LM2990S-15 Equivalent & Substitute Parts

Part Overview

The LM2990S-15 is a linear voltage regulator IC designed for negative fixed output applications. This negative low-dropout regulator delivers 1.8A output current with a fixed -15V output and operates across an input voltage range up to -26V. The device is housed in a TO-263 (DDPAK-3) surface mount package and includes integrated protection features for over-temperature and short-circuit conditions.

The LM2990S-15 is classified as Last Time Buy, indicating discontinued production from the original manufacturer. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this specific negative voltage regulation topology.

Substiute Parts

LM2990S-15

Texas InstrumentsIn Stock: 4010LM2990S-15 Datasheet

Current PartRFQ

LM2990S-15/NOPB

National SemiconductorIn Stock: 1033LM2990S-15/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2990S-15 is determined by strict equivalence across the following critical parameters:

• Output configuration (negative polarity)
• Fixed output voltage (-15V)
• Output current capability (1.8A minimum)
• Input voltage rating (-26V maximum)
• Voltage dropout specification (1V @ 1A maximum)
• Package compatibility (TO-263 DDPAK-3 surface mount)
• Protection features (over-temperature and short-circuit)
• Operating temperature range (-40°C to 125°C)

Parts meeting all these criteria are classified as direct electrical and mechanical equivalents. Substitutes must maintain identical electrical performance and physical form factor to ensure drop-in compatibility without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The LM2990S-15/NOPB serves as a direct substitute for the LM2990S-15. Both parts are manufactured variants of the LM2990 base product and maintain identical electrical specifications and package configuration. The primary distinction is product status: the original LM2990S-15 is Last Time Buy, while the LM2990S-15/NOPB remains in Active production status.

For new designs or ongoing production requiring negative 15V regulation at 1.8A, the LM2990S-15/NOPB is the appropriate selection due to its active manufacturing status and assured long-term availability. Both parts comply with RoHS3 and REACH regulations, supporting modern supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM2990S-15/NOPB replace the LM2990S-15 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM2990S-15/NOPB is a direct substitute with no circuit modifications required. Pin configuration, electrical performance, and package dimensions are equivalent.

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

A: The "/NOPB" designation indicates the part is supplied in bulk packaging without lead-free plating. This is a packaging and distribution variant that does not affect electrical performance or functionality.

Q: Are there any compliance differences between these parts?

A: The LM2990S-15 is specified as ROHS3 compliant. Compliance status for the LM2990S-15/NOPB is not provided in the available data. Verify specific compliance requirements with your supplier or design requirements documentation.

Q: Why is the original LM2990S-15 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. This is a standard lifecycle notification. The LM2990S-15/NOPB remains in active production and is the recommended source for ongoing supply.

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

A: No. Both parts maintain identical thermal characteristics, quiescent current, PSRR, and dropout voltage specifications across the full operating temperature range of -40°C to 125°C.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts use the identical TO-263 (DDPAK-3) package with the same pin configuration and footprint. No PCB modifications are necessary for substitution.