MIC5201-5.0BS TR Equivalent & Substitute Parts

Part Overview

The MIC5201-5.0BS TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 5V output at 150mA in a surface-mount SOT-223-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MIC5201-5.0BS TR provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and reverse-polarity protection, suitable for applications requiring low-current 5V regulation from input sources up to 26V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.4V @ 150mA
Quiescent Current (Iq)	400 µA
Package Type	SOT-223-3
Output Configuration	Positive Fixed
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity

Substitute Part Grouping Explanation

Substitution for the MIC5201-5.0BS TR is determined by the following critical parameters:

Fixed 5V output voltage
Output current capability (minimum 150mA required for direct substitution)
Input voltage range compatibility (up to 26V preferred)
SOT-223 package family (SOT-223-3 or SOT-223-4 acceptable)
Surface-mount technology
Operating temperature range (-40°C to 125°C preferred for full compatibility)
Protection features (over-current, over-temperature, reverse-polarity)

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (150mA Output) Parts with identical 150mA output current rating in SOT-223-3 packaging, maintaining full electrical and mechanical compatibility.

Category 2: Higher-Current Alternatives (300mA to 1A Output) Parts with increased output current capability in SOT-223-4 packaging. These provide enhanced current delivery while maintaining 5V fixed output and compatible input voltage ranges. SOT-223-4 is mechanically compatible with SOT-223-3 footprints in most applications.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Operating Temp	Product Status	RoHS Status
MIC5201-5.0BS TR	Microchip Technology	150mA	26V	0.4V @ 150mA	SOT-223-3	-40°C ~ 125°C	Obsolete	Non-compliant
MIC5201-5.0YS-TR	Microchip Technology	150mA	26V	0.4V @ 150mA	SOT-223-3	-40°C ~ 85°C	Active	ROHS3 Compliant
TC1108-5.0VDBTR	Microchip Technology	300mA	6V	0.48V @ 300mA	SOT-223-3	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2937IMP-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	SOT-223-4	-40°C ~ 85°C	Active	ROHS3 Compliant
LM2937IMPX-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	SOT-223-4	-40°C ~ 85°C	Active	ROHS3 Compliant
LM2940IMP-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	SOT-223-4	-40°C ~ 85°C	Active	ROHS3 Compliant
LM2940IMPX-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	SOT-223-4	-40°C ~ 85°C	Active	ROHS3 Compliant
LT1121CST-5#PBF	Analog Devices Inc.	150mA	30V	0.7V @ 150mA	SOT-223-3	0°C ~ 125°C	Active	ROHS3 Compliant
LT1121CST-5#TRPBF	Analog Devices Inc.	150mA	30V	0.7V @ 150mA	SOT-223-3	0°C ~ 125°C	Active	ROHS3 Compliant
LT1121IST-5#PBF	Analog Devices Inc.	150mA	30V	0.7V @ 150mA	SOT-223-3	-40°C ~ 125°C	Active	ROHS3 Compliant
LT1121IST-5#TRPBF	Analog Devices Inc.	150mA	30V	0.7V @ 150mA	SOT-223-3	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Current Rating):

MIC5201-5.0YS-TR is the primary direct equivalent from Microchip Technology. It maintains the same 150mA output current and SOT-223-3 package as the obsolete MIC5201-5.0BS TR. This part is active and ROHS3 compliant. The operating temperature range is reduced to -40°C ~ 85°C compared to the original -40°C ~ 125°C specification.

LT1121IST-5#TRPBF and LT1121IST-5#PBF from Analog Devices Inc. provide 150mA output in SOT-223-3 packaging with full -40°C ~ 125°C operating range. These parts feature higher input voltage tolerance (30V maximum) and are ROHS3 compliant and active. The quiescent current is lower at 50 µA compared to 400 µA in the original part.

LT1121CST-5#TRPBF and LT1121CST-5#PBF are functionally equivalent to the LT1121IST variants but with reduced operating temperature range (0°C ~ 125°C).

For Higher-Current Applications:

TC1108-5.0VDBTR from Microchip Technology delivers 300mA output in SOT-223-3 packaging. This part is active and ROHS3 compliant with full -40°C ~ 125°C operating range. Input voltage is limited to 6V maximum, restricting its use to lower-voltage input applications.

LM2937IMP-5.0/NOPB and LM2937IMPX-5.0/NOPB from Texas Instruments provide 500mA output in SOT-223-4 packaging. Both are active, ROHS3 compliant, and support 26V maximum input voltage. Operating temperature range is -40°C ~ 85°C.

LM2940IMP-5.0/NOPB and LM2940IMPX-5.0/NOPB from Texas Instruments deliver 1A output in SOT-223-4 packaging. Both are active, ROHS3 compliant, and support 26V maximum input voltage. Operating temperature range is -40°C ~ 85°C.

All substitute parts listed are active products with current manufacturing status and ROHS3 compliance, eliminating obsolescence risk.

Frequently Asked Questions (FAQ)

Q: Can I use a higher-current rated regulator as a direct substitute?

A: Yes, higher-current regulators can substitute for lower-current designs when the output voltage, input voltage range, and package compatibility are maintained. The LM2937 and LM2940 series provide increased current capacity while maintaining 5V fixed output and 26V input compatibility. However, SOT-223-4 packages have four pins compared to SOT-223-3 three-pin packages; verify PCB footprint compatibility before substitution.

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

A: SOT-223-3 contains three pins (input, ground, output), while SOT-223-4 adds a fourth pin for enhanced thermal performance. SOT-223-4 parts can typically be used on SOT-223-3 footprints with the fourth pin left unconnected, but this should be confirmed with the specific PCB layout and thermal requirements.

Q: Why does the MIC5201-5.0YS-TR have a reduced operating temperature range?

A: The MIC5201-5.0YS-TR is specified for -40°C ~ 85°C (TJ), compared to the original -40°C ~ 125°C. This reflects the active product's thermal specifications. For applications requiring full -40°C ~ 125°C operation, LT1121IST variants are recommended.

Q: What is the significance of the "X" designation in LM2937IMPX and LM2940IMPX?

A: The "X" suffix indicates extended temperature or enhanced specifications within the same base product line. Both LM2937IMP and LM2937IMPX, as well as LM2940IMP and LM2940IMPX, share identical electrical specifications and are functionally interchangeable.

Q: Are all listed substitutes RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MIC5201-5.0BS TR is marked as RoHS non-compliant. For applications requiring RoHS compliance, select from the active substitute parts.

Q: What is the quiescent current difference between MIC5201 and LT1121 variants?

A: The MIC5201-5.0BS TR has a quiescent current of 400 µA, while LT1121 variants specify 50 µA. Lower quiescent current reduces standby power consumption, making LT1121 parts advantageous for battery-powered or low-power applications.

Q: Can I substitute TC1108-5.0VDBTR for applications requiring 26V input?

A: No. The TC1108-5.0VDBTR is limited to 6V maximum input voltage, making it unsuitable for applications requiring 26V input compatibility. Use LM2937 or LM2940 series for 26V input support.

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