MIC29372BU Equivalent & Substitute Parts

Part Overview

The MIC29372BU is a linear voltage regulator IC from Microchip Technology designed for positive adjustable output applications. It delivers 750mA output current in a TO-263-5 surface mount package and operates across an input voltage range of up to 26V with adjustable output from 1.24V to 26V. The device includes over-current and over-temperature protection with an enable control feature.

The MIC29372BU is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently using this regulator.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	26V
Current - Output	750mA
Voltage Dropout (Max)	0.75V @ 750mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the MIC29372BU is determined by the following critical parameters:

Package Compatibility: All substitutes must use TO-263-6 (D2PAK with 5 Leads + Tab) surface mount packaging to ensure PCB layout and thermal management compatibility.
Output Configuration: Positive adjustable output is required for functional equivalence.
Voltage Specifications: Input voltage rating of 26V maximum and adjustable output capability are essential for circuit operation.
Current Capacity: Output current rating must meet or exceed 750mA to support the original application load.
Protection Features: Over-current and over-temperature protection are baseline requirements.
Control Interface: Enable control feature must be present for system integration.

Substitute parts are grouped into two categories: direct equivalents from Microchip Technology and cross-manufacturer alternatives from Texas Instruments that meet the electrical and mechanical requirements.

Parameter Comparison

Parameter	MIC29372BU	MIC29372WU	LM2941CS/NOPB	LM2941CSX/NOPB	LP3965ESX-ADJ/NOPB
Manufacturer	Microchip	Microchip	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Package / Case	TO-263-5	TO-263-5	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Output Configuration	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V	26V	7V
Voltage - Output (Min/Fixed)	1.24V	1.24V	5V	5V	1.216V
Voltage - Output (Max)	26V	26V	20V	20V	5.1V
Current - Output	750mA	750mA	1A	1A	1.5A
Voltage Dropout (Max)	0.75V @ 750mA	0.75V @ 750mA	1V @ 1A	1V @ 1A	0.55V @ 1.5A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MIC29372WU is the primary direct equivalent. It is manufactured by Microchip Technology and maintains identical electrical specifications to the MIC29372BU while offering active product status and ROHS3 compliance. This part is recommended as the first choice for direct replacement in new production and redesign efforts.

LM2941CS/NOPB and LM2941CSX/NOPB are functionally compatible alternatives from Texas Instruments. Both deliver 1A output current, exceeding the 750mA requirement of the original design. The LM2941CSX/NOPB variant offers significantly higher inventory availability (81,438 units) compared to the tube-packaged LM2941CS/NOPB (2,100 units). Both parts are ROHS3 compliant and active products. Design consideration: these parts specify a minimum output voltage of 5V, which differs from the MIC29372BU's 1.24V minimum. Applications requiring output voltages below 5V cannot use these alternatives.

LP3965ESX-ADJ/NOPB is a higher-performance alternative from Texas Instruments. It delivers 1.5A output current and features superior dropout performance (0.55V @ 1.5A versus 0.75V @ 750mA). The device includes PSRR specification (60dB ~ 40dB at 120Hz) and comprehensive protection features. Design consideration: the maximum input voltage is limited to 7V, which is significantly lower than the 26V rating of the MIC29372BU. This part is suitable only for applications with input voltages not exceeding 7V.

All substitute parts maintain TO-263 (DDPAK-5) package compatibility, surface mount mounting type, and enable control functionality. Selection should be based on specific application voltage requirements, current demands, and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can MIC29372WU be used as a direct replacement for MIC29372BU?

A: Yes. MIC29372WU is a direct equivalent manufactured by Microchip Technology with identical electrical specifications, package type, and functional features. The primary difference is product status (active versus obsolete) and improved RoHS compliance.

Q: What are the key differences between the Microchip and Texas Instruments alternatives?

A: MIC29372WU maintains identical specifications to the original part. The Texas Instruments LM2941 series offers higher output current (1A) and additional protection features (reverse polarity protection). The LP3965ESX-ADJ/NOPB provides the highest output current (1.5A) and lowest dropout voltage but is limited to 7V maximum input voltage.

Q: Can LM2941CS/NOPB or LM2941CSX/NOPB replace the MIC29372BU in all applications?

A: These parts are compatible for applications requiring output voltages of 5V or higher. Applications requiring adjustable output below 5V cannot use the LM2941 series due to its 5V minimum output voltage specification. Both parts are otherwise electrically and mechanically compatible.

Q: Is the LP3965ESX-ADJ/NOPB suitable for high-voltage input applications?

A: No. The LP3965ESX-ADJ/NOPB is limited to 7V maximum input voltage, making it unsuitable for applications requiring the 26V input capability of the MIC29372BU. This part is appropriate only for low-voltage input designs.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use TO-263 (DDPAK-5) surface mount packaging, which is mechanically and thermally compatible with the original MIC29372BU TO-263-5 package. PCB layout modifications are not required for package compatibility.

Q: What compliance certifications apply to these substitute parts?

A: MIC29372WU, LM2941CS/NOPB, LM2941CSX/NOPB, and LP3965ESX-ADJ/NOPB are all ROHS3 compliant. The original MIC29372BU is RoHS non-compliant. All parts are REACH unaffected and classified under ECCN EAR99.

Q: Which substitute part offers the best inventory availability?

A: LM2941CSX/NOPB offers the highest inventory availability at 81,438 units in Cut Tape and Digi-Reel packaging. This part is suitable for applications with output voltage requirements of 5V or higher and input voltages up to 26V.

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