LP2954AIT Linear Voltage Regulator 5V 250mA TO-220-3 Equivalent & Substitute Parts

Part Overview

The LP2954AIT is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 250mA in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LP2954AIT provides essential power management functionality with integrated protection features including over-current, over-temperature, and reverse polarity protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP2954AIT
Product Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.8V @ 250mA
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP2954AIT are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed 5V output voltage
TO-220-3 package configuration
Through-hole mounting type
Operating temperature range of -40°C to 125°C
Output current capability (minimum 250mA required)
Protection features (over-current and over-temperature minimum)

Substitutes are grouped into two categories: direct equivalents maintaining identical 250mA output current specifications, and parametric equivalents with higher current ratings that provide backward compatibility while offering enhanced performance headroom. All substitute parts maintain the same output voltage, package, and mounting configuration as the original LP2954AIT.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout	Package	Product Status	RoHS Status
LP2954AIT	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-220-3	Obsolete	Non-compliant
LP2954AIT/NOPB	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-220-3	Active	ROHS3 Compliant
LP2954IT/NOPB	National Semiconductor	5V	250mA	30V	0.8V @ 250mA	TO-220-3	Active	Not specified
MIC2954-02WT	Microchip Technology	5V	250mA	30V	0.6V @ 250mA	TO-220-3	Active	ROHS3 Compliant
MIC2954-03WT	Microchip Technology	5V	250mA	30V	0.6V @ 250mA	TO-220-3	Active	ROHS3 Compliant
MIC2937A-5.0WT	Microchip Technology	5V	750mA	26V	Not specified	TO-220-3	Active	ROHS3 Compliant
MIC2940A-5.0WT	Microchip Technology	5V	1.25A	26V	0.6V @ 1.25A	TO-220-3	Active	ROHS3 Compliant
MIC29150-5.0WT	Microchip Technology	5V	1.5A	26V	0.6V @ 1.5A	TO-220-3	Active	ROHS3 Compliant
MIC29300-5.0WT	Microchip Technology	5V	3A	26V	0.6V @ 3A	TO-220-3	Active	ROHS3 Compliant
MIC29500-5.0WT	Microchip Technology	5V	5A	26V	0.6V @ 5A	TO-220-3	Active	ROHS3 Compliant
MIC2920A-5.0WT	Microchip Technology	5V	400mA	26V	0.75V @ 400mA	TO-220-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete LP2954AIT, the LP2954AIT/NOPB from Texas Instruments is the primary choice. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance, eliminating obsolescence risk for new production.

The LP2954IT/NOPB from National Semiconductor provides parametric equivalence with identical output current and voltage specifications, suitable for applications where manufacturer flexibility is acceptable.

For applications requiring enhanced current capacity beyond 250mA while maintaining 5V output and TO-220-3 packaging, the Microchip Technology MIC2954-02WT and MIC2954-03WT series offer direct pin-compatible alternatives with improved dropout voltage characteristics (0.6V versus 0.8V) and active product status with ROHS3 compliance.

Higher current variants from Microchip Technology (MIC2937A-5.0WT at 750mA, MIC2940A-5.0WT at 1.25A, MIC29150-5.0WT at 1.5A, MIC29300-5.0WT at 3A, and MIC29500-5.0WT at 5A) provide backward-compatible substitution for designs requiring increased output current capacity. These parts maintain the same 5V output voltage and TO-220-3 package but operate with a reduced maximum input voltage of 26V compared to the original 30V specification.

All recommended substitutes maintain the -40°C to 125°C operating temperature range and include over-current and over-temperature protection. Selection should be based on actual circuit current requirements and input voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can LP2954AIT/NOPB be used as a direct replacement for LP2954AIT?

A: Yes. LP2954AIT/NOPB is a direct equivalent with identical electrical specifications (5V output, 250mA current, 30V maximum input, 0.8V dropout), same TO-220-3 package, and through-hole mounting. The primary difference is active product status and ROHS3 compliance versus the obsolete non-compliant original.

Q: What is the difference between direct equivalents and parametric equivalents?

A: Direct equivalents (LP2954AIT/NOPB, LP2954IT/NOPB, MIC2954-02WT, MIC2954-03WT) maintain the 250mA output current specification. Parametric equivalents (MIC2937A-5.0WT, MIC2940A-5.0WT, MIC29150-5.0WT, MIC29300-5.0WT, MIC29500-5.0WT) provide higher current ratings while maintaining 5V output and TO-220-3 packaging, offering backward compatibility with enhanced performance headroom.

Q: Are all substitute parts pin-compatible with LP2954AIT?

A: All listed substitutes use the TO-220-3 package with identical pin configuration, ensuring mechanical and electrical pin compatibility for through-hole PCB mounting.

Q: What is the impact of reduced maximum input voltage in Microchip parts?

A: Microchip Technology substitutes (except MIC2954-02WT and MIC2954-03WT) specify 26V maximum input voltage versus 30V for the original LP2954AIT. Applications operating at input voltages between 26V and 30V require verification against actual circuit requirements before substitution.

Q: Do all substitutes include the same protection features?

A: All substitutes include over-current and over-temperature protection. Additional protection features vary by part number. MIC2954-02WT and MIC2954-03WT include load dump and UV POR protection. Microchip MIC29 series includes transient voltage protection on higher current variants.

Q: What is the significance of RoHS compliance status?

A: ROHS3-compliant parts meet current environmental regulations for new production and procurement. The original LP2954AIT is RoHS non-compliant, making ROHS3-compliant substitutes necessary for applications subject to environmental compliance requirements.

Q: Can higher current-rated parts be used in applications designed for 250mA?

A: Yes. Higher current-rated substitutes are backward compatible and will operate correctly in 250mA applications. The regulator will supply only the current demanded by the circuit, making higher-rated parts suitable for designs with potential future current expansion.

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