LP3856ESX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3856ESX-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-263 (DDPAK-5) surface mount package and operates across an input voltage range up to 7V with adjustable output from 1.23V to 6.5V. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

LP3856ESX-ADJ

Texas InstrumentsIn Stock: 825LP3856ESX-ADJ Datasheet

Current PartRFQ

LP3856ESX-ADJ/NOPB

National SemiconductorIn Stock: 1752LP3856ESX-ADJ/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3856ESX-ADJ is determined by strict equivalence across the following critical parameters:

• Output configuration (Positive)
• Output type (Adjustable)
• Number of regulators (1)
• Voltage specifications: Input (Max) 7V, Output range 1.23V to 6.5V
• Current output capacity (3A)
• Dropout voltage (0.6V @ 3A)
• Quiescent current (4 mA)
• Protection features (Over Current, Over Temperature, Short Circuit)
• Operating temperature range (-40°C ~ 125°C)
• Package type (TO-263 DDPAK-5)

The LP3856ESX-ADJ/NOPB qualifies as a parametric equivalent based on complete alignment with all specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The LP3856ESX-ADJ/NOPB serves as the direct parametric equivalent for the obsolete LP3856ESX-ADJ. Both devices share identical electrical specifications and mechanical packaging, enabling direct substitution in existing designs. The primary distinction is product status: the LP3856ESX-ADJ/NOPB maintains active production status, ensuring long-term availability and supply chain continuity. The "/NOPB" suffix indicates lead-free (Pb-free) compliance, aligning with modern manufacturing standards. Both parts carry RoHS non-compliant and REACH Unaffected designations as provided in the specification data.

Frequently Asked Questions (FAQ)

Q: Can the LP3856ESX-ADJ/NOPB be used as a direct replacement for the LP3856ESX-ADJ?

A: Yes. Both devices are electrically and mechanically equivalent across all specified parameters, including output voltage range (1.23V to 6.5V), output current (3A), dropout voltage (0.6V @ 3A), protection features, and TO-263 DDPAK-5 packaging. No circuit modifications are required.

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

A: The "/NOPB" designation indicates the component is manufactured in a lead-free (Pb-free) process, meeting modern environmental and manufacturing compliance requirements.

Q: Are there any package compatibility concerns?

A: No. Both the LP3856ESX-ADJ and LP3856ESX-ADJ/NOPB use identical TO-263-6 (D2PAK with 5 Leads + Tab) packaging, ensuring PCB footprint and thermal interface compatibility.

Q: Why is the original LP3856ESX-ADJ classified as obsolete?

A: Product obsolescence reflects end-of-life status from the original manufacturer. The LP3856ESX-ADJ/NOPB maintains active production, providing a viable path for design continuity and component procurement.

Q: Are the electrical performance characteristics identical?

A: Yes. Both devices deliver identical specifications for quiescent current (4 mA), supply current (10 mA), PSRR (73dB ~ 57dB at 120Hz), and operating temperature range (-40°C ~ 125°C).