LP8340CDT-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP8340CDT-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 1A current capacity in a TO-252-3 surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support, production continuity, and component sourcing.

Substiute Parts

LP8340CDT-1.8/NOPB

Texas InstrumentsIn Stock: 779LP8340CDT-1.8/NOPB Datasheet

Current PartRFQ

LT1965EMS8E-1.8#PBF

Analog Devices Inc.In Stock: 18159LT1965EMS8E-1.8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP8340CDT-1.8/NOPB is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• Minimum output current capability of 1A or greater
• Maximum input voltage rating of 10V or higher
• Surface mount packaging with compatible pinout and thermal characteristics
• Over current and over temperature protection features
• RoHS3 compliance for regulatory alignment

The LT1965EMS8E-1.8#PBF meets these substitution criteria through equivalent output voltage specification, higher output current rating (1.1A), superior input voltage rating (20V), and enhanced protection features including reverse polarity protection.

Parameter Comparison

Engineering Selection Recommendations

The LT1965EMS8E-1.8#PBF is the designated manufacturer-recommended substitute for the LP8340CDT-1.8/NOPB. Both devices maintain ROHS3 compliance and equivalent regulatory status under REACH and EAR99 classifications.

The substitute part offers superior electrical performance characteristics including lower dropout voltage, higher input voltage tolerance, and extended temperature range operation. The package transition from TO-252-3 to 8-MSOP-EP requires PCB layout modification and thermal management reassessment due to different package geometries and thermal dissipation characteristics.

Both devices are active in inventory with established supply chains, supporting long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can the LT1965EMS8E-1.8#PBF directly replace the LP8340CDT-1.8/NOPB without circuit modification?

A: Functional substitution is possible based on electrical specifications. However, package geometry differs (TO-252-3 versus 8-MSOP-EP), requiring PCB layout redesign. Pin configuration and thermal pad placement must be verified against datasheet specifications before implementation.

Q: What are the key advantages of the LT1965EMS8E-1.8#PBF substitute?

A: The substitute provides lower dropout voltage (0.49V versus 1.4V), higher input voltage rating (20V versus 10V), extended operating temperature range (-40°C to 125°C versus 0°C to 125°C), and additional reverse polarity protection. These characteristics improve system efficiency and reliability margins.

Q: Are both parts RoHS compliant?

A: Yes, both the LP8340CDT-1.8/NOPB and LT1965EMS8E-1.8#PBF are ROHS3 compliant with MSL rating of 1 (Unlimited), supporting equivalent environmental and regulatory requirements.

Q: What is the impact of the package change on thermal performance?

A: The 8-MSOP-EP package has different thermal characteristics compared to TO-252-3 (DPAK). Thermal resistance and heat dissipation paths differ, requiring thermal analysis and potentially modified PCB copper area allocation for equivalent thermal performance.

Q: Is the substitute part currently available?

A: Yes, the LT1965EMS8E-1.8#PBF is an active product with 18,129 pieces in stock, ensuring supply continuity and long-term availability compared to the obsolete LP8340CDT-1.8/NOPB.