LP2954ISX Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP2954ISX is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output 5V regulator with 250mA output capacity in TO-263 (DDPAK-3) surface mount packaging. This device is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator features integrated protection against overcurrent, overtemperature, and reverse polarity conditions, with an enable control feature for power management applications.

Key Parameters

Parameter	LP2954ISX
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.8V @ 250mA
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LP2954ISX is determined by the following critical parameters: fixed 5V output voltage, TO-263 package compatibility, surface mount configuration, and operating temperature range of -40°C to 125°C. Substitute parts are grouped into two categories based on output current capacity and manufacturer compliance status.

Category 1: Direct Parametric Equivalents (Texas Instruments LP2954 Series) These parts maintain identical electrical specifications and package configuration as the original LP2954ISX. Substitution is valid based on matching output voltage, current rating, input voltage tolerance, dropout voltage, and thermal protection features.

Category 2: Higher Current Alternatives (Microchip Technology MIC Series) These parts provide the same 5V fixed output and TO-263 package but offer increased output current capacity (750mA to 3A) and improved dropout voltage performance. These are suitable for applications requiring higher current delivery or lower thermal dissipation.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status	RoHS Status
LP2954ISX	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-263-4	Obsolete	Non-compliant
LP2954AISX/NOPB	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-263-4	Active	ROHS3 Compliant
LP2954ISX/NOPB	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-263-4	Active	ROHS3 Compliant
MIC2937A-5.0WU	Microchip Technology	5V	750mA	26V	Not specified	TO-263-4	Active	ROHS3 Compliant
MIC2937A-5.0WU-TR	Microchip Technology	5V	750mA	26V	0.75V @ 750mA	TO-263-4	Active	ROHS3 Compliant
MIC29150-5.0WU	Microchip Technology	5V	1.5A	26V	0.6V @ 1.5A	TO-263-4	Active	ROHS3 Compliant
MIC29150-5.0WU-TR	Microchip Technology	5V	1.5A	26V	0.6V @ 1.5A	TO-263-4	Active	ROHS3 Compliant
MIC29300-5.0WU	Microchip Technology	5V	3A	26V	0.6V @ 3A	TO-263-4	Active	ROHS3 Compliant
MIC29300-5.0WU-TR	Microchip Technology	5V	3A	26V	0.6V @ 3A	TO-263-4	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LP2954AISX/NOPB and LP2954ISX/NOPB are active production alternatives to the obsolete LP2954ISX. Both maintain 250mA output current and identical electrical performance. LP2954AISX/NOPB and LP2954ISX/NOPB are ROHS3 compliant, addressing regulatory requirements that the original part does not meet. These are preferred for designs requiring no circuit modification.

For Higher Current Applications: Microchip Technology MIC series regulators (MIC2937A, MIC29150, MIC29300) provide increased output current capacity while maintaining 5V fixed output and TO-263 package compatibility. The MIC2937A-5.0WU-TR offers 750mA output with 0.75V dropout at rated current. The MIC29150 series provides 1.5A output with 0.6V dropout. The MIC29300 series delivers 3A output with 0.6V dropout. All Microchip parts are ROHS3 compliant and in active production status.

Packaging Considerations: Texas Instruments parts are available in Tape & Reel (TR) packaging. Microchip Technology parts are available in both Tube and Cut Tape (CT) & Digi-Reel® packaging options. Selection depends on production volume and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2954AISX/NOPB or LP2954ISX/NOPB be used as direct replacements for LP2954ISX? A: Yes. Both parts maintain identical electrical specifications: 5V fixed output, 250mA output current, 30V maximum input voltage, 0.8V dropout voltage at 250mA, and TO-263 package configuration. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the difference between Microchip MIC2937A, MIC29150, and MIC29300 regulators? A: These parts differ in output current capacity. MIC2937A provides 750mA, MIC29150 provides 1.5A, and MIC29300 provides 3A. All maintain 5V fixed output, TO-263 package, and -40°C to 125°C operating temperature range. Maximum input voltage is 26V for all Microchip parts, compared to 30V for the LP2954ISX.

Q: Are there packaging differences between substitute parts? A: Yes. Texas Instruments LP2954 variants are supplied in Tape & Reel (TR) packaging. Microchip Technology parts are available in Tube packaging or Cut Tape (CT) & Digi-Reel® packaging. Packaging selection should align with production volume and assembly line requirements.

Q: What is the significance of the /NOPB suffix on Texas Instruments parts? A: The /NOPB suffix indicates "No Plumbum" (lead-free) configuration, confirming RoHS compliance. This designation distinguishes compliant variants from non-compliant versions.

Q: Can Microchip MIC series regulators be used in applications originally designed for LP2954ISX? A: Yes, provided the application does not require the 30V maximum input voltage specification. Microchip parts are rated to 26V maximum input. If the application operates within 26V input limits, MIC series regulators are suitable substitutes with the added benefit of higher output current capacity and lower dropout voltage.

Q: What protection features are included in substitute parts? A: All substitute parts include overcurrent and overtemperature protection. Microchip MIC series parts additionally include reverse polarity and transient voltage protection. Texas Instruments LP2954 variants include reverse polarity protection matching the original part.

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