LP38855S-1.2 Equivalent & Substitute Parts

Part Overview

The LP38855S-1.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 1.5A output current at a fixed 1.2V output with a maximum dropout voltage of 0.18V at full load. The part integrates protection features including over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO) protection, making it suitable for low-voltage power supply applications requiring stable regulation and thermal management.

The main part number LP38855S-1.2 carries a Last Time Buy product status, indicating limited availability. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for ongoing production and maintenance applications.

Substiute Parts

LP38855S-1.2

Texas InstrumentsIn Stock: 1259LP38855S-1.2 Datasheet

Current PartRFQ

LP38855S-1.2/NOPB

Texas InstrumentsIn Stock: 1760LP38855S-1.2/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP38855S-1.2 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 1.2V
• Output current rating of 1.5A
• Maximum input voltage of 5.5V
• Dropout voltage specification of 0.18V @ 1.5A
• Quiescent current of 300 µA
• PSRR performance of 80dB ~ 65dB (120Hz ~ 1kHz)
• Operating temperature range of -40°C ~ 125°C
• Package configuration: TO-263 (DDPAK-5)
• Integrated protection features: Over Current, Over Temperature, Short Circuit, UVLO
• Enable control feature

Only parts meeting all these electrical and mechanical specifications qualify as direct substitutes. The LP38855S-1.2/NOPB variant is classified as a direct manufacturer equivalent based on identical parameter specifications.

Parameter Comparison

Engineering Selection Recommendations

The LP38855S-1.2/NOPB is a direct functional equivalent to the LP38855S-1.2. Both parts are manufactured by Texas Instruments and share identical electrical specifications and package configurations. The primary distinction is product lifecycle status: LP38855S-1.2 is designated Last Time Buy, while LP38855S-1.2/NOPB maintains Active status.

For new designs and ongoing production requiring long-term supply assurance, the LP38855S-1.2/NOPB is the preferred selection. Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can LP38855S-1.2/NOPB be used as a direct replacement for LP38855S-1.2?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free plating and represents a manufacturing variant of the same base product (LP38855). All electrical parameters, output specifications, protection features, and package configurations are equivalent.

Q: What does the Last Time Buy status mean for LP38855S-1.2?

A: Last Time Buy indicates that Texas Instruments will no longer manufacture this part after a specified cutoff date. Existing inventory may be available, but future production is not guaranteed. The LP38855S-1.2/NOPB, with Active status, ensures continued availability for future orders.

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

A: No. Both parts use the TO-263 (DDPAK-5) package configuration with identical pinout and mechanical dimensions. They are pin-for-pin compatible and require no PCB layout modifications for substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both LP38855S-1.2 and LP38855S-1.2/NOPB are ROHS3 compliant and REACH Unaffected, meeting the same regulatory requirements for environmental and hazardous substance restrictions.

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

A: The /NOPB suffix indicates "No Plumbum" (lead-free) plating on the component leads. This is a manufacturing specification that does not affect electrical performance or functionality. It reflects compliance with lead-free soldering standards.