MIC37252BU TR Equivalent & Substitute Parts

Part Overview

The MIC37252BU TR is a linear voltage regulator IC from Microchip Technology designed for positive adjustable output applications. This Surface Mount device delivers 2.5A output current in a TO-263-5 package configuration. The part is currently classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across voltage regulation, dropout characteristics, and thermal performance parameters while accommodating modern supply chain availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC37252BU TR
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Package / Case	TO-263-5 (D2PAK, 5 Leads + Tab)
Output Configuration	Positive Adjustable
Current - Output	2.5A
Voltage - Input (Max)	6V
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	5.5V
Voltage Dropout (Max)	1V @ 2.5A
Operating Temperature	-40°C ~ 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output Configuration: Positive Adjustable
Voltage - Output (Min/Fixed): 1.24V minimum
Voltage - Output (Max): 5.5V maximum
Current - Output: Minimum 2.5A
Voltage Dropout: Maximum 1V @ 2.5A
Control Features: Enable function required
Protection Features: Over Current, Over Temperature, Reverse Polarity

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: TO-263-5 (D2PAK, 5 Leads + Tab)

Compliance Considerations:

RoHS Status: Modern substitutes should be RoHS3 Compliant
Moisture Sensitivity Level: MSL 3 or better
Operating Temperature: -40°C ~ 125°C minimum range

Substitute parts are grouped into two categories: Direct Microchip Technology alternatives and manufacturer-recommended cross-references from Analog Devices Inc. All listed substitutes meet or exceed the electrical and mechanical requirements of the MIC37252BU TR.

Parameter Comparison

Parameter	MIC37252BU TR	MIC37252WU-TR	LT1764AMPQ#PBF	LT1764EQ#PBF
Manufacturer	Microchip Technology	Microchip Technology	Analog Devices Inc.	Analog Devices Inc.
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Current - Output	2.5A	2.5A	3A	3A
Voltage - Input (Max)	6V	6V	20V	20V
Voltage - Output (Min/Fixed)	1.24V	1.24V	1.21V	1.21V
Voltage - Output (Max)	5.5V	5.5V	20V	20V
Voltage Dropout (Max)	1V @ 2.5A	1V @ 2.5A	0.66V @ 3A	0.66V @ 3A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-5	TO-263-5	TO-263-5	TO-263-5
Control Features	Enable	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 3 (168 Hours)	MSL 1 (Unlimited)	MSL 1 (Unlimited)

Engineering Selection Recommendations

MIC37252WU-TR (Microchip Technology)

This is the direct Microchip Technology equivalent with identical electrical specifications and TO-263-5 package compatibility. The MIC37252WU-TR maintains the same 2.5A output current, 1V dropout voltage, and adjustable output range as the obsolete MIC37252BU TR. The primary advantage is Active product status with ROHS3 compliance and improved supply chain availability. This part is the preferred first choice for direct replacement in existing designs.

LT1764AMPQ#PBF and LT1764EQ#PBF (Analog Devices Inc.)

Both LT1764 variants from Analog Devices Inc. provide enhanced electrical performance characteristics suitable for the MIC37252BU TR application space. These parts deliver 3A output current (exceeding the 2.5A requirement), lower dropout voltage of 0.66V @ 3A, and extended input voltage range to 20V. Both maintain TO-263-5 package compatibility and include identical protection features. The LT1764AMPQ#PBF supports extended temperature range to -55°C, while the LT1764EQ#PBF operates within -40°C ~ 125°C. Both are ROHS3 compliant with MSL 1 rating, providing superior moisture handling compared to the original part. These alternatives are suitable when enhanced performance margins or wider input voltage tolerance are beneficial to system design.

Frequently Asked Questions (FAQ)

Q: Can MIC37252WU-TR directly replace MIC37252BU TR without circuit modifications?

A: Yes. The MIC37252WU-TR is electrically and mechanically identical to the MIC37252BU TR. Both parts share the same output current rating (2.5A), dropout voltage (1V @ 2.5A), adjustable output range (1.24V to 5.5V), and TO-263-5 package configuration. No circuit redesign is required.

Q: What are the key differences between the Microchip and Analog Devices substitutes?

A: The MIC37252WU-TR maintains exact electrical parity with the original part. The LT1764 variants (AMPQ and EQ) offer enhanced specifications: 3A output current versus 2.5A, lower dropout voltage (0.66V versus 1V), and extended input voltage range (20V versus 6V). All three maintain TO-263-5 package compatibility and identical control/protection features.

Q: Are the LT1764 parts suitable for applications designed for 2.5A output?

A: Yes. The LT1764 parts are rated for 3A output, which exceeds the 2.5A requirement of the original design. The lower dropout voltage (0.66V @ 3A) provides improved thermal performance. These parts are electrically compatible and can be used as direct substitutes in existing circuits.

Q: What is the impact of RoHS compliance on part selection?

A: The original MIC37252BU TR is RoHS non-compliant. Both the MIC37252WU-TR and LT1764 variants are ROHS3 compliant, meeting current environmental and regulatory standards. For new designs or production requiring RoHS compliance, the MIC37252WU-TR or LT1764 variants are required.

Q: How do moisture sensitivity levels affect handling and storage?

A: The MIC37252BU TR and MIC37252WU-TR are rated MSL 3 (168 Hours), requiring controlled storage conditions. The LT1764 variants are rated MSL 1 (Unlimited), allowing indefinite storage without moisture control measures. MSL 1 parts provide greater flexibility in supply chain management and reduce bake-out requirements before assembly.

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

A: Yes. All listed substitutes (MIC37252WU-TR, LT1764AMPQ#PBF, and LT1764EQ#PBF) are available in TO-263-5 package configuration, ensuring mechanical compatibility with existing PCB layouts and assembly processes. Packaging differences exist only in supplier delivery format (Tape & Reel versus Tube), which does not affect component functionality or board-level integration.

Q: What is the temperature operating range consideration for substitute selection?

A: The original MIC37252BU TR operates -40°C ~ 125°C. The MIC37252WU-TR maintains this range. The LT1764AMPQ#PBF extends the lower limit to -55°C for enhanced cold-temperature performance. The LT1764EQ#PBF matches the original -40°C ~ 125°C range. Select based on specific application temperature requirements.

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