MIC29301-3.3BU TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC29301-3.3BU TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 3.3V output at 3A in a TO-263-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MIC29301-3.3BU TR provides positive fixed output regulation with integrated protection features including over-current, over-temperature, reverse polarity, and transient voltage protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	3A
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.6V @ 3A
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-263-5 (D2PAK, 5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the MIC29301-3.3BU TR are qualified based on the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 3A
TO-263-5 package compatibility (D2PAK with 5 leads and tab)
Surface mount mounting type
Operating temperature range of -40°C ~ 125°C
Enable control feature
Protection against over-current and over-temperature conditions

Parts meeting these electrical and mechanical specifications are considered functionally equivalent and suitable for direct substitution in circuit designs originally specified for the MIC29301-3.3BU TR.

Parameter Comparison

Parameter	MIC29301-3.3BU TR	MIC29301-3.3WU-TR	LP3853ES-3.3/NOPB	LP3853ESX-3.3/NOPB
Manufacturer	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	3A	3A	3A	3A
Input Voltage (Max)	26V	26V	7V	7V
Voltage Dropout (Max)	0.6V @ 3A	0.6V @ 3A	0.6V @ 3A	0.6V @ 3A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	TO-263-5	TO-263-5	TO-263-5 (DDPAK-5)	TO-263-5 (DDPAK-5)
Product Status	Obsolete	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Control Features	Enable	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit

Engineering Selection Recommendations

MIC29301-3.3WU-TR is the direct parametric equivalent from Microchip Technology, maintaining identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is the preferred choice for designs requiring continuity with the original MIC29301 series.

LP3853ES-3.3/NOPB and LP3853ESX-3.3/NOPB from Texas Instruments are manufacturer-recommended alternatives that meet all critical electrical and mechanical requirements. Both parts are active products with ROHS3 compliance. The primary design consideration is the reduced maximum input voltage specification of 7V compared to the 26V rating of the MIC29301 series, which may affect suitability depending on the input voltage range of the target application.

Frequently Asked Questions (FAQ)

Q: Can MIC29301-3.3WU-TR be used as a direct replacement for MIC29301-3.3BU TR?

A: Yes. MIC29301-3.3WU-TR is a parametric equivalent with identical output voltage, output current, voltage dropout, operating temperature range, and package type. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and active product status with ROHS3 compliance.

Q: What is the key difference between the Microchip and Texas Instruments alternatives?

A: The LP3853ES-3.3/NOPB and LP3853ESX-3.3/NOPB from Texas Instruments have a maximum input voltage specification of 7V, compared to 26V for the MIC29301 series. Both meet the 3.3V output, 3A current, and TO-263-5 package requirements. Input voltage range compatibility must be verified for the target application.

Q: Are the TO-263-5 and DDPAK-5 packages mechanically compatible?

A: Yes. TO-263-5 and DDPAK-5 (D2PAK with 5 leads and tab) are mechanically and electrically compatible package designations for surface mount applications with identical pinout and thermal characteristics.

Q: Do all substitute parts have the same protection features?

A: The MIC29301-3.3WU-TR maintains identical protection features (over-current, over-temperature, reverse polarity, and transient voltage). The LP3853 series provides over-current, over-temperature, and short-circuit protection. Application-specific protection requirements should be evaluated.

Q: What is the RoHS compliance status of available substitutes?

A: MIC29301-3.3WU-TR, LP3853ES-3.3/NOPB, and LP3853ESX-3.3/NOPB are all ROHS3 compliant. The original MIC29301-3.3BU TR is RoHS non-compliant.

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