LP3855ESX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3855ESX-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 2.5V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The main part is currently listed as obsolete, making equivalent substitute parts essential for ongoing production and maintenance applications. Identifying compatible alternatives ensures design continuity and supply chain reliability for systems requiring this voltage regulation specification.

Substiute Parts

LP3855ESX-2.5

Texas InstrumentsIn Stock: 5879LP3855ESX-2.5 Datasheet

Current PartRFQ

LP3852ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1188LP3852ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3855ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1351LP3855ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3872ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1124LP3872ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3875ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1181LP3875ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3962ESX-2.5/NOPB

National SemiconductorIn Stock: 1811LP3962ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3965ESX-2.5/NOPB

Texas InstrumentsIn Stock: 1950LP3965ESX-2.5/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3855ESX-2.5 is determined by strict parameter matching across the following critical specifications:

Core Electrical Parameters (Must Match):

• Output voltage: 2.5V fixed
• Output current capability: 1.5A
• Maximum input voltage: 7V
• Output configuration: Positive
• Number of regulators: 1
• Control features: Enable function
• Protection features: Over Current, Over Temperature, Short Circuit

Package & Mechanical Parameters (Must Match):

• Package type: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
• Mounting type: Surface Mount

Acceptable Variation Parameters:

• Voltage dropout: Up to 0.55V @ 1.5A (original: 0.38V @ 1.5A)
• Quiescent current: Up to 9 mA (original: 3 mA)
• Supply current (max): Up to 15 mA (original: 10 mA)
• PSRR: May vary or be unspecified
• Manufacturer: Texas Instruments or National Semiconductor
• Product status: Active preferred over obsolete

All substitute parts listed maintain identical output voltage, current rating, input voltage limits, and package configuration. Variations in dropout voltage, quiescent current, and supply current remain within acceptable operational margins for this regulator class.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3855ESX-2.5/NOPB

This part is the direct active equivalent of the obsolete LP3855ESX-2.5. It maintains identical electrical specifications including the lower 0.38V dropout voltage and 3 mA quiescent current. ROHS3 compliance ensures regulatory alignment for new designs. Tape & Reel packaging supports automated assembly processes.

Secondary Recommendations: LP3852ESX-2.5/NOPB

Functionally equivalent to LP3855ESX-2.5/NOPB with identical electrical performance. Active product status and ROHS3 compliance provide supply continuity. Suitable for direct substitution in existing designs.

Alternative Options: LP3872ESX-2.5/NOPB, LP3875ESX-2.5/NOPB, LP3965ESX-2.5/NOPB

These parts accept higher dropout voltage (0.55V) and quiescent current specifications. All maintain 1.5A output current and 2.5V fixed output. ROHS3 compliance available for all Texas Instruments variants. Selection depends on thermal budget and power dissipation tolerance in the target application.

Cross-Manufacturer Option: LP3962ESX-2.5/NOPB

National Semiconductor equivalent with identical electrical ratings. Active product status supports availability. RoHS compliance status not specified in documentation. Suitable where multi-source qualification is required.

Frequently Asked Questions (FAQ)

Q: Can I use LP3872ESX-2.5/NOPB as a direct replacement for LP3855ESX-2.5?

A: Yes. Both deliver 2.5V at 1.5A in the same TO-263 package. The LP3872ESX-2.5/NOPB has higher dropout voltage (0.55V vs. 0.38V) and quiescent current (5 mA vs. 3 mA). Verify that your circuit's input voltage headroom and thermal design accommodate these differences.

Q: What is the difference between LP3855ESX-2.5 and LP3855ESX-2.5/NOPB?

A: The /NOPB suffix indicates lead-free, RoHS3 compliant packaging. The obsolete LP3855ESX-2.5 is non-compliant. The LP3855ESX-2.5/NOPB is the active equivalent with identical electrical performance.

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

A: Yes. All listed substitutes use TO-263-6 (D2PAK with 5 leads plus tab) surface mount packaging. Pinout and footprint compatibility is maintained across all alternatives.

Q: Which substitute has the lowest power dissipation?

A: LP3852ESX-2.5/NOPB and LP3855ESX-2.5/NOPB have the lowest quiescent current at 3 mA and lowest dropout voltage at 0.38V, resulting in minimal power loss compared to alternatives.

Q: Can I use LP3962ESX-2.5/NOPB from National Semiconductor?

A: Yes. It meets all core electrical and package requirements. Verify that your supply chain and quality documentation processes support National Semiconductor components if cross-manufacturer qualification is required.

Q: What does ROHS3 compliance mean for my application?

A: ROHS3 compliance certifies that the component meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This is mandatory for many markets and applications. The obsolete LP3855ESX-2.5 is non-compliant; all active substitutes offer ROHS3 compliance.