MIC39301-2.5BU TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC39301-2.5BU TR is a linear voltage regulator IC from Microchip Technology, delivering a fixed 2.5V output at 3A in a TO-263-5 surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The regulator features enable control, over-current protection, over-temperature protection, and reverse polarity protection, with a maximum input voltage of 16V and dropout voltage of 0.55V at 3A.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	3A
Input Voltage (Max)	16V
Dropout Voltage @ 3A	0.55V
Output Configuration	Positive Fixed
Package / Case	TO-263-5 (D2PAK, 5 Leads + Tab)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Control Features	Enable
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the MIC39301-2.5BU TR is determined by the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 3A (or higher)
TO-263-5 package compatibility
Surface mount technology
Operating temperature range of -40°C to 125°C
Enable control feature
Protection against over-current, over-temperature, and reverse polarity conditions

Substitute parts are grouped into two categories based on output current rating:

Full-Current Equivalents (3A Output): Parts maintaining the 3A output current specification, ensuring direct functional replacement without derating.

Reduced-Current Alternatives (1.5A Output): Parts with lower output current ratings, suitable only for applications requiring 1.5A or less, not for direct replacement in 3A-demand circuits.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Package	Product Status	RoHS Compliance
MIC39301-2.5BU TR	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	TO-263-5	Obsolete	Non-compliant
MIC39301-2.5WU-TR	Microchip Technology	2.5V	3A	16V	0.55V @ 3A	TO-263-5	Active	ROHS3 Compliant
LT1764AEQ-2.5#PBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	TO-263-5	Active	ROHS3 Compliant
LT1764AEQ-2.5#TRPBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	TO-263-5	Active	ROHS3 Compliant
LT1764EQ-2.5#PBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	TO-263-5	Active	ROHS3 Compliant
LT1764EQ-2.5#TRPBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	TO-263-5	Active	ROHS3 Compliant
LP3853ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	0.6V @ 3A	TO-263-5	Active	ROHS3 Compliant
LP3853ESX-2.5/NOPB	National Semiconductor	2.5V	3A	7V	0.6V @ 3A	TO-263-5	Active	Not specified
LP3965ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263-5	Active	ROHS3 Compliant
LP3965ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263-5	Active	ROHS3 Compliant
LT1963AEQ-2.5#PBF	Analog Devices Inc.	2.5V	1.5A	20V	0.55V @ 1.5A	TO-263-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Full 3A Equivalents):

MIC39301-2.5WU-TR is the direct replacement from Microchip Technology, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. This part is recommended for seamless design continuity.

LT1764AEQ-2.5#TRPBF and LT1764EQ-2.5#TRPBF from Analog Devices Inc. provide 3A output capability with higher input voltage tolerance (20V vs. 16V) and improved quiescent current performance (1.5 mA). These parts are suitable for applications requiring extended input voltage range and are available in tape & reel packaging for production volumes.

LP3853ES-2.5/NOPB and LP3853ESX-2.5/NOPB from Texas Instruments and National Semiconductor deliver 3A output with lower maximum input voltage (7V). These parts include PSRR specification (73dB to 57dB at 120Hz) and are appropriate for lower input voltage applications.

Secondary Substitutes (Reduced 1.5A Output):

LP3965ES-2.5/NOPB, LP3965ESX-2.5/NOPB, and LT1963AEQ-2.5#PBF are suitable only for applications requiring 1.5A or less. These parts are not direct replacements for 3A-demand circuits and require circuit redesign or current derating analysis.

All recommended substitutes maintain the TO-263-5 package, surface mount technology, -40°C to 125°C operating temperature range, and required protection features. Selection should prioritize active product status and ROHS3 compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can LP3965ES-2.5/NOPB replace MIC39301-2.5BU TR in a 3A application?

A: No. LP3965ES-2.5/NOPB is rated for 1.5A maximum output current, while MIC39301-2.5BU TR is rated for 3A. Using this part in a 3A application will exceed its current rating and trigger over-current protection or device failure. This part is suitable only for applications requiring 1.5A or less.

Q: What is the difference between LT1764AEQ-2.5#PBF and LT1764AEQ-2.5#TRPBF?

A: Both parts are electrically identical with 3A output, 2.5V fixed output, and 20V maximum input voltage. The primary difference is packaging: #PBF indicates tube packaging, while #TRPBF indicates tape & reel packaging. Tape & reel is standard for production volumes and automated assembly.

Q: Is MIC39301-2.5WU-TR a direct replacement for MIC39301-2.5BU TR?

A: Yes. MIC39301-2.5WU-TR maintains identical electrical specifications (2.5V output, 3A current, 16V input, 0.55V dropout) and TO-263-5 package. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant). This is the recommended direct replacement.

Q: Why do some substitutes have lower maximum input voltage (7V vs. 16V)?

A: LP3853 and LP3965 series regulators from Texas Instruments are designed for lower input voltage applications. While they maintain 2.5V output and 3A capability, their 7V maximum input rating restricts use to lower voltage supply rails. Verify your application's input voltage requirement before selection.

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

A: Yes. All listed substitutes use TO-263-5 (D2PAK with 5 leads plus tab) surface mount package, ensuring PCB layout compatibility. However, packaging format varies: tube, tape & reel, and bulk. Confirm packaging availability with your supplier for production requirements.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For new designs and regulated applications, ROHS3-compliant parts are required. MIC39301-2.5BU TR is non-compliant; all active substitutes listed are ROHS3 compliant.

Q: Can I use LT1764 series parts in place of Microchip MIC39301 parts?

A: Yes, for 3A applications. LT1764 series parts (LT1764AEQ-2.5#PBF, LT1764AEQ-2.5#TRPBF, LT1764EQ-2.5#PBF, LT1764EQ-2.5#TRPBF) provide 3A output, 2.5V fixed voltage, and TO-263-5 package compatibility. The higher input voltage rating (20V vs. 16V) and lower quiescent current (1.5 mA) may provide performance advantages in some applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message