LP3855EMPX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3855EMPX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1.5A output current in a compact SOT-223-5 package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	6.6V
Current - Output	1.5A
Voltage Dropout (Max)	0.435V @ 1.5A
Current - Quiescent (Iq)	3 mA
PSRR	73dB ~ 57dB (120Hz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5

Substitute Part Grouping Explanation

Substitution for the LP3855EMPX-ADJ is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage specifications (Input Max: 7V, Output Min: 1.23V, Output Max: 6.6V)
Current rating (1.5A output)
Voltage dropout (0.435V @ 1.5A)
Protection features (Over Current, Over Temperature, Short Circuit)
Package type (SOT-223-5)
Mounting type (Surface Mount)

The substitute parts identified maintain identical electrical and mechanical specifications. Differences exist only in product status, packaging format, and regulatory compliance status.

Parameter Comparison

Parameter	LP3855EMPX-ADJ	LP3855EMPX-ADJ/NOPB	LP3855EMP-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	7V	7V	7V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V
Voltage - Output (Max)	6.6V	6.6V	6.6V
Current - Output	1.5A	1.5A	1.5A
Voltage Dropout (Max)	0.435V @ 1.5A	0.435V @ 1.5A	0.435V @ 1.5A
Current - Quiescent (Iq)	3 mA	3 mA	3 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

LP3855EMPX-ADJ/NOPB is the direct manufacturer substitute with active product status and ROHS3 compliance. This part number includes the "/NOPB" suffix indicating lead-free manufacturing and is supplied in Tape & Reel format suitable for automated assembly processes.

LP3855EMP-ADJ/NOPB is a parametric equivalent offering identical electrical performance and ROHS3 compliance. This variant is supplied in Cut Tape and Digi-Reel format and maintains the highest inventory availability among the three options.

Both substitute parts are active products from Texas Instruments, eliminating obsolescence risk associated with the original LP3855EMPX-ADJ. Selection between the two substitutes depends on packaging and supply chain requirements rather than electrical performance.

Frequently Asked Questions (FAQ)

Q: Can LP3855EMPX-ADJ/NOPB directly replace LP3855EMPX-ADJ?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The "/NOPB" suffix indicates lead-free manufacturing.

Q: What is the difference between LP3855EMPX-ADJ/NOPB and LP3855EMP-ADJ/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications and RoHS3 compliance. The difference is packaging format: LP3855EMPX-ADJ/NOPB is supplied in Tape & Reel, while LP3855EMP-ADJ/NOPB is supplied in Cut Tape and Digi-Reel format.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-223-5 package with identical pinout and mechanical dimensions.

Q: Which substitute should I select for new designs?

A: Either LP3855EMPX-ADJ/NOPB or LP3855EMP-ADJ/NOPB are suitable for new designs. Both are active products with ROHS3 compliance. Choose based on your assembly process requirements and packaging preferences.

Q: Is the original LP3855EMPX-ADJ still available?

A: The original part is listed as obsolete. Active substitutes with superior compliance status are available.

Q: Do the substitute parts maintain the same thermal and electrical performance?

A: Yes. All electrical parameters including voltage dropout, quiescent current, PSRR, and protection features are identical across all three part numbers.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message