LP38842S-1.5 Equivalent & Substitute Parts

Part Overview

The LP38842S-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 ongoing production requirements. The device provides integrated protection features including over-current, over-temperature, and under-voltage lockout (UVLO) functionality, with an enable control feature for flexible power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.5V
Output Current	1.5A
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.315V @ 1.5A
Quiescent Current	30 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Protection Features	Over Current, Over Temperature, UVLO
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP38842S-1.5 is determined by the following critical parameters:

Output voltage fixed at 1.5V
Output current capability of 1.5A
Maximum input voltage of 5.5V
TO-263 (DDPAK-5) package compatibility
Identical protection and control features (Over Current, Over Temperature, UVLO, Enable)
Operating temperature range of -40°C to 125°C

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional equivalence in applications designed for the LP38842S-1.5. Variations in voltage dropout characteristics and quiescent current supply are noted but do not preclude substitution where the application tolerances permit.

Parameter Comparison

Parameter	LP38842S-1.5	LP38842S-1.5/NOPB	LP3882ES-1.5/NOPB	LP3892ES-1.5/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
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)	0.315V @ 1.5A	0.315V @ 1.5A	0.27V @ 1.5A	0.5V @ 1.5A
Quiescent Current (Iq)	30 µA	30 µA	30 µA	30 µA
Supply Current (Max)	40 mA	40 mA	8 mA	8 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)
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	ROHS3 Compliant

Engineering Selection Recommendations

LP38842S-1.5/NOPB is the direct manufacturer equivalent with identical electrical specifications and active product status. This part is ROHS3 compliant and represents the primary substitute for obsolete LP38842S-1.5 applications.

LP3882ES-1.5/NOPB provides parametric equivalence with improved voltage dropout performance (0.27V vs. 0.315V) and reduced supply current (8 mA vs. 40 mA), offering enhanced efficiency characteristics. This part is ROHS3 compliant and active.

LP3892ES-1.5/NOPB maintains full functional equivalence with higher voltage dropout (0.5V @ 1.5A) and reduced supply current (8 mA). This part is ROHS3 compliant and active, though REACH status is affected compared to other alternatives.

All substitute parts are surface mount compatible in TO-263 (DDPAK-5) packaging and maintain identical output voltage, current rating, and protection feature sets.

Frequently Asked Questions (FAQ)

Q: Can LP38842S-1.5/NOPB directly replace LP38842S-1.5 in existing designs?

A: Yes. LP38842S-1.5/NOPB is the direct manufacturer equivalent with identical electrical specifications, package type, and functional characteristics. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LP3882ES-1.5/NOPB and LP3892ES-1.5/NOPB?

A: Both parts maintain 1.5V output and 1.5A current rating. LP3882ES-1.5/NOPB has lower voltage dropout (0.27V) compared to LP3892ES-1.5/NOPB (0.5V). LP3882ES-1.5/NOPB is preferred for applications requiring lower dropout voltage and improved efficiency.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use TO-263 (DDPAK-5) surface mount packaging, ensuring mechanical and thermal compatibility with LP38842S-1.5 PCB layouts.

Q: What compliance certifications apply to substitute parts?

A: LP38842S-1.5/NOPB and LP3882ES-1.5/NOPB are ROHS3 compliant. LP3892ES-1.5/NOPB is ROHS3 compliant with affected REACH status. All parts are EAR99 classified.

Q: Can I use LP3882ES-1.5/NOPB or LP3892ES-1.5/NOPB if my application requires the exact voltage dropout specification of LP38842S-1.5?

A: LP3882ES-1.5/NOPB has lower dropout (0.27V), which is acceptable for applications tolerating reduced dropout. LP3892ES-1.5/NOPB has higher dropout (0.5V) and should be evaluated against application input voltage and load requirements.

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