MIC39100-1.8BS Equivalent & Substitute Parts

Part Overview

The MIC39100-1.8BS is a linear voltage regulator IC from Microchip Technology designed for positive fixed 1.8V output at 1A current capacity in a SOT-223-3 surface mount package. This device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The part provides 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
Manufacturer	Microchip Technology
Output Voltage (Fixed)	1.8V
Output Current	1A
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.63V @ 1A
Package Type	SOT-223-3
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity

Substitute Part Grouping Explanation

Substitution for the MIC39100-1.8BS is determined by strict equivalence across the following critical parameters:

Output voltage specification: 1.8V fixed
Output current rating: 1A
Input voltage maximum: 16V
Voltage dropout characteristic: 0.63V @ 1A
Package configuration: SOT-223-3
Protection feature set: Over-current, over-temperature, and reverse polarity protection
Operating temperature range: -40°C to 125°C

The MIC39100-1.8WS meets all these criteria and qualifies as a direct substitute. The primary distinction between these parts is product status and packaging format, not electrical or mechanical performance.

Parameter Comparison

Parameter	MIC39100-1.8BS	MIC39100-1.8WS
Manufacturer	Microchip Technology	Microchip Technology
Output Voltage (Fixed)	1.8V	1.8V
Output Current	1A	1A
Input Voltage (Max)	16V	16V
Voltage Dropout (Max)	0.63V @ 1A	0.63V @ 1A
Package Type	SOT-223-3	SOT-223-3
Mounting Type	Surface Mount	Surface Mount
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant
Packaging Format	Bulk	Tube

Engineering Selection Recommendations

The MIC39100-1.8WS is the direct substitute for the MIC39100-1.8BS. Selection of the MIC39100-1.8WS is supported by:

Identical electrical specifications across all critical parameters
Active product status ensuring continued availability and manufacturing support
ROHS3 compliance meeting current environmental and regulatory requirements
Equivalent protection feature implementation and thermal performance
Identical package footprint and pinout compatibility

The transition from MIC39100-1.8BS to MIC39100-1.8WS requires no circuit redesign or PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can MIC39100-1.8WS be used as a direct replacement for MIC39100-1.8BS in existing designs?

A: Yes. Both parts share identical electrical specifications, package configuration, and pinout. No circuit or layout changes are required.

Q: What is the difference between the -BS and -WS suffix designations?

A: The suffix indicates packaging format. The -BS variant uses bulk packaging, while the -WS variant uses tube packaging. Electrical performance is identical.

Q: Is the MIC39100-1.8WS RoHS compliant?

A: Yes, the MIC39100-1.8WS is ROHS3 compliant. The original MIC39100-1.8BS is RoHS non-compliant.

Q: Are there any thermal or performance differences between these parts?

A: No. Both parts maintain identical voltage dropout characteristics, current output rating, and operating temperature range.

Q: Why is the MIC39100-1.8BS listed as obsolete?

A: The MIC39100-1.8BS has been superseded by the MIC39100-1.8WS. Microchip Technology continues to support the product line through the active variant.

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