LP8340CLD-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP8340CLD-1.8/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 1.8V output at 1A maximum current in a 6-WSON surface mount package. This device functions as a positive fixed output regulator with integrated over-current and over-temperature protection. The part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and production continuity.

Substiute Parts

LP8340CLD-1.8/NOPB

Texas InstrumentsIn Stock: 1025LP8340CLD-1.8/NOPB Datasheet

Current PartRFQ

LD39100PU18RY

STMicroelectronicsIn Stock: 4492LD39100PU18RY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP8340CLD-1.8/NOPB is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• Output current capability of 1A minimum
• Surface mount package with compatible pinout and thermal characteristics
• Maximum input voltage rating of at least 10V
• Protection against over-current and over-temperature conditions
• RoHS3 compliance for regulatory alignment

The LD39100PU18RY from STMicroelectronics meets these substitution criteria. Both devices deliver 1.8V fixed output at 1A, feature surface mount packaging with exposed pads for thermal management, and include integrated protection circuitry. The LD39100PU18RY is an active product with enhanced specifications and additional control features, making it suitable for replacing the obsolete LP8340CLD-1.8/NOPB in new designs.

Parameter Comparison

Engineering Selection Recommendations

The LD39100PU18RY is the manufacturer-recommended substitute for the obsolete LP8340CLD-1.8/NOPB. Both devices are RoHS3 compliant and deliver identical fixed output voltage and current specifications. The LD39100PU18RY offers superior performance characteristics including lower dropout voltage, reduced quiescent current, and enhanced PSRR. The substitute includes additional control features (Enable, Power Good) and short-circuit protection not present in the original part.

The LD39100PU18RY is an active product with AEC-Q100 automotive qualification, ensuring long-term availability and supply chain stability. The extended operating temperature range (-40°C to 125°C) provides broader application flexibility compared to the original part (0°C to 125°C).

Package dimensions differ slightly between the two devices (6-WSON 2.92x3.29 versus 6-DFN 3x3). PCB layout modifications may be required to accommodate the substitute part. Both packages feature exposed pads for thermal management and are suitable for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can the LD39100PU18RY directly replace the LP8340CLD-1.8/NOPB without circuit modifications?

A: Both devices deliver 1.8V fixed output at 1A with identical output specifications. The LD39100PU18RY includes additional control features (Enable, Power Good) that are not present in the original part. If these pins are not used in the original design, they can be left unconnected. PCB layout changes are necessary due to different package dimensions.

Q: What is the impact of the lower input voltage rating on the LD39100PU18RY?

A: The LD39100PU18RY has a maximum input voltage of 5.5V compared to 10V for the LP8340CLD-1.8/NOPB. Applications requiring input voltages above 5.5V cannot use the LD39100PU18RY as a direct substitute. Verify your input voltage requirements before selection.

Q: Are there differences in thermal performance between these devices?

A: The LD39100PU18RY exhibits significantly lower dropout voltage (0.4V @ 1A versus 1.4V @ 800mA), resulting in reduced power dissipation and improved thermal performance. Both packages include exposed pads for thermal management.

Q: What is the significance of the AEC-Q100 qualification on the LD39100PU18RY?

A: AEC-Q100 qualification indicates the device meets automotive industry reliability and quality standards. This certification ensures consistent performance across temperature and environmental conditions, providing confidence for automotive and mission-critical applications.

Q: How do the package dimensions affect PCB design?

A: The LP8340CLD-1.8/NOPB uses a 6-WSON package (2.92x3.29mm), while the LD39100PU18RY uses a 6-DFN package (3x3mm). The footprints are not identical, requiring PCB layout modifications. Verify pinout compatibility and ensure adequate spacing for the substitute package before implementation.