LP2957AISX Equivalent & Substitute Parts

Part Overview

The LP2957AISX is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output applications with 250mA current capacity in a TO-263 (DDPAK-5) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part provides integrated protection features including over-current, over-temperature, and reverse polarity protection, with an enable control feature for power management flexibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.8V @ 250mA
Quiescent Current	200 µA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-263-6 (D2PAK, 5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Reverse Polarity
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP2957AISX are determined by strict equivalence across the following critical parameters:

Output voltage and current specifications (5V, 250mA)
Input voltage rating (30V maximum)
Dropout voltage performance (0.8V @ 250mA)
Package and pinout compatibility (TO-263-6, D2PAK-5)
Protection and control feature set (Over Current, Over Temperature, Reverse Polarity, Enable)
Operating temperature range (-40°C ~ 125°C)
Quiescent current characteristics (200 µA)

All substitute parts listed maintain identical electrical and mechanical specifications, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Parameter	LP2957AISX	LP2957AISX/NOPB	LP2957ISX/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	5V	5V	5V
Output Current	250mA	250mA	250mA
Input Voltage (Max)	30V	30V	30V
Dropout Voltage (Max)	0.8V @ 250mA	0.8V @ 250mA	0.8V @ 250mA
Quiescent Current	200 µA	200 µA	200 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	TO-263-6	TO-263-6	TO-263-6
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Control Features	Enable	Enable	Enable
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Both LP2957AISX/NOPB and LP2957ISX/NOPB are active product alternatives to the obsolete LP2957AISX. The primary distinction between these substitutes lies in product status and regulatory compliance:

LP2957AISX/NOPB maintains the same device designation as the original part with NOPB (No Plumbum/Lead-Free) packaging, offering ROHS3 compliance and active product status. This part is available in Tape & Reel format suitable for automated assembly.

LP2957ISX/NOPB represents an industrial temperature grade variant within the same LP2957 family, also offering ROHS3 compliance and active status. This part is similarly available in Tape & Reel packaging.

Both substitutes provide identical electrical performance and package compatibility. Selection between them should be based on supply chain availability, packaging requirements, and compliance certifications applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can LP2957AISX/NOPB directly replace the obsolete LP2957AISX?

A: Yes. Both parts share identical electrical specifications, output voltage (5V), current rating (250mA), dropout voltage (0.8V @ 250mA), and TO-263-6 package pinout. The primary difference is that LP2957AISX/NOPB is an active product with ROHS3 compliance and Tape & Reel packaging.

Q: What is the difference between LP2957AISX/NOPB and LP2957ISX/NOPB?

A: Both parts are functionally equivalent with identical electrical and mechanical specifications. The designation difference reflects internal Texas Instruments product line categorization. Both are active products with ROHS3 compliance and Tape & Reel availability.

Q: Are the substitute parts pin-compatible with the original LP2957AISX?

A: Yes. All three parts use the TO-263-6 (D2PAK-5) package with identical pinout and lead configuration, enabling direct PCB replacement without layout modifications.

Q: What compliance certifications apply to the substitute parts?

A: Both LP2957AISX/NOPB and LP2957ISX/NOPB are ROHS3 compliant and REACH unaffected. The original LP2957AISX is RoHS non-compliant, making the substitutes necessary for applications requiring regulatory compliance.

Q: Are there packaging format differences between the original and substitute parts?

A: Yes. The original LP2957AISX is supplied in bulk packaging, while both substitutes (LP2957AISX/NOPB and LP2957ISX/NOPB) are supplied in Tape & Reel (TR) format, which is standard for automated assembly processes.

Q: Do the substitute parts maintain the same protection features?

A: Yes. All three parts include identical protection features: over-current protection, over-temperature protection, and reverse polarity protection, along with enable control functionality.

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