LP3966ET-ADJ Linear Voltage Regulator IC

Part Overview

The LP3966ET-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Power Management (PMIC) component delivers 3A output current in a TO-220-5 package configuration. The device is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning. The LP3966ET-ADJ provides adjustable output voltage regulation with integrated protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3966ET-ADJ
Category	Power Management (PMIC)
Package / Case	TO-220-5 Formed Leads
Output Configuration	Positive
Output Type	Adjustable
Current - Output	3A
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.216V
Voltage - Output (Max)	5.1V
Voltage Dropout (Max)	1.2V @ 3A
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LP3966ET-ADJ are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output Configuration: Positive
Output Type: Adjustable
Package / Case: TO-220-5
Mounting Type: Through Hole
Operating Temperature Range: -40°C ~ 125°C
Protection Features: Over Temperature and Short Circuit (minimum)
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Voltage - Input (Max): 6V or higher
Voltage - Output (Min/Fixed): 0.8V or lower
Voltage - Output (Max): 5V or higher
Current - Output: 1.5A or higher

The LP3966ET-ADJ has two identified substitutes: LP3966ET-ADJ/NOPB (direct equivalent from Texas Instruments) and MCP1827-ADJE/AT (cross-manufacturer alternative from Microchip Technology).

Parameter Comparison

Parameter	LP3966ET-ADJ	LP3966ET-ADJ/NOPB	MCP1827-ADJE/AT
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Current - Output	3A	3A	1.5A
Voltage - Input (Max)	7V	7V	6V
Voltage - Output (Min/Fixed)	1.216V	1.216V	0.8V
Voltage - Output (Max)	5.1V	5.1V	5V
Voltage Dropout (Max)	1.2V @ 3A	1.2V @ 3A	0.6V @ 1.5A
Current - Quiescent (Iq)	9 mA	9 mA	220 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active

Engineering Selection Recommendations

LP3966ET-ADJ/NOPB is the direct equivalent substitute from Texas Instruments. This part maintains identical electrical specifications and package configuration while offering Active product status, providing superior long-term availability and supply chain continuity compared to the Last Time Buy LP3966ET-ADJ.

MCP1827-ADJE/AT from Microchip Technology is a cross-manufacturer alternative suitable for applications where output current requirements do not exceed 1.5A. This substitute offers lower quiescent current (220 µA versus 9 mA) and improved dropout voltage performance (0.6V @ 1.5A versus 1.2V @ 3A). The MCP1827-ADJE/AT includes Under Voltage Lockout (UVLO) protection in addition to over-temperature and short-circuit protection. Maximum input voltage is 6V compared to 7V for the LP3966ET-ADJ. Both substitutes maintain ROHS3 compliance and identical operating temperature range.

Selection between LP3966ET-ADJ/NOPB and MCP1827-ADJE/AT depends on application current requirements. For designs requiring 3A output current, LP3966ET-ADJ/NOPB is the appropriate selection. For applications with maximum current requirements of 1.5A or less, MCP1827-ADJE/AT provides enhanced efficiency through lower quiescent current and reduced dropout voltage.

Frequently Asked Questions (FAQ)

Q: Can LP3966ET-ADJ/NOPB be used as a direct replacement for LP3966ET-ADJ?

A: Yes. LP3966ET-ADJ/NOPB is a direct equivalent with identical electrical specifications, package configuration, and performance characteristics. The primary difference is product status: LP3966ET-ADJ/NOPB is Active while LP3966ET-ADJ is Last Time Buy.

Q: What are the limitations when substituting MCP1827-ADJE/AT for LP3966ET-ADJ?

A: The MCP1827-ADJE/AT has a maximum output current of 1.5A compared to 3A for the LP3966ET-ADJ. Maximum input voltage is 6V versus 7V. These specifications must be verified against application requirements before substitution.

Q: Are all three parts pin-compatible?

A: All three parts use TO-220-5 package configuration with through-hole mounting. Pin compatibility must be verified against specific application schematics and PCB layouts, as package designation alone does not guarantee identical pinout.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. LP3966ET-ADJ/NOPB and MCP1827-ADJE/AT are both ROHS3 compliant and REACH unaffected, matching the compliance profile of the original LP3966ET-ADJ.

Q: Which substitute offers better efficiency?

A: MCP1827-ADJE/AT provides lower quiescent current (220 µA versus 9 mA) and lower dropout voltage (0.6V @ 1.5A versus 1.2V @ 3A), resulting in improved efficiency for applications within its 1.5A current rating.

Q: What protection features differ between the substitutes?

A: LP3966ET-ADJ and LP3966ET-ADJ/NOPB include over-current protection in addition to over-temperature and short-circuit protection. MCP1827-ADJE/AT includes under-voltage lockout (UVLO) protection instead of over-current protection.

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