LP3965EMPX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3965EMPX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1.5A output current in a compact SOT-223-5 package and is classified as Obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and long-term component sourcing strategies.

Substiute Parts

LP3965EMPX-ADJ

Texas InstrumentsIn Stock: 23650LP3965EMPX-ADJ Datasheet

Current PartRFQ

LP3965EMPX-ADJ/NOPB

Texas InstrumentsIn Stock: 4458LP3965EMPX-ADJ/NOPB Datasheet

DirectRFQ

LP3965EMP-ADJ

Texas InstrumentsIn Stock: 2743LP3965EMP-ADJ Datasheet

Parametric EquivalentRFQ

LP3965EMP-ADJ/NOPB

Texas InstrumentsIn Stock: 5396LP3965EMP-ADJ/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3965EMPX-ADJ is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Output Configuration: Positive
• Output Type: Adjustable
• Voltage - Input (Max): 7V
• Voltage - Output (Min/Fixed): 1.216V
• Voltage - Output (Max): 5.1V
• Voltage Dropout (Max): 0.55V @ 1.5A
• Current - Output: 1.5A
• Current - Quiescent (Iq): 9 mA
• Current - Supply (Max): 15 mA
• PSRR: 60dB ~ 40dB (120Hz)
• Control Features: Enable
• Protection Features: Over Current, Over Temperature, Short Circuit
• Operating Temperature: -40°C ~ 125°C

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Package / Case: TO-261-5, TO-261AB
• Supplier Device Package: SOT-223-5
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain identical electrical and mechanical specifications to the main part number, ensuring direct functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3965EMP-ADJ/NOPB

The LP3965EMP-ADJ/NOPB is the preferred substitute for the obsolete LP3965EMPX-ADJ. This part maintains complete electrical and mechanical equivalence while offering Active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant, meeting modern environmental and regulatory requirements. The /NOPB designation indicates lead-free plating, aligning with contemporary manufacturing standards.

Secondary Recommendation: LP3965EMPX-ADJ/NOPB

The LP3965EMPX-ADJ/NOPB provides direct compatibility with identical electrical specifications and Active product status. This variant is supplied in Tape & Reel (TR) packaging, suitable for high-volume automated assembly operations. ROHS3 compliance and lead-free plating are included.

Alternative Consideration: LP3965EMP-ADJ

The LP3965EMP-ADJ maintains full parametric equivalence but carries Last Time Buy status, indicating limited future availability. This part is suitable only for applications where immediate component procurement is feasible and long-term supply is not a constraint.

Compliance Note: The original LP3965EMPX-ADJ is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting compliance with current environmental regulations and industry standards.

Frequently Asked Questions (FAQ)

Q: Can LP3965EMP-ADJ/NOPB be used as a direct replacement for LP3965EMPX-ADJ?

A: Yes. Both parts share identical electrical specifications (1.5A output current, 7V maximum input, 1.216V to 5.1V adjustable output range, 0.55V dropout at 1.5A) and mechanical packaging (SOT-223-5, Surface Mount). The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates lead-free plating on the component leads. This is a manufacturing specification that does not affect electrical performance or functional compatibility. It reflects compliance with lead-free soldering standards.

Q: Why is packaging type (Tape & Reel vs. Cut Tape) important?

A: Packaging type affects handling and assembly processes. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume production. Cut Tape (CT) & Digi-Reel® packaging is suitable for lower-volume or manual assembly operations. Electrical and mechanical compatibility remain unchanged regardless of packaging format.

Q: Is the LP3965EMP-ADJ suitable for new designs?

A: The LP3965EMP-ADJ carries Last Time Buy status, indicating that Texas Instruments has announced end-of-life for this part. While it is functionally equivalent, it is not recommended for new designs due to limited future availability. LP3965EMP-ADJ/NOPB or LP3965EMPX-ADJ/NOPB with Active status are preferred for new applications.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by equivalence in output configuration (Positive), output type (Adjustable), voltage specifications (7V input max, 1.216V to 5.1V output range), current rating (1.5A), dropout voltage (0.55V @ 1.5A), protection features (Over Current, Over Temperature, Short Circuit), operating temperature range (-40°C to 125°C), and physical packaging (SOT-223-5, Surface Mount, TO-261-5/TO-261AB case).

Q: Are there any RoHS compliance considerations?

A: The original LP3965EMPX-ADJ is RoHS non-compliant. All substitute parts (LP3965EMPX-ADJ/NOPB, LP3965EMP-ADJ, LP3965EMP-ADJ/NOPB) are ROHS3 compliant. If your application or supply chain requires RoHS compliance, any of the substitute parts satisfy this requirement.