LP3856ES-1.8 Equivalent & Substitute Parts

Part Overview

The LP3856ES-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 3A in a TO-263 (DDPAK-5) surface mount package. The main part number LP3856ES-1.8 is currently obsolete, with 3,680 units in stock. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this voltage regulation topology and electrical performance.

Substiute Parts

LP3856ES-1.8

Texas InstrumentsIn Stock: 3764LP3856ES-1.8 Datasheet

Current PartRFQ

LP3856ES-1.8/NOPB

Texas InstrumentsIn Stock: 1111LP3856ES-1.8/NOPB Datasheet

DirectRFQ

LP3853ES-1.8/NOPB

Texas InstrumentsIn Stock: 1492LP3853ES-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3873ES-1.8/NOPB

Texas InstrumentsIn Stock: 887LP3873ES-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3876ES-1.8/NOPB

Texas InstrumentsIn Stock: 1615LP3876ES-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3966ES-1.8/NOPB

Texas InstrumentsIn Stock: 1265LP3966ES-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3856ES-1.8 are classified based on electrical and mechanical parameter compatibility within the allowed specifications for this product category:

Direct Manufacturer Equivalent: LP3856ES-1.8/NOPB maintains identical electrical specifications and packaging. This part is functionally interchangeable with the main part number and represents the active production variant with improved compliance status.

Parametric Equivalents: LP3853ES-1.8/NOPB, LP3873ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB share the same output voltage (1.8V), output current (3A), input voltage rating (7V max), package (TO-263 DDPAK-5), and operating temperature range (-40°C ~ 125°C). These parts differ in voltage dropout characteristics, quiescent current, and supply current specifications, which may affect performance in specific application contexts but remain within acceptable substitution parameters for the core voltage regulation function.

Key Parameters Determining Substitution:

• Fixed output voltage: 1.8V
• Output current capability: 3A
• Package type: TO-263 (DDPAK-5)
• Input voltage rating: 7V maximum
• Operating temperature range: -40°C ~ 125°C
• Control and protection features: Enable control, Over Current, Over Temperature, Short Circuit protection

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3856ES-1.8/NOPB is the direct equivalent with active product status and ROHS3 compliance. This part provides identical electrical performance to the obsolete main part number while offering improved regulatory compliance and current availability (1,017 units in stock).

Secondary Recommendations: LP3853ES-1.8/NOPB matches the electrical specifications of the main part exactly, including the lower 0.6V dropout voltage and 4 mA quiescent current. It is active, ROHS3 compliant, and has 1,403 units available.

Alternative Selections: LP3873ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB are suitable for applications where higher dropout voltage (1.2V) and increased quiescent current are acceptable. These parts are active and ROHS3 compliant. LP3876ES-1.8/NOPB offers a middle-ground quiescent current of 5 mA compared to the 9 mA of LP3873ES-1.8/NOPB and LP3966ES-1.8/NOPB.

Selection should be based on application requirements for dropout voltage performance and power consumption characteristics, combined with availability and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3856ES-1.8/NOPB be used as a direct replacement for LP3856ES-1.8?

A: Yes. LP3856ES-1.8/NOPB is the active production equivalent with identical electrical specifications, output voltage (1.8V), output current (3A), dropout voltage (0.6V @ 3A), and TO-263 (DDPAK-5) packaging. The primary differences are product status (Active vs. Obsolete) and improved RoHS compliance.

Q: What is the difference between LP3856ES-1.8/NOPB and LP3853ES-1.8/NOPB?

A: Both parts share identical electrical performance: 1.8V output, 3A current, 0.6V dropout, and 4 mA quiescent current. The difference lies in the base product number (LP3856 vs. LP3853), which may reflect different design generations or internal architecture, but electrical compatibility is maintained.

Q: When should I use LP3873ES-1.8/NOPB or LP3966ES-1.8/NOPB instead of LP3856ES-1.8/NOPB?

A: LP3873ES-1.8/NOPB and LP3966ES-1.8/NOPB feature higher dropout voltage (1.2V vs. 0.6V) and increased quiescent current (9 mA vs. 4 mA). These parts are suitable for applications where the higher dropout voltage is acceptable and where the increased quiescent current does not impact overall system power budget. Use these alternatives only if LP3856ES-1.8/NOPB or LP3853ES-1.8/NOPB are unavailable.

Q: Is LP3876ES-1.8/NOPB a better choice than LP3873ES-1.8/NOPB?

A: LP3876ES-1.8/NOPB offers lower quiescent current (5 mA vs. 9 mA) while maintaining the same 1.2V dropout voltage and 3A output current. For power-sensitive applications, LP3876ES-1.8/NOPB may be preferable. Both are active and ROHS3 compliant.

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

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

Q: What compliance certifications apply to these substitute parts?

A: LP3856ES-1.8/NOPB, LP3853ES-1.8/NOPB, LP3873ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB are all ROHS3 compliant. The original LP3856ES-1.8 is RoHS non-compliant. REACH status varies: LP3856ES-1.8/NOPB is REACH Affected; LP3853ES-1.8/NOPB, LP3873ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB are REACH Unaffected.