LP3855ESX-5.0 Equivalent & Substitute Parts

Part Overview

The LP3855ESX-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 5V output at 1.5A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same electrical performance characteristics and package footprint, enabling direct replacement in existing circuit designs.

Substiute Parts

LP3855ESX-5.0

Texas InstrumentsIn Stock: 4911LP3855ESX-5.0 Datasheet

Current PartRFQ

LP3855ESX-5.0/NOPB

Texas InstrumentsIn Stock: 839LP3855ESX-5.0/NOPB Datasheet

DirectRFQ

LP3852ESX-5.0/NOPB

Texas InstrumentsIn Stock: 1170LP3852ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3872ESX-5.0/NOPB

National SemiconductorIn Stock: 9340LP3872ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3962ESX-5.0/NOPB

Texas InstrumentsIn Stock: 737LP3962ESX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3855ESX-5.0 are grouped into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Equivalent: LP3855ESX-5.0/NOPB maintains identical electrical specifications and package configuration. This part is the active production variant with RoHS3 compliance.

Parametric Equivalents: LP3852ESX-5.0/NOPB, LP3872ESX-5.0/NOPB, and LP3962ESX-5.0/NOPB share the same output voltage (5V), output current (1.5A), input voltage rating (7V max), operating temperature range (-40°C to 125°C), package type (TO-263 DDPAK-5), and protection features (Over Current, Over Temperature, Short Circuit). These parts are functionally interchangeable based on the allowed electrical and mechanical parameters for linear voltage regulators in this category.

Key parameters determining substitution eligibility:

• Fixed output voltage: 5V
• Output current rating: 1.5A
• Input voltage maximum: 7V
• Package footprint: TO-263 (DDPAK-5)
• Surface mount configuration
• Protection feature set: Over Current, Over Temperature, Short Circuit

Parameter Comparison

Engineering Selection Recommendations

LP3855ESX-5.0/NOPB is the primary recommended substitute. It is the active production equivalent with identical electrical specifications, RoHS3 compliance, and the same TO-263 package footprint. This part provides direct compatibility with existing designs and procurement processes.

LP3852ESX-5.0/NOPB is a secondary equivalent option. It maintains identical voltage dropout performance (0.38V @ 1.5A) and quiescent current (3 mA) as the original part, with RoHS3 compliance and active product status.

LP3872ESX-5.0/NOPB and LP3962ESX-5.0/NOPB are functional alternatives with higher voltage dropout (0.55V @ 1.5A) and increased quiescent current. LP3872ESX-5.0/NOPB draws 5 mA quiescent current, while LP3962ESX-5.0/NOPB draws 9 mA. These parts remain electrically compatible within the specified parameter ranges but exhibit different power dissipation characteristics. Selection depends on thermal and power budget constraints in the target application.

All substitute parts share identical package footprints, enabling direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3855ESX-5.0/NOPB be used as a direct replacement for LP3855ESX-5.0?

A: Yes. LP3855ESX-5.0/NOPB is the active production equivalent with identical electrical specifications, output voltage (5V), output current (1.5A), voltage dropout (0.38V @ 1.5A), and TO-263 package configuration. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What is the difference between LP3852ESX-5.0/NOPB and LP3872ESX-5.0/NOPB?

A: Both parts deliver 5V at 1.5A with identical input voltage ratings (7V max) and operating temperature ranges (-40°C to 125°C). LP3852ESX-5.0/NOPB maintains the lower voltage dropout (0.38V @ 1.5A) and quiescent current (3 mA) of the original part. LP3872ESX-5.0/NOPB has higher voltage dropout (0.55V @ 1.5A) and quiescent current (5 mA), resulting in increased power dissipation.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and footprint, enabling direct PCB compatibility without layout changes.

Q: Which substitute part should I select for lowest power consumption?

A: LP3855ESX-5.0/NOPB and LP3852ESX-5.0/NOPB both feature 3 mA quiescent current, the lowest among the available substitutes. LP3872ESX-5.0/NOPB draws 5 mA, and LP3962ESX-5.0/NOPB draws 9 mA.

Q: Are all substitute parts RoHS compliant?

A: LP3855ESX-5.0/NOPB, LP3852ESX-5.0/NOPB, and LP3962ESX-5.0/NOPB are ROHS3 compliant. RoHS status for LP3872ESX-5.0/NOPB is not specified in the available data.

Q: Can LP3962ESX-5.0/NOPB replace LP3855ESX-5.0 in all applications?

A: LP3962ESX-5.0/NOPB is electrically compatible based on output voltage (5V), output current (1.5A), input voltage (7V max), and package type. However, it has higher voltage dropout (0.55V vs. 0.38V @ 1.5A) and quiescent current (9 mA vs. 3 mA), resulting in increased power dissipation. Selection depends on thermal budget and efficiency requirements of the target application.