LP38853SX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38853SX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 3A output current in a TO-263 (DDPAK-7) surface mount package and operates across an input voltage range up to 5.5V with adjustable output voltage from 0.8V to 1.8V. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production support, design updates, and inventory management.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	5.5V
Voltage - Output (Min/Fixed)	0.8V
Voltage - Output (Max)	1.8V
Current - Output	3A
Voltage Dropout (Max)	0.45V @ 3A
Current - Quiescent (Iq)	300 µA
Current - Supply (Max)	9 mA
PSRR	80dB ~ 70dB (120Hz ~ 1kHz)
Control Features	Enable, Soft Start
Protection Features	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Supplier Device Package	TO-263 (DDPAK-7)

Substitute Part Grouping Explanation

Substitution of the LP38853SX-ADJ is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Number of regulators (1)
Maximum input voltage (5.5V)
Output voltage range (0.8V to 1.8V)
Output current capability (3A)
Voltage dropout specification (0.45V @ 3A)
Quiescent current (300 µA)
Control features (Enable, Soft Start)
Protection features (Over Current, Over Temperature, Short Circuit, UVLO)
Operating temperature range (-40°C ~ 125°C)
Package type (TO-263 DDPAK-7)

The LP38853SX-ADJ/NOPB is a parametric equivalent that maintains identical electrical and mechanical specifications while differing in product status and compliance certifications.

Parameter Comparison

Parameter	LP38853SX-ADJ	LP38853SX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Voltage - Input (Max)	5.5V	5.5V
Voltage - Output (Min/Fixed)	0.8V	0.8V
Voltage - Output (Max)	1.8V	1.8V
Current - Output	3A	3A
Voltage Dropout (Max)	0.45V @ 3A	0.45V @ 3A
Current - Quiescent (Iq)	300 µA	300 µA
Current - Supply (Max)	9 mA	9 mA
PSRR	80dB ~ 70dB (120Hz ~ 1kHz)	80dB ~ 70dB (120Hz ~ 1kHz)
Control Features	Enable, Soft Start	Enable, Soft Start
Protection Features	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-8, D2PAK (7 Leads + Tab), TO-263CA	TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Supplier Device Package	TO-263 (DDPAK-7)	TO-263 (DDPAK-7)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Type	Not specified	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

The LP38853SX-ADJ/NOPB is the direct substitute for the obsolete LP38853SX-ADJ. Both parts are manufactured by Texas Instruments and maintain identical electrical performance and mechanical compatibility. The primary distinction is product lifecycle status: the LP38853SX-ADJ is obsolete, while the LP38853SX-ADJ/NOPB is active and currently in production.

The LP38853SX-ADJ/NOPB offers improved compliance posture, meeting ROHS3 standards compared to the non-compliant status of the original part. This substitution is appropriate for new designs, production continuity, and inventory replenishment where regulatory compliance is required.

Frequently Asked Questions (FAQ)

Q: Can LP38853SX-ADJ/NOPB be used as a direct replacement for LP38853SX-ADJ?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters including output voltage range, current rating, dropout voltage, control features, and protection mechanisms. The primary difference is product status and RoHS compliance.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix designates the packaging configuration as Cut Tape (CT) and Digi-Reel® format, distinguishing it from the original part's unspecified packaging type.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. Both parts use the identical TO-263 (DDPAK-7) package with 7 leads plus tab. PCB footprints and thermal management considerations remain unchanged.

Q: Why is the original LP38853SX-ADJ marked as obsolete?

A: Product obsolescence is determined by the manufacturer's lifecycle management. The LP38853SX-ADJ/NOPB remains in active production and is the recommended source for ongoing supply.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical characteristics. Both parts deliver identical performance specifications.

Q: What is the inventory status for these parts?

A: LP38853SX-ADJ has 1190 pieces in stock (obsolete status). LP38853SX-ADJ/NOPB has 3700 pieces in stock (active status), providing greater availability for new orders.

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