MIC5239-5.0BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC5239-5.0BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 5V output at 500mA in SOT-223-3 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 5V output with integrated protection features including over-current, over-temperature, over-voltage, and reverse polarity protection, suitable for applications requiring stable low-current power supply regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
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
Protection Features	Over Current, Over Temperature, Over Voltage, Reverse Polarity
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the MIC5239-5.0BS TR are grouped based on the following critical parameters that determine functional equivalence:

Output voltage fixed at 5V
Output current capability of 500mA or greater
Maximum input voltage of 26V or higher
Surface mount SOT-223 package family
Operating temperature range of -40°C to 85°C or wider
Positive output configuration with fixed output type

The MIC5239-5.0YS-TR represents a direct equivalent from the same manufacturer with identical electrical specifications but improved product status (Active vs. Obsolete) and RoHS3 compliance. The Texas Instruments LM2937 and LM2940 series provide functional substitutes with comparable or superior output current ratings. The MaxLinear SPX2954 series offers alternatives with lower output current (250mA) but maintains the 5V fixed output and SOT-223 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
MIC5239-5.0BS TR	Microchip Technology	500mA	30V	0.35V @ 500mA	45 µA	SOT-223-3	Obsolete	RoHS non-compliant
MIC5239-5.0YS-TR	Microchip Technology	500mA	30V	0.35V @ 500mA	45 µA	SOT-223-3	Active	ROHS3 Compliant
LM2937IMP-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	10 mA	SOT-223-4	Active	ROHS3 Compliant
LM2937IMPX-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	10 mA	SOT-223-4	Active	ROHS3 Compliant
LM2940IMP-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	10 mA	SOT-223-4	Active	ROHS3 Compliant
LM2940IMPX-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	10 mA	SOT-223-4	Active	ROHS3 Compliant
SPX2954M3-L-5-0/TR	MaxLinear, Inc.	250mA	30V	0.5V @ 250mA	170 µA	SOT-223-3	Active	RoHS Compliant
SPX2954AM3-L-5-0/TR	MaxLinear, Inc.	250mA	30V	0.5V @ 250mA	170 µA	SOT-223-3	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Recommendation: MIC5239-5.0YS-TR

The MIC5239-5.0YS-TR is the direct functional equivalent with identical electrical specifications. This part maintains the same 500mA output current, 30V maximum input voltage, and superior 0.35V dropout voltage. The primary advantages are Active product status and ROHS3 compliance, eliminating obsolescence risk and meeting modern regulatory requirements.

Secondary Recommendation: LM2937IMP-5.0/NOPB or LM2937IMPX-5.0/NOPB

These Texas Instruments parts provide 500mA output current with Active status and ROHS3 compliance. The trade-off is a reduced maximum input voltage (26V vs. 30V) and higher dropout voltage (1V vs. 0.35V). These parts are suitable for applications where the lower input voltage rating is acceptable and higher quiescent current (10mA vs. 45µA) does not impact system performance.

Tertiary Recommendation: LM2940IMP-5.0/NOPB or LM2940IMPX-5.0/NOPB

These parts offer superior 1A output current capability with Active status and ROHS3 compliance. Selection is appropriate for applications requiring higher current capacity than the original 500mA specification. The same input voltage and dropout voltage trade-offs apply as the LM2937 series.

Alternative for Current-Limited Applications: SPX2954M3-L-5-0/TR or SPX2954AM3-L-5-0/TR

The MaxLinear SPX2954 series provides 250mA output current with Active status and RoHS compliance. These parts maintain the 30V maximum input voltage and offer comparable dropout voltage (0.5V). Selection is appropriate only for applications where 250mA output current is sufficient, as this represents a reduction from the original 500mA specification.

Frequently Asked Questions (FAQ)

Q: Can I use MIC5239-5.0YS-TR as a direct replacement for MIC5239-5.0BS TR?

A: Yes. The MIC5239-5.0YS-TR is electrically identical with the same 500mA output current, 5V fixed output, 30V maximum input voltage, and 0.35V dropout voltage. The primary differences are packaging format (Cut Tape & Digi-Reel vs. Tape & Reel), Active product status, and ROHS3 compliance. No circuit modifications are required.

Q: What are the key differences between the MIC5239 and LM2937 series?

A: The LM2937 series reduces maximum input voltage from 30V to 26V and increases dropout voltage from 0.35V to 1V at 500mA. Quiescent current increases from 45µA to 10mA. Both maintain 500mA output current and 5V fixed output. The LM2937 series is suitable if your application operates within the 26V input limit and can tolerate higher dropout voltage.

Q: Can I use LM2940 parts instead of the original MIC5239?

A: Yes, with consideration for higher current capability. The LM2940 series provides 1A output current versus the original 500mA, making it suitable for applications requiring higher current. The same input voltage and dropout voltage trade-offs apply as the LM2937 series. No circuit modifications are required if your application can accommodate the higher current rating.

Q: Why would I choose SPX2954 parts if they provide only 250mA output?

A: The SPX2954 series is appropriate only for applications where 250mA output current is sufficient. These parts maintain the 30V maximum input voltage and offer comparable dropout voltage to the original part. Selection should be based on confirmed current requirements not exceeding 250mA.

Q: Are all substitute parts RoHS compliant?

A: The MIC5239-5.0YS-TR is ROHS3 compliant. The LM2937 and LM2940 series are ROHS3 compliant. The SPX2954 series is RoHS compliant. The original MIC5239-5.0BS TR is RoHS non-compliant. Modern designs should prioritize ROHS3 or RoHS compliant alternatives.

Q: What is the difference between SOT-223-3 and SOT-223-4 packaging?

A: SOT-223-3 contains three pins (input, output, ground), while SOT-223-4 contains four pins (input, output, ground, and an additional pin). Both are surface mount packages with similar physical dimensions. The LM2937 and LM2940 series use SOT-223-4 packaging. PCB layout modifications may be required if switching from SOT-223-3 to SOT-223-4, as the pin configuration differs.

Q: Can I use these parts interchangeably in my existing design?

A: Direct pin-for-pin substitution is possible only with MIC5239-5.0YS-TR (SOT-223-3 package). Substitution with LM2937 or LM2940 series requires PCB layout modification due to SOT-223-4 packaging. Substitution with SPX2954 series is possible with SOT-223-3 packaging but requires verification that 250mA output current is sufficient for your application.

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