LP2957AIS/NOPB Equivalent & Substitute Parts

Part Overview

The LP2957AIS/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 5V output at 250mA in a TO-263 (DDPAK-5) surface mount package. This device features integrated protection against overcurrent, overtemperature, and reverse polarity conditions, with an enable control feature for power management applications.

The LP2957AIS/NOPB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this regulator.

Substiute Parts

LP2957AIS/NOPB

Texas InstrumentsIn Stock: 1038LP2957AIS/NOPB Datasheet

Current PartRFQ

TC1263-5.0VETTR

Microchip TechnologyIn Stock: 1948TC1263-5.0VETTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2957AIS/NOPB is determined by the following critical parameters:

Output voltage matching at 5V fixed regulation is mandatory. The substitute part must maintain identical output voltage specification to ensure direct functional replacement without circuit redesign.

Package compatibility in TO-263-6 (D2PAK with 5 leads plus tab) is required for PCB layout and thermal management continuity. The identical package ensures mechanical fit and thermal performance characteristics remain unchanged.

Output current capability must meet or exceed the 250mA specification of the original part. The substitute part TC1263-5.0VETTR provides 500mA output current, which exceeds the minimum requirement and offers enhanced current delivery capability.

Input voltage rating must accommodate the maximum 30V input specification. The substitute part is rated for 6V maximum input, which represents a constraint in this substitution relationship.

Operating temperature range of -40°C to 125°C must be maintained for thermal environment compatibility.

Protection features including overcurrent and overtemperature protection are required. The substitute part provides these protections; reverse polarity protection is not specified for the substitute.

Surface mount packaging and enable control feature availability are required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The TC1263-5.0VETTR from Microchip Technology is an active product suitable for replacing the obsolete LP2957AIS/NOPB in applications where input voltage does not exceed 6V. Both parts maintain ROHS3 compliance and identical operating temperature specifications.

The substitute part offers improved performance characteristics including lower quiescent current (130 µA vs. 200 µA) and superior voltage dropout performance (0.65V vs. 0.8V at rated current). Output current capability is doubled to 500mA, providing design margin for current-limited applications.

The critical design constraint is the reduced maximum input voltage rating of the substitute part (6V vs. 30V). Applications requiring input voltages above 6V cannot use the TC1263-5.0VETTR without circuit modification or alternative component selection.

Both parts are packaged identically in TO-263-6 (D2PAK-5), enabling direct PCB layout compatibility. The substitute part is available in active production status with established supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the TC1263-5.0VETTR directly replace the LP2957AIS/NOPB on existing PCBs?

A: Yes, for applications where input voltage does not exceed 6V. The identical TO-263-6 package ensures mechanical and thermal compatibility. Pin configuration and enable control functionality are compatible.

Q: What is the primary limitation of using TC1263-5.0VETTR as a substitute?

A: The maximum input voltage rating is 6V, compared to 30V for the original part. Applications requiring higher input voltages must use alternative components or implement input voltage limiting circuitry.

Q: Does the substitute part provide equivalent protection features?

A: The TC1263-5.0VETTR provides overcurrent and overtemperature protection. Reverse polarity protection specified for the LP2957AIS/NOPB is not listed for the substitute part. Circuit-level reverse polarity protection may be required if this feature is critical to the application.

Q: Are there compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. Both carry EAR99 ECCN classification. Moisture sensitivity levels differ: LP2957AIS/NOPB is MSL 3 (168 hours), while TC1263-5.0VETTR is MSL 1 (unlimited).

Q: What are the performance advantages of the substitute part?

A: The TC1263-5.0VETTR offers lower quiescent current consumption (130 µA vs. 200 µA), lower voltage dropout (0.65V vs. 0.8V), and double the output current capability (500mA vs. 250mA). PSRR is specified at 64dB (1kHz) for the substitute.

Q: Is the substitute part currently available?

A: Yes. The TC1263-5.0VETTR is classified as active product status with established manufacturing and distribution channels, ensuring supply chain continuity compared to the obsolete LP2957AIS/NOPB.