LP3990SD-1.2 Equivalent & Substitute Parts

Part Overview

The LP3990SD-1.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 1.2V output with a maximum dropout voltage of 0.2V at rated load. The part is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. The LP3990SD-1.2/NOPB variant provides functional equivalence with active product status and improved compliance characteristics.

Substiute Parts

LP3990SD-1.2

Texas InstrumentsIn Stock: 770LP3990SD-1.2 Datasheet

Current PartRFQ

LP3990SD-1.2/NOPB

Texas InstrumentsIn Stock: 2668LP3990SD-1.2/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3990SD-1.2 is based on electrical and mechanical parameter equivalence. The primary substitute, LP3990SD-1.2/NOPB, maintains identical electrical specifications across all critical parameters: fixed 1.2V output, 150mA current capacity, 0.2V maximum dropout voltage, 80 µA quiescent current, and -40°C to 85°C operating range. Both parts use the 6-WSON (3x3) package with identical pinout and mechanical dimensions. The key differentiator is product status and compliance: LP3990SD-1.2/NOPB is active and RoHS3 compliant, whereas the original LP3990SD-1.2 is obsolete and RoHS non-compliant. Packaging format differs (bulk versus tape & reel), but this does not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LP3990SD-1.2/NOPB is the direct functional equivalent for applications currently using LP3990SD-1.2. Selection of the NOPB variant is supported by three factors: identical electrical performance across all specified parameters, active product status ensuring long-term availability and supply chain continuity, and RoHS3 compliance meeting current regulatory requirements. The original LP3990SD-1.2 is obsolete and RoHS non-compliant, creating supply and compliance risks for new designs or production continuation. Both parts are mechanically and electrically interchangeable at the board level due to identical package geometry and pinout. Tape & Reel packaging of the NOPB variant is standard for production environments and does not affect component functionality.

Frequently Asked Questions (FAQ)

Q: Are LP3990SD-1.2 and LP3990SD-1.2/NOPB electrically identical?

A: Yes. Both parts deliver identical electrical performance: 1.2V fixed output, 150mA current capacity, 0.2V maximum dropout voltage, 80 µA quiescent current, and -40°C to 85°C operating range. All control and protection features are identical.

Q: Can LP3990SD-1.2/NOPB be used as a direct replacement on existing PCBs?

A: Yes. Both parts use the 6-WSON (3x3) package with identical pinout and mechanical dimensions. No PCB redesign is required.

Q: What is the difference between LP3990SD-1.2 and LP3990SD-1.2/NOPB?

A: The primary differences are product status, compliance, and packaging format. LP3990SD-1.2 is obsolete and RoHS non-compliant. LP3990SD-1.2/NOPB is active, RoHS3 compliant, and supplied in Tape & Reel format. Electrical and mechanical specifications are identical.

Q: Why is RoHS3 compliance important?

A: RoHS3 compliance ensures the part meets current environmental and regulatory standards for electronic components. This is essential for new designs and production continuation in regulated markets.

Q: Does packaging format affect component performance?

A: No. Tape & Reel packaging is a supply and handling format. It does not affect electrical performance, reliability, or board-level functionality of the component.