LM2940CT-12 Equivalent & Substitute Parts

Part Overview

The LM2940CT-12 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 12V output at 1A in a TO-220-3 package. This device is classified as Last Time Buy, indicating discontinued production. The part provides positive fixed output regulation with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection. Finding equivalent and substitute parts is necessary due to the Last Time Buy status and to support design flexibility across manufacturing runs and supply chain optimization.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.8V @ 1A
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM2940CT-12 are selected based on the following criteria:

Fixed 12V output voltage
TO-220-3 package compatibility
Through-hole mounting
Maximum input voltage of 26V or greater
Operating temperature range of 0°C to 125°C or wider
RoHS3 compliance
Protection features including over-current and over-temperature protection

Substitutes are grouped by output current capability. The LM2940CT-12/NOPB is a direct equivalent from the same manufacturer. Microchip Technology alternatives (MIC series) provide equivalent or enhanced specifications with varying current ratings to support different load requirements while maintaining electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Package	Operating Temperature	Product Status
LM2940CT-12	Texas Instruments	12V	1A	26V	0.8V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy
LM2940CT-12/NOPB	Texas Instruments	12V	1A	26V	0.8V @ 1A	TO-220-3	0°C ~ 125°C	Active
MIC29150-12WT	Microchip Technology	12V	1.5A	26V	0.6V @ 1.5A	TO-220-3	-40°C ~ 125°C	Active
MIC2920A-12WT	Microchip Technology	12V	400mA	26V	0.75V @ 400mA	TO-220-3	-40°C ~ 125°C	Active
MIC29300-12WT	Microchip Technology	12V	3A	26V	0.6V @ 3A	TO-220-3	-40°C ~ 125°C	Active
MIC2937A-12WT	Microchip Technology	12V	750mA	26V	0.75V @ 750mA	TO-220-3	-40°C ~ 125°C	Active
MIC2940A-12WT	Microchip Technology	12V	1.25A	26V	0.6V @ 1.25A	TO-220-3	-40°C ~ 125°C	Active

Engineering Selection Recommendations

The LM2940CT-12/NOPB is the direct equivalent from Texas Instruments and maintains identical electrical specifications with Active product status, making it the primary substitute for the Last Time Buy LM2940CT-12.

Microchip Technology MIC series regulators provide active alternatives with enhanced specifications. Selection among MIC variants depends on load current requirements:

MIC2920A-12WT: 400mA output current for reduced-load applications
MIC2937A-12WT: 750mA output current for moderate-load applications
MIC2940A-12WT: 1.25A output current for applications requiring current above 1A
MIC29150-12WT: 1.5A output current for higher-load applications
MIC29300-12WT: 3A output current for maximum-load applications

All Microchip alternatives feature extended operating temperature range (-40°C to 125°C) compared to the original part (0°C to 125°C), improved voltage dropout characteristics, and RoHS3 compliance. All substitute parts maintain TO-220-3 package compatibility and through-hole mounting, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can MIC series regulators directly replace the LM2940CT-12 in existing designs?

A: Yes. All MIC series substitutes maintain identical 12V fixed output voltage, TO-220-3 package, and through-hole mounting. PCB layout and connections remain unchanged. Verify that the selected MIC variant's output current rating meets or exceeds your application's maximum load current.

Q: What is the difference between the various MIC output current ratings?

A: The MIC series offers multiple current ratings (400mA, 750mA, 1.25A, 1.5A, 3A) to match specific load requirements. Select the lowest current rating that exceeds your application's peak load current to optimize thermal performance and efficiency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The LM2940CT-12/NOPB and all MIC series alternatives are RoHS3 compliant, meeting environmental and regulatory requirements.

Q: How do voltage dropout specifications affect part selection?

A: Voltage dropout determines the minimum input voltage required to maintain regulated output. The LM2940CT-12 specifies 0.8V dropout at 1A. MIC series parts offer improved dropout (0.6V at rated current), allowing operation with lower input voltages or providing better efficiency in power-limited applications.

Q: What is the operating temperature range difference between Texas Instruments and Microchip alternatives?

A: The LM2940CT-12 operates from 0°C to 125°C. Microchip MIC series regulators extend the lower temperature limit to -40°C, supporting applications requiring cold-temperature operation.

Q: Are there inventory considerations for part selection?

A: Yes. The LM2940CT-12/NOPB has 30,755 pieces in stock (Active status), while MIC series alternatives have varying inventory levels. Consult current stock availability for supply chain planning.

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