LP38858T-1.2 Equivalent & Substitute Parts

Part Overview

The LP38858T-1.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 1.5A output current at a fixed 1.2V output with a maximum dropout voltage of 0.18V at full load. The device integrates soft start control and comprehensive protection features including over-current, over-temperature, short-circuit, and under-voltage lockout protection. The part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support.

Substiute Parts

LP38858T-1.2

Texas InstrumentsIn Stock: 1146LP38858T-1.2 Datasheet

Current PartRFQ

LP38858T-1.2/NOPB

Texas InstrumentsIn Stock: 1296LP38858T-1.2/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP38858T-1.2 is determined by strict equivalence across the following critical parameters:

• Output voltage specification: 1.2V fixed
• Maximum output current: 1.5A
• Maximum input voltage: 5.5V
• Maximum dropout voltage: 0.18V @ 1.5A
• Package type: TO-220-5 Formed Leads
• Mounting configuration: Through Hole
• Operating temperature range: -40°C ~ 125°C
• Protection features: Over-current, over-temperature, short-circuit, under-voltage lockout
• Control features: Soft start

The LP38858T-1.2/NOPB is a direct equivalent manufactured by Texas Instruments with identical electrical specifications and mechanical packaging. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LP38858T-1.2/NOPB is the direct active equivalent for the obsolete LP38858T-1.2. Both parts share identical electrical performance specifications and mechanical compatibility. The LP38858T-1.2/NOPB offers the advantage of active product status, ensuring continued availability and manufacturing support. Additionally, the LP38858T-1.2/NOPB meets ROHS3 compliance requirements, whereas the original part is RoHS non-compliant. For new designs and production continuity, the LP38858T-1.2/NOPB is the appropriate selection. Both parts maintain equivalent thermal performance and protection feature sets across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the LP38858T-1.2/NOPB be used as a direct replacement for the LP38858T-1.2?

A: Yes. Both parts deliver identical electrical specifications including 1.2V fixed output, 1.5A maximum output current, 0.18V maximum dropout voltage, and equivalent protection features. The TO-220-5 package and through-hole mounting configuration are identical, enabling direct PCB compatibility.

Q: What is the difference between LP38858T-1.2 and LP38858T-1.2/NOPB?

A: The primary differences are product status and compliance certification. The LP38858T-1.2 is obsolete and RoHS non-compliant. The LP38858T-1.2/NOPB is active, ROHS3 compliant, and supplied in tube packaging. Electrical and thermal performance are equivalent.

Q: Why is the original LP38858T-1.2 listed as obsolete?

A: Product obsolescence reflects Texas Instruments' discontinuation of this part number. The LP38858T-1.2/NOPB represents the active continuation with equivalent functionality and improved compliance status.

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

A: No. Both parts operate across the same temperature range (-40°C to 125°C), deliver identical quiescent current (8.5 mA), and provide equivalent PSRR performance (80dB ~ 65dB across 120Hz ~ 1kHz).

Q: What packaging considerations apply to substitution?

A: Both parts use TO-220-5 formed leads with through-hole mounting. The LP38858T-1.2/NOPB is supplied in tube packaging, whereas the original part number does not specify packaging type. This does not affect PCB layout or thermal performance.