LP3873ES-3.3 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP3873ES-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 3.3V linear regulation with 3A output capacity.

Substiute Parts

LP3873ES-3.3

Texas InstrumentsIn Stock: 2112LP3873ES-3.3 Datasheet

Current PartRFQ

LP3873ES-3.3/NOPB

Texas InstrumentsIn Stock: 3287LP3873ES-3.3/NOPB Datasheet

DirectRFQ

LP3853ES-3.3/NOPB

Texas InstrumentsIn Stock: 1379LP3853ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3856ES-3.3/NOPB

Texas InstrumentsIn Stock: 1149LP3856ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ES-3.3/NOPB

Texas InstrumentsIn Stock: 6570LP3876ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3963ES-3.3/NOPB

Texas InstrumentsIn Stock: 1286LP3963ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3966ES-3.3/NOPB

Texas InstrumentsIn Stock: 2190LP3966ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3963ES-3.3

Texas InstrumentsIn Stock: 1527LP3963ES-3.3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3873ES-3.3 are classified based on strict electrical and mechanical parameter alignment:

Direct Equivalent (Identical Electrical Performance):

• LP3873ES-3.3/NOPB: Identical specifications with active product status and tube packaging

Parametric Equivalents (Core Function Preserved with Parameter Variations): Substitutes are qualified when they maintain the following critical parameters:

• Fixed 3.3V output voltage
• 3A maximum output current
• TO-263 (DDPAK-5) package compatibility
• -40°C to 125°C operating temperature range
• Enable control feature
• Over Current, Over Temperature, and Short Circuit protection

Variations in the following parameters are permitted within the substitute group:

• Voltage dropout (0.6V to 1.2V @ 3A)
• Quiescent current (4 mA to 9 mA)
• Supply current maximum (10 mA to 15 mA)
• PSRR specification (present or not specified)

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Active Supply Chain Requirements: Select LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, or LP3966ES-3.3/NOPB. All are active product status from Texas Instruments with ROHS3 compliance and established inventory levels. LP3876ES-3.3/NOPB offers the highest current inventory (6460 Pcs) and reduced quiescent current (5 mA), providing supply security and improved power efficiency.

For Applications Prioritizing Lower Dropout Voltage: LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB feature 0.6V dropout voltage at 3A, compared to 1.2V in the main part. These are suitable for designs with tighter input voltage margins or lower input supply headroom. Both maintain active product status and full protection features.

For End-of-Life Mitigation: The main part LP3873ES-3.3 and LP3963ES-3.3 are both Last Time Buy status. Transition to active equivalents immediately. LP3873ES-3.3/NOPB is the direct equivalent with identical electrical specifications and active status.

All substitute parts maintain identical output voltage (3.3V), output current (3A), package type (TO-263 DDPAK-5), operating temperature range (-40°C to 125°C), and protection features (Over Current, Over Temperature, Short Circuit). All are ROHS3 compliant and suitable for direct PCB replacement.

Frequently Asked Questions (FAQ)

Q: Can LP3853ES-3.3/NOPB replace LP3873ES-3.3 directly on the PCB? A: Yes. Both parts use identical TO-263 (DDPAK-5) packaging and pinout. LP3853ES-3.3/NOPB delivers the same 3.3V output at 3A with lower dropout voltage (0.6V vs 1.2V) and reduced quiescent current (4 mA vs 9 mA), making it a compatible substitute with improved efficiency characteristics.

Q: What is the difference between LP3873ES-3.3 and LP3873ES-3.3/NOPB? A: Both parts are electrically identical with matching specifications. The primary difference is product status: LP3873ES-3.3 is Last Time Buy, while LP3873ES-3.3/NOPB is Active. The /NOPB designation indicates lead-free solder ball packaging. For new designs, use LP3873ES-3.3/NOPB to ensure continued supply availability.

Q: Are all substitute parts in the same package? A: Yes. All listed substitute parts use TO-263 (DDPAK-5) surface mount packaging with identical pinout and thermal characteristics. No PCB layout modifications are required for substitution.

Q: Which substitute offers the best power efficiency? A: LP3853ES-3.3/NOPB and LP3856ES-3.3/NOPB feature the lowest quiescent current (4 mA) and dropout voltage (0.6V @ 3A), resulting in reduced power dissipation and improved thermal performance in battery-powered or power-constrained applications.

Q: What is the significance of Last Time Buy status? A: Last Time Buy indicates the manufacturer will discontinue production. Existing inventory will be depleted without replenishment. For designs using LP3873ES-3.3 or LP3963ES-3.3, transition to active equivalents (LP3873ES-3.3/NOPB, LP3876ES-3.3/NOPB, LP3963ES-3.3/NOPB, or LP3966ES-3.3/NOPB) to maintain long-term supply chain continuity.

Q: Do all parts meet the same compliance standards? A: Yes. All listed parts are ROHS3 compliant and carry identical protection features (Over Current, Over Temperature, Short Circuit). All operate across the -40°C to 125°C temperature range with Enable control functionality.