LP2957IS/NOPB Equivalent & Substitute Parts

Part Overview

The LP2957IS/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 250mA in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 5V output with integrated protection features including over-current, over-temperature, and reverse polarity protection, suitable for applications requiring stable low-current power supply regulation.

Substiute Parts

LP2957IS/NOPB

Texas InstrumentsIn Stock: 911LP2957IS/NOPB Datasheet

Current PartRFQ

LM9071S/NOPB

Texas InstrumentsIn Stock: 1178LM9071S/NOPB Datasheet

MFR RecommendedRFQ

LP2957AIT/NOPB

Texas InstrumentsIn Stock: 1497LP2957AIT/NOPB Datasheet

MFR RecommendedRFQ

MIC29201-5.0WU

Microchip TechnologyIn Stock: 13853MIC29201-5.0WU Datasheet

MFR RecommendedRFQ

TC1263-5.0VETTR

Microchip TechnologyIn Stock: 1948TC1263-5.0VETTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2957IS/NOPB is determined by the following critical parameters: fixed 5V output voltage, surface mount package compatibility (TO-263 DDPAK-5 form factor), output current capability of at least 250mA, maximum input voltage rating of 26V or higher, dropout voltage performance at rated current, and operating temperature range of -40°C to 125°C. The substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Package and Performance Match (TO-263 Surface Mount)

• LM9071S/NOPB: Identical package, same output current rating, active product status
• MIC29201-5.0WU: Identical package, higher output current (400mA), active product status
• TC1263-5.0VETTR: Identical package, higher output current (500mA), active product status

Category 2: Package Variant (Through-Hole Alternative)

• LP2957AIT/NOPB: Same base product family, TO-220-5 through-hole package, active product status

Parameter Comparison

Engineering Selection Recommendations

For surface mount applications requiring direct form-factor compatibility with the LP2957IS/NOPB, the LM9071S/NOPB is the primary substitute. It maintains identical TO-263 packaging, matching output current specification of 250mA, and is an active product with ROHS3 compliance. The LM9071S/NOPB is suitable for direct PCB layout replacement without modification.

For applications where higher output current capability is beneficial within the same surface mount package footprint, both MIC29201-5.0WU and TC1263-5.0VETTR provide increased current ratings (400mA and 500mA respectively) while maintaining TO-263 package compatibility. The MIC29201-5.0WU supports input voltages up to 26V, matching the reduced input rating of the LM9071S/NOPB. The TC1263-5.0VETTR offers superior dropout voltage performance (0.65V) but is limited to 6V maximum input voltage, restricting its use to lower input voltage applications.

For through-hole mounting applications or designs requiring higher input voltage tolerance (30V), the LP2957AIT/NOPB provides the same electrical characteristics as the original part in an alternative TO-220-5 package format. This option requires PCB layout modification but maintains full compatibility with the original electrical specifications and is an active product with ROHS3 compliance.

All substitute parts maintain the -40°C to 125°C operating temperature range and are available in active product status with current manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the LM9071S/NOPB be used as a direct replacement for the LP2957IS/NOPB on existing PCBs?

A: Yes. Both parts use identical TO-263 (DDPAK-5) surface mount packaging with matching pinout and electrical specifications for 5V output at 250mA. No PCB modification is required for direct substitution.

Q: What is the primary difference between the LP2957IS/NOPB and LM9071S/NOPB?

A: The LM9071S/NOPB is the active product replacement for the obsolete LP2957IS/NOPB. Both share identical package, output voltage, and current ratings. The LM9071S/NOPB has a reduced maximum input voltage (26V vs 30V) and higher quiescent current (4 mA vs 200 µA), but provides ROHS3 compliance and current manufacturing availability.

Q: Can MIC29201-5.0WU or TC1263-5.0VETTR be used if higher output current is needed?

A: Yes, both parts provide higher output current capability (400mA and 500mA respectively) in the same TO-263 package footprint. However, verify that your application's input voltage requirements are compatible: MIC29201-5.0WU supports up to 26V input, while TC1263-5.0VETTR is limited to 6V maximum input voltage.

Q: Why is the TC1263-5.0VETTR limited to 6V input voltage?

A: The TC1263-5.0VETTR is designed for low-input-voltage applications. Applications requiring higher input voltage tolerance should use LM9071S/NOPB or MIC29201-5.0WU (both 26V rated) or LP2957AIT/NOPB (30V rated).

Q: Is the LP2957AIT/NOPB a suitable substitute if I cannot modify my PCB layout?

A: The LP2957AIT/NOPB uses a different package format (TO-220-5 through-hole vs TO-263 surface mount). It requires PCB layout modification and cannot be used as a direct drop-in replacement. Use this option only if your design can accommodate through-hole mounting.

Q: Are all substitute parts RoHS compliant?

A: The original LP2957IS/NOPB is RoHS non-compliant. All substitute parts (LM9071S/NOPB, LP2957AIT/NOPB, MIC29201-5.0WU, and TC1263-5.0VETTR) are ROHS3 compliant, meeting current environmental regulations.

Q: What is the moisture sensitivity level for these parts?

A: The LP2957IS/NOPB, LM9071S/NOPB, and MIC29201-5.0WU have MSL 3 (168 Hours). The LP2957AIT/NOPB and TC1263-5.0VETTR have MSL 1 (Unlimited), indicating superior moisture resistance for storage and handling.