LP8345CLDX-2.5/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP8345CLDX-2.5/NOPB is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 2.5V output at 500mA with a maximum dropout voltage of 0.65V. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs, production continuity, and long-term component sourcing strategies. The regulator features integrated over-current and over-temperature protection, operating across a 0°C to 125°C temperature range in a compact 6-WSON surface-mount package.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	500mA
Maximum Input Voltage	10V
Dropout Voltage (Max)	0.65V @ 500mA
Quiescent Current	50 µA
PSRR	55dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C ~ 125°C
Package Type	6-WSON (2.92x3.29)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP8345CLDX-2.5/NOPB is determined by the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 500mA minimum
Maximum input voltage rating of 5.5V or higher
Dropout voltage performance suitable for the application
Surface-mount packaging with compatible footprint or pinout
Protection features including over-current and over-temperature
RoHS3 compliance status

Three active substitute parts meet these criteria across different package types and manufacturers, each offering distinct advantages in thermal performance, quiescent current, and additional control features.

Parameter Comparison

Parameter	LP8345CLDX-2.5/NOPB (Main)	BD25KA5FP-E2	LD39050PU25R	TC1262-2.5VDB
Manufacturer	Texas Instruments	Rohm Semiconductor	STMicroelectronics	Microchip Technology
Output Voltage	2.5V	2.5V	2.5V	2.5V
Output Current	500mA	500mA	500mA	500mA
Max Input Voltage	10V	5.5V	5.5V	6V
Dropout Voltage (Max)	0.65V @ 500mA	0.2V @ 200mA	0.4V @ 500mA	0.65V @ 500mA
Quiescent Current	50 µA	550 µA	50 µA	130 µA
PSRR	55dB (120Hz)	50dB (120Hz)	65dB ~ 62dB (1kHz ~ 10kHz)	64dB (1kHz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Soft Start	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	6-WSON (2.92x3.29)	TO-252-3 (DPAK)	6-DFN (3x3)	SOT-223-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

BD25KA5FP-E2 (Rohm Semiconductor): This substitute offers the lowest dropout voltage at 0.2V @ 200mA and includes soft-start protection. It is ROHS3 compliant and actively manufactured. The TO-252 package provides superior thermal dissipation compared to the original 6-WSON package. However, the maximum input voltage is limited to 5.5V, and quiescent current is elevated at 550 µA. This part is suitable for applications where thermal performance and low dropout are prioritized and input voltage does not exceed 5.5V.

LD39050PU25R (STMicroelectronics): This substitute maintains the original 50 µA quiescent current and provides the highest PSRR at 65dB ~ 62dB across the 1kHz to 10kHz range. It includes short-circuit protection in addition to over-current and over-temperature protection. The 6-DFN package is compact and similar in footprint to the original 6-WSON. It is ROHS3 compliant and actively produced. Operating temperature extends to -40°C, providing broader environmental coverage. This part is recommended for noise-sensitive applications and designs requiring extended low-temperature operation.

TC1262-2.5VDB (Microchip Technology): This substitute matches the original dropout voltage specification at 0.65V @ 500mA and maintains compatibility with the original electrical performance envelope. The SOT-223-3 package is widely available and offers good thermal characteristics. However, this part is RoHS non-compliant, which may restrict use in regulated markets or applications with RoHS requirements. Operating temperature range extends to -40°C. This part is suitable only for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can I use BD25KA5FP-E2 as a direct replacement for LP8345CLDX-2.5/NOPB?

A: BD25KA5FP-E2 is functionally equivalent for 2.5V, 500mA applications. However, the maximum input voltage is reduced from 10V to 5.5V, and the package changes from 6-WSON to TO-252. Verify that your input voltage does not exceed 5.5V and that the TO-252 footprint is compatible with your PCB layout before substitution.

Q: Which substitute has the best noise performance?

A: LD39050PU25R provides the highest PSRR at 65dB ~ 62dB (1kHz ~ 10kHz), making it the best choice for applications requiring superior power supply rejection and low-noise output.

Q: Is TC1262-2.5VDB suitable for new designs?

A: TC1262-2.5VDB is not recommended for new designs due to its RoHS non-compliant status. Use LD39050PU25R or BD25KA5FP-E2 for new production to ensure regulatory compliance.

Q: What are the package footprint differences?

A: The original LP8345CLDX-2.5/NOPB uses a 6-WSON package (2.92x3.29mm). Substitutes use different packages: BD25KA5FP-E2 uses TO-252 (larger, better thermal), LD39050PU25R uses 6-DFN (similar size, compact), and TC1262-2.5VDB uses SOT-223-3 (small outline). PCB layout modifications are required for all substitutions.

Q: Which substitute has the lowest quiescent current?

A: Both LP8345CLDX-2.5/NOPB and LD39050PU25R share the same 50 µA quiescent current specification, making LD39050PU25R the best low-power alternative. BD25KA5FP-E2 has significantly higher quiescent current at 550 µA.

Q: Can I use these substitutes in applications with input voltages above 5.5V?

A: BD25KA5FP-E2 and LD39050PU25R are limited to 5.5V maximum input. TC1262-2.5VDB supports up to 6V input. For applications requiring the original 10V input capability, no direct substitute from this list is available; alternative regulators with higher input voltage ratings must be evaluated.

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