LP2954IS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2954IS is a linear voltage regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device is a positive fixed output regulator rated for 5V at 250mA in a TO-263 (DDPAK-3) surface mount package. The part is currently listed as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. Active alternatives from both Texas Instruments and Microchip Technology are available to fulfill the same functional role in 5V regulated power supply applications.

Key Parameters

Parameter	LP2954IS Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	5V
Voltage - Input (Max)	30V
Current - Output	250mA
Voltage Dropout (Max)	0.8V @ 250mA
Current - Quiescent (Iq)	150 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Reverse Polarity
Control Features	Enable
Part Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LP2954IS is determined by the following critical parameters:

Fixed Output Voltage: All substitute parts must provide 5V fixed output to maintain circuit compatibility.

Package Compatibility: All substitutes use TO-263-4 (D2PAK with 3 Leads + Tab) surface mount packaging, ensuring mechanical and electrical pin compatibility.

Output Current Rating: The LP2954IS is rated for 250mA output. Substitutes with equal or higher current ratings (750mA, 1.5A, 3A) are functionally compatible, as they can deliver the required 250mA while providing additional headroom.

Input Voltage Range: The LP2954IS accepts input voltages up to 30V. Microchip substitutes rated for 26V maximum input are compatible with applications using input voltages up to 26V.

Operating Temperature Range: All substitutes maintain the -40°C to 125°C operating range, ensuring thermal compatibility.

Protection Features: All substitutes include over current and over temperature protection. Additional transient voltage protection in Microchip devices provides enhanced functionality without compromising compatibility.

Regulatory Compliance: The LP2954IS is RoHS non-compliant and obsolete. Active substitutes are RoHS3 compliant, meeting current regulatory requirements.

Parameter Comparison

Parameter	LP2954IS	LP2954IS/NOPB	LP2954AIS/NOPB	MIC2937A-5.0WU	MIC29150-5.0WU	MIC29300-5.0WU
Manufacturer	TI	TI	TI	Microchip	Microchip	Microchip
Output Voltage (Fixed)	5V	5V	5V	5V	5V	5V
Current - Output	250mA	250mA	250mA	750mA	1.5A	3A
Voltage - Input (Max)	30V	30V	30V	26V	26V	26V
Voltage Dropout (Max)	0.8V @ 250mA	0.8V @ 250mA	0.8V @ 250mA	0.75V @ 750mA	0.6V @ 1.5A	0.6V @ 3A
Current - Quiescent (Iq)	150 µA	150 µA	150 µA	300 µA	Not specified	Not specified
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-4	TO-263-4	TO-263-4	TO-263-4	TO-263-4	TO-263-4
Protection Features	OCP, OTP, RPP	OCP, OTP, RPP	OCP, OTP, RPP	OCP, OTP	OCP, OTP, RPP, TVP	OCP, OTP, RPP, TVP
Part Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Texas Instruments):

LP2954IS/NOPB and LP2954AIS/NOPB are direct parametric equivalents to the obsolete LP2954IS. Both parts maintain identical electrical specifications including 250mA output current, 0.8V dropout voltage, and 150 µA quiescent current. Both are active products with RoHS3 compliance, making them suitable for immediate substitution in existing designs. LP2954IS/NOPB differs only in packaging format (Tube vs. original specification), while LP2954AIS/NOPB is the temperature-rated variant. Selection between these two depends on procurement packaging requirements and inventory availability.

Higher Current Capacity Alternatives (Microchip Technology):

MIC2937A-5.0WU, MIC29150-5.0WU, and MIC29300-5.0WU provide increased output current capacity (750mA, 1.5A, and 3A respectively) while maintaining 5V fixed output and TO-263-4 package compatibility. These parts are suitable for applications where the original 250mA specification provides insufficient margin or where future current requirements may increase. All Microchip alternatives are active products with RoHS3 compliance.

Input Voltage Consideration:

Microchip substitutes are rated for maximum 26V input, compared to the LP2954IS 30V maximum. Applications requiring input voltages between 26V and 30V must use Texas Instruments alternatives (LP2954IS/NOPB or LP2954AIS/NOPB).

Compliance and Availability:

All recommended substitutes are RoHS3 compliant and currently in active production. The LP2954IS is obsolete and should not be specified for new designs. For existing designs using LP2954IS, transition to LP2954IS/NOPB or LP2954AIS/NOPB ensures regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MIC2937A-5.0WU directly replace LP2954IS in my circuit?

A: MIC2937A-5.0WU is functionally compatible if your application operates with input voltages up to 26V and requires no more than 750mA output current. The TO-263-4 package pinout is identical. However, if your circuit requires input voltages between 26V and 30V, use LP2954IS/NOPB or LP2954AIS/NOPB instead.

Q: What is the difference between LP2954IS/NOPB and LP2954AIS/NOPB?

A: Both parts are direct equivalents with identical electrical specifications. LP2954AIS/NOPB is the temperature-rated variant. Selection depends on your procurement requirements and inventory availability. Both are active products suitable for new designs.

Q: Why do Microchip parts have lower maximum input voltage (26V vs. 30V)?

A: This is a design specification difference between manufacturers. Microchip MIC series regulators are rated for 26V maximum input. If your application requires 30V input capability, select Texas Instruments LP2954IS/NOPB or LP2954AIS/NOPB.

Q: Can I use MIC29300-5.0WU (3A) instead of LP2954IS (250mA)?

A: Yes. MIC29300-5.0WU provides 3A output capacity, which exceeds the 250mA requirement. The higher current rating provides design margin and is electrically compatible. Package and pinout are identical. Verify that your circuit board thermal design accommodates the potentially higher power dissipation if operating at maximum current.

Q: Are all substitute parts RoHS compliant?

A: Yes. LP2954IS/NOPB, LP2954AIS/NOPB, and all Microchip alternatives (MIC2937A-5.0WU, MIC29150-5.0WU, MIC29300-5.0WU) are RoHS3 compliant. The original LP2954IS is RoHS non-compliant and obsolete.

Q: What packaging options are available for these substitutes?

A: Texas Instruments parts are available in Tube packaging. Microchip parts are available in Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR) formats. All use identical TO-263-4 (D2PAK) surface mount package. Select packaging based on your procurement and assembly requirements.

Q: Do Microchip parts include reverse polarity protection like the LP2954IS?

A: MIC2937A-5.0WU includes over current and over temperature protection but does not list reverse polarity protection. MIC29150-5.0WU and MIC29300-5.0WU include reverse polarity protection along with over current, over temperature, and transient voltage protection. If reverse polarity protection is critical, select MIC29150-5.0WU or MIC29300-5.0WU, or use LP2954IS/NOPB.

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