MIC39100-3.3BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC39100-3.3BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 3.3V output at 1A current capacity in SOT-223-3 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device provides over current, over temperature, and reverse polarity protection across an operating range of -40°C to 125°C with a maximum input voltage of 16V and dropout voltage of 0.63V at 1A.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	16V
Dropout Voltage @ 1A	0.63V
Output Configuration	Positive Fixed
Protection Features	Over Current, Over Temperature, Reverse Polarity
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-3
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the MIC39100-3.3BS TR is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 3.3V
Output current rating of 1A minimum
Maximum input voltage of 16V or greater
SOT-223-3 package compatibility
Surface mount technology
Operating temperature range of -40°C to 125°C minimum
Positive fixed output configuration

Substitute parts must maintain identical electrical specifications for output voltage and current capacity. Package and mounting type compatibility is mandatory for direct board-level replacement. Protection features may vary between manufacturers but must include minimum over current and over temperature protection.

Parameter Comparison

Parameter	MIC39100-3.3BS TR	MIC39100-3.3WS-TR	SPX3940AM3-L-3-3/TR
Manufacturer	Microchip Technology	Microchip Technology	MaxLinear, Inc.
Product Status	Obsolete	Active	Active
Output Voltage	3.3V	3.3V	3.3V
Output Current	1A	1A	1A
Input Voltage (Max)	16V	16V	16V
Dropout Voltage @ 1A	0.63V	0.63V	0.55V
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-3	SOT-223-3	SOT-223-3
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity, Short Circuit, Transient Voltage
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

For applications currently using the obsolete MIC39100-3.3BS TR, the MIC39100-3.3WS-TR from Microchip Technology provides direct functional equivalence with active product status and RoHS3 compliance. This part maintains identical electrical specifications and packaging, making it the primary replacement option for existing designs.

The SPX3940AM3-L-3-3/TR from MaxLinear, Inc. serves as an alternative substitute with active product status and RoHS compliance. This part offers improved dropout voltage performance (0.55V versus 0.63V at 1A) and enhanced protection features including short circuit and transient voltage protection. The SPX3940AM3-L-3-3/TR features superior moisture sensitivity rating (MSL 1 versus MSL 3), providing better long-term reliability in storage and handling.

Selection between these substitutes depends on design requirements for compliance certifications and environmental handling specifications. Both maintain full electrical and mechanical compatibility with the original MIC39100-3.3BS TR specification.

Frequently Asked Questions (FAQ)

Q: Can MIC39100-3.3WS-TR directly replace MIC39100-3.3BS TR on existing PCBs?

A: Yes. Both parts share identical output voltage (3.3V), output current (1A), input voltage rating (16V), dropout voltage (0.63V @ 1A), and SOT-223-3 packaging. No circuit modifications are required.

Q: What is the difference between MIC39100-3.3BS TR and SPX3940AM3-L-3-3/TR?

A: Both parts provide 3.3V at 1A output with SOT-223-3 packaging and -40°C to 125°C operating range. The SPX3940AM3-L-3-3/TR offers lower dropout voltage (0.55V versus 0.63V), additional protection features (short circuit and transient voltage), and superior moisture sensitivity rating (MSL 1 versus MSL 3).

Q: Why is the MIC39100-3.3BS TR listed as obsolete?

A: The MIC39100-3.3BS TR has been discontinued by Microchip Technology. The MIC39100-3.3WS-TR provides equivalent functionality with active product status and improved compliance certifications.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The MIC39100-3.3BS TR is RoHS non-compliant. Both MIC39100-3.3WS-TR (RoHS3 compliant) and SPX3940AM3-L-3-3/TR (RoHS compliant) meet current environmental standards.

Q: What packaging formats are available for these substitutes?

A: MIC39100-3.3WS-TR is available in Cut Tape (CT) and Digi-Reel packaging. SPX3940AM3-L-3-3/TR is supplied in Tape & Reel (TR) format. Both use SOT-223-3 surface mount packaging.

Q: How do moisture sensitivity levels affect component handling?

A: MIC39100-3.3BS TR and MIC39100-3.3WS-TR have MSL 3 rating (168-hour floor life after moisture exposure). SPX3940AM3-L-3-3/TR has MSL 1 rating (unlimited floor life), providing extended storage capability without baking requirements.

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