & Digi-Reel®
LM4040AEM3-2.5+T	Analog Devices Inc./Maxim Integrated	±0.1%	100	35	65	-40 ~ 125	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Active Status): LM4040DIM3-2.5/NOPB, LM4040DIM3X-2.5/NOPB, LM4040QDIM3-2.5/NOPB, and LM4040QDIM3X2.5/NOPB are all active products with identical electrical specifications to the main part. These are suitable for immediate substitution with no circuit redesign required. The primary difference is packaging format (tape configuration) and automotive qualification in the Q-grade variants.

For Extended Temperature Range: LM4040AEM3-2.5+T and ADR5041 series parts support operating temperatures up to 125°C, compared to 85°C for the main part. These are appropriate for applications requiring extended thermal performance.

For Improved Accuracy: ADR5041BRTZ-REEL7 and ADR5041ARTZ-REEL7 offer superior tolerance (±0.1% and ±0.2% respectively) and lower temperature coefficient, suitable for precision reference applications. ADR5041BRTZ-R2 is not recommended due to discontinued status at DiGi Electronics.

For Automotive Applications: LM4040QDIM3-2.5/NOPB and LM4040QDIM3X2.5/NOPB carry AEC-Q100 qualification and are suitable for automotive-grade designs. LM4040AEM3-2.5+T also includes automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can LM4040D25IDBZR replace LM4040DIM3-2.5 directly? A: Yes, with one consideration. LM4040D25IDBZR has a cathode current of 80 µA compared to 70 µA in the main part. This 10 µA difference is within typical circuit tolerance for most applications but should be verified in designs with tight current budgeting.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Both formats contain identical components in SOT-23-3 packages. Cut Tape (CT) is supplied on individual tape segments, while Tape & Reel (TR) is supplied on continuous reels. Selection depends on assembly equipment and volume requirements.

Q: Are the Analog Devices ADR5041 parts pin-compatible? A: Yes, all substitute parts maintain the same SOT-23-3 package and pinout. However, ADR5041 parts have superior performance specifications (lower tolerance, lower noise, lower temperature coefficient) and extended operating temperature range to 125°C.

Q: Can I use LM4040AEM3-2.5+T in place of LM4040DIM3-2.5? A: Yes. LM4040AEM3-2.5+T is electrically compatible with improved specifications (±0.1% tolerance vs. ±1%, extended temperature range to 125°C). It is suitable for direct substitution with no circuit modifications required.

Q: Why is ADR5041BRTZ-R2 listed as discontinued? A: ADR5041BRTZ-R2 is discontinued at DiGi Electronics. Use ADR5041BRTZ-REEL7 as the active alternative, which offers identical electrical specifications with current availability.

Q: What does AEC-Q100 qualification mean? A: AEC-Q100 is an automotive qualification standard. Parts with this qualification (LM4040QDIM3 variants and LM4040AEM3-2.5+T) are tested and approved for automotive applications and extended temperature ranges.

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