LP2954AIMX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2954AIMX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 250mA output current with adjustable voltage regulation from 1.23V to 29V, making it suitable for general-purpose power management circuits requiring low dropout performance.

The LP2954AIMX is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this regulator.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	29V
Voltage Dropout (Max)	0.8V @ 250mA
Current - Output	250mA
Current - Quiescent (Iq)	150 µA
Current - Supply (Max)	33 mA
Control Features	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)

Substitute Part Grouping Explanation

Substitute parts for the LP2954AIMX are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

Output configuration (Positive)
Output type (Adjustable)
Voltage range (Input Max: 30V, Output Min: 1.23V, Output Max: 29V)
Current rating (250mA output)
Dropout voltage (0.8V @ 250mA)
Package type (8-SOIC)
Control features (Enable function)
Protection features (Over Current, Over Temperature, Reverse Polarity)
Operating temperature range (-40°C ~ 125°C)

All identified substitutes match these parameters exactly, ensuring functional and mechanical compatibility in existing designs.

Parameter Comparison

Parameter	LP2954AIMX	LP2954AIMX/NOPB	LP2954IMX/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	30V	30V	30V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V
Voltage - Output (Max)	29V	29V	29V
Voltage Dropout (Max)	0.8V @ 250mA	0.8V @ 250mA	0.8V @ 250mA
Current - Output	250mA	250mA	250mA
Current - Quiescent (Iq)	150 µA	150 µA	150 µA
Current - Supply (Max)	33 mA	33 mA	33 mA
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LP2954AIMX/NOPB (National Semiconductor): This part is an active product with identical electrical and mechanical specifications to the LP2954AIMX. It is available in higher inventory quantities (49,228 pcs) and supplied in bulk packaging. This substitute is suitable for applications where RoHS compliance is not a design requirement.

LP2954IMX/NOPB (Texas Instruments): This part is an active product from the original manufacturer with identical electrical and mechanical specifications. It carries ROHS3 compliance certification, making it the preferred choice for designs requiring environmental compliance. Available inventory is 2,300 pcs in Cut Tape and Digi-Reel packaging formats.

For new designs or systems requiring regulatory compliance, LP2954IMX/NOPB is the recommended selection. For legacy system support where compliance is not mandated, either substitute provides functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP2954AIMX/NOPB and LP2954IMX/NOPB be used interchangeably with the LP2954AIMX?

A: Yes. All three parts share identical electrical parameters, output characteristics, protection features, and 8-SOIC package specifications. They are pin-compatible and functionally equivalent for circuit applications.

Q: What is the difference between LP2954AIMX/NOPB and LP2954IMX/NOPB?

A: The primary differences are product status (both active), manufacturer source, RoHS compliance status, and packaging format. LP2954IMX/NOPB includes ROHS3 compliance; LP2954AIMX/NOPB does not specify RoHS status. Electrical performance is identical.

Q: Why is the original LP2954AIMX listed as obsolete?

A: The LP2954AIMX has reached end-of-life status. The active substitutes LP2954AIMX/NOPB and LP2954IMX/NOPB provide continued availability and support for this regulator topology.

Q: Are there packaging differences between these parts?

A: All three parts use the 8-SOIC surface mount package. Packaging format differs: LP2954AIMX/NOPB is supplied in bulk; LP2954IMX/NOPB is available in Cut Tape and Digi-Reel formats. The physical package dimensions are identical.

Q: Which substitute should be selected for new production designs?

A: LP2954IMX/NOPB is recommended for new designs due to active product status and ROHS3 compliance certification. This ensures long-term supply availability and regulatory alignment.

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