LP8345CLD-2.5/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP8345CLD-2.5/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 2.5V output at 500mA. This device is classified as a positive fixed output regulator with integrated over-current and over-temperature protection. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain the core electrical specifications: 2.5V fixed output, 500mA output current capability, and compatible thermal/protection characteristics.

Substiute Parts

LP8345CLD-2.5/NOPB

Texas InstrumentsIn Stock: 4340LP8345CLD-2.5/NOPB Datasheet

Current PartRFQ

BD25KA5FP-E2

Rohm SemiconductorIn Stock: 7094BD25KA5FP-E2 Datasheet

MFR RecommendedRFQ

LD39050PU25R

STMicroelectronicsIn Stock: 16903LD39050PU25R Datasheet

MFR RecommendedRFQ

TC1262-2.5VDB

Microchip TechnologyIn Stock: 4094TC1262-2.5VDB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP8345CLD-2.5/NOPB is determined by the following mandatory parameters:

• Fixed output voltage of 2.5V
• Output current rating of 500mA or greater
• Over-current and over-temperature protection
• Surface mount technology
• ROHS3 compliance or equivalent regulatory status

The three qualified substitute parts meet these core criteria while offering variations in package form factor, input voltage rating, dropout voltage performance, and product status. All substitutes are currently in active production or available inventory, addressing the obsolescence of the original part.

Parameter Comparison

Engineering Selection Recommendations

BD25KA5FP-E2 (Rohm Semiconductor): This substitute is recommended for applications where board space is not constrained and the TO-252 package is acceptable. The part offers the lowest dropout voltage (0.2V @ 200mA) among the substitutes, making it suitable for low-input-voltage applications. However, the maximum input voltage is limited to 5.5V compared to the original 10V specification. The higher quiescent current (550 µA) should be considered in battery-powered designs. Product status is active with full ROHS3 compliance.

LD39050PU25R (STMicroelectronics): This substitute provides the closest electrical match to the original part, with identical quiescent current (50 µA) and matching operating temperature range (0°C ~ 125°C). The 6-DFN package offers a compact footprint similar to the original 6-WSON. Enhanced protection features include short-circuit protection and power-good output. The maximum input voltage is 5.5V. Product status is active with full ROHS3 compliance and unlimited moisture sensitivity rating.

TC1262-2.5VDB (Microchip Technology): This substitute matches the original dropout voltage specification (0.65V @ 500mA) and supports a maximum input voltage of 6V. The SOT-223-3 package is widely available and familiar to design teams. Operating temperature range extends to -40°C, providing broader environmental coverage. Note that this part carries RoHS non-compliant status, which may restrict use in regulated markets or applications with strict environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitutes as a direct replacement for the LP8345CLD-2.5/NOPB?

A: Direct replacement depends on your circuit design and board layout. All three substitutes maintain the 2.5V output and 500mA current specifications. However, package form factors differ (6-WSON vs. TO-252 vs. 6-DFN vs. SOT-223), requiring PCB layout modifications. Input voltage ratings also vary: the original supports 10V maximum, while substitutes are limited to 5.5V or 6V. Verify your input voltage source before selection.

Q: Which substitute has the best performance characteristics?

A: Performance depends on application requirements. The LD39050PU25R offers the lowest quiescent current (50 µA, matching the original) and highest PSRR (65dB), making it ideal for noise-sensitive applications. The BD25KA5FP-E2 provides the lowest dropout voltage (0.2V @ 200mA), beneficial for low-input-voltage systems. The TC1262-2.5VDB matches the original dropout voltage and supports the widest input voltage range among active parts (6V).

Q: What are the package compatibility considerations?

A: The original LP8345CLD-2.5/NOPB uses a 6-WSON package (2.92x3.29mm). The LD39050PU25R uses a similar 6-DFN (3x3mm) package, requiring minimal PCB layout changes. The BD25KA5FP-E2 uses a larger TO-252 package, requiring more board space. The TC1262-2.5VDB uses a SOT-223-3 package, the largest of the three. Thermal performance may vary due to package differences; verify thermal dissipation requirements for your application.

Q: Are there compliance or regulatory differences I should consider?

A: The LD39050PU25R and BD25KA5FP-E2 are ROHS3 compliant, matching the original part's environmental certification. The TC1262-2.5VDB is RoHS non-compliant, which may disqualify it for applications subject to EU environmental regulations or customer-mandated RoHS requirements. All parts carry REACH Unaffected status and EAR99 export classification.

Q: What is the impact of different input voltage ratings?

A: The original part accepts input voltages up to 10V. The BD25KA5FP-E2 and LD39050PU25R limit input to 5.5V, while the TC1262-2.5VDB accepts up to 6V. If your power supply exceeds these limits, additional input protection or voltage regulation may be required. Verify your actual input voltage range before selecting a substitute.

Q: How do quiescent current differences affect my design?

A: The original part and LD39050PU25R both draw 50 µA quiescent current. The BD25KA5FP-E2 draws 550 µA, and the TC1262-2.5VDB draws 130 µA. In battery-powered or low-power standby applications, higher quiescent current increases power consumption. Calculate total system power budget to determine acceptable quiescent current levels for your application.