LP2954AIS Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP2954AIS 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 marked as obsolete product status. Due to its obsolete classification, direct equivalents and parametric substitutes with active product status are necessary for new designs and ongoing production requirements. Substitute parts maintain the same output voltage, package form factor, and core protection features while offering improved availability and compliance certifications.

Key Parameters

Parameter	LP2954AIS
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage	0.8V @ 250mA
Quiescent Current	150 µA
Operating Temperature Range	-40°C to 125°C
Package	TO-263-4 (D2PAK, 3 Leads + Tab)
Protection Features	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2954AIS are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: 5V fixed (mandatory match)
Package type: TO-263-4 (D2PAK, 3 Leads + Tab) surface mount (mandatory match)
Operating temperature range: -40°C to 125°C (mandatory match)
Output configuration: Positive fixed regulator (mandatory match)

Secondary Compatibility Parameters:

Output current capacity: 250mA minimum (equal or higher acceptable)
Input voltage rating: 26V to 30V maximum (acceptable range)
Protection features: Over current, over temperature, reverse polarity (core features required)
Mounting type: Surface mount (mandatory match)

Grouping Categories:

Direct Equivalent (Same Output Current): LP2954AIS/NOPB and LP2954IS/NOPB maintain identical 250mA output specifications with active product status and improved compliance certifications.

Higher Current Capacity Substitutes: MIC2937A-5.0WU (750mA), MIC2940A-5.0WU (1.25A), MIC29150-5.0WU (1.5A), and MIC29300-5.0WU (3A) from Microchip Technology provide increased output current while maintaining 5V fixed output, TO-263-3 package compatibility, and identical operating temperature range. These are suitable for applications where current headroom is beneficial.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Product Status	RoHS Status
LP2954AIS	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-263-4	Obsolete	Non-compliant
LP2954AIS/NOPB	Texas Instruments	5V	250mA	30V	0.8V @ 250mA	TO-263-4	Active	ROHS3 Compliant
LP2954IS/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
MIC2940A-5.0WU	Microchip Technology	5V	1.25A	26V	0.6V @ 1.25A	TO-263-4	Active	ROHS3 Compliant
MIC2940A-5.0WU-TR	Microchip Technology	5V	1.25A	26V	0.6V @ 1.25A	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): LP2954AIS/NOPB is the primary direct substitute, offering identical electrical specifications with active product status and ROHS3 compliance. This part is suitable for applications requiring exact parameter matching with improved supply chain availability. LP2954IS/NOPB provides an alternative from the same manufacturer with equivalent performance and active status, though REACH status differs.

For Applications Requiring Higher Current Capacity: Microchip Technology MIC series regulators (MIC2937A, MIC2940A, MIC29150, MIC29300) provide increased output current ratings while maintaining 5V fixed output and TO-263 package compatibility. These parts are suitable for designs where current margin is required or where load conditions exceed 250mA. All Microchip substitutes carry ROHS3 compliance and active product status.

Packaging Considerations: Tube packaging (standard) is suitable for manual assembly and lower-volume production. Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) packaging options are available for high-volume automated assembly operations. Selection depends on production volume and assembly equipment capabilities.

Compliance Status: All recommended substitutes carry ROHS3 compliance, addressing the non-compliant status of the obsolete LP2954AIS. This ensures compatibility with modern procurement and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated substitute like the MIC29300-5.0WU in place of the LP2954AIS? A: Yes. The MIC29300-5.0WU provides 3A output capacity while maintaining 5V fixed output, TO-263 package form factor, and identical operating temperature range. Higher current capacity does not affect compatibility in applications requiring 250mA or less. The regulator will operate within its specified parameters.

Q: What is the difference between LP2954AIS/NOPB and LP2954IS/NOPB? A: Both parts are direct equivalents with identical electrical specifications, output voltage, current rating, and package. The primary difference is REACH status classification. Both maintain active product status and ROHS3 compliance.

Q: Are the Microchip MIC series regulators pin-compatible with the LP2954AIS? A: Yes. All substitute parts use TO-263-4 (D2PAK, 3 Leads + Tab) package with identical pinout configuration. Direct PCB substitution is possible without layout modifications.

Q: What is the significance of the dropout voltage difference between LP2954AIS (0.8V) and Microchip substitutes (0.6V)? A: Lower dropout voltage in Microchip parts indicates improved efficiency at the specified current rating. For the LP2954AIS at 250mA, the 0.8V dropout applies. Microchip parts achieve 0.6V dropout at their respective higher current ratings. In applications limited to 250mA, both specifications are acceptable.

Q: Can I use the MIC2937A-5.0WU-TR (750mA) instead of the MIC29300-5.0WU-TR (3A)? A: Yes, if your application current requirement does not exceed 750mA. Both parts maintain 5V output and TO-263 package compatibility. Selection should be based on actual load current requirements and thermal considerations.

Q: What packaging should I specify for high-volume production? A: For automated assembly, specify Tape & Reel (TR) packaging options such as MIC29300-5.0WU-TR or MIC2940A-5.0WU-TR. For manual assembly or lower volumes, Tube packaging (standard) is appropriate.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitutes carry ROHS3 compliance certification, addressing the non-compliant status of the obsolete LP2954AIS.

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