LP3855EMP-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3855EMP-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. The main part is currently listed as obsolete, making equivalent 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
Voltage Dropout (Max)	0.435V @ 1.5A
Current - Output	1.5A
Current - Quiescent (Iq)	3 mA
Current - Supply (Max)	10 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
Base Product Number	LP3855

Substitute Part Grouping Explanation

Substitute parts for the LP3855EMP-ADJ are identified based on strict electrical and mechanical parameter matching. All substitute candidates must maintain identical specifications across the following critical parameters:

Output configuration (Positive), output type (Adjustable), number of regulators (1), maximum input voltage (7V), output voltage range (1.23V to 6.6V), maximum dropout voltage (0.435V @ 1.5A), output current (1.5A), quiescent current (3 mA), maximum supply current (10 mA), PSRR (73dB ~ 57dB at 120Hz), control features (Enable), protection features (Over Current, Over Temperature, Short Circuit), operating temperature range (-40°C ~ 125°C), mounting type (Surface Mount), and package type (SOT-223-5).

The identified substitutes are packaging variants and product status updates of the same base product number LP3855, ensuring functional and electrical equivalence.

Parameter Comparison

Parameter	LP3855EMP-ADJ	LP3855EMP-ADJ/NOPB	LP3855EMPX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Packaging	-	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
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
Voltage Dropout (Max)	0.435V @ 1.5A	0.435V @ 1.5A	0.435V @ 1.5A
Current - Output	1.5A	1.5A	1.5A
Current - Quiescent (Iq)	3 mA	3 mA	3 mA
Current - Supply (Max)	10 mA	10 mA	10 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

LP3855EMP-ADJ/NOPB and LP3855EMPX-ADJ/NOPB are direct functional equivalents to the obsolete LP3855EMP-ADJ. Both substitute parts maintain identical electrical specifications and physical package dimensions.

The primary distinction between substitutes is product status and compliance certification. LP3855EMP-ADJ/NOPB and LP3855EMPX-ADJ/NOPB are both active products with ROHS3 compliance, whereas the original LP3855EMP-ADJ is obsolete and RoHS non-compliant. For new designs or procurement requiring regulatory compliance, either active substitute is appropriate.

Packaging format differs between the two active substitutes: LP3855EMP-ADJ/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, while LP3855EMPX-ADJ/NOPB is supplied in Tape & Reel (TR) format. Selection between these two should be based on procurement volume and assembly line requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3855EMP-ADJ/NOPB directly replace LP3855EMP-ADJ in existing designs?

A: Yes. All electrical parameters, output specifications, control features, protection mechanisms, operating temperature range, and physical package dimensions are identical. The primary difference is product status and RoHS compliance certification.

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

A: Both parts are electrically and mechanically identical. The difference is packaging format: LP3855EMP-ADJ/NOPB uses Cut Tape (CT) & Digi-Reel® packaging, while LP3855EMPX-ADJ/NOPB uses Tape & Reel (TR) packaging. Selection depends on procurement volume and assembly equipment compatibility.

Q: Why is the original LP3855EMP-ADJ listed as obsolete?

A: The original part is no longer in active production. Active equivalents LP3855EMP-ADJ/NOPB and LP3855EMPX-ADJ/NOPB are available for new designs and ongoing procurement.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LP3855EMP-ADJ/NOPB and LP3855EMPX-ADJ/NOPB are ROHS3 compliant, whereas the original LP3855EMP-ADJ is RoHS non-compliant.

Q: Do the substitute parts maintain the same SOT-223-5 package?

A: Yes. All three parts use the SOT-223-5 supplier device package with TO-261-5 and TO-261AB case designations. Physical footprint and pin configuration are identical.

Q: What are the key electrical parameters that define substitution for this linear regulator?

A: Substitution is determined by matching output configuration (Positive), output type (Adjustable), maximum input voltage (7V), output voltage range (1.23V to 6.6V), maximum dropout voltage (0.435V @ 1.5A), output current (1.5A), quiescent current (3 mA), PSRR (73dB ~ 57dB at 120Hz), protection features (Over Current, Over Temperature, Short Circuit), and operating temperature range (-40°C ~ 125°C).

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