MIC29300-3.3BU TR Equivalent & Substitute Parts

Part Overview

The MIC29300-3.3BU TR is a linear voltage regulator IC from Microchip Technology, delivering a fixed 3.3V output at 3A in a TO-263-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides positive fixed output regulation with integrated protection features including over-current, over-temperature, reverse polarity, and transient voltage protection across an operating temperature range of -40°C to 125°C.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the MIC29300-3.3BU TR is determined by the following critical parameters: fixed 3.3V output voltage, TO-263-3 package compatibility, surface mount mounting type, and operating temperature range of -40°C to 125°C. Substitute parts must maintain these core electrical and mechanical specifications to ensure direct replacement capability.

The substitute parts are grouped into two categories:

Direct Microchip Equivalent: MIC29300-3.3WU-TR maintains identical electrical specifications and package type but differs in product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. Tape & Reel).

Cross-Manufacturer Substitutes: LM2937ES-3.3/NOPB, LM2937ESX-3.3/NOPB (Texas Instruments), and SPX29300T-L-3-3/TR (MaxLinear) provide functional equivalence with the same output voltage and package type. However, these parts exhibit variations in output current rating and maximum input voltage that must be evaluated for specific application requirements.

Parameter Comparison

Parameter	MIC29300-3.3BU TR	MIC29300-3.3WU-TR	LM2937ES-3.3/NOPB	LM2937ESX-3.3/NOPB	SPX29300T-L-3-3/TR
Manufacturer	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments	MaxLinear, Inc.
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	3A	3A	500mA	500mA	3A
Input Voltage (Max)	26V	26V	26V	26V	16V
Dropout Voltage (Max)	0.6V @ 3A	0.6V @ 3A	1V @ 500mA	1V @ 500mA	0.8V @ 3A
Package Type	TO-263-3	TO-263-3	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)	TO-263-3
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

MIC29300-3.3WU-TR is the primary direct substitute for the obsolete MIC29300-3.3BU TR. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel), which does not affect electrical performance or PCB compatibility.

SPX29300T-L-3-3/TR (MaxLinear) provides a functionally equivalent alternative with matching 3A output current and TO-263-3 package. This part is suitable for applications where the 16V maximum input voltage specification is sufficient. The slightly higher dropout voltage (0.8V vs. 0.6V @ 3A) must be evaluated against thermal and efficiency requirements.

LM2937ES-3.3/NOPB and LM2937ESX-3.3/NOPB (Texas Instruments) are suitable only for applications requiring output currents of 500mA or less. These parts are not recommended as direct replacements for designs requiring the full 3A output capability of the original MIC29300-3.3BU TR. Both Texas Instruments variants are active products with ROHS3 compliance.

For new designs and production requiring the obsolete MIC29300-3.3BU TR, MIC29300-3.3WU-TR is the recommended primary choice due to identical specifications and active status.

Frequently Asked Questions (FAQ)

Q: Can LM2937ES-3.3/NOPB directly replace MIC29300-3.3BU TR?

A: No. While both parts share the same 3.3V output voltage and TO-263-3 package, the LM2937ES-3.3/NOPB is rated for only 500mA output current compared to the 3A rating of the MIC29300-3.3BU TR. This part is suitable only for applications with lower current requirements.

Q: What is the difference between MIC29300-3.3BU TR and MIC29300-3.3WU-TR?

A: Both parts are electrically identical with the same 3.3V output, 3A current rating, and TO-263-3 package. The primary differences are product status (obsolete vs. active), packaging format (Tape & Reel vs. Cut Tape & Digi-Reel), and RoHS compliance status. MIC29300-3.3WU-TR is the recommended substitute.

Q: Is SPX29300T-L-3-3/TR compatible with the original MIC29300-3.3BU TR?

A: SPX29300T-L-3-3/TR is mechanically and functionally compatible for applications where the 16V maximum input voltage is acceptable. The original part supports 26V input. The dropout voltage is also slightly higher (0.8V vs. 0.6V @ 3A). Verify input voltage requirements before selection.

Q: Are all substitute parts RoHS compliant?

A: MIC29300-3.3WU-TR, LM2937ES-3.3/NOPB, LM2937ESX-3.3/NOPB, and SPX29300T-L-3-3/TR are all RoHS compliant. The original MIC29300-3.3BU TR is RoHS non-compliant.

Q: Can I use these parts interchangeably on the same PCB?

A: MIC29300-3.3WU-TR is a direct pin-compatible replacement. SPX29300T-L-3-3/TR is also pin-compatible in the TO-263-3 package. LM2937 variants use the same TO-263 (DDPAK-3) package with identical pinout. Verify input voltage and current requirements for your specific application before substitution.

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