LP38843S-1.2 Equivalent & Substitute Parts

Part Overview

The LP38843S-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.2V at 3A in a TO-263 (DDPAK-5) surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP38843S-1.2 is currently marked as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. Active alternatives with matching or superior electrical characteristics are available from multiple manufacturers.

Substiute Parts

LP38843S-1.2

Texas InstrumentsIn Stock: 5913LP38843S-1.2 Datasheet

Current PartRFQ

LP38843S-1.2/NOPB

Texas InstrumentsIn Stock: 1265LP38843S-1.2/NOPB Datasheet

DirectRFQ

LP3883ES-1.2/NOPB

National SemiconductorIn Stock: 2117LP3883ES-1.2/NOPB Datasheet

Parametric EquivalentRFQ

MIC59300-1.2WU

Microchip TechnologyIn Stock: 1401MIC59300-1.2WU Datasheet

MFR RecommendedRFQ

LP3883ES-1.2

Texas InstrumentsIn Stock: 5304LP3883ES-1.2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP38843S-1.2 are classified based on the following substitution criteria:

Direct Manufacturer Equivalent: Parts with identical electrical specifications, same package type, and matching output voltage and current ratings from the original manufacturer.

Parametric Equivalent: Parts from alternative manufacturers meeting or exceeding the core electrical parameters (output voltage, output current, input voltage range, dropout voltage, operating temperature range, and protection features) while maintaining package compatibility.

Key Parameters for Substitution:

• Fixed output voltage: 1.2V
• Output current capability: 3A minimum
• Input voltage tolerance: 5.5V maximum
• Package: TO-263-6 (D2PAK-5)
• Protection: Over Current, Over Temperature, Short Circuit
• Control: Enable feature required

Parameter Comparison

Engineering Selection Recommendations

LP38843S-1.2/NOPB (Texas Instruments): This is the direct equivalent with active product status. It maintains identical electrical specifications and package configuration as the obsolete LP38843S-1.2. The primary distinction is RoHS3 compliance and lead-free packaging (NOPB designation). This part is the preferred direct replacement for new designs and existing inventory transitions.

LP3883ES-1.2 (Texas Instruments): This parametric equivalent offers improved performance characteristics, including reduced dropout voltage (0.42V vs. 0.5V) and lower supply current (8 mA vs. 40 mA). However, the product status is Last Time Buy, indicating limited future availability. This part is suitable for applications where superior efficiency is required, with the understanding that long-term procurement may be constrained.

LP3883ES-1.2/NOPB (National Semiconductor): This parametric equivalent from National Semiconductor provides identical electrical performance to the LP3883ES-1.2 variant with active product status and RoHS3 compliance. It delivers the same improved dropout voltage and supply current characteristics. This part offers long-term availability assurance.

MIC59300-1.2WU (Microchip Technology): This manufacturer-recommended alternative meets core substitution criteria with active product status and RoHS3 compliance. The maximum input voltage is limited to 3.8V compared to 5.5V for other alternatives. This constraint requires verification against specific application input voltage requirements. Short circuit protection is included; however, the datasheet does not specify quiescent current values. This part is suitable for applications with input voltage constraints below 3.8V.

Frequently Asked Questions (FAQ)

Q: Can LP38843S-1.2/NOPB be used as a direct replacement for LP38843S-1.2?

A: Yes. LP38843S-1.2/NOPB is the direct equivalent with identical electrical specifications, output voltage, output current, and package configuration. The primary differences are RoHS3 compliance and lead-free processing. No circuit modifications are required.

Q: What is the difference between LP3883ES-1.2 and LP38843S-1.2?

A: Both deliver 1.2V at 3A in the same TO-263 package. The LP3883ES-1.2 offers superior performance with lower dropout voltage (0.42V vs. 0.5V) and reduced supply current (8 mA vs. 40 mA). The LP3883ES-1.2 product status is Last Time Buy, indicating limited future availability.

Q: Is MIC59300-1.2WU compatible with all applications using LP38843S-1.2?

A: MIC59300-1.2WU is compatible for applications where the input voltage does not exceed 3.8V. The original LP38843S-1.2 supports input voltages up to 5.5V. Verify application input voltage requirements before selection. All other electrical parameters and package compatibility are maintained.

Q: What does RoHS3 compliance mean for these parts?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting specific hazardous materials. LP38843S-1.2/NOPB, LP3883ES-1.2/NOPB, LP3883ES-1.2, and MIC59300-1.2WU are all RoHS3 compliant. The original LP38843S-1.2 is non-compliant and should be phased out in new designs.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts use the identical TO-263-6 (D2PAK-5) package with the same pinout and thermal tab configuration. No PCB modifications are required for substitution.

Q: Which substitute part offers the best long-term availability?

A: LP38843S-1.2/NOPB and MIC59300-1.2WU both have active product status, indicating ongoing manufacturing and availability. LP3883ES-1.2/NOPB also has active status. LP3883ES-1.2 is marked Last Time Buy and should be avoided for new designs requiring long-term support.