MIC29372BU TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC29372BU TR is a linear voltage regulator IC manufactured by Microchip Technology, classified as a Power Management (PMIC) component. This device functions as a positive adjustable output regulator with 750mA current capacity in a TO-263-5 surface mount package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across critical electrical parameters including output voltage range, current capacity, dropout voltage, and thermal characteristics.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	26V
Current - Output	750mA
Voltage Dropout (Max)	0.75V @ 750mA
Current - Quiescent (Iq)	300 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Control Features	Enable
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution logic for the MIC29372BU TR is based on the following critical parameters that must be maintained or exceeded:

Primary Compatibility Criteria:

Output configuration: Positive adjustable
Package type: TO-263-5 (D2PAK with 5 leads)
Mounting type: Surface mount
Voltage output range: Minimum 1.24V to maximum 26V
Current output capacity: Minimum 750mA
Dropout voltage: Maximum 0.75V @ 750mA
Operating temperature range: -40°C to 125°C
Control features: Enable function
Protection: Over current and over temperature protection

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalent (Microchip Series): MIC29372WU TR maintains identical electrical specifications and package configuration. This part differs only in product status (active vs. obsolete) and RoHS compliance level.

Category 2 - Functional Substitutes (Higher Performance): LM2941CSX/NOPB and LP3965ESX-ADJ/NOPB provide equivalent or superior performance characteristics. These parts maintain the same package footprint and core functionality while offering enhanced current capacity or improved dropout voltage performance.

Parameter Comparison

Parameter	MIC29372BU TR	MIC29372WU TR	LM2941CSX/NOPB	LP3965ESX-ADJ/NOPB
Manufacturer	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V	7V
Voltage - Output (Min)	1.24V	1.24V	5V	1.216V
Voltage - Output (Max)	26V	26V	20V	5.1V
Current - Output	750mA	750mA	1A	1.5A
Voltage Dropout (Max)	0.75V @ 750mA	0.75V @ 750mA	1V @ 1A	0.55V @ 1.5A
Current - Quiescent (Iq)	300 µA	300 µA	10 mA	9 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-5	TO-263-5	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

MIC29372WU TR - Recommended Primary Substitute

The MIC29372WU TR is the direct equivalent replacement for the obsolete MIC29372BU TR. This part maintains identical electrical specifications, package configuration, and thermal characteristics. The primary distinction is product status: MIC29372WU TR is currently active in production with ROHS3 compliance certification, whereas the original part is obsolete and RoHS non-compliant. For new designs or production continuity, MIC29372WU TR provides seamless compatibility with existing PCB layouts and circuit designs without modification. Inventory availability is confirmed at 5311 pieces.

LM2941CSX/NOPB - Higher Current Capacity Alternative

The LM2941CSX/NOPB from Texas Instruments provides a functional substitute with enhanced current output capacity of 1A compared to the original 750mA specification. This part maintains the same TO-263 package footprint and positive adjustable output configuration. The maximum input voltage remains at 26V, and the operating temperature range extends to 0°C minimum (versus -40°C on the original). This substitute is suitable for applications where the additional 250mA current margin provides design headroom. The higher quiescent current (10mA vs. 300µA) and increased dropout voltage (1V @ 1A) should be evaluated against specific application requirements. ROHS3 compliance and active product status are confirmed.

LP3965ESX-ADJ/NOPB - Low Dropout Voltage Alternative

The LP3965ESX-ADJ/NOPB from Texas Instruments offers superior dropout voltage performance at 0.55V @ 1.5A, compared to 0.75V @ 750mA on the original part. This device provides the highest current capacity at 1.5A and maintains the same TO-263 package footprint. However, the maximum input voltage is limited to 7V and output voltage range is constrained to 1.216V to 5.1V. This substitute is applicable only to applications operating within these voltage constraints. The lower quiescent current (9mA) and comprehensive protection features (over current, over temperature, short circuit) provide enhanced reliability. ROHS3 compliance and active product status are confirmed.

All substitute parts maintain identical moisture sensitivity levels (MSL 3, 168 hours) and surface mount mounting type. Selection should be based on specific application voltage requirements, current demands, and thermal operating conditions.

Frequently Asked Questions (FAQ)

Q1: Can MIC29372WU TR be used as a direct replacement for MIC29372BU TR without PCB modifications?

A: Yes. MIC29372WU TR is the direct equivalent with identical electrical specifications and TO-263-5 package configuration. No PCB layout changes are required. The parts are pin-compatible and functionally equivalent. The primary difference is product status (active vs. obsolete) and RoHS compliance certification.

Q2: What are the key differences between the Microchip MIC29372WU TR and the Texas Instruments LM2941CSX/NOPB?

A: Both parts use the same TO-263 package footprint and provide positive adjustable output regulation. The LM2941CSX/NOPB offers higher current capacity (1A vs. 750mA) but has a higher dropout voltage (1V @ 1A vs. 0.75V @ 750mA). The LM2941CSX/NOPB also has a narrower operating temperature range (0°C to 125°C vs. -40°C to 125°C) and higher quiescent current (10mA vs. 300µA). Selection depends on application current requirements and temperature operating conditions.

Q3: Is the LP3965ESX-ADJ/NOPB suitable for all applications using the MIC29372BU TR?

A: No. The LP3965ESX-ADJ/NOPB has restricted voltage specifications: maximum input voltage of 7V and output voltage range of 1.216V to 5.1V. This substitute is only applicable to applications operating within these voltage constraints. The original MIC29372BU TR supports input voltages up to 26V and output voltages up to 26V. Verify your application voltage requirements before selecting this substitute.

Q4: What is the significance of the dropout voltage difference between these parts?

A: Dropout voltage determines the minimum voltage difference required between input and output for proper regulation. The MIC29372BU TR and MIC29372WU TR require 0.75V dropout at 750mA. The LM2941CSX/NOPB requires 1V dropout at 1A, while the LP3965ESX-ADJ/NOPB requires only 0.55V dropout at 1.5A. Lower dropout voltage allows operation with lower input voltages or provides better efficiency in battery-powered applications. Higher dropout voltage may require higher input voltage headroom in your circuit design.

Q5: Are all substitute parts RoHS compliant?

A: MIC29372WU TR, LM2941CSX/NOPB, and LP3965ESX-ADJ/NOPB are all ROHS3 compliant. The original MIC29372BU TR is RoHS non-compliant. For new designs or applications with RoHS compliance requirements, any of the three substitute parts are acceptable.

Q6: What is the quiescent current significance in these regulators?

A: Quiescent current is the current consumed by the regulator itself when no load is present. The MIC29372BU TR and MIC29372WU TR have low quiescent current of 300µA, making them suitable for battery-powered or low-power standby applications. The LM2941CSX/NOPB and LP3965ESX-ADJ/NOPB have higher quiescent currents (10mA and 9mA respectively), which may impact battery life in ultra-low-power applications but is negligible in standard powered systems.

Q7: Can these parts be used interchangeably in the same PCB design?

A: All four parts use the same TO-263 package footprint and are pin-compatible. However, electrical parameter differences require circuit design verification. Confirm that your application voltage requirements, current demands, and operating temperature range are compatible with the selected substitute before implementation.

Q8: What protection features does each part provide?

A: MIC29372BU TR and MIC29372WU TR provide over current and over temperature protection. LM2941CSX/NOPB adds reverse polarity protection. LP3965ESX-ADJ/NOPB provides over current, over temperature, and short circuit protection. Enhanced protection features in the Texas Instruments parts provide additional circuit safeguards in demanding applications.

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