LM2941CT/LB03 Equivalent & Substitute Parts

Part Overview

The LM2941CT/LB03 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 1A output current in a TO-220-5 package and features integrated protection against over-temperature, reverse polarity, and short-circuit conditions. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	5V
Voltage - Output (Max)	20V
Voltage Dropout (Max)	1V @ 1A
Current - Output	1A
Current - Quiescent (Iq)	10 mA
Current - Supply (Max)	15 mA
Control Features	Enable
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-5 Formed Leads

Substitute Part Grouping Explanation

Substitution for the LM2941CT/LB03 is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage specifications (Input Max: 26V, Output Min: 5V, Output Max: 20V)
Current rating (1A output)
Dropout voltage (1V @ 1A)
Protection features (Over Temperature, Reverse Polarity, Short Circuit)
Package type (TO-220-5 Formed Leads)
Operating temperature range (0°C ~ 125°C)
Control features (Enable)

All substitute parts listed maintain identical electrical and mechanical specifications. Differences exist only in product status, RoHS compliance, and packaging format.

Parameter Comparison

Parameter	LM2941CT/LB03	LM2941CT/LF03	LM2941CT/NOPB	LM2941CT/LF04
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V	26V
Voltage - Output (Min/Fixed)	5V	5V	5V	5V
Voltage - Output (Max)	20V	20V	20V	20V
Voltage Dropout (Max)	1V @ 1A	1V @ 1A	1V @ 1A	1V @ 1A
Current - Output	1A	1A	1A	1A
Current - Quiescent (Iq)	10 mA	10 mA	10 mA	10 mA
Current - Supply (Max)	15 mA	15 mA	15 mA	15 mA
Control Features	Enable	Enable	Enable	Enable
Protection Features	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5	TO-220-5 Formed Leads
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	-	Tube	Tube	Tube

Engineering Selection Recommendations

All three substitute parts—LM2941CT/LF03, LM2941CT/NOPB, and LM2941CT/LF04—are electrically and mechanically equivalent to the LM2941CT/LB03. Selection among these active alternatives should be based on the following criteria:

RoHS Compliance: All substitute parts are ROHS3 compliant, whereas the original LM2941CT/LB03 is RoHS non-compliant. For applications requiring RoHS compliance, any of the three substitutes is suitable.

Product Status: The LM2941CT/LB03 is obsolete. The substitute parts are all active products with ongoing manufacturer support and availability.

Packaging and Inventory: LM2941CT/LF03, LM2941CT/NOPB, and LM2941CT/LF04 are supplied in tube packaging. Inventory levels vary: LM2941CT/NOPB offers the highest stock (2100 pcs), followed by LM2941CT/LF03 (1488 pcs) and LM2941CT/LF04 (977 pcs).

Frequently Asked Questions (FAQ)

Q: Can LM2941CT/LF03, LM2941CT/NOPB, and LM2941CT/LF04 be used interchangeably with LM2941CT/LB03?

A: Yes. All three parts are electrically and mechanically equivalent. They share identical voltage specifications, current ratings, dropout voltage, protection features, and operating temperature range. The primary differences are product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between the three substitute parts?

A: The three substitutes are functionally identical. Differences exist only in packaging format designation and inventory availability. All are supplied in tube packaging and are ROHS3 compliant.

Q: Is the TO-220-5 package the same across all parts?

A: Yes. All parts use the TO-220-5 package with formed leads, ensuring mechanical compatibility in through-hole applications.

Q: Why is the original LM2941CT/LB03 marked as obsolete?

A: The LM2941CT/LB03 has been discontinued by Texas Instruments. The active alternatives listed provide equivalent functionality for new designs and replacement applications.

Q: Are there any compliance differences I should consider?

A: The original LM2941CT/LB03 is RoHS non-compliant. All substitute parts are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: Can I use these parts in new designs?

A: Yes. The active substitute parts are recommended for new designs. They provide the same electrical performance as the obsolete original part with the added benefit of current manufacturer support and RoHS compliance.

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