LP3856ES-5.0 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP3856ES-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 3A current capacity in a TO-263 (DDPAK-5) surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The part provides essential power management functionality with integrated protection features including over-current, over-temperature, and short-circuit protection.

Substiute Parts

LP3856ES-5.0

Texas InstrumentsIn Stock: 4939LP3856ES-5.0 Datasheet

Current PartRFQ

LP3856ES-5.0/NOPB

Texas InstrumentsIn Stock: 1054LP3856ES-5.0/NOPB Datasheet

DirectRFQ

LP3853ES-5.0/NOPB

Texas InstrumentsIn Stock: 2308LP3853ES-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3873ES-5.0/NOPB

Texas InstrumentsIn Stock: 2397LP3873ES-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ES-5.0/NOPB

Texas InstrumentsIn Stock: 857LP3876ES-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3856ES-5.0 is determined by the following critical parameters: output voltage (5V fixed), output current capacity (3A), package type (TO-263 DDPAK-5), input voltage rating (7V maximum), and protection feature set. All identified substitute parts maintain identical output voltage, current capacity, package configuration, and input voltage specifications. Variations exist in voltage dropout characteristics and quiescent current consumption, which define the substitution categories.

The substitute parts are grouped as follows:

Direct Equivalent: LP3856ES-5.0/NOPB maintains identical electrical specifications to the main part with the addition of RoHS3 compliance and active product status.

Parametric Equivalents: LP3853ES-5.0/NOPB, LP3873ES-5.0/NOPB, and LP3876ES-5.0/NOPB share the core output voltage, current capacity, and package specifications but differ in voltage dropout and quiescent current parameters.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, LP3856ES-5.0/NOPB is the primary selection as it provides direct electrical equivalence to the obsolete LP3856ES-5.0 while offering active product status and RoHS3 compliance. This part eliminates the need for circuit redesign or thermal management adjustments.

LP3853ES-5.0/NOPB serves as an alternative direct equivalent with identical electrical performance and active status, suitable for applications where supply chain flexibility is required.

LP3873ES-5.0/NOPB and LP3876ES-5.0/NOPB are parametric equivalents applicable only to designs where increased voltage dropout (1.2V @ 3A) and higher quiescent current are acceptable. These parts require thermal analysis verification to confirm adequate heat dissipation in the target application, as the increased dropout voltage generates additional power loss.

All substitute parts maintain identical package configuration (TO-263 DDPAK-5), protection features, and operating temperature range, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management solutions.

Frequently Asked Questions (FAQ)

Q: Can LP3856ES-5.0/NOPB be used as a direct replacement for LP3856ES-5.0?

A: Yes. LP3856ES-5.0/NOPB is electrically identical to LP3856ES-5.0 with the addition of RoHS3 compliance and active product status. No circuit modifications are required.

Q: What is the difference between LP3856ES-5.0/NOPB and LP3873ES-5.0/NOPB?

A: The primary differences are voltage dropout (0.6V versus 1.2V @ 3A) and quiescent current (4 mA versus 9 mA). LP3873ES-5.0/NOPB generates approximately 1.8W additional power dissipation at maximum load due to increased dropout voltage. Circuit thermal analysis is required before substitution.

Q: Are all substitute parts compatible with existing PCB layouts?

A: Yes. All substitute parts use the identical TO-263 (DDPAK-5) package configuration, ensuring mechanical and electrical compatibility with existing PCB designs without layout modifications.

Q: Which substitute part should be selected for applications requiring minimum power dissipation?

A: LP3856ES-5.0/NOPB or LP3853ES-5.0/NOPB are optimal for minimum power dissipation applications, as both maintain the 0.6V dropout voltage specification of the original part.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (LP3856ES-5.0/NOPB, LP3853ES-5.0/NOPB, LP3873ES-5.0/NOPB, and LP3876ES-5.0/NOPB) are ROHS3 compliant. The original LP3856ES-5.0 is RoHS non-compliant.