LP3891ES-1.5 Equivalent & Substitute Parts

Part Overview

The LP3891ES-1.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.5V output at 800mA in a TO-263 (DDPAK-5) surface mount package. The main part number LP3891ES-1.5 is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Active alternatives with identical or superior electrical characteristics are available from the same manufacturer.

Substiute Parts

LP3891ES-1.5

Texas InstrumentsIn Stock: 2232LP3891ES-1.5 Datasheet

Current PartRFQ

LP3891ES-1.5/NOPB

Texas InstrumentsIn Stock: 1281LP3891ES-1.5/NOPB Datasheet

DirectRFQ

LP3881ES-1.5/NOPB

Texas InstrumentsIn Stock: 1132LP3881ES-1.5/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3891ES-1.5 are classified based on strict electrical and mechanical parameter matching:

Direct Manufacturer Equivalent: LP3891ES-1.5/NOPB maintains identical electrical specifications and package configuration. The primary distinction is product status (active vs. obsolete) and RoHS compliance level (ROHS3 Compliant vs. RoHS non-compliant).

Parametric Equivalent: LP3881ES-1.5/NOPB shares all critical electrical parameters with the main part except for voltage dropout performance. The LP3881 series delivers superior dropout characteristics (0.16V @ 800mA versus 0.4V @ 800mA), while maintaining identical output voltage, current capacity, package type, and operating temperature range.

Substitution eligibility is determined by:

• Identical output voltage (1.5V fixed)
• Identical output current capability (800mA)
• Identical package and pinout (TO-263-6, D2PAK)
• Compatible operating temperature range (-40°C ~ 125°C)
• Matching control features (Enable) and protection features (Over Current, Over Temperature, Short Circuit, Under Voltage Lockout)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: LP3891ES-1.5/NOPB is the primary substitute for obsolete LP3891ES-1.5. Both parts deliver identical electrical performance and package configuration. LP3891ES-1.5/NOPB carries active product status and ROHS3 compliance, addressing regulatory requirements for new designs and production continuity.

For Enhanced Performance: LP3881ES-1.5/NOPB provides superior dropout voltage performance (0.16V @ 800mA versus 0.4V @ 800mA) while maintaining all other electrical and mechanical specifications. This alternative is suitable for applications requiring lower power dissipation or operation with reduced input-to-output voltage margins. LP3881ES-1.5/NOPB is active and ROHS3 compliant.

Compliance Considerations: Both substitute parts meet ROHS3 compliance and REACH unaffected status, supporting modern supply chain and regulatory requirements. The obsolete status of the main part number necessitates transition to an active equivalent for ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can LP3891ES-1.5/NOPB directly replace LP3891ES-1.5 in existing designs?

A: Yes. LP3891ES-1.5/NOPB is electrically and mechanically identical to LP3891ES-1.5. Both deliver 1.5V fixed output at 800mA in TO-263 packaging with identical dropout voltage, quiescent current, and protection features. The primary differences are product status (active vs. obsolete) and RoHS compliance level.

Q: What is the advantage of LP3881ES-1.5/NOPB over LP3891ES-1.5/NOPB?

A: LP3881ES-1.5/NOPB delivers lower dropout voltage (0.16V @ 800mA versus 0.4V @ 800mA). This reduces power dissipation and thermal load, particularly beneficial in applications with tight input-to-output voltage margins or high ambient temperatures. All other electrical and mechanical parameters remain identical.

Q: Are the packages identical between all three parts?

A: Yes. LP3891ES-1.5, LP3891ES-1.5/NOPB, and LP3881ES-1.5/NOPB all use TO-263-6 (D2PAK with 5 leads plus tab) surface mount packaging. PCB layouts and thermal management designs are directly compatible.

Q: What is the difference between LP3891ES-1.5 and LP3891ES-1.5/NOPB?

A: The "/NOPB" suffix indicates lead-free (no lead, no plumbum) packaging. LP3891ES-1.5/NOPB is ROHS3 compliant, while LP3891ES-1.5 is RoHS non-compliant. Electrical specifications and package dimensions are identical. LP3891ES-1.5/NOPB is the active production part.

Q: Can these parts be used interchangeably in high-temperature applications?

A: Yes. All three parts operate across the identical temperature range (-40°C ~ 125°C) with matching thermal characteristics and protection features (Over Temperature protection included). Thermal performance depends on PCB layout and heatsinking, not part selection.

Q: What is the moisture sensitivity level, and does it affect handling?

A: All three parts carry MSL 3 (168 Hours), indicating moderate moisture sensitivity. Standard ESD and moisture control procedures during storage and assembly are required. Parts must be stored in dry conditions and baked per IPC standards if exposed to humidity before reflow soldering.