LM2940T-12.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2940T-12.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 12V output at 1A current capacity in a TO-220-3 package. This part is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring 12V linear regulation with 1A output capability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	26V
Voltage Dropout (Max)	1V @ 1A
Package / Case	TO-220-3
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the LM2940T-12.0 are selected based on the following criteria:

Output voltage fixed at 12V
TO-220-3 package compatibility for direct pin-compatible replacement
Input voltage maximum of 26V
Operating temperature range of -40°C ~ 125°C
Through-hole mounting configuration
ROHS3 compliance and equivalent protection features

Substitutes are grouped by output current capacity. Parts with equal or greater current ratings can replace the LM2940T-12.0 in applications where the 1A specification is met or exceeded. Parts with lower current ratings are suitable only for applications with reduced current demands.

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage Dropout (Max)	Quiescent Current (Iq)	Product Status	REACH Status
LM2940T-12.0	Texas Instruments	1A	1V @ 1A	10 mA	Last Time Buy	REACH Affected
LM2940T-12.0/NOPB	Texas Instruments	1A	1V @ 1A	10 mA	Active	REACH Unaffected
MIC2920A-12WT	Microchip Technology	400mA	0.75V @ 400mA	300 µA	Active	REACH Unaffected
MIC2937A-12WT	Microchip Technology	750mA	0.75V @ 750mA	300 µA	Active	REACH Unaffected
MIC2940A-12WT	Microchip Technology	1.25A	0.6V @ 1.25A	500 µA	Active	REACH Unaffected
MIC29150-12WT	Microchip Technology	1.5A	0.6V @ 1.5A	Not Specified	Active	REACH Unaffected
MIC29300-12WT	Microchip Technology	3A	0.6V @ 3A	Not Specified	Active	REACH Unaffected

Engineering Selection Recommendations

LM2940T-12.0/NOPB is the primary direct substitute, offering identical electrical specifications with Active product status and REACH Unaffected compliance. This part maintains full compatibility with existing designs.

Microchip Technology MIC series regulators provide alternative solutions with varying current capacities. Selection depends on application current requirements:

MIC2920A-12WT: For applications requiring 400mA or less
MIC2937A-12WT: For applications requiring up to 750mA
MIC2940A-12WT: For applications requiring up to 1.25A with improved dropout voltage
MIC29150-12WT: For applications requiring up to 1.5A
MIC29300-12WT: For applications requiring up to 3A

All substitute parts maintain TO-220-3 package compatibility, 12V fixed output, 26V maximum input voltage, -40°C ~ 125°C operating range, and ROHS3 compliance. Microchip parts feature lower dropout voltages and improved quiescent current characteristics compared to the original LM2940T-12.0 specification.

Frequently Asked Questions (FAQ)

Q: Can MIC2920A-12WT replace LM2940T-12.0 in all applications?

A: MIC2920A-12WT is suitable only for applications with maximum current demand of 400mA. The LM2940T-12.0 is rated for 1A output. Use MIC2920A-12WT only when application current requirements do not exceed 400mA.

Q: What is the advantage of MIC2940A-12WT over LM2940T-12.0?

A: MIC2940A-12WT provides 1.25A output capacity with 0.6V dropout voltage compared to LM2940T-12.0's 1V dropout. Lower dropout voltage reduces power dissipation and heat generation in the regulator.

Q: Are all substitute parts pin-compatible with LM2940T-12.0?

A: All listed substitute parts use TO-220-3 package with identical pin configuration. Direct PCB replacement is possible without layout modification.

Q: Which substitute part has the lowest quiescent current?

A: MIC2920A-12WT and MIC2937A-12WT both specify 300 µA quiescent current, lower than LM2940T-12.0's 10 mA specification.

Q: Are all parts ROHS3 compliant?

A: All listed parts are ROHS3 compliant. The LM2940T-12.0 is REACH Affected; LM2940T-12.0/NOPB and all Microchip parts are REACH Unaffected.

Q: Can I use MIC29300-12WT as a direct replacement for 1A applications?

A: Yes. MIC29300-12WT rated for 3A output exceeds the 1A requirement. The part operates within specification for 1A load conditions with improved thermal performance due to higher current capacity.

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