LP8345CDT-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345CDT-2.5/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output at 500mA in a TO-252-3 surface mount package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The regulator provides over current and over temperature protection suitable for applications requiring stable 2.5V power delivery in compact form factors.

Substiute Parts

LP8345CDT-2.5/NOPB

Texas InstrumentsIn Stock: 923LP8345CDT-2.5/NOPB Datasheet

Current PartRFQ

MCP1825ST-2502E/EB

Microchip TechnologyIn Stock: 1510MCP1825ST-2502E/EB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP8345CDT-2.5/NOPB is determined by the following critical parameters:

• Fixed output voltage of 2.5V
• Output current capability of 500mA minimum
• Surface mount packaging with thermal tab for heat dissipation
• Positive output configuration with fixed regulation
• Protection features including over current and over temperature
• RoHS3 compliance for regulatory alignment

The MCP1825ST-2502E/EB from Microchip Technology meets these core substitution criteria. Both devices deliver identical output voltage and current specifications, operate within compatible temperature ranges, and provide equivalent protection mechanisms. The substitute maintains surface mount form factor with thermal management capability and active product status for long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The MCP1825ST-2502E/EB is the primary substitute for the obsolete LP8345CDT-2.5/NOPB. Both devices are ROHS3 compliant and maintain identical output specifications of 2.5V at 500mA. The substitute offers active product status, ensuring long-term availability and supply chain continuity.

Key considerations for selection:

The MCP1825ST-2502E/EB features lower dropout voltage (0.35V versus 0.65V), reducing power dissipation in applications with limited input voltage headroom. The substitute supports extended operating temperature range (-40°C to 125°C) compared to the original part (0°C to 125°C), enabling deployment in wider environmental conditions. The MCP1825ST-2502E/EB provides superior PSRR performance (60dB at 100Hz versus 55dB at 120Hz) for noise-sensitive applications.

Package differences exist between the original TO-252-3 DPAK and substitute TO-263-4 D2PAK format. Both packages provide thermal tab capability for heat management. PCB layout modifications may be required to accommodate the different pinout and lead configuration of the D2PAK package.

The substitute includes additional protection features (short circuit and under voltage lockout) beyond the original part's over current and over temperature protection, providing enhanced circuit safeguarding.

Frequently Asked Questions (FAQ)

Q: Can the MCP1825ST-2502E/EB directly replace the LP8345CDT-2.5/NOPB without PCB modifications?

A: The output voltage and current specifications are identical, enabling functional substitution. However, package geometry differs between TO-252-3 DPAK and TO-263-4 D2PAK formats. PCB footprint redesign is required to accommodate the different lead spacing and thermal tab position of the D2PAK package.

Q: What are the implications of the lower dropout voltage in the substitute?

A: The MCP1825ST-2502E/EB dropout voltage of 0.35V at 500mA is lower than the original 0.65V specification. This reduces power dissipation and heat generation, improving efficiency in applications with limited input voltage margin. Designs previously constrained by the higher dropout voltage may benefit from improved thermal performance.

Q: Does the extended temperature range of the substitute affect compatibility?

A: The MCP1825ST-2502E/EB operating range of -40°C to 125°C encompasses the original 0°C to 125°C specification. This extended range provides additional design flexibility for applications requiring operation at lower ambient temperatures without introducing compatibility issues for existing designs.

Q: How do the protection features differ between the two parts?

A: The original LP8345CDT-2.5/NOPB provides over current and over temperature protection. The MCP1825ST-2502E/EB adds short circuit and under voltage lockout (UVLO) protection. These additional features enhance circuit robustness without affecting pin-compatible operation.

Q: What is the significance of the different MSL ratings?

A: The LP8345CDT-2.5/NOPB carries MSL 2 (1 Year) rating, while the MCP1825ST-2502E/EB carries MSL 1 (Unlimited). MSL 1 indicates superior moisture resistance and longer shelf life, reducing risk of moisture-induced failures during storage and handling.

Q: Are there quiescent current differences that affect power budget calculations?

A: The MCP1825ST-2502E/EB quiescent current of 220 µA is higher than the original 50 µA specification. In battery-powered or ultra-low-power applications, this difference may impact standby power consumption. Designs with strict quiescent current requirements should evaluate this parameter against application specifications.