LP38855T-1.2 Equivalent & Substitute Parts

Part Overview

The LP38855T-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 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 regulated output.

The main part number LP38855T-1.2 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

LP38855T-1.2

Texas InstrumentsIn Stock: 2122LP38855T-1.2 Datasheet

Current PartRFQ

LP38855T-1.2/NOPB

Texas InstrumentsIn Stock: 961LP38855T-1.2/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP38855T-1.2 is determined by electrical and mechanical parameter alignment within the LP38855 series. The critical substitution criteria are:

• Fixed output voltage of 1.2V
• Output current capability of 1.5A
• Maximum input voltage of 5.5V
• Dropout voltage specification of 0.18V @ 1.5A
• TO-220-5 package configuration
• Identical protection feature set (Over Current, Over Temperature, Short Circuit, UVLO)
• Operating temperature range of -40°C ~ 125°C

The LP38855T-1.2/NOPB variant qualifies as a direct substitute based on matching all electrical specifications and package requirements. The primary distinction is product status and packaging format, not functional performance.

Parameter Comparison

Engineering Selection Recommendations

The LP38855T-1.2/NOPB is the direct functional equivalent of the LP38855T-1.2. Both parts deliver identical electrical performance across all specified parameters. The LP38855T-1.2/NOPB carries Active product status, ensuring ongoing manufacturer support and availability, whereas the original LP38855T-1.2 is classified as Obsolete.

For new designs or production continuity, the LP38855T-1.2/NOPB is the appropriate selection. This variant achieves ROHS3 compliance, meeting current environmental and regulatory requirements, while the original part does not meet RoHS standards. Both parts maintain REACH Unaffected status and carry the same ECCN and HTSUS classifications.

Packaging format differs between the two variants: the original uses formed leads, while the substitute is supplied in tube packaging. This distinction affects handling and automated assembly processes but does not impact electrical or thermal performance.

Frequently Asked Questions (FAQ)

Q: Can LP38855T-1.2/NOPB replace LP38855T-1.2 in existing designs?

A: Yes. The LP38855T-1.2/NOPB is electrically and mechanically identical to the LP38855T-1.2. All output voltage, current, dropout, and protection specifications match exactly. The TO-220-5 package footprint is identical, requiring no PCB modifications.

Q: What is the difference between LP38855T-1.2 and LP38855T-1.2/NOPB?

A: The primary differences are product status and compliance certification. LP38855T-1.2/NOPB is Active and ROHS3 compliant, while LP38855T-1.2 is Obsolete and RoHS non-compliant. Packaging format also differs: formed leads versus tube. Electrical performance is identical.

Q: Why is the original LP38855T-1.2 marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The LP38855T-1.2/NOPB variant remains in active production, providing supply chain continuity and regulatory compliance for current applications.

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

A: No. Both parts operate within the same temperature range (-40°C ~ 125°C), deliver identical quiescent current (300 µA), and provide the same PSRR performance (80dB ~ 65dB across 120Hz ~ 1kHz). Thermal characteristics are equivalent.

Q: Does the packaging format affect circuit performance?

A: No. Tube packaging versus formed leads does not affect electrical or thermal performance. The difference is purely logistical, affecting component handling, storage, and automated assembly processes. The TO-220-5 package footprint remains identical.

Q: Is the LP38855T-1.2/NOPB suitable for new product designs?

A: Yes. The LP38855T-1.2/NOPB is the recommended choice for new designs. It carries Active product status, ROHS3 compliance, and ensures long-term availability and manufacturer support.