LM2940CT-15 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2940CT-15 is a positive fixed linear voltage regulator IC manufactured by Texas Instruments, designed for power management applications requiring 15V output at 1A maximum current. This device operates in the TO-220-3 package and provides integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection.

The LM2940CT-15 carries a Last Time Buy product status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications currently utilizing this regulator.

Substiute Parts

LM2940CT-15

Texas InstrumentsIn Stock: 1974LM2940CT-15 Datasheet

Current PartRFQ

LM2940CT-15/NOPB

Texas InstrumentsIn Stock: 2326LM2940CT-15/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2940CT-15 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 15V fixed
• Output current capability: 1A minimum
• Input voltage tolerance: 26V maximum
• Voltage dropout characteristics: 0.8V @ 1A maximum
• Package configuration: TO-220-3 through-hole mounting
• Protection feature set: Over-current, over-temperature, reverse polarity, and short-circuit protection
• Regulatory compliance: ROHS3 compliance and REACH unaffected status

Parts meeting all these criteria are classified as direct substitutes. Variations in product status, inventory availability, or packaging format do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM2940CT-15/NOPB is a direct electrical and mechanical equivalent to the LM2940CT-15. Both parts are manufactured by Texas Instruments and share identical electrical specifications, package configuration, and regulatory compliance certifications.

The primary distinction between these parts is product status: the LM2940CT-15 is designated Last Time Buy, while the LM2940CT-15/NOPB maintains Active status. The "/NOPB" suffix indicates lead-free plating without lead (Pb), reflecting modern manufacturing standards. Both parts meet ROHS3 compliance requirements.

For new designs or applications requiring long-term supply assurance, the LM2940CT-15/NOPB is the appropriate selection. For existing designs currently specified with the LM2940CT-15, direct substitution with LM2940CT-15/NOPB presents no electrical or mechanical compatibility concerns.

Frequently Asked Questions (FAQ)

Q: Can the LM2940CT-15/NOPB replace the LM2940CT-15 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM2940CT-15/NOPB features lead-free plating and maintains Active product status, making it suitable for direct substitution without circuit modification.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation specifies lead-free plating without lead (Pb), reflecting current manufacturing and environmental compliance standards. This does not affect electrical performance or package compatibility.

Q: Are there any differences in thermal performance between these parts?

A: No. Both parts share identical thermal characteristics, including quiescent current (10 mA) and voltage dropout specifications (0.8V @ 1A). Thermal management considerations remain unchanged.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the LM2940CT-15 and LM2940CT-15/NOPB are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

Q: Is the TO-220-3 package identical for both parts?

A: Yes. Both parts use the same TO-220-3 through-hole package configuration, ensuring identical PCB footprint and mounting requirements.

Q: What is the significance of the Last Time Buy status for the LM2940CT-15?

A: Last Time Buy status indicates that the manufacturer will discontinue production after current inventory is depleted. For applications requiring long-term component availability, transitioning to the LM2940CT-15/NOPB is recommended.