LP3963ET-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP3963ET-3.3/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 3A maximum current in a TO-220-5 package configuration. The device is currently marked as obsolete, making identification of suitable substitute parts essential for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3963ET-3.3/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC REG LINEAR 3.3V 3A TO220-5
Output Voltage (Fixed)	3.3V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.2V @ 3A
Quiescent Current	9 mA
Operating Temperature Range	-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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3963ET-3.3/NOPB are identified based on the following critical parameters that determine functional compatibility:

Output voltage: 3.3V fixed
Output current capability: 3A
Input voltage maximum: 7V
Package type: TO-220-5 Formed Leads
Mounting type: Through Hole
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function
Operating temperature range: -40°C ~ 125°C

The LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are classified as manufacturer-recommended and parametric equivalents respectively. Both meet all critical electrical and mechanical parameters. The LP3876ET-3.3/NOPB is also a parametric equivalent, though manufactured by National Semiconductor rather than Texas Instruments.

Parameter Comparison

Parameter	LP3963ET-3.3/NOPB (Main)	LP3853ET-3.3/NOPB	LP3856ET-3.3/NOPB	LP3876ET-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	3A	3A	3A	3A
Input Voltage (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	1.2V @ 3A	0.6V @ 3A	0.6V @ 3A	1.2V @ 3A
Quiescent Current	9 mA	4 mA	4 mA	5 mA
Supply Current (Max)	15 mA	10 mA	10 mA	15 mA
PSRR	Not specified	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

For applications currently using the LP3963ET-3.3/NOPB, the LP3853ET-3.3/NOPB is the primary substitute choice. It is an active product from Texas Instruments with ROHS3 compliance, matching all critical electrical and mechanical parameters. The LP3853ET-3.3/NOPB additionally offers improved performance characteristics, including lower dropout voltage (0.6V vs. 1.2V) and reduced quiescent current (4 mA vs. 9 mA).

The LP3856ET-3.3/NOPB provides identical electrical performance to the LP3853ET-3.3/NOPB and is also an active Texas Instruments product with ROHS3 compliance. Both are suitable direct replacements.

The LP3876ET-3.3/NOPB, manufactured by National Semiconductor, meets all critical electrical and mechanical specifications. It maintains the same dropout voltage and supply current characteristics as the original LP3963ET-3.3/NOPB. Product status and RoHS compliance information for this part should be confirmed during procurement.

All substitute parts maintain the same TO-220-5 package configuration, enabling direct board-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the LP3853ET-3.3/NOPB be used as a direct replacement for the LP3963ET-3.3/NOPB?

A: Yes. Both parts deliver 3.3V at 3A output, operate across the same temperature range, use identical TO-220-5 packaging, and include the same protection and control features. The LP3853ET-3.3/NOPB is an active product and is the manufacturer-recommended substitute.

Q: What is the difference between the LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications. They deliver the same output voltage, current, dropout voltage, quiescent current, and PSRR performance. Both are active Texas Instruments products with ROHS3 compliance.

Q: Why does the LP3853ET-3.3/NOPB have lower quiescent current than the original LP3963ET-3.3/NOPB?

A: The LP3853ET-3.3/NOPB represents a newer design iteration with improved power efficiency characteristics. The reduced quiescent current (4 mA vs. 9 mA) results in lower standby power consumption while maintaining all functional requirements.

Q: Is the LP3876ET-3.3/NOPB from National Semiconductor compatible with the original design?

A: Yes. The LP3876ET-3.3/NOPB meets all critical electrical and mechanical parameters: 3.3V output, 3A current, 7V maximum input, TO-220-5 package, and identical protection features. It maintains the same dropout voltage and supply current specifications as the original LP3963ET-3.3/NOPB.

Q: Can these substitute parts be used interchangeably on the same PCB?

A: Yes. All substitute parts use the TO-220-5 Formed Leads package with identical pinout and thermal characteristics, enabling direct board-level substitution without layout or routing modifications.

Q: What compliance certifications apply to these substitute parts?

A: The LP3853ET-3.3/NOPB and LP3856ET-3.3/NOPB are ROHS3 compliant. All parts listed are REACH Unaffected and classified under ECCN EAR99 and HTSUS 8542.39.0001.

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