LP3891EMR-1.8 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3891EMR-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 800mA current capacity. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The regulator integrates protection features including over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO) protection, making it suitable for stable power delivery in embedded systems and portable applications.

Substiute Parts

LP3891EMR-1.8

Texas InstrumentsIn Stock: 7959LP3891EMR-1.8 Datasheet

Current PartRFQ

LP3891EMR-1.8/NOPB

Texas InstrumentsIn Stock: 1167LP3891EMR-1.8/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3891EMR-1.8 is determined by strict equivalence across the following electrical and mechanical parameters:

• Fixed output voltage of 1.8V
• Output current rating of 800mA minimum
• Maximum input voltage of 5.5V or greater
• Voltage dropout specification of 0.43V @ 800mA or lower
• Identical package configuration: 8-PowerSOIC (0.154", 3.90mm Width)
• Presence of all four protection features: Over Current, Over Temperature, Short Circuit, and UVLO
• Operating temperature range of -40°C ~ 125°C or wider
• Surface mount mounting type

The LP3891EMR-1.8/NOPB meets all substitution criteria as a direct equivalent with identical electrical specifications and package footprint.

Parameter Comparison

Engineering Selection Recommendations

The LP3891EMR-1.8/NOPB is the direct functional equivalent for the obsolete LP3891EMR-1.8. Both parts share identical electrical specifications and package footprint, ensuring pin-for-pin compatibility and circuit-level interchangeability.

The primary distinction between these parts is product status and regulatory compliance. The LP3891EMR-1.8/NOPB carries Active product status with ROHS3 compliance, whereas the original LP3891EMR-1.8 is classified as Obsolete and RoHS non-compliant. For new designs and production applications requiring regulatory compliance, the LP3891EMR-1.8/NOPB is the appropriate selection. Both parts maintain identical REACH Unaffected and EAR99 ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can LP3891EMR-1.8/NOPB be used as a direct replacement for LP3891EMR-1.8?

A: Yes. Both parts are electrically and mechanically identical with matching output voltage (1.8V), output current (800mA), input voltage rating (5.5V max), dropout voltage (0.43V @ 800mA), and 8-PowerSOIC package footprint. Pin-for-pin substitution is valid.

Q: What is the difference between LP3891EMR-1.8 and LP3891EMR-1.8/NOPB?

A: The primary differences are product status and compliance. LP3891EMR-1.8/NOPB is Active and ROHS3 Compliant, while LP3891EMR-1.8 is Obsolete and RoHS non-compliant. Electrical and mechanical specifications are identical.

Q: Why is the original LP3891EMR-1.8 marked as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The LP3891EMR-1.8/NOPB represents the current active equivalent from Texas Instruments.

Q: Are there any package or footprint differences between these parts?

A: No. Both parts use the 8-PowerSOIC package with 0.154" width (3.90mm). PCB layout and component placement are identical.

Q: What protection features are included in both parts?

A: Both the LP3891EMR-1.8 and LP3891EMR-1.8/NOPB include over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO) protection.