MIC5201-5.0BS Equivalent & Substitute Parts

Part Overview

The MIC5201-5.0BS is a linear voltage regulator IC from Microchip Technology designed to deliver positive fixed 5V output at 150mA in a compact SOT-223-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator features integrated over-current, over-temperature, and reverse polarity protection, with a maximum input voltage of 26V and dropout voltage of 0.4V at 150mA.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the MIC5201-5.0BS are categorized based on the following critical parameters:

Direct Equivalents (Same Output Current - 150mA): Parts that maintain the 150mA output current specification with identical or superior electrical characteristics. These include MIC5201-5.0YS (Microchip, active status), LT1121CST-5#PBF, LT1121CST-5#TRPBF, LT1121IST-5#PBF, and LT1121IST-5#TRPBF (Analog Devices). All operate at 5V fixed output with SOT-223-3 packaging.

Higher Current Alternatives (300mA - 1A Output): Parts that exceed the 150mA specification, suitable for applications requiring additional current headroom. These include TC1108-5.0VDBTR (300mA), LM2937IMP-5.0/NOPB and LM2937IMPX-5.0/NOPB (500mA), and LM2940IMP-5.0/NOPB and LM2940IMPX-5.0/NOPB (1A). Higher current parts are backward compatible for lower current applications.

Substitution Criteria:

Fixed 5V output voltage
SOT-223 package family (SOT-223-3 or SOT-223-4)
Surface mount technology
Positive output configuration
Operating temperature range compatibility
RoHS3 compliance for new designs

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Status	RoHS
MIC5201-5.0BS	Microchip	150mA	26V	0.4V @ 150mA	400 µA	SOT-223-3	Obsolete	Non-compliant
MIC5201-5.0YS	Microchip	150mA	26V	0.4V @ 150mA	400 µA	SOT-223-3	Active	ROHS3 Compliant
TC1108-5.0VDBTR	Microchip	300mA	6V	0.48V @ 300mA	90 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
LT1121CST-5#PBF	Analog Devices	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	Active	ROHS3 Compliant
LT1121CST-5#TRPBF	Analog Devices	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	Active	ROHS3 Compliant
LT1121IST-5#PBF	Analog Devices	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	Active	ROHS3 Compliant
LT1121IST-5#TRPBF	Analog Devices	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Current Rating): MIC5201-5.0YS is the primary recommendation as an active Microchip part with identical electrical specifications and RoHS3 compliance. The LT1121 series (CST and IST variants) from Analog Devices provides equivalent 150mA output with superior input voltage tolerance (30V vs 26V) and lower quiescent current (50 µA vs 400 µA), making them suitable for power-sensitive applications.

For Upgraded Current Capacity: TC1108-5.0VDBTR offers 300mA output while maintaining SOT-223-3 packaging, though input voltage is limited to 6V. LM2937 and LM2940 series from Texas Instruments provide 500mA and 1A respectively with 26V input tolerance, requiring SOT-223-4 package accommodation. These are appropriate when circuit board layout permits the larger package footprint.

Compliance Considerations: All recommended active substitutes carry RoHS3 compliance certification, suitable for new product designs. The original MIC5201-5.0BS is RoHS non-compliant and obsolete; migration to an active part is necessary for ongoing production.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current rated regulator as a direct substitute? A: Yes. Higher current regulators (300mA, 500mA, 1A) are backward compatible with 150mA applications. The regulator will deliver the required 150mA without stress. Verify PCB layout accommodates the package type (SOT-223-4 for LM2937/LM2940 series).

Q: What is the difference between SOT-223-3 and SOT-223-4 packages? A: SOT-223-3 contains three pins (input, output, ground). SOT-223-4 adds a fourth pin for enhanced thermal performance and is used in higher current regulators. PCB footprints differ; verify design compatibility before substitution.

Q: Are LT1121 variants (CST vs IST) interchangeable? A: Yes. CST and IST designations indicate different temperature grades. CST operates 0°C to 125°C; IST operates -40°C to 125°C. Both are electrically identical and pin-compatible. Select based on application temperature requirements.

Q: What does the packaging suffix mean (PBF vs TRPBF)? A: PBF indicates tube packaging; TRPBF indicates tape and reel packaging. Both contain identical components; packaging choice depends on assembly process requirements and order quantities.

Q: Why does MIC5201-5.0YS have lower quiescent current than the original MIC5201-5.0BS? A: The YS variant represents a design improvement in the same product line. Lower quiescent current (400 µA to 400 µA specification maintained) reduces standby power consumption, beneficial for battery-powered applications.

Q: Can I substitute LM2937 or LM2940 if my circuit only needs 150mA? A: Yes. These regulators are rated for higher currents but operate safely at lower loads. Verify input voltage compatibility (26V maximum for both) and confirm PCB layout accommodates SOT-223-4 package before design implementation.

Q: What is the input voltage limit for TC1108-5.0VDBTR? A: TC1108-5.0VDBTR has a 6V maximum input voltage, significantly lower than the original MIC5201-5.0BS (26V). This part is suitable only for applications with input voltages below 6V. For higher input voltages, use MIC5201-5.0YS or LT1121 series.

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