LP38843T-1.5 Equivalent & Substitute Parts

Part Overview

The LP38843T-1.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 3A output current with a fixed 1.5V output and is housed in a TO-220-5 package for through-hole mounting. The part is classified as obsolete, making identification of active equivalent parts essential for new designs and production continuity. The LP38843T-1.5/NOPB variant provides an active-status alternative with identical electrical and mechanical specifications.

Substiute Parts

LP38843T-1.5

Texas InstrumentsIn Stock: 2013LP38843T-1.5 Datasheet

Current PartRFQ

LP38843T-1.5/NOPB

Texas InstrumentsIn Stock: 1280LP38843T-1.5/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP38843T-1.5 is determined by the following critical parameters:

• Fixed output voltage of 1.5V
• Maximum output current of 3A
• Maximum input voltage of 5.5V
• Maximum dropout voltage of 0.5V @ 3A
• TO-220-5 package configuration
• Through-hole mounting compatibility
• Operating temperature range of -40°C to 125°C
• Positive output configuration with single regulator

The LP38843T-1.5/NOPB meets all these criteria and qualifies as a direct substitute. The primary distinction is product status: the original part is obsolete, while the /NOPB variant maintains active production status with improved RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The LP38843T-1.5/NOPB is the recommended substitute for the obsolete LP38843T-1.5. Both parts share identical electrical performance and mechanical compatibility. The /NOPB variant offers the advantage of active product status and ROHS3 compliance, making it suitable for new designs and applications requiring regulatory adherence. For legacy system maintenance where the original part is required, the LP38843T-1.5 remains available in existing inventory. The packaging difference (Tube for /NOPB versus unspecified for the original) does not affect functional compatibility in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can LP38843T-1.5/NOPB be used as a direct replacement for LP38843T-1.5?

A: Yes. Both parts deliver identical electrical specifications including 1.5V fixed output, 3A maximum current, and 0.5V maximum dropout voltage. The TO-220-5 package and through-hole mounting are identical. The /NOPB variant is the active production equivalent.

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

A: The /NOPB designation indicates "No Lead (Pb)" and reflects RoHS3 compliance. This variant is manufactured to current environmental and regulatory standards, whereas the original LP38843T-1.5 is RoHS non-compliant.

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

A: No. Both parts maintain identical thermal characteristics, quiescent current (30 µA), PSRR performance (80dB ~ 65dB across 120Hz ~ 1kHz), and protection features (Over Current, Over Temperature, Short Circuit).

Q: What is the maximum input voltage for this regulator?

A: The maximum input voltage is 5.5V for both the LP38843T-1.5 and LP38843T-1.5/NOPB.

Q: Is the TO-220-5 package suitable for my application?

A: The TO-220-5 package is a through-hole component designed for PCB mounting with mechanical fastening capability. Verify that your PCB layout accommodates the through-hole footprint and that thermal management requirements are met for 3A continuous operation.