LP3997MM-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3997MM-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 250mA current capacity in an 8-VSSOP surface mount package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. The substitute part LP3997MM-3.3/NOPB maintains identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Substiute Parts

LP3997MM-3.3

Texas InstrumentsIn Stock: 2314LP3997MM-3.3 Datasheet

Current PartRFQ

LP3997MM-3.3/NOPB

Texas InstrumentsIn Stock: 2385LP3997MM-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3997MM-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage configuration: Positive fixed 3.3V
• Output current capacity: 250mA minimum
• Input voltage rating: 6V maximum
• Voltage dropout specification: 0.4V @ 250mA maximum
• Package type: 8-VSSOP surface mount
• Operating temperature range: -40°C ~ 85°C
• Protection features: Over temperature and short circuit protection
• Control features: Enable function

The LP3997MM-3.3/NOPB satisfies all substitution criteria as a direct equivalent with identical electrical performance and mechanical compatibility. The primary distinction is product status and compliance certification level.

Parameter Comparison

Engineering Selection Recommendations

The LP3997MM-3.3/NOPB is the direct substitute for the obsolete LP3997MM-3.3. Selection of the active part number is justified by:

• Identical electrical specifications across all critical parameters
• Mechanical compatibility with existing PCB layouts and assembly processes
• Active product status ensuring continued availability and supply chain reliability
• ROHS3 compliance certification versus non-compliant status of the original part
• Tape & Reel packaging format suitable for automated assembly operations

No functional or performance differences exist between these part numbers. The /NOPB designation indicates lead-free plating and compliance with current environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can LP3997MM-3.3/NOPB be used as a direct replacement for LP3997MM-3.3?

A: Yes. Both parts are electrically and mechanically identical. The substitute part offers active product status and improved compliance certifications.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation specifies lead-free plating and compliance with RoHS3 environmental standards. This affects manufacturing processes but not electrical performance.

Q: Are there package compatibility concerns when substituting?

A: No. Both parts use the 8-VSSOP package with identical 0.118" (3.00mm) width specifications. PCB footprints and assembly processes remain unchanged.

Q: What is the significance of product status difference?

A: The obsolete status of LP3997MM-3.3 indicates discontinued manufacturing. LP3997MM-3.3/NOPB maintains active production status, ensuring long-term availability and supply chain continuity.

Q: Are there compliance or certification differences?

A: LP3997MM-3.3/NOPB carries ROHS3 compliance certification, while the original part is RoHS non-compliant. This affects regulatory acceptance in certain markets and applications.

Q: Do electrical performance specifications differ?

A: No. Output voltage, current capacity, dropout voltage, quiescent current, PSRR, protection features, and operating temperature range are identical across both part numbers.