LP3882ESX-1.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3882ESX-1.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.5V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The device provides regulated 1.5V output with integrated protection features including over-current, over-temperature, and under-voltage lockout (UVLO) protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.5V
Output Current	1.5A
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.27V @ 1.5A
Quiescent Current	30 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, UVLO

Substitute Part Grouping Explanation

Substitution for the LP3882ESX-1.5 is determined by the following critical parameters: fixed output voltage of 1.5V, output current capability of 1.5A, maximum input voltage of 5.5V, TO-263 package compatibility, and integrated protection features (over-current, over-temperature, and UVLO). All substitute parts must maintain identical output voltage and current ratings, operate within the same input voltage range, use the same package footprint, and provide equivalent protection functionality. Variations in dropout voltage, quiescent current, and supply current are acceptable within the constraints of the application, provided the core electrical specifications remain compatible.

Parameter Comparison

Parameter	LP3882ESX-1.5	LP3882ESX-1.5/NOPB	LP38842SX-1.5/NOPB	LP3892ESX-1.5/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Output Voltage	1.5V	1.5V	1.5V	1.5V
Output Current	1.5A	1.5A	1.5A	1.5A
Input Voltage (Max)	5.5V	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.27V @ 1.5A	0.27V @ 1.5A	0.315V @ 1.5A	0.5V @ 1.5A
Quiescent Current	30 µA	30 µA	30 µA	30 µA
Supply Current (Max)	8 mA	8 mA	40 mA	8 mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

LP3882ESX-1.5/NOPB is the direct equivalent substitute, offering identical electrical specifications with active product status and ROHS3 compliance. This part is the primary choice for new designs requiring direct replacement of the obsolete LP3882ESX-1.5.

LP38842SX-1.5/NOPB is a parametric equivalent with active status and ROHS3 compliance. The increased dropout voltage (0.315V versus 0.27V) and higher supply current (40 mA versus 8 mA) represent the primary differences. This part is suitable for applications where the higher dropout voltage and supply current do not impact system performance.

LP3892ESX-1.5/NOPB is a parametric equivalent from National Semiconductor with active product status. The significantly higher dropout voltage (0.5V) makes this part suitable only for applications with sufficient input voltage margin and where the increased voltage drop is acceptable. The identical quiescent current and supply current specifications match the original part.

Frequently Asked Questions (FAQ)

Q: Can LP3882ESX-1.5/NOPB be used as a direct replacement for LP3882ESX-1.5?

A: Yes. LP3882ESX-1.5/NOPB maintains identical electrical specifications including output voltage, output current, dropout voltage, and quiescent current. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). Pin configuration and package footprint are identical.

Q: What is the impact of higher dropout voltage in LP38842SX-1.5/NOPB?

A: The LP38842SX-1.5/NOPB has a maximum dropout voltage of 0.315V compared to 0.27V in the original part. This 0.045V difference requires additional input voltage headroom. For applications with tight input voltage margins, verify that the input supply can accommodate this increased dropout voltage while maintaining regulated output.

Q: Is LP3892ESX-1.5/NOPB compatible with existing PCB layouts?

A: Yes. LP3892ESX-1.5/NOPB uses the same TO-263 (DDPAK-5) package and pin configuration, ensuring mechanical and electrical compatibility with existing PCB designs. However, the 0.5V dropout voltage is significantly higher than the original part and requires verification that system input voltage specifications can tolerate this increase.

Q: What are the packaging differences among these substitute parts?

A: LP3882ESX-1.5/NOPB is supplied in Tape & Reel (TR) packaging. LP38842SX-1.5/NOPB is supplied in Tape & Reel (TR) packaging. LP3892ESX-1.5/NOPB is supplied in Bulk packaging. All three parts use the identical TO-263 (DDPAK-5) surface mount package footprint.

Q: Which substitute part should be selected for new production designs?

A: LP3882ESX-1.5/NOPB is the recommended choice for new designs, offering active product status, ROHS3 compliance, and identical electrical specifications to the obsolete original part. This ensures long-term supply availability and regulatory compliance.

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