LP3891ES-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP3891ES-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 800mA current capacity in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing production and design continuity. The LP3891ES-1.8/NOPB provides regulated 1.8V output with integrated protection features including over-current, over-temperature, short-circuit, and under-voltage lockout protection.

Substiute Parts

LP3891ES-1.8/NOPB

Texas InstrumentsIn Stock: 1047LP3891ES-1.8/NOPB Datasheet

Current PartRFQ

LP3881ES-1.8/NOPB

Texas InstrumentsIn Stock: 857LP3881ES-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3891ES-1.8/NOPB is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 1.8V
• Minimum output current rating of 800mA
• Maximum input voltage of 5.5V or greater
• Identical package type: TO-263 (DDPAK-5)
• Positive output configuration with single regulator
• Presence of enable control feature
• Comprehensive protection features (over-current, over-temperature, short-circuit, UVLO)
• Operating temperature range of -40°C to 125°C or wider

The LP3881ES-1.8/NOPB meets all substitution criteria as a parametric equivalent with identical electrical specifications and package configuration.

Parameter Comparison

Engineering Selection Recommendations

The LP3881ES-1.8/NOPB is the direct substitute for the obsolete LP3891ES-1.8/NOPB. Both parts are manufactured by Texas Instruments and share identical electrical specifications, output voltage, current capacity, and package configuration. The LP3881ES-1.8/NOPB carries active product status, ensuring ongoing availability and support.

The LP3881ES-1.8/NOPB demonstrates superior dropout voltage performance at 0.16V compared to 0.4V in the LP3891ES-1.8/NOPB, providing improved efficiency in applications with tight input-to-output voltage margins. Both parts maintain ROHS3 compliance and identical operating temperature ranges. The LP3881ES-1.8/NOPB is available in tube packaging with confirmed inventory stock.

Frequently Asked Questions (FAQ)

Q: Can the LP3881ES-1.8/NOPB directly replace the LP3891ES-1.8/NOPB in existing designs?

A: Yes. Both parts share identical output voltage (1.8V), output current (800mA), input voltage rating (5.5V max), package type (TO-263 DDPAK-5), and protection features. Pin-to-pin compatibility and electrical performance are equivalent for standard applications.

Q: What is the primary difference between these two parts?

A: The LP3881ES-1.8/NOPB features lower dropout voltage (0.16V @ 800mA) compared to the LP3891ES-1.8/NOPB (0.4V @ 800mA). This improvement reduces power dissipation and heat generation in applications operating near the minimum input voltage threshold.

Q: Are there packaging differences between the LP3891ES-1.8/NOPB and LP3881ES-1.8/NOPB?

A: Both parts use identical TO-263 (DDPAK-5) surface mount packaging. The LP3881ES-1.8/NOPB is supplied in tube packaging, while the LP3891ES-1.8/NOPB packaging specification was not provided in the original documentation.

Q: What is the significance of the LP3891ES-1.8/NOPB being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Texas Instruments. The LP3881ES-1.8/NOPB, with active product status, is the recommended alternative for new designs and ongoing production requirements.

Q: Are both parts RoHS compliant?

A: Yes. Both the LP3891ES-1.8/NOPB and LP3881ES-1.8/NOPB are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and distribution.