LP3856ET-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3856ET-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 3A output current in a TO-220-5 package and features adjustable output voltage ranging from 1.23V to 6.5V. The main part number is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and procurement planning.

Substiute Parts

LP3856ET-ADJ

Texas InstrumentsIn Stock: 2526LP3856ET-ADJ Datasheet

Current PartRFQ

LP3856ET-ADJ/NOPB

Texas InstrumentsIn Stock: 1090LP3856ET-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3856ET-ADJ is determined by the following critical parameters:

• Output configuration (Positive)
• Output type (Adjustable)
• Output current rating (3A)
• Voltage range capability (1.23V to 6.5V output)
• Input voltage maximum (7V)
• Package type (TO-220-5 Formed Leads)
• Mounting method (Through Hole)
• Protection features (Over Current, Over Temperature, Short Circuit)

The LP3856ET-ADJ/NOPB qualifies as a direct substitute because it maintains identical electrical specifications and mechanical compatibility across all these parameters.

Parameter Comparison

Engineering Selection Recommendations

The LP3856ET-ADJ/NOPB is the appropriate substitute for the obsolete LP3856ET-ADJ. Both parts share identical electrical and mechanical specifications, ensuring direct functional compatibility in existing circuit designs.

The primary distinction between these part numbers is product status and regulatory compliance. The LP3856ET-ADJ/NOPB carries Active status from Texas Instruments, ensuring continued availability and manufacturing support. Additionally, the LP3856ET-ADJ/NOPB meets ROHS3 compliance requirements, whereas the original part is RoHS non-compliant. This compliance difference may be relevant for applications subject to environmental regulations or customer specifications requiring RoHS certification.

The /NOPB suffix indicates lead-free plating, which is standard for current production. Both parts maintain identical TO-220-5 package geometry and through-hole mounting characteristics, allowing direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can LP3856ET-ADJ/NOPB be used as a direct replacement for LP3856ET-ADJ?

A: Yes. Both parts deliver identical electrical performance and mechanical compatibility. The LP3856ET-ADJ/NOPB is the active production equivalent and is suitable for direct substitution in all applications where the original part was specified.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation indicates lead-free plating on the component leads. This is standard for current Texas Instruments production and reflects modern manufacturing practices.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use the TO-220-5 Formed Leads package with through-hole mounting. PCB layouts and thermal management designs require no modification.

Q: Why is the original LP3856ET-ADJ listed as obsolete?

A: The LP3856ET-ADJ has been superseded by the LP3856ET-ADJ/NOPB in Texas Instruments' product portfolio. The newer variant incorporates lead-free manufacturing and maintains full backward compatibility.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical specifications. Both parts deliver identical voltage regulation, current output, and thermal performance.

Q: Can these parts be used interchangeably in new designs?

A: Yes. The LP3856ET-ADJ/NOPB is recommended for new designs due to its active product status and regulatory compliance. Existing designs using the obsolete part can transition to the LP3856ET-ADJ/NOPB without circuit modifications.