LP38690DT-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38690DT-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output at 1A current capacity in a TO-252-3 surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design requirements and production needs. The device provides regulated power management in applications requiring stable 2.5V rails with moderate current draw.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1A
Input Voltage (Max)	10V
Voltage Dropout (Max)	1.3V @ 1A
Quiescent Current	55 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-252-3 (DPAK)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LP38690DT-2.5 are qualified based on the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 1A minimum
TO-252-3 package compatibility for direct PCB footprint replacement
Surface mount technology
Operating temperature range support for -40°C to 125°C applications
Positive output configuration

Parts meeting these core electrical and mechanical criteria are considered functionally equivalent for direct substitution in existing designs.

Parameter Comparison

Parameter	LP38690DT-2.5	LP38690DT-2.5/NOPB	BA25BC0FP-E2
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor
Output Voltage	2.5V	2.5V	2.5V
Output Current	1A	1A	1A
Input Voltage (Max)	10V	10V	16V
Voltage Dropout (Max)	1.3V @ 1A	1.3V @ 1A	Not specified
Quiescent Current	55 µA	55 µA	0.5 mA
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
Product Status	Discontinued	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Protection Features	Over Temperature	Over Temperature	Over Current, Over Temperature

Engineering Selection Recommendations

LP38690DT-2.5/NOPB is the direct equivalent from Texas Instruments. This part maintains identical electrical specifications and package configuration as the original LP38690DT-2.5. The primary difference is product status: LP38690DT-2.5/NOPB is active and available, while the original is discontinued. This part is ROHS3 compliant and represents the recommended path for continued use of the Texas Instruments LP38690 series.

BA25BC0FP-E2 from Rohm Semiconductor is a functional substitute meeting all core substitution criteria. Key considerations for this alternative include: higher maximum input voltage rating (16V versus 10V), higher quiescent current (0.5 mA versus 55 µA), and a reduced maximum operating temperature of 105°C versus 125°C. The BA25BC0FP-E2 includes over-current protection in addition to over-temperature protection. This part is ROHS3 compliant and has significantly higher inventory availability.

Selection between these substitutes depends on application requirements: use LP38690DT-2.5/NOPB for direct Texas Instruments continuity; use BA25BC0FP-E2 when higher input voltage tolerance or over-current protection is beneficial and the 105°C maximum operating temperature is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LP38690DT-2.5/NOPB replace LP38690DT-2.5 directly?

A: Yes. LP38690DT-2.5/NOPB is the active production equivalent with identical electrical specifications, output voltage, current rating, and TO-252-3 package. The only differences are product status and RoHS compliance level.

Q: What are the key differences between LP38690DT-2.5/NOPB and BA25BC0FP-E2?

A: Both provide 2.5V at 1A output in TO-252-3 packages. LP38690DT-2.5/NOPB has lower quiescent current (55 µA vs 0.5 mA), lower maximum input voltage (10V vs 16V), and higher maximum operating temperature (125°C vs 105°C). BA25BC0FP-E2 adds over-current protection and supports higher input voltages.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-252-3 (DPAK) package with identical pinout, enabling direct PCB footprint replacement without layout modifications.

Q: Which substitute should I choose for new designs?

A: For new designs, LP38690DT-2.5/NOPB is recommended as the primary choice due to identical specifications and active status. BA25BC0FP-E2 is suitable when higher input voltage capability or over-current protection is required and the 105°C temperature limit is acceptable.

Q: Are there RoHS compliance considerations?

A: LP38690DT-2.5 is RoHS non-compliant. Both LP38690DT-2.5/NOPB and BA25BC0FP-E2 are ROHS3 compliant, making them suitable for applications with RoHS requirements.

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

A: The BA25BC0FP-E2 quiescent current of 0.5 mA is approximately 9 times higher than the 55 µA of LP38690DT-2.5/NOPB. This affects standby power consumption and may be significant in battery-powered or low-power applications.

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