MIC2954-03BS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC2954-03BS is a linear voltage regulator IC from Microchip Technology, delivering a fixed 5V output at 250mA in a SOT-223-3 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MIC2954-03BS features comprehensive protection including load dump, over current, over temperature, reverse polarity, and UV power-on reset functionality across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	MIC2954-03BS
Product Status	Obsolete
Output Voltage	5V Fixed
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage	0.6V @ 250mA
Quiescent Current	300 µA
Package	SOT-223-3
Operating Temperature	-40°C to 125°C
Protection Features	Load Dump, Over Current, Over Temperature, Reverse Polarity, UV POR
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution for the MIC2954-03BS is determined by the following critical parameters:

Output voltage: 5V fixed
Output current capability: minimum 250mA
Package type: SOT-223-3 surface mount
Input voltage tolerance: up to 30V maximum
Dropout voltage performance at rated current
Operating temperature range: -40°C to 125°C
Protection feature set

Substitute parts are grouped into three categories based on compatibility level:

Direct Microchip Equivalents maintain identical electrical specifications and protection features, differing only in packaging format or product status.

Manufacturer Recommended Alternatives from Microchip provide active product status with equivalent or superior performance characteristics, though some may have reduced input voltage ratings or modified protection features.

Cross-Manufacturer Alternatives from Analog Devices offer functional equivalence with comparable output current, voltage ratings, and package compatibility, though protection feature sets may differ.

Parameter Comparison

Part Number	Manufacturer	Status	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Quiescent Current	Package	RoHS
MIC2954-03BS	Microchip	Obsolete	250mA	30V	0.6V @ 250mA	300 µA	SOT-223-3	Non-compliant
MIC2954-03WS	Microchip	Active	250mA	30V	0.6V @ 250mA	300 µA	SOT-223-3	ROHS3 Compliant
MIC2954-02WS	Microchip	Active	250mA	30V	0.6V @ 250mA	300 µA	SOT-223-3	ROHS3 Compliant
MCP1703-5002E/DB	Microchip	Active	250mA	16V	0.65V @ 250mA	5 µA	SOT-223-3	ROHS3 Compliant
TC1108-5.0VDBTR	Microchip	Active	300mA	6V	0.48V @ 300mA	90 µA	SOT-223-3	ROHS3 Compliant
LT1121CST-5#PBF	Analog Devices	Active	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	ROHS3 Compliant
LT1121CST-5#TRPBF	Analog Devices	Active	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	ROHS3 Compliant
LT1121IST-5#PBF	Analog Devices	Active	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	ROHS3 Compliant
LT1121IST-5#TRPBF	Analog Devices	Active	150mA	30V	0.7V @ 150mA	50 µA	SOT-223-3	ROHS3 Compliant
LT1521CST-5#PBF	Analog Devices	Active	300mA	20V	0.75V @ 300mA	25 µA	SOT-223-3	ROHS3 Compliant
LT1521CST-5#TRPBF	Analog Devices	Active	300mA	20V	0.75V @ 300mA	25 µA	SOT-223-3	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Product Status: MIC2954-03WS and MIC2954-02WS are the primary substitutes, offering identical electrical performance to the obsolete MIC2954-03BS while maintaining active product status and ROHS3 compliance. Both parts preserve the full 30V input voltage rating, 250mA output current, and comprehensive protection feature set.

For Applications with Reduced Input Voltage Requirements: MCP1703-5002E/DB provides active status and ROHS3 compliance with superior quiescent current performance (5 µA versus 300 µA). This part is suitable for applications where input voltage does not exceed 16V and lower standby power consumption is beneficial.

For Applications Requiring Higher Output Current: TC1108-5.0VDBTR and LT1521 series parts deliver 300mA output current in the same SOT-223-3 package. TC1108-5.0VDBTR is limited to 6V input maximum, while LT1521 variants support up to 20V input. Both offer active status and ROHS3 compliance.

For Applications with 30V Input Voltage Requirement and Lower Output Current Tolerance: LT1121 series parts (150mA output) maintain the full 30V input voltage rating with active status and ROHS3 compliance. These are suitable only where 150mA output current is sufficient.

All substitute parts are available in active product status with ROHS3 compliance, addressing the obsolescence and compliance limitations of the original MIC2954-03BS.

Frequently Asked Questions (FAQ)

Q: Can MIC2954-03WS directly replace MIC2954-03BS in existing designs? A: Yes. MIC2954-03WS is electrically and mechanically identical to MIC2954-03BS, differing only in packaging format (tube versus bulk) and product status (active versus obsolete). No design changes are required.

Q: What is the key difference between MCP1703-5002E/DB and MIC2954-03BS? A: MCP1703-5002E/DB reduces input voltage maximum from 30V to 16V and quiescent current from 300 µA to 5 µA. It is suitable only for applications where input voltage remains below 16V.

Q: Can LT1121 series parts replace MIC2954-03BS in all applications? A: LT1121 series parts are limited to 150mA output current, compared to 250mA for MIC2954-03BS. They are suitable only for applications requiring 150mA or less. They maintain the 30V input voltage rating and offer active status with ROHS3 compliance.

Q: What are the packaging differences among substitute parts? A: MIC2954-03WS is supplied in tube packaging. MIC2954-02WS is supplied in tube packaging. LT1121 and LT1521 variants are available in tube (#PBF) or cut tape with Digi-Reel (#TRPBF) packaging. All maintain SOT-223-3 surface mount compatibility.

Q: Which substitute offers the best quiescent current performance? A: MCP1703-5002E/DB offers 5 µA quiescent current, significantly lower than the original 300 µA. This is beneficial for battery-powered or low-power standby applications, provided input voltage remains below 16V.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original MIC2954-03BS is non-compliant. Compliance is a key advantage of all recommended substitutes for new designs and production.

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