LP38690DTX-2.5 Equivalent & Substitute Parts

Part Overview

The LP38690DTX-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.5V at 1A with a maximum dropout voltage of 1.3V at rated current. The device is housed in a TO-252-3 (DPAK) surface mount package and operates across the industrial temperature range of -40°C to 125°C.

This part is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1A
Input Voltage (Max)	10V
Dropout Voltage (Max)	1.3V @ 1A
Quiescent Current	55 µA
PSRR	55dB (120Hz)
Operating Temperature Range	-40°C to 125°C
Package	TO-252-3 (DPAK)
Protection Features	Over Temperature

Substitute Part Grouping Explanation

Substitute parts for the LP38690DTX-2.5 are identified based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 2.5V
Output current capability of 1A
Surface mount TO-252-3 package compatibility
Operating temperature range support
Input voltage tolerance
Dropout voltage performance
Protection feature set

Two substitute parts meet these criteria with varying degrees of parameter alignment:

LP38690DTX-2.5/NOPB (National Semiconductor): Parametric equivalent with identical electrical specifications and package configuration. Product status is active.

BA25BC0FP-E2 (Rohm Semiconductor): Manufacturer-recommended alternative with compatible output voltage and current ratings, same package type, and active product status. Notable parameter differences exist in input voltage rating, quiescent current, and protection features.

Parameter Comparison

Parameter	LP38690DTX-2.5 (TI)	LP38690DTX-2.5/NOPB (NSC)	BA25BC0FP-E2 (Rohm)
Manufacturer	Texas Instruments	National Semiconductor	Rohm Semiconductor
Output Voltage	2.5V	2.5V	2.5V
Output Current	1A	1A	1A
Input Voltage (Max)	10V	10V	16V
Dropout Voltage (Max)	1.3V @ 1A	1.3V @ 1A	Not specified
Quiescent Current	55 µA	55 µA	0.5 mA
PSRR	55dB (120Hz)	55dB (120Hz)	Not specified
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 105°C
Package	TO-252-3	TO-252-3	TO-252-3
Protection Features	Over Temperature	Over Temperature	Over Current, Over Temperature
Product Status	Obsolete	Active	Active
RoHS Compliance	Non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LP38690DTX-2.5/NOPB is the primary parametric equivalent. It maintains identical electrical specifications, identical package configuration, and identical operating temperature range. Product status is active, ensuring continued availability. This part provides direct functional replacement with no design modifications required.

BA25BC0FP-E2 is a manufacturer-recommended alternative suitable for applications where the following conditions are met: input voltage does not exceed 16V, operating temperature does not exceed 105°C, and higher quiescent current (0.5 mA versus 55 µA) is acceptable. This part offers enhanced protection features (over current in addition to over temperature) and RoHS3 compliance. The unspecified dropout voltage and PSRR require evaluation against application requirements.

For designs requiring strict parameter matching and maximum supply chain continuity, LP38690DTX-2.5/NOPB is the recommended selection. For new designs or applications with relaxed temperature or quiescent current requirements, BA25BC0FP-E2 offers compliance advantages and enhanced protection.

Frequently Asked Questions (FAQ)

Q: Can LP38690DTX-2.5/NOPB be used as a direct replacement for LP38690DTX-2.5?

A: Yes. Both parts share identical output voltage (2.5V), output current (1A), dropout voltage (1.3V @ 1A), quiescent current (55 µA), PSRR (55dB at 120Hz), operating temperature range (-40°C to 125°C), and TO-252-3 package. No circuit modifications are required.

Q: What are the key differences between BA25BC0FP-E2 and the original LP38690DTX-2.5?

A: BA25BC0FP-E2 has a higher maximum input voltage (16V versus 10V), higher quiescent current (0.5 mA versus 55 µA), lower maximum operating temperature (105°C versus 125°C), and includes over current protection in addition to over temperature protection. Dropout voltage and PSRR are not specified for the Rohm part.

Q: Is the TO-252-3 package identical across all three parts?

A: Yes. All three parts use the TO-252-3 (DPAK with 2 leads plus tab) surface mount package, designated as SC-63. PCB layout and thermal management considerations remain unchanged.

Q: Which substitute part should be selected for a new design?

A: For new designs, BA25BC0FP-E2 is preferred due to active product status, RoHS3 compliance, and enhanced protection features. Verify that the application input voltage does not exceed 16V and that the maximum operating temperature requirement does not exceed 105°C.

Q: Are there compliance or regulatory differences between these parts?

A: The original LP38690DTX-2.5 is RoHS non-compliant. LP38690DTX-2.5/NOPB compliance status is not specified. BA25BC0FP-E2 is RoHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the impact of higher quiescent current in BA25BC0FP-E2?

A: BA25BC0FP-E2 draws 0.5 mA quiescent current compared to 55 µA for the other two parts. In battery-powered or low-power standby applications, this represents a 9x increase in idle current draw. Evaluate power budget impact before selection.

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