LM2940CS-12 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2940CS-12 is a positive fixed linear voltage regulator IC manufactured by Texas Instruments, rated for 12V output at 1A maximum current in a TO-263 (DDPAK-3) surface mount package. This device is classified as Last Time Buy status, indicating limited availability from the original manufacturer. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications requiring 12V regulated power delivery.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Maximum Output Current	1A
Maximum Input Voltage	26V
Maximum Dropout Voltage	0.8V @ 1A
Quiescent Current	10 mA
Package Type	TO-263-3 (D2PAK, 3 Leads + Tab)
Operating Temperature Range	0°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM2940CS-12 is determined by the following critical parameters: fixed 12V output voltage, TO-263-3 package compatibility, positive output configuration, and surface mount mounting type. Substitute parts must maintain electrical compatibility within the specified input voltage range (maximum 26V), output current capability (minimum 1A), and thermal operating range. Packaging variants (Tube versus Tape & Reel) are interchangeable for the same electrical device. Substitute parts are grouped by output current rating, dropout voltage performance, and manufacturer source.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Max Input Voltage	Dropout Voltage	Package	Operating Temp	Product Status
LM2940CS-12	Texas Instruments	12V	1A	26V	0.8V @ 1A	TO-263-3	0°C to 125°C	Last Time Buy
LM2940CS-12/NOPB	Texas Instruments	12V	1A	26V	0.8V @ 1A	TO-263-3	0°C to 125°C	Active
MIC2940A-12WU	Microchip Technology	12V	1.25A	26V	0.6V @ 1.25A	TO-263-3	-40°C to 125°C	Active
MIC2940A-12WU-TR	Microchip Technology	12V	1.25A	26V	0.6V @ 1.25A	TO-263-3	-40°C to 125°C	Active
MIC29150-12WU	Microchip Technology	12V	1.5A	26V	0.6V @ 1.5A	TO-263-3	-40°C to 125°C	Active
MIC29150-12WU-TR	Microchip Technology	12V	1.5A	26V	0.6V @ 1.5A	TO-263-3	-40°C to 125°C	Active
MIC29300-12WU	Microchip Technology	12V	3A	26V	0.6V @ 3A	TO-263-3	-40°C to 125°C	Active
MIC29300-12WU-TR	Microchip Technology	12V	3A	26V	0.6V @ 3A	TO-263-3	-40°C to 125°C	Active
MIC2937A-12WU	Microchip Technology	12V	750mA	26V	0.75V @ 750mA	TO-263-3	-40°C to 125°C	Active
MIC2937A-12WU-TR	Microchip Technology	12V	750mA	26V	0.75V @ 750mA	TO-263-3	-40°C to 125°C	Active

Engineering Selection Recommendations

LM2940CS-12/NOPB is the direct equivalent from Texas Instruments with identical electrical specifications and Active product status, providing the most straightforward replacement path. Microchip Technology MIC2940A-12WU and MIC2940A-12WU-TR offer 1.25A output current with improved dropout voltage (0.6V versus 0.8V) and extended operating temperature range (-40°C to 125°C), suitable for applications requiring enhanced thermal performance. MIC29150-12WU and MIC29150-12WU-TR provide 1.5A output current for designs with higher current demands. MIC29300-12WU and MIC29300-12WU-TR deliver 3A output current for applications requiring significant current headroom. MIC2937A-12WU and MIC2937A-12WU-TR are suitable only for applications with maximum current requirements not exceeding 750mA. All substitute parts maintain ROHS3 compliance and TO-263-3 package compatibility. Packaging variants (Tube versus Tape & Reel) are electrically identical and selection depends on assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can MIC2940A-12WU replace LM2940CS-12 in existing designs? A: Yes. Both devices deliver 12V fixed output in TO-263-3 packages with identical input voltage ratings (26V maximum). The MIC2940A-12WU provides higher output current (1.25A versus 1A) and lower dropout voltage (0.6V versus 0.8V), making it a direct functional replacement. Extended operating temperature range (-40°C to 125°C versus 0°C to 125°C) provides additional design margin.

Q: What is the difference between MIC29150-12WU and MIC29300-12WU? A: Both are Microchip Technology 12V regulators in TO-263-3 packages with identical input voltage specifications. The primary difference is output current rating: MIC29150-12WU is rated for 1.5A maximum current, while MIC29300-12WU is rated for 3A maximum current. Selection depends on application current requirements.

Q: Are Tube and Tape & Reel packaging variants electrically equivalent? A: Yes. Tube and Tape & Reel variants (identified by -TR suffix) contain identical die and electrical specifications. Packaging selection is determined by assembly process requirements and handling equipment compatibility, not electrical performance.

Q: Can MIC2937A-12WU be used as a substitute for LM2940CS-12? A: MIC2937A-12WU is suitable only for applications where maximum output current does not exceed 750mA. The LM2940CS-12 is rated for 1A output current. Using MIC2937A-12WU in designs requiring 1A output would exceed device ratings and is not recommended.

Q: What compliance certifications apply to all substitute parts? A: All listed substitute parts maintain ROHS3 compliance and identical HTSUS classification (8542.39.0001). REACH status varies by manufacturer: Texas Instruments LM2940CS-12/NOPB is REACH Unaffected, while all Microchip Technology substitutes are REACH Unaffected.

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