LP3852ESX-3.3 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3852ESX-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Substiute Parts

LP3852ESX-3.3

Texas InstrumentsIn Stock: 1201LP3852ESX-3.3 Datasheet

Current PartRFQ

LP3852ESX-3.3/NOPB

Texas InstrumentsIn Stock: 2415LP3852ESX-3.3/NOPB Datasheet

DirectRFQ

LP3855ESX-3.3/NOPB

National SemiconductorIn Stock: 1711LP3855ESX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3872ESX-3.3/NOPB

Texas InstrumentsIn Stock: 1623LP3872ESX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3875ESX-3.3/NOPB

National SemiconductorIn Stock: 1462LP3875ESX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3962ESX-3.3/NOPB

Texas InstrumentsIn Stock: 2327LP3962ESX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3965ESX-3.3/NOPB

National SemiconductorIn Stock: 2875LP3965ESX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

MIC29151-3.3WU

Microchip TechnologyIn Stock: 12328MIC29151-3.3WU Datasheet

MFR RecommendedRFQ

MIC29151-3.3WU-TR

Microchip TechnologyIn Stock: 5072MIC29151-3.3WU-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3852ESX-3.3 is determined by the following critical parameters:

• Output voltage: 3.3V fixed
• Output current capability: 1.5A minimum
• Package type: TO-263 (DDPAK-5) surface mount
• Input voltage rating: 7V or higher
• Operating temperature range: -40°C to 125°C
• Protection features: Over-current, over-temperature, and short-circuit protection
• Control features: Enable function

Substitute parts are grouped into two categories: direct manufacturer equivalents (identical specifications) and parametric equivalents (functionally compatible with minor specification variations). The MIC29151-3.3WU series from Microchip Technology represents manufacturer-recommended alternatives with enhanced input voltage rating and additional protection features.

Parameter Comparison

Engineering Selection Recommendations

For designs currently using the obsolete LP3852ESX-3.3, the following selection path is recommended based on product status and compliance:

Primary Choice: LP3852ESX-3.3/NOPB (Texas Instruments) — This is the direct equivalent with active product status and ROHS3 compliance. It maintains identical electrical specifications and packaging, providing a drop-in replacement with no design modifications required.

Secondary Choices: LP3855ESX-3.3/NOPB (National Semiconductor) — Parametric equivalent with identical dropout voltage and quiescent current, maintaining performance parity with the original part.

Alternative Selections: LP3872ESX-3.3/NOPB, LP3875ESX-3.3/NOPB, LP3962ESX-3.3/NOPB, and LP3965ESX-3.3/NOPB are parametric equivalents with increased dropout voltage (0.55V) and higher quiescent current. These are suitable for applications where the slightly degraded efficiency characteristics are acceptable.

Enhanced Input Voltage Rating: MIC29151-3.3WU and MIC29151-3.3WU-TR (Microchip Technology) offer manufacturer-recommended alternatives with extended input voltage rating (26V maximum) and additional protection features including reverse polarity and transient voltage protection. These parts are suitable for applications requiring higher input voltage tolerance or enhanced protection.

Frequently Asked Questions (FAQ)

Q: Can LP3852ESX-3.3/NOPB directly replace the obsolete LP3852ESX-3.3?

A: Yes. The LP3852ESX-3.3/NOPB is the direct equivalent with identical electrical specifications, package type (TO-263 DDPAK-5), and performance characteristics. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant). No design changes are required.

Q: What is the difference between LP3855ESX-3.3/NOPB and LP3872ESX-3.3/NOPB?

A: Both are parametric equivalents with the same output voltage and current rating. LP3855ESX-3.3/NOPB maintains the original 0.38V dropout voltage and 3 mA quiescent current. LP3872ESX-3.3/NOPB has increased dropout voltage (0.55V) and quiescent current (5 mA), resulting in slightly higher power dissipation. Selection depends on thermal budget and efficiency requirements.

Q: Why would I choose MIC29151-3.3WU over the LP series alternatives?

A: The MIC29151-3.3WU series provides a higher input voltage rating (26V vs. 7V) and additional protection features including reverse polarity and transient voltage protection. This makes it suitable for applications with higher input voltage requirements or where enhanced protection is necessary. The trade-off is slightly higher dropout voltage (0.6V).

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

A: All parts use TO-263 surface mount packages (DDPAK-5 or TO-263-5 variants), ensuring mechanical compatibility. Packaging options vary by part number: some are available in Tape & Reel (TR), Bulk, or Cut Tape (CT) formats. Verify packaging availability with your supplier for production requirements.

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

A: The /NOPB suffix indicates "No Plumbum" (lead-free) and RoHS compliance. Parts with this designation meet RoHS3 requirements and are suitable for applications requiring compliance with environmental regulations.

Q: Can I use LP3962ESX-3.3/NOPB or LP3965ESX-3.3/NOPB as direct replacements?

A: These parts are parametric equivalents with higher quiescent current (9 mA vs. 3 mA) and increased dropout voltage (0.55V vs. 0.38V). They are functionally compatible but will have higher power dissipation. Use them only if your thermal design accommodates the increased current draw and if the higher dropout voltage does not compromise system performance.