LP3966ES-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3966ES-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 3A output current in a TO-263 (DDPAK-5) package and operates across an input voltage range up to 7V with adjustable output from 1.216V to 5.1V. The device includes integrated protection features for over-current, over-temperature, and short-circuit conditions, with an enable control feature for power management applications.

The LP3966ES-ADJ carries a Last Time Buy product status, making identification of equivalent substitute parts essential for design continuity and long-term component availability planning.

Substiute Parts

LP3966ES-ADJ

Texas InstrumentsIn Stock: 2060LP3966ES-ADJ Datasheet

Current PartRFQ

LP3966ES-ADJ/NOPB

Texas InstrumentsIn Stock: 1963LP3966ES-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3966ES-ADJ is determined by strict equivalence across the following critical parameters:

Electrical Specifications: Output configuration (positive adjustable), output current rating (3A), input voltage maximum (7V), output voltage range (1.216V to 5.1V), dropout voltage (1.2V @ 3A), quiescent current (9 mA), and protection feature set (over-current, over-temperature, short-circuit).

Mechanical & Environmental: Package type (TO-263 DDPAK-5), mounting type (Surface Mount), operating temperature range (-40°C to 125°C), and moisture sensitivity level (MSL 3).

Compliance & Certification: RoHS3 compliance, REACH status, and regulatory classifications (ECCN, HTSUS).

Parts meeting all these criteria are classified as direct equivalents and may be substituted without circuit redesign or board layout modification.

Parameter Comparison

Engineering Selection Recommendations

The LP3966ES-ADJ/NOPB is a direct equivalent substitute for the LP3966ES-ADJ. Both parts are manufactured by Texas Instruments and share identical electrical specifications, package configuration, and compliance certifications.

The primary distinction is product lifecycle status: the original LP3966ES-ADJ is designated Last Time Buy, while the LP3966ES-ADJ/NOPB maintains Active status. This difference reflects manufacturing and supply chain positioning rather than functional or performance variation.

For new designs or long-term production requirements, the LP3966ES-ADJ/NOPB is the appropriate selection due to its Active product status and continued availability. For existing designs currently using LP3966ES-ADJ, direct substitution with LP3966ES-ADJ/NOPB requires no circuit modifications, layout changes, or performance re-qualification.

Both parts maintain ROHS3 compliance and identical moisture sensitivity specifications, ensuring compatibility with standard surface-mount assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can LP3966ES-ADJ/NOPB be used as a direct replacement for LP3966ES-ADJ in existing designs?

A: Yes. Both parts are electrically and mechanically identical. No circuit redesign, board layout modification, or performance re-qualification is required. The substitution is pin-compatible and functionally equivalent.

Q: What is the significance of the "/NOPB" suffix in LP3966ES-ADJ/NOPB?

A: The "/NOPB" designation indicates the part is supplied without lead-free plating on the leads. This is a packaging and supply chain designation that does not affect electrical performance or functional compatibility.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical RoHS3 compliance, REACH status, and regulatory classifications (ECCN EAR99, HTSUS 8542.39.0001). Moisture sensitivity level (MSL 3, 168 Hours) is identical for both.

Q: Why is the original LP3966ES-ADJ marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this specific part number variant. The LP3966ES-ADJ/NOPB remains in active production and is the recommended selection for new procurement and design continuity.

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

A: No. Operating temperature range (-40°C to 125°C), quiescent current (9 mA), dropout voltage (1.2V @ 3A), and all protection features are identical across both part numbers.

Q: What is the package compatibility for these parts?

A: Both parts use the TO-263 (DDPAK-5) package with 5 leads plus tab configuration. Board layouts, footprints, and thermal management designs are fully compatible without modification.