LP3852ET-1.8 Equivalent & Substitute Parts

Part Overview

The LP3852ET-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 1.8V output at 1.5A maximum current in a TO-220-5 package configuration. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	1.5A
Voltage - Input (Max)	7V
Voltage Dropout (Max)	0.38V @ 1.5A
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-220-5 Formed Leads
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3852ET-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Maximum output current of 1.5A
Maximum input voltage of 7V
TO-220-5 package with through-hole mounting
Positive fixed output configuration
Enable control feature
Over current, over temperature, and short circuit protection

The substitute parts LP3852ET-1.8/NOPB, LP3855ET-1.8/NOPB, and LP3965ET-1.8/NOPB meet these core electrical and mechanical requirements. LP3852ET-1.8/NOPB and LP3855ET-1.8/NOPB are direct parametric equivalents with identical electrical performance. LP3965ET-1.8/NOPB is a parametric equivalent with acceptable variations in quiescent current and dropout voltage within the same functional class.

Parameter Comparison

Parameter	LP3852ET-1.8	LP3852ET-1.8/NOPB	LP3855ET-1.8/NOPB	LP3965ET-1.8/NOPB
Product Status	Obsolete	Active	Active	Active
Voltage - Output (Min/Fixed)	1.8V	1.8V	1.8V	1.8V
Current - Output	1.5A	1.5A	1.5A	1.5A
Voltage - Input (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	0.38V @ 1.5A	0.38V @ 1.5A	0.38V @ 1.5A	0.55V @ 1.5A
Current - Quiescent (Iq)	3 mA	3 mA	3 mA	9 mA
Current - Supply (Max)	10 mA	10 mA	10 mA	15 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Not specified	Tube	Tube	Tube

Engineering Selection Recommendations

LP3852ET-1.8/NOPB is the preferred direct substitute. It maintains identical electrical specifications to the original part while offering active product status and ROHS3 compliance. The /NOPB designation indicates lead-free construction, meeting modern environmental and regulatory standards.

LP3855ET-1.8/NOPB is an alternative direct equivalent with matching electrical performance, quiescent current, and dropout voltage characteristics. It is actively manufactured and ROHS3 compliant.

LP3965ET-1.8/NOPB is a parametric equivalent suitable for applications where increased quiescent current (9 mA versus 3 mA) and higher dropout voltage (0.55V versus 0.38V) are acceptable. This part is actively produced and ROHS3 compliant. Selection of this part requires confirmation that the higher quiescent current and dropout voltage do not impact system performance or thermal management.

All substitute parts share identical package configuration, mounting type, and core protection features with the original LP3852ET-1.8.

Frequently Asked Questions (FAQ)

Q: Can LP3852ET-1.8/NOPB be used as a direct replacement for LP3852ET-1.8?

A: Yes. LP3852ET-1.8/NOPB is a direct equivalent with identical electrical specifications. The primary differences are active product status and ROHS3 compliance. The /NOPB designation indicates lead-free construction.

Q: What is the difference between LP3852ET-1.8/NOPB and LP3855ET-1.8/NOPB?

A: Both parts are direct parametric equivalents with identical output voltage, current rating, dropout voltage, quiescent current, and PSRR specifications. The primary difference is the base product number (LP3852 versus LP3855). Both are suitable for the same applications.

Q: Can LP3965ET-1.8/NOPB replace LP3852ET-1.8 in all applications?

A: LP3965ET-1.8/NOPB meets the core functional requirements but has higher quiescent current (9 mA versus 3 mA) and higher dropout voltage (0.55V versus 0.38V). Applications sensitive to quiescent current draw or requiring lower dropout voltage should use LP3852ET-1.8/NOPB or LP3855ET-1.8/NOPB instead.

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

A: Yes. All substitute parts use TO-220-5 Formed Leads packaging with through-hole mounting, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the significance of the /NOPB designation?

A: The /NOPB designation indicates lead-free (Pb-free) construction, meeting RoHS3 compliance requirements. This is standard for active production parts from Texas Instruments.

Q: Is the original LP3852ET-1.8 still available?

A: The original LP3852ET-1.8 is listed as obsolete. LP3852ET-1.8/NOPB, LP3855ET-1.8/NOPB, and LP3965ET-1.8/NOPB are active alternatives with current availability.

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