MIC39100-2.5BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC39100-2.5BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 2.5V 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 regulated power management with integrated protection features including over-current, over-temperature, and reverse polarity protection across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1A
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.63V @ 1A
Output Configuration	Positive Fixed
Package Type	SOT-223-3
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the MIC39100-2.5BS TR are qualified based on the following electrical and mechanical parameters:

Fixed output voltage of 2.5V
Output current rating of 1A
Maximum input voltage of 16V
SOT-223-3 package compatibility
Operating temperature range of -40°C to 125°C
Positive fixed output configuration
Integrated protection features (minimum: Over Current, Over Temperature, Reverse Polarity)

Two substitute parts meet these criteria: the MIC39100-2.5WS-TR (parametric equivalent from the same manufacturer) and the SPX3940M3-L-2-5/TR (manufacturer-recommended alternative from MaxLinear, Inc.).

Parameter Comparison

Parameter	MIC39100-2.5BS TR	MIC39100-2.5WS-TR	SPX3940M3-L-2-5/TR
Manufacturer	Microchip Technology	Microchip Technology	MaxLinear, Inc.
Output Voltage	2.5V	2.5V	2.5V
Output Current	1A	1A	1A
Input Voltage (Max)	16V	16V	16V
Voltage Dropout (Max)	0.63V @ 1A	0.63V @ 1A	0.55V @ 1A
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
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

MIC39100-2.5WS-TR is the direct parametric equivalent from Microchip Technology. This part maintains identical electrical specifications and package compatibility with the obsolete MIC39100-2.5BS TR. The primary advantage is active product status with RoHS3 compliance, addressing regulatory requirements for new designs. This option is suitable for direct replacement in existing applications requiring Microchip sourcing continuity.

SPX3940M3-L-2-5/TR from MaxLinear, Inc. provides an alternative from a different manufacturer while maintaining all core electrical parameters. This part offers improved voltage dropout performance (0.55V versus 0.63V at 1A), expanded protection features including short circuit and transient voltage protection, and superior moisture sensitivity rating (MSL 1 versus MSL 3). RoHS compliance and active product status support modern supply chain requirements. This option is recommended for new designs or applications where enhanced protection and lower dropout voltage provide system-level benefits.

Frequently Asked Questions (FAQ)

Q: Can MIC39100-2.5WS-TR be used as a direct replacement for MIC39100-2.5BS TR?

A: Yes. Both parts are from Microchip Technology with identical output voltage (2.5V), output current (1A), input voltage rating (16V), voltage dropout (0.63V @ 1A), operating temperature range (-40°C to 125°C), and SOT-223-3 packaging. The primary difference is product status (active versus obsolete) and RoHS compliance level.

Q: What are the advantages of SPX3940M3-L-2-5/TR over the Microchip alternatives?

A: The SPX3940M3-L-2-5/TR provides lower voltage dropout (0.55V versus 0.63V at 1A), additional protection features (short circuit and transient voltage protection), and superior moisture sensitivity rating (MSL 1 unlimited versus MSL 3 at 168 hours). These characteristics may reduce thermal dissipation and improve system reliability in moisture-sensitive environments.

Q: Are all three parts pin-compatible?

A: All three parts use SOT-223-3 packaging with identical pin configuration, enabling direct PCB-level substitution without layout modifications.

Q: What compliance considerations apply to part selection?

A: The MIC39100-2.5BS TR is RoHS non-compliant. Both substitute parts (MIC39100-2.5WS-TR and SPX3940M3-L-2-5/TR) are RoHS compliant, meeting current regulatory requirements for new designs and procurement in regulated markets.

Q: How do moisture sensitivity levels affect component handling?

A: MIC39100-2.5BS TR and MIC39100-2.5WS-TR require controlled storage at MSL 3 (168-hour floor life after moisture exposure). SPX3940M3-L-2-5/TR with MSL 1 rating has unlimited floor life, reducing moisture-related reflow failures and simplifying inventory management.

Q: Can these parts be used interchangeably in existing production?

A: Yes, provided that the application does not depend on manufacturer-specific characteristics beyond the specified electrical parameters. Validation testing is not required based on parameter equivalence, though design teams should confirm compatibility with their specific circuit implementation and thermal environment.

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