MIC5239-1.8BS TR Equivalent & Substitute Parts

Part Overview

The MIC5239-1.8BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 1.8V output at 500mA in SOT-223-3 surface mount packaging. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The regulator provides integrated protection features including over-current, over-temperature, over-voltage, and reverse polarity protection, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Output Voltage (Fixed)	1.8V
Output Current	500mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.35V @ 500mA (Typ)
Quiescent Current	45 µA
Operating Temperature Range	-40°C ~ 125°C
Package Type	SOT-223-3
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Over Voltage, Reverse Polarity
Control Features	Enable
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MIC5239-1.8BS TR is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
SOT-223-3 package compatibility
Surface mount mounting type
Positive output configuration
Enable control feature availability
Protection against over-current, over-temperature, and over-voltage conditions

Secondary Compatibility Factors:

Input voltage rating (minimum 30V tolerance)
Output current capability (minimum 500mA for direct replacement)
Voltage dropout characteristics
Operating temperature range (-40°C ~ 125°C minimum)
RoHS and REACH compliance status

The MIC5239-1.8YS-TR qualifies as a direct equivalent substitute, maintaining identical electrical specifications and package configuration while offering active product status. The MCP1804T-1802I/DB functions as a manufacturer-recommended alternative with reduced output current capability (100mA versus 500mA), suitable only for applications with lower current requirements.

Parameter Comparison

Parameter	MIC5239-1.8BS TR	MIC5239-1.8YS-TR	MCP1804T-1802I/DB
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Output Voltage	1.8V	1.8V	1.8V
Output Current	500mA	500mA	100mA
Input Voltage (Max)	30V	30V	28V
Voltage Dropout (Max)	0.35V @ 500mA (Typ)	0.35V @ 500mA (Typ)	2.7V @ 100mA
Quiescent Current	45 µA	45 µA	105 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package	SOT-223-3	SOT-223-3	SOT-223-3
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

MIC5239-1.8YS-TR is the preferred direct substitute for the obsolete MIC5239-1.8BS TR. This part maintains identical electrical performance specifications and package configuration while offering active product status and ROHS3 compliance. The MIC5239-1.8YS-TR is suitable for all applications currently using the MIC5239-1.8BS TR without design modifications.

MCP1804T-1802I/DB is a manufacturer-recommended alternative for applications with reduced output current requirements not exceeding 100mA. This part offers superior moisture sensitivity characteristics (MSL 1 versus MSL 3) and ROHS3 compliance. However, the MCP1804T-1802I/DB exhibits significantly higher voltage dropout (2.7V @ 100mA versus 0.35V @ 500mA) and reduced maximum operating temperature (85°C versus 125°C), limiting its applicability to designs with lower thermal and current demands.

Frequently Asked Questions (FAQ)

Q: Can the MIC5239-1.8YS-TR be used as a direct replacement for the MIC5239-1.8BS TR?

A: Yes. The MIC5239-1.8YS-TR is electrically and mechanically identical to the MIC5239-1.8BS TR, with matching output voltage (1.8V), output current (500mA), voltage dropout (0.35V @ 500mA), quiescent current (45 µA), and operating temperature range (-40°C ~ 125°C). Both parts use SOT-223-3 packaging. No circuit modifications are required.

Q: What are the limitations of the MCP1804T-1802I/DB as a substitute?

A: The MCP1804T-1802I/DB is limited to 100mA output current, compared to 500mA for the MIC5239-1.8BS TR. Additionally, it exhibits 2.7V voltage dropout at 100mA (versus 0.35V @ 500mA for the MIC5239), a reduced maximum operating temperature of 85°C (versus 125°C), and a lower maximum input voltage of 28V (versus 30V). This part is suitable only for low-current applications.

Q: Are there package compatibility concerns between these parts?

A: All three parts use SOT-223-3 surface mount packaging with identical pinout configurations (TO-261-4, TO-261AA). No PCB layout modifications are necessary for substitution.

Q: What is the significance of RoHS compliance status?

A: The MIC5239-1.8BS TR is RoHS non-compliant, while both the MIC5239-1.8YS-TR and MCP1804T-1802I/DB are ROHS3 compliant. For new designs and applications subject to RoHS regulations, the MIC5239-1.8YS-TR is the appropriate selection.

Q: How do moisture sensitivity levels affect component handling?

A: The MIC5239-1.8BS TR and MIC5239-1.8YS-TR have MSL 3 ratings (168-hour floor life), requiring controlled storage and handling conditions. The MCP1804T-1802I/DB has MSL 1 (unlimited floor life), offering greater flexibility in storage and assembly processes without moisture bake-out requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message