LM2941T/LB03 Equivalent & Substitute Parts

Part Overview

The LM2941T/LB03 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 1A output current with input voltage capability up to 26V and adjustable output voltage ranging from 5V to 20V. The device integrates protection features including over-temperature, reverse polarity, and short-circuit protection, with an enable control feature for power management flexibility.

The LM2941T/LB03 carries a "Not For New Designs" product status, indicating it is obsolete or in end-of-life phase. This necessitates identification of active substitute parts that maintain electrical and mechanical compatibility for ongoing production requirements and field replacements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Base Product Number	LM2941
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
Control Features	Enable
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the LM2941T/LB03 are identified based on strict electrical and mechanical parameter matching within the LM2941 product family. The substitution criteria are:

Identical base product number (LM2941)
Matching output configuration (Positive)
Matching output type (Adjustable)
Identical voltage specifications (Input Max: 26V, Output Min: 5V, Output Max: 20V)
Identical current rating (1A output)
Identical dropout voltage (1V @ 1A)
Identical package type (TO-220-5)
Identical control and protection features (Enable, Over Temperature, Reverse Polarity, Short Circuit)
Identical operating temperature range (-40°C ~ 125°C)

Parts meeting all these criteria are classified as direct functional equivalents. Packaging variant designations (NOPB, LF03) indicate different lead finish or tape/reel configurations but do not alter electrical performance or pinout compatibility.

Parameter Comparison

Parameter	LM2941T/LB03	LM2941T/NOPB	LM2941T/LF03
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Not For New Designs	Active	Active
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
Package / Case	TO-220-5 Formed Leads	TO-220-5	TO-220-5 Formed Leads
Control Features	Enable	Enable	Enable
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
Packaging	Tube	Tube	Tube

Engineering Selection Recommendations

Both LM2941T/NOPB and LM2941T/LF03 are direct electrical and mechanical equivalents to the LM2941T/LB03. Selection between these active alternatives is determined by compliance and regulatory requirements:

LM2941T/NOPB is recommended for applications requiring ROHS3 compliance with standard lead finish specifications. This variant maintains full electrical equivalence and is actively manufactured.

LM2941T/LF03 is recommended for applications requiring ROHS3 compliance with formed lead configuration. This variant provides identical electrical performance and is actively manufactured with formed lead geometry suitable for specific PCB assembly processes.

The LM2941T/LB03 should be phased out in new designs due to its "Not For New Designs" status and RoHS non-compliance. Existing inventory of LM2941T/LB03 may be used for field replacements of legacy equipment, but new production should transition to either LM2941T/NOPB or LM2941T/LF03 based on assembly and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Are LM2941T/NOPB and LM2941T/LF03 pin-for-pin compatible with LM2941T/LB03?

A: Yes. All three variants share identical TO-220-5 pinout and electrical characteristics. The suffix designations (LB03, NOPB, LF03) indicate packaging or lead finish variations only and do not affect pin configuration or functional operation.

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

A: Both are ROHS3 compliant active products with identical electrical specifications. The primary difference is lead configuration: NOPB uses standard leads while LF03 uses formed leads. Selection depends on PCB assembly equipment and process requirements.

Q: Can I use LM2941T/NOPB or LM2941T/LF03 as direct replacements in existing designs using LM2941T/LB03?

A: Yes. Both substitute parts are direct functional equivalents with matching electrical performance, output voltage range, current rating, protection features, and operating temperature specifications. PCB layout and circuit design require no modification.

Q: Why is LM2941T/LB03 marked "Not For New Designs"?

A: This status indicates the part is in end-of-life phase. Texas Instruments recommends transitioning to active alternatives such as LM2941T/NOPB or LM2941T/LF03 for new product development.

Q: Are there RoHS compliance differences between the three variants?

A: Yes. LM2941T/LB03 is RoHS non-compliant. Both LM2941T/NOPB and LM2941T/LF03 are ROHS3 compliant. For applications subject to RoHS regulations, use either NOPB or LF03 variant.

Q: What inventory levels are available for each variant?

A: LM2941T/LB03 has 772 pcs in stock. LM2941T/NOPB has 2300 pcs in stock. LM2941T/LF03 has 2741 pcs in stock. All are supplied in tube packaging.

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