LM2941T/LB08 Equivalent & Substitute Parts

Part Overview

The LM2941T/LB08 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This TO-220-5 package device delivers 1A output current with input voltage capability up to 26V and adjustable output voltage ranging from 5V to 20V. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-220-5
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	5V
Voltage - Output (Max)	20V
Current - Output	1A
Voltage Dropout (Max)	1V @ 1A
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Protection Features	Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM2941T/LB08 is determined by strict equivalence across the following electrical and mechanical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage specifications (Input Max: 26V, Output range: 5V–20V)
Current rating (1A output)
Voltage dropout (1V @ 1A)
Package type (TO-220-5)
Thermal and protection characteristics (Operating temperature -40°C ~ 125°C, Over Temperature/Reverse Polarity/Short Circuit protection)

The identified substitutes maintain identical electrical performance and physical form factor, enabling direct replacement in existing designs.

Parameter Comparison

Parameter	LM2941T/LB08	LM2941T/NOPB	LM2941T/LF03
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Package / Case	TO-220-5 Formed Leads	TO-220-5	TO-220-5 Formed Leads
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V
Voltage - Output (Min/Fixed)	5V	5V	5V
Voltage - Output (Max)	20V	20V	20V
Current - Output	1A	1A	1A
Voltage Dropout (Max)	1V @ 1A	1V @ 1A	1V @ 1A
Current - Quiescent (Iq)	10 mA	10 mA	10 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Protection Features	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both LM2941T/NOPB and LM2941T/LF03 provide complete electrical and mechanical equivalence to the obsolete LM2941T/LB08. Selection between these active alternatives should be based on the following factors:

LM2941T/NOPB is the manufacturer-recommended substitute, offering ROHS3 compliance and MSL 1 rating with unlimited moisture exposure tolerance. This part is available in tube packaging and maintains the highest compliance posture for new designs and production environments with stringent regulatory requirements.

LM2941T/LF03 is a parametric equivalent with identical electrical specifications and ROHS3 compliance. This variant features TO-220-5 formed leads and MSL 1 rating, providing equivalent performance characteristics for applications requiring the formed lead configuration.

Both substitutes are active products with superior compliance profiles compared to the obsolete original part, making either suitable for direct replacement in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can LM2941T/NOPB and LM2941T/LF03 be used interchangeably with LM2941T/LB08?

A: Yes. Both substitutes maintain identical electrical parameters including voltage specifications (26V input max, 5V–20V adjustable output), current rating (1A), dropout voltage (1V @ 1A), and protection features. The TO-220-5 package ensures mechanical compatibility with existing PCB layouts.

Q: What is the difference between LM2941T/NOPB and LM2941T/LF03?

A: Both parts are electrically and functionally identical. The primary difference is the lead formation: LM2941T/NOPB uses standard TO-220-5 leads, while LM2941T/LF03 uses formed leads. Both achieve ROHS3 compliance and MSL 1 rating. Selection depends on specific PCB assembly requirements and lead configuration preferences.

Q: Why is the original LM2941T/LB08 classified as obsolete?

A: The LM2941T/LB08 is marked obsolete by the manufacturer. Active alternatives LM2941T/NOPB and LM2941T/LF03 provide superior compliance certifications (ROHS3 vs. non-compliant) and improved moisture sensitivity ratings (MSL 1 vs. MSL 3), making them the preferred choices for ongoing production.

Q: Are there any compliance differences between the substitute parts and the original?

A: Yes. The original LM2941T/LB08 is RoHS non-compliant with MSL 3 rating (168 hours). Both substitutes achieve ROHS3 compliance with MSL 1 rating (unlimited moisture exposure), providing enhanced environmental and regulatory compliance for modern manufacturing and deployment environments.

Q: Can these parts be used in high-reliability applications?

A: Both LM2941T/NOPB and LM2941T/LF03 include protection features for over temperature, reverse polarity, and short circuit conditions. Compliance with ROHS3 and MSL 1 ratings supports deployment in controlled manufacturing and storage environments. Application-specific reliability requirements should be evaluated against the provided electrical and thermal specifications.

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