LP3852ET-3.3 Equivalent & Substitute Parts

Part Overview

The LP3852ET-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 1.5A in a TO-220-5 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated 3.3V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.38V @ 1.5A
Quiescent Current (Iq)	3 mA
Package	TO-220-5 Formed Leads
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3852ET-3.3 is determined by the following critical parameters that must remain constant across all equivalent parts:

Output voltage: 3.3V fixed
Output current capability: 1.5A
Maximum input voltage: 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 to 125°C

Parts are grouped into two categories: direct manufacturer equivalents (identical part numbers with different packaging or compliance status) and parametric equivalents (functionally compatible with allowable variations in dropout voltage and quiescent current).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout (Max)	Quiescent Current (Iq)	Supply Current (Max)	Packaging	RoHS Status
LP3852ET-3.3	Texas Instruments	Obsolete	0.38V @ 1.5A	3 mA	10 mA	—	RoHS non-compliant
LP3852ET-3.3/NOPB	National Semiconductor	Active	0.38V @ 1.5A	3 mA	10 mA	Bulk	ROHS3 Compliant
LP3855ET-3.3/NOPB	Texas Instruments	Active	0.38V @ 1.5A	3 mA	10 mA	Tube	ROHS3 Compliant
LP3875ET-3.3/NOPB	Texas Instruments	Active	0.55V @ 1.5A	5 mA	15 mA	Tube	ROHS3 Compliant
LP3962ET-3.3/NOPB	Texas Instruments	Active	0.55V @ 1.5A	9 mA	15 mA	Tube	ROHS3 Compliant
LP3962ET-3.3/LB05	Texas Instruments	Last Time Buy	0.55V @ 1.5A	9 mA	15 mA	Tube	ROHS3 Compliant
LP3965ET-3.3/NOPB	Texas Instruments	Active	0.55V @ 1.5A	9 mA	15 mA	Tube	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice): LP3855ET-3.3/NOPB is the preferred substitute. It maintains identical electrical specifications to the LP3852ET-3.3, including 0.38V maximum dropout voltage and 3 mA quiescent current. The part is in active production status with ROHS3 compliance and is available in Tube packaging.

Alternative Direct Equivalent: LP3852ET-3.3/NOPB from National Semiconductor provides identical electrical performance with active product status and ROHS3 compliance. This part is available in Bulk packaging.

Parametric Equivalents (Acceptable with Design Verification): LP3875ET-3.3/NOPB, LP3962ET-3.3/NOPB, LP3962ET-3.3/LB05, and LP3965ET-3.3/NOPB are parametric equivalents with increased dropout voltage (0.55V vs. 0.38V) and higher quiescent current (5-9 mA vs. 3 mA). These parts are suitable for applications where the higher dropout voltage and increased quiescent current do not impact system performance. All are in active production or Last Time Buy status with ROHS3 compliance.

Avoid: LP3962ET-3.3/LB05 is designated Last Time Buy, indicating limited future availability.

Frequently Asked Questions (FAQ)

Q: Can I use LP3875ET-3.3/NOPB as a direct replacement for LP3852ET-3.3? A: LP3875ET-3.3/NOPB is a parametric equivalent with the same output voltage and current rating. However, it has a higher dropout voltage (0.55V vs. 0.38V) and higher quiescent current (5 mA vs. 3 mA). It is suitable if your circuit design accommodates these differences. For applications sensitive to dropout voltage or power consumption, LP3855ET-3.3/NOPB is the preferred choice.

Q: What is the difference between LP3852ET-3.3/NOPB and LP3855ET-3.3/NOPB? A: Both parts have identical electrical specifications (0.38V dropout, 3 mA quiescent current). The primary difference is the manufacturer: LP3852ET-3.3/NOPB is from National Semiconductor, while LP3855ET-3.3/NOPB is from Texas Instruments. Both are active products with ROHS3 compliance.

Q: Why is the LP3852ET-3.3 marked as obsolete? A: The original LP3852ET-3.3 is no longer in production. However, equivalent parts with identical or compatible specifications remain available from active product lines, ensuring design continuity.

Q: Are all substitute parts available in the same TO-220-5 package? A: Yes, all listed substitute parts use the TO-220-5 Formed Leads package with Through Hole mounting. Packaging format (Bulk, Tube) differs but does not affect electrical compatibility.

Q: Which substitute part has the lowest power consumption? A: LP3852ET-3.3/NOPB and LP3855ET-3.3/NOPB both have the lowest quiescent current at 3 mA. These are the best choices for power-sensitive applications.

Q: Are all substitute parts RoHS compliant? A: All substitute parts listed are ROHS3 compliant except the original LP3852ET-3.3, which is RoHS non-compliant. For new designs or compliance-required applications, use ROHS3 compliant alternatives.

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