MIC2954-03BZ Equivalent & Substitute Parts

Part Overview

The MIC2954-03BZ is a linear voltage regulator IC from Microchip Technology designed for positive fixed 5V output at 250mA in a TO-92-3 package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement. The device operates across -40°C to 125°C and includes comprehensive protection features including load dump, over current, over temperature, reverse polarity, and UV power-on reset protection.

Key Parameters

Parameter	MIC2954-03BZ
Manufacturer	Microchip Technology
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage	0.6V @ 250mA
Quiescent Current	300 µA
Operating Temperature	-40°C ~ 125°C
Package	TO-92-3
Mounting Type	Through Hole
Product Status	Discontinued

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Fixed output voltage of 5V
TO-92-3 package (through-hole mounting)
Input voltage rating of 30V maximum
Operating temperature range compatibility
Output current capability (minimum 100mA required for most applications)

The three substitute parts meet these core criteria. However, output current ratings vary: LP2950-50LPRE3 provides 100mA, while both LT1121 variants provide 150mA. Selection depends on application current requirements relative to the original 250mA specification.

Parameter Comparison

Parameter	MIC2954-03BZ	LP2950-50LPRE3	LT1121CZ-5#PBF	LT1121IZ-5#PBF
Manufacturer	Microchip Technology	Texas Instruments	Analog Devices Inc.	Linear Technology
Output Voltage	5V	5V	5V	5V
Output Current	250mA	100mA	150mA	150mA
Input Voltage (Max)	30V	30V	30V	30V
Dropout Voltage	0.6V @ 250mA	0.6V @ 100mA	0.7V @ 150mA	0.7V @ 150mA
Quiescent Current	300 µA	120 µA	50 µA	50 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Package	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Discontinued	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing support, addressing the discontinuation status of the MIC2954-03BZ.

LP2950-50LPRE3 from Texas Instruments is ROHS3 compliant and offers the lowest quiescent current at 120 µA. This part is suitable for applications requiring 100mA or less. The 0.6V dropout voltage matches the original specification.

LT1121CZ-5#PBF from Analog Devices Inc. is ROHS3 compliant with a 50 µA quiescent current and includes an Enable control feature. Operating temperature range is 0°C to 125°C, which is narrower than the original. This part supports 150mA output current.

LT1121IZ-5#PBF from Linear Technology maintains the full -40°C to 125°C operating temperature range of the original part and provides 150mA output current with 50 µA quiescent current. This variant is preferred for applications requiring the extended low-temperature specification.

Frequently Asked Questions (FAQ)

Q: Can LP2950-50LPRE3 replace MIC2954-03BZ in all applications?

A: No. The LP2950-50LPRE3 is rated for 100mA maximum output current, while the MIC2954-03BZ is rated for 250mA. Use this substitute only if your application draws 100mA or less.

Q: What is the difference between LT1121CZ-5#PBF and LT1121IZ-5#PBF?

A: Both provide identical electrical performance at 150mA output current and 50 µA quiescent current. The primary difference is operating temperature range: LT1121CZ-5#PBF operates 0°C to 125°C, while LT1121IZ-5#PBF operates -40°C to 125°C. Select based on your minimum operating temperature requirement.

Q: Are all substitutes pin-compatible with the MIC2954-03BZ?

A: Yes. All substitute parts use the TO-92-3 package with identical pinout for through-hole mounting.

Q: Which substitute has the best low-temperature performance?

A: LT1121IZ-5#PBF maintains the full -40°C to 125°C operating range matching the original MIC2954-03BZ specification.

Q: Do the substitutes include the same protection features?

A: Protection features vary. The MIC2954-03BZ includes load dump, over current, over temperature, reverse polarity, and UV POR protection. LP2950-50LPRE3 includes over current and over temperature. Both LT1121 variants include over temperature and reverse polarity protection. Verify protection requirements for your specific application.

Q: What is the RoHS compliance status of these substitutes?

A: LP2950-50LPRE3 and LT1121CZ-5#PBF are ROHS3 compliant. LT1121IZ-5#PBF RoHS status is not specified in available data.

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