MIC5239-3.0BS TR Equivalent & Substitute Parts

Part Overview

The MIC5239-3.0BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 3V output applications with 500mA current capacity in SOT-223-3 surface mount packaging. This part is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The device provides integrated protection features including over-current, over-temperature, over-voltage, and reverse polarity protection, with an enable control feature for flexible power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	500mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.35V @ 500mA (Typ)
Quiescent Current	45 µA
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-223-3
Protection Features	Over Current, Over Temperature, Over Voltage, Reverse Polarity
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the MIC5239-3.0BS TR are identified based on the following critical parameters that determine functional compatibility:

Fixed output voltage of 3V
Surface mount SOT-223-3 package compatibility
Positive output configuration
Single regulator output
Integrated protection features (minimum: Over Current, Over Temperature)
Operating temperature range support

The substitution logic prioritizes parts that maintain the same output voltage specification and package form factor while meeting or exceeding the protection and control feature requirements. Current output capacity and dropout voltage characteristics are secondary considerations that may vary within acceptable design margins depending on application requirements.

Parameter Comparison

Parameter	MIC5239-3.0BS TR	MIC5239-3.0YS-TR	MCP1804T-3002I/DB
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Output Voltage (Fixed)	3V	3V	3V
Output Current	500mA	500mA	150mA
Input Voltage (Max)	30V	30V	28V
Dropout Voltage (Max)	0.35V @ 500mA (Typ)	0.35V @ 500mA (Typ)	1.7V @ 100mA
Quiescent Current	45 µA	45 µA	105 µA
Package	SOT-223-3	SOT-223-3	SOT-223-3
Protection Features	Over Current, Over Temperature, Over Voltage, Reverse Polarity	Over Current, Over Temperature, Over Voltage, Reverse Polarity	Over Current, Over Temperature
Control Features	Enable	Enable	None
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C

Engineering Selection Recommendations

MIC5239-3.0YS-TR is the primary direct substitute for MIC5239-3.0BS TR. Both parts share identical electrical specifications, package configuration, and protection feature sets. The MIC5239-3.0YS-TR maintains active product status with ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original part. This substitute provides equivalent performance with improved supply chain availability (20,027 units in stock versus 1,109 units).

MCP1804T-3002I/DB is a manufacturer-recommended alternative when output current requirements do not exceed 150mA. This part maintains the 3V fixed output voltage and SOT-223-3 package compatibility but operates with reduced current capacity and higher dropout voltage. The MCP1804T-3002I/DB offers active product status and ROHS3 compliance. Selection of this part requires confirmation that the application load current does not exceed 150mA and that the 1.7V maximum dropout voltage is acceptable for the input voltage range specified in the design.

Frequently Asked Questions (FAQ)

Q: Can MIC5239-3.0YS-TR be used as a direct replacement for MIC5239-3.0BS TR?

A: Yes. Both parts are electrically and mechanically identical with matching output voltage (3V), output current (500mA), dropout voltage (0.35V @ 500mA), quiescent current (45 µA), operating temperature range (-40°C ~ 125°C), and protection features. The primary difference is product status and RoHS compliance, with MIC5239-3.0YS-TR being the active, compliant version.

Q: What are the limitations of MCP1804T-3002I/DB as a substitute?

A: The MCP1804T-3002I/DB reduces output current capacity to 150mA (compared to 500mA) and increases dropout voltage to 1.7V @ 100mA (compared to 0.35V @ 500mA). Additionally, it lacks enable control features and over-voltage/reverse polarity protection. This part is suitable only for applications with maximum load current of 150mA and where the higher dropout voltage does not compromise system performance.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the SOT-223-3 surface mount package, ensuring mechanical and PCB layout compatibility with the original MIC5239-3.0BS TR design.

Q: What is the impact of the MIC5239-3.0BS TR obsolescence status?

A: The obsolete status indicates the part is no longer manufactured or supported by Microchip Technology. Existing inventory may become unavailable, and technical support may be limited. Migration to MIC5239-3.0YS-TR is recommended to ensure long-term supply chain continuity and access to current product support.

Q: Does RoHS compliance affect functional performance?

A: RoHS compliance reflects manufacturing process changes and material composition but does not alter electrical performance or functional characteristics. ROHS3-compliant substitutes (MIC5239-3.0YS-TR and MCP1804T-3002I/DB) meet current regulatory requirements for electronic component procurement in regulated markets.

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