LP8345CDTX-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345CDTX-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 500mA in a TO-252-3 surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support, legacy system maintenance, and production continuity.

Substiute Parts

LP8345CDTX-3.3/NOPB

Texas InstrumentsIn Stock: 878LP8345CDTX-3.3/NOPB Datasheet

Current PartRFQ

MIC5237-3.3YU

Microchip TechnologyIn Stock: 4039MIC5237-3.3YU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP8345CDTX-3.3/NOPB is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 500mA minimum
• Surface mount technology with compatible package footprint
• Maximum input voltage rating of 10V or greater
• Voltage dropout specification suitable for the application
• Protection features including over-current and over-temperature
• RoHS3 compliance and equivalent regulatory status

The MIC5237-3.3YU from Microchip Technology meets these substitution criteria. While it uses a different package designation (TO-263-3 versus TO-252-3), both packages are surface mount configurations with similar thermal and electrical characteristics suitable for equivalent circuit board integration.

Parameter Comparison

Engineering Selection Recommendations

The MIC5237-3.3YU is the designated manufacturer-recommended substitute for the LP8345CDTX-3.3/NOPB. Selection of this alternative is supported by:

• Active product status, ensuring long-term availability and supply chain continuity
• Identical fixed output voltage (3.3V) and output current rating (500mA)
• Higher maximum input voltage rating (16V versus 10V), providing greater design margin
• Enhanced PSRR performance (75dB versus 55dB at 120Hz)
• Additional reverse polarity protection feature
• ROHS3 compliance matching the original part
• Extended operating temperature range (-40°C to 125°C versus 0°C to 125°C)

Package transition from TO-252-3 (DPAK) to TO-263-3 (D2PAK) requires PCB layout modification. Both packages are industry-standard surface mount configurations with equivalent thermal performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the MIC5237-3.3YU be used as a direct pin-for-pin replacement?

A: No. While both devices are 3-lead surface mount packages, the TO-252-3 (DPAK) and TO-263-3 (D2PAK) have different footprints. PCB layout redesign is required for package transition.

Q: What is the impact of the higher input voltage rating on the MIC5237-3.3YU?

A: The MIC5237-3.3YU accepts input voltages up to 16V compared to 10V for the LP8345CDTX-3.3/NOPB. This provides additional design flexibility and protection against input voltage transients without affecting 3.3V output performance.

Q: How does the voltage dropout difference affect circuit design?

A: The LP8345CDTX-3.3/NOPB has a maximum dropout of 0.5V at 500mA, while the MIC5237-3.3YU has 0.7V at 500mA. For applications with tight input voltage margins, the lower dropout of the original part may be preferable, but the MIC5237-3.3YU remains suitable for most standard 3.3V regulation applications.

Q: Are there thermal considerations when switching packages?

A: Both TO-252-3 and TO-263-3 packages are designed for similar thermal dissipation in surface mount applications. Verify thermal pad connection and PCB copper area in your specific layout to ensure adequate heat transfer for 500mA continuous operation.

Q: Does the MIC5237-3.3YU reverse polarity protection affect circuit operation?

A: No. Reverse polarity protection is a passive safety feature that does not impact normal circuit operation when input polarity is correct.

Q: Are both parts RoHS compliant?

A: Yes. Both the LP8345CDTX-3.3/NOPB and MIC5237-3.3YU are ROHS3 compliant and REACH unaffected.