LM4041DEM3-ADJ Equivalent & Substitute Parts

Part Overview

The LM4041DEM3-ADJ is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component is classified as obsolete, though functionally equivalent active alternatives are available. The part delivers a fixed minimum output of 1.233V with adjustable maximum output up to 10V, operating across -40°C to 125°C with ±1% tolerance. Direct manufacturer substitutes and parametric equivalents from Texas Instruments, as well as cross-manufacturer alternatives, provide continuity for designs requiring shunt voltage reference functionality in SOT-23-3 packaging.

Key Parameters

Parameter	Value	Unit
Reference Type	Shunt	—
Output Type	Adjustable	—
Voltage - Output (Min/Fixed)	1.233V	V
Voltage - Output (Max)	10	V
Current - Output	12	mA
Tolerance	±1%	—
Temperature Coefficient	150	ppm/°C
Noise (10Hz to 10kHz)	20	µVrms
Current - Cathode	73	µA
Operating Temperature	-40°C to 125°C	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM4041DEM3-ADJ is determined by strict equivalence across the following critical parameters: reference type (shunt), output type (adjustable), voltage output range (1.233V minimum to 10V maximum), current output (12 mA), tolerance (±1%), temperature coefficient (150 ppm/°C), noise specification (20 µVrms at 10Hz to 10kHz), operating temperature range (-40°C to 125°C), and package format (SOT-23-3).

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (Texas Instruments): Parts with identical electrical specifications and active product status, differing only in packaging format (Cut Tape vs. Tape & Reel) or minor part number suffixes.

Parametric Equivalents (Texas Instruments): Parts meeting all core electrical specifications with minor variations in cathode current (70–80 µA vs. 73 µA) or packaging designation, maintaining full functional compatibility.

Cross-Manufacturer Alternatives: Parts from Microchip Technology, Diodes Incorporated, and STMicroelectronics meeting the same functional requirements, with tolerance and temperature coefficient variations noted where applicable.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Output (Min/Max)	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Packaging
LM4041DEM3-ADJ	Texas Instruments	Obsolete	1.233V / 10V	±1%	150 ppm/°C	73 µA	-40°C to 125°C	Cut Tape
LM4041DEM3-ADJ/NOPB	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	73 µA	-40°C to 125°C	Tape & Reel
LM4041DEM3X-ADJ/NOPB	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	73 µA	-40°C to 125°C	Tape & Reel
LM4041DQDBZR	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	80 µA	-40°C to 125°C	Tape & Reel
LM4041DQDBZT	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	80 µA	-40°C to 125°C	Tape & Reel
LM4041QDEM3-ADJ/NO	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	73 µA	-40°C to 125°C	Cut Tape
LM4041QDIM3-ADJ/NO	Texas Instruments	Active	1.233V / 10V	±1%	150 ppm/°C	70 µA	-40°C to 125°C	Tape & Reel
LM4041CYM3-ADJ-TR	Microchip Technology	Active	1.233V / 10V	±0.5%	100 ppm/°C	65 µA	-40°C to 85°C	Cut Tape
LM4041DADJFTA	Diodes Incorporated	Active	1.24V / 10V	±1%	150 ppm/°C	73 µA	-40°C to 125°C	Cut Tape
LM4041DYM3-ADJ-TR	Microchip Technology	Active	1.233V / 10V	±1%	150 ppm/°C	70 µA	-40°C to 85°C	Tape & Reel
TS432AILT	STMicroelectronics	Active	1.24V / 10V	±0.5%	100 ppm/°C	65 µA	-40°C to 85°C	Cut Tape

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LM4041DEM3-ADJ/NOPB is the primary active substitute, offering identical electrical performance with Tape & Reel packaging. This part maintains the same 73 µA cathode current, 150 ppm/°C temperature coefficient, and full -40°C to 125°C operating range as the original obsolete part.

For Automotive Applications: LM4041QDEM3-ADJ/NO and LM4041QDIM3-ADJ/NO are qualified to AEC-Q100 standard, suitable for automotive-grade designs. Both maintain core specifications with minor cathode current variations (73 µA and 70 µA respectively).

For Enhanced Tolerance and Temperature Stability: LM4041CYM3-ADJ-TR (Microchip Technology) and TS432AILT (STMicroelectronics) offer ±0.5% tolerance and 100 ppm/°C temperature coefficient, providing superior accuracy. Operating temperature is limited to -40°C to 85°C, which is acceptable for most commercial and industrial applications.

For Extended Temperature Range: LM4041DADJFTA (Diodes Incorporated) maintains the full -40°C to 125°C operating range with ±1% tolerance, though minimum output voltage is specified at 1.24V rather than 1.233V. This 0.007V difference is within typical application tolerances for adjustable reference circuits.

All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can LM4041DEM3-ADJ/NOPB be used as a direct replacement for the obsolete LM4041DEM3-ADJ?

A: Yes. LM4041DEM3-ADJ/NOPB is electrically identical to the original part, with the same voltage output range (1.233V to 10V), tolerance (±1%), temperature coefficient (150 ppm/°C), and operating temperature (-40°C to 125°C). The only difference is packaging format (Tape & Reel vs. Cut Tape), which does not affect circuit performance.

Q: What is the difference between LM4041DQDBZR and LM4041DQDBZT?

A: Both parts are parametrically equivalent with identical electrical specifications. The difference lies in packaging designation and reel format. Both maintain 1.233V to 10V output range, ±1% tolerance, and 150 ppm/°C temperature coefficient. Cathode current is 80 µA for both, slightly higher than the original 73 µA specification.

Q: Are the Microchip Technology alternatives (LM4041CYM3-ADJ-TR, LM4041DYM3-ADJ-TR) compatible with the original design?

A: Both Microchip parts are functionally compatible for the core voltage reference function. LM4041CYM3-ADJ-TR offers improved tolerance (±0.5% vs. ±1%) and lower temperature coefficient (100 ppm/°C vs. 150 ppm/°C), making it suitable for precision applications. However, operating temperature is limited to -40°C to 85°C. LM4041DYM3-ADJ-TR maintains ±1% tolerance and 150 ppm/°C coefficient with the same temperature limitation.

Q: Why do some substitutes have different minimum output voltages (1.24V vs. 1.233V)?

A: The minimum output voltage specification reflects manufacturer design tolerances. A 0.007V difference (1.24V vs. 1.233V) is negligible in adjustable reference circuits where the output is typically set via external resistor networks. Both values fall within the adjustable range and do not affect circuit functionality.

Q: Which substitute is best for automotive applications?

A: LM4041QDEM3-ADJ/NO and LM4041QDIM3-ADJ/NO are both AEC-Q100 qualified, making them suitable for automotive designs. Both maintain the full -40°C to 125°C operating range and ±1% tolerance. LM4041QDEM3-ADJ/NO has 73 µA cathode current, while LM4041QDIM3-ADJ/NO has 70 µA.

Q: Can TS432AILT from STMicroelectronics replace the LM4041DEM3-ADJ?

A: TS432AILT is functionally compatible for shunt voltage reference applications. It offers superior tolerance (±0.5%) and lower temperature coefficient (100 ppm/°C). The minimum output voltage is 1.24V, and operating temperature is limited to -40°C to 85°C. This part is suitable for precision applications within the reduced temperature range.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates "No Plumbum" (lead-free), confirming RoHS compliance. This designation is standard for modern components and does not affect electrical performance or compatibility.

Q: Are all substitute parts available in SOT-23-3 packaging?

A: Yes. All listed substitute parts are available in SOT-23-3 (TO-236-3, SC-59) surface-mount packaging, ensuring mechanical and electrical compatibility with the original design.

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