LP2957IT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2957IT is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 5V output at 250mA in a TO-220-5 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LP2957IT provides regulated power management with integrated protection features including over-current, over-temperature, and reverse polarity protection, suitable for applications requiring stable 5V power delivery in through-hole configurations.

Substiute Parts

LP2957IT

Texas InstrumentsIn Stock: 719LP2957IT Datasheet

Current PartRFQ

LP2957AIT/NOPB

Texas InstrumentsIn Stock: 1497LP2957AIT/NOPB Datasheet

Parametric EquivalentRFQ

TC1263-5.0VAT

Microchip TechnologyIn Stock: 1232TC1263-5.0VAT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2957IT are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

• Output voltage: 5V fixed
• Package type: TO-220-5
• Mounting type: Through hole
• Output configuration: Positive
• Protection features: Over-current and over-temperature protection
• Operating temperature range: -40°C to 125°C
• RoHS3 compliance

Parametric Equivalent: LP2957AIT/NOPB maintains identical electrical specifications and package configuration as the main part, with the distinction of active product status and improved moisture sensitivity rating (MSL 1 vs MSL 3).

Manufacturer Recommended Substitute: TC1263-5.0VAT from Microchip Technology provides functional substitution with enhanced output current capability (500mA vs 250mA) and improved dropout voltage performance (0.65V vs 0.8V), though with reduced maximum input voltage specification (6V vs 30V).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: LP2957AIT/NOPB is the appropriate selection when maintaining identical electrical performance is required. This part is an active product with improved moisture sensitivity characteristics, providing enhanced reliability for long-term storage and manufacturing environments. Both parts share identical output current, dropout voltage, and input voltage specifications.

For Enhanced Performance Applications: TC1263-5.0VAT offers increased output current capability (500mA) and lower quiescent current (130 µA), suitable for applications requiring higher current delivery or improved efficiency. This selection requires verification that the reduced maximum input voltage specification (6V) aligns with circuit design parameters. The improved dropout voltage (0.65V) provides operational advantage in low-input-voltage scenarios.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original LP2957IT specification.

Frequently Asked Questions (FAQ)

Q: Can LP2957AIT/NOPB be used as a direct replacement for LP2957IT?

A: Yes. LP2957AIT/NOPB maintains identical electrical specifications including 5V output, 250mA current rating, 0.8V dropout voltage, and 30V maximum input voltage. The primary difference is product status (active vs obsolete) and improved moisture sensitivity rating (MSL 1 vs MSL 3). Pin configuration and package type are identical.

Q: What are the limitations of TC1263-5.0VAT as a substitute?

A: TC1263-5.0VAT has a reduced maximum input voltage specification of 6V compared to the LP2957IT's 30V. This part is suitable only for applications where input voltage does not exceed 6V. The increased output current (500mA) and lower dropout voltage (0.65V) represent performance improvements for compatible input voltage ranges.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All listed parts use TO-220-5 package with through-hole mounting. LP2957IT specifies "Formed Leads" while TC1263-5.0VAT specifies standard TO-220-5; both are compatible with identical PCB footprints and mounting procedures.

Q: Do substitute parts require circuit design modifications?

A: LP2957AIT/NOPB requires no design modifications. TC1263-5.0VAT requires verification that maximum input voltage does not exceed 6V; if higher input voltages are present in the original design, this part is not suitable without circuit redesign.

Q: What is the significance of MSL rating differences?

A: MSL 3 (168 Hours) indicates moisture sensitivity requiring controlled storage conditions and limited shelf life after packaging opening. MSL 1 (Unlimited) indicates no moisture sensitivity restrictions. Both LP2957AIT/NOPB and TC1263-5.0VAT offer superior storage flexibility compared to the original LP2957IT.