LM4041DIM7-1.2 Equivalent & Substitute Parts

Part Overview

The LM4041DIM7-1.2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications. This component generates a fixed 1.225V output with ±1% tolerance and operates across the industrial temperature range of -40°C to 85°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same output voltage, package form factor (SC-70-5), and core electrical characteristics while offering improved tolerance grades and active product status.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4041DIM7-1.2
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage (Fixed)	1.225V
Output Current	12 mA
Tolerance	±1%
Temperature Coefficient	150 ppm/°C
Noise (10Hz to 10kHz)	20 µVrms
Cathode Current	70 µA
Operating Temperature Range	-40°C to 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM4041DIM7-1.2 are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Output voltage: 1.225V (fixed)
Output current: 12 mA
Package / Case: 5-TSSOP, SC-70-5, SOT-353
Reference type: Shunt
Mounting type: Surface Mount

Secondary Selection Factors:

Tolerance grade (±1%, ±0.2%, ±0.5%, ±0.1%)
Temperature coefficient (50 ppm/°C to 150 ppm/°C)
Operating temperature range (-40°C to 85°C or -40°C to 125°C)
Cathode current (65 µA to 80 µA)
Product status (Active vs. Obsolete)
RoHS compliance (ROHS3 Compliant vs. non-compliant)

All substitute parts maintain identical output voltage and package specifications. Tolerance and temperature coefficient variations allow selection based on application precision requirements. Active product status and RoHS3 compliance are available across the LM4041 and TL4051 series.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Cathode Current	Operating Temp Range	Package	Product Status	RoHS Status
LM4041DIM7-1.2	Texas Instruments	1.225V	12 mA	±1%	150 ppm/°C	70 µA	-40°C to 85°C	SC-70-5	Obsolete	RoHS non-compliant
LM4041DIM7-1.2/NOPB	Texas Instruments	1.225V	12 mA	±1%	150 ppm/°C	70 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant
LM4041A12IDCKR	Texas Instruments	1.225V	12 mA	±0.1%	100 ppm/°C	80 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant
LM4041B12IDCKR	Texas Instruments	1.225V	12 mA	±0.2%	100 ppm/°C	80 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant
LM4041C12IDCKR	Texas Instruments	1.225V	12 mA	±0.5%	100 ppm/°C	80 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant
TL4051A12QDCKR	Texas Instruments	1.225V	12 mA	±0.1%	50 ppm/°C	65 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
TL4051B12IDCKR	Texas Instruments	1.225V	12 mA	±0.2%	50 ppm/°C	65 µA	-40°C to 85°C	SC-70-5	Discontinued at DiGi Electronics	ROHS3 Compliant
TL4051B12QDCKR	Texas Instruments	1.225V	12 mA	±0.2%	50 ppm/°C	65 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
TL4051B12QDCKT	Texas Instruments	1.225V	12 mA	±0.2%	50 ppm/°C	65 µA	-40°C to 125°C	SC-70-5	Discontinued at DiGi Electronics	ROHS3 Compliant
TL4051C12IDCKR	Texas Instruments	1.225V	12 mA	±0.5%	50 ppm/°C	65 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant
TL4051C12QDCKR	Texas Instruments	1.225V	12 mA	±0.5%	50 ppm/°C	65 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Pin-Compatible, Identical Specifications): LM4041DIM7-1.2/NOPB is the direct successor to the obsolete LM4041DIM7-1.2. This part maintains identical electrical specifications (±1% tolerance, 150 ppm/°C temperature coefficient) and package configuration while offering active product status and ROHS3 compliance. This is the preferred choice for designs requiring no circuit modifications.

Improved Tolerance Grade Substitutes (LM4041 Series): The LM4041A12IDCKR, LM4041B12IDCKR, and LM4041C12IDCKR parts provide tighter tolerance grades (±0.1%, ±0.2%, ±0.5% respectively) with reduced temperature coefficient (100 ppm/°C) compared to the original part. These remain within the -40°C to 85°C operating range and are fully compatible with existing PCB layouts. All three are active products with ROHS3 compliance.

Extended Temperature Range Substitutes (TL4051 Series): The TL4051 series offers superior temperature stability (50 ppm/°C) and extended operating range to -40°C to 125°C. TL4051A12QDCKR (±0.1%), TL4051B12QDCKR (±0.2%), and TL4051C12QDCKR (±0.5%) are active products suitable for applications requiring wider temperature performance. These parts are ROHS3 compliant and available in standard packaging.

Product Status Considerations: All recommended substitutes carry active product status except TL4051B12IDCKR, TL4051B12QDCKT, which are discontinued at DiGi Electronics. For long-term supply assurance, prioritize parts marked as Active. All substitute parts comply with ROHS3 regulations, addressing the non-compliance status of the original LM4041DIM7-1.2.

Frequently Asked Questions (FAQ)

Q: Can I use LM4041DIM7-1.2/NOPB as a direct replacement for LM4041DIM7-1.2? A: Yes. LM4041DIM7-1.2/NOPB is electrically and mechanically identical to the obsolete part, with the same 1.225V output, ±1% tolerance, and SC-70-5 package. The primary differences are active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between the LM4041 and TL4051 series? A: Both series provide 1.225V shunt voltage references in SC-70-5 packages. The TL4051 series offers superior temperature stability (50 ppm/°C vs. 100 ppm/°C for LM4041) and extended operating temperature range to 125°C. The LM4041 series is suitable for standard industrial applications (-40°C to 85°C), while TL4051 is preferred for high-temperature environments.

Q: Does tolerance grade affect pin compatibility? A: No. All substitute parts maintain identical pin configuration and SC-70-5 package geometry. Tolerance grades (±1%, ±0.2%, ±0.5%, ±0.1%) reflect internal circuit design but do not affect physical or electrical interface compatibility. Selection should be based on application precision requirements.

Q: Are all substitute parts RoHS compliant? A: All recommended substitute parts are ROHS3 compliant. The original LM4041DIM7-1.2 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed substitutes satisfy this criterion.

Q: Which substitute offers the best temperature stability? A: The TL4051 series provides the lowest temperature coefficient at 50 ppm/°C, compared to 100-150 ppm/°C for LM4041 variants. TL4051A12QDCKR, TL4051B12QDCKR, and TL4051C12QDCKR are recommended for applications requiring minimal voltage drift across temperature variations.

Q: Can I use a tighter tolerance part (±0.1%) in place of the original ±1% part? A: Yes. Tighter tolerance parts (LM4041A12IDCKR at ±0.1% or TL4051A12QDCKR at ±0.1%) are functionally compatible and provide improved voltage accuracy. These parts are pin-compatible and require no circuit modifications. The tighter tolerance represents an enhancement to the original design.

Q: What is the significance of the cathode current difference between parts? A: Cathode current (70 µA for LM4041DIM7-1.2 vs. 65-80 µA for substitutes) represents the minimum operating current through the reference element. Differences within this range do not affect circuit compatibility. Ensure the application circuit can supply the specified minimum cathode current for proper operation.

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