LP38853T-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38853T-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-220-7 package and features integrated protection mechanisms including over-current, over-temperature, short-circuit, and under-voltage lockout protection. The main part number is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

LP38853T-ADJ

Texas InstrumentsIn Stock: 880LP38853T-ADJ Datasheet

Current PartRFQ

LP38853T-ADJ/NOPB

Texas InstrumentsIn Stock: 735LP38853T-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP38853T-ADJ is determined by strict equivalence across the following critical parameters:

• Output configuration (Positive)
• Output type (Adjustable)
• Voltage specifications (Input Max: 5.5V, Output Min/Fixed: 0.8V, Output Max: 1.8V)
• Current rating (3A output)
• Voltage dropout performance (0.45V @ 3A)
• Package type (TO-220-7 Formed Leads)
• Control and protection feature set (Enable, Soft Start, Over Current, Over Temperature, Short Circuit, UVLO)
• Operating temperature range (-40°C ~ 125°C)

The LP38853T-ADJ/NOPB variant meets all these criteria and qualifies as a direct substitute. The primary distinction between these part numbers relates to product status and compliance certifications rather than electrical or mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The LP38853T-ADJ/NOPB is the appropriate selection for new designs and production continuity. This variant maintains identical electrical and mechanical specifications to the obsolete LP38853T-ADJ while offering active product status and ROHS3 compliance. The /NOPB designation indicates lead-free construction, aligning with current environmental and regulatory standards. For applications requiring RoHS non-compliant components, the original LP38853T-ADJ remains functionally equivalent where inventory permits, though long-term availability is not assured due to obsolete status.

Frequently Asked Questions (FAQ)

Q: Are LP38853T-ADJ and LP38853T-ADJ/NOPB electrically identical?

A: Yes. Both variants deliver identical electrical performance across all specified parameters including output voltage range (0.8V to 1.8V), output current (3A), dropout voltage (0.45V @ 3A), quiescent current (300 µA), and protection features.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation specifies lead-free (No Lead) construction and ROHS3 compliance. This represents a manufacturing variant rather than a functional change.

Q: Can LP38853T-ADJ/NOPB be used as a direct replacement in existing designs?

A: Yes. The TO-220-7 package, pinout, and all electrical specifications are identical, enabling direct substitution without circuit modification.

Q: Why is the original LP38853T-ADJ listed as obsolete?

A: Product status reflects Texas Instruments' lifecycle management. The LP38853T-ADJ/NOPB variant supersedes the original part, offering improved compliance and ongoing support.

Q: Are there packaging differences between these variants?

A: The main LP38853T-ADJ is supplied in unspecified packaging, while LP38853T-ADJ/NOPB is supplied in Tube packaging. Both use the same TO-220-7 Formed Leads case style.

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

A: Substitution requires matching output configuration (Positive), output type (Adjustable), voltage specifications (5.5V input max, 0.8V to 1.8V output), current rating (3A), dropout voltage (0.45V @ 3A), package type (TO-220-7), and protection feature set (Over Current, Over Temperature, Short Circuit, UVLO).