LP3881ES-1.8 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3881ES-1.8 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 device provides regulated power with integrated protection features including over-current, over-temperature, short-circuit, and under-voltage lockout protection.

The LP3881ES-1.8 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this regulator.

Substiute Parts

LP3881ES-1.8

Texas InstrumentsIn Stock: 4304LP3881ES-1.8 Datasheet

Current PartRFQ

LP3881ES-1.8/NOPB

Texas InstrumentsIn Stock: 857LP3881ES-1.8/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3881ES-1.8 is determined by strict equivalence across the following critical parameters:

• Output voltage configuration: 1.8V fixed positive output
• Output current capacity: 800mA minimum
• Input voltage rating: 5.5V maximum
• Voltage dropout specification: 0.16V @ 800mA maximum
• Package type: TO-263 (DDPAK-5) surface mount
• Protection feature set: Over-current, over-temperature, short-circuit, and UVLO protection
• Operating temperature range: -40°C to 125°C minimum

Only parts meeting all these criteria across electrical and mechanical specifications qualify as direct substitutes. The LP3881ES-1.8/NOPB variant from Texas Instruments satisfies all substitution parameters while offering improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The LP3881ES-1.8/NOPB is the direct substitute for the obsolete LP3881ES-1.8. Both parts are electrically and mechanically identical across all specified parameters. The primary distinction lies in product lifecycle status and regulatory compliance:

The LP3881ES-1.8 is classified as obsolete, presenting supply continuity risk for new production and long-term support. The LP3881ES-1.8/NOPB maintains active product status from Texas Instruments, ensuring ongoing availability and manufacturer support.

The LP3881ES-1.8/NOPB achieves ROHS3 compliance and is REACH-affected, meeting current environmental and regulatory requirements. The original LP3881ES-1.8 is RoHS non-compliant, which may conflict with procurement policies or end-product regulatory obligations.

For new designs or production transitions, the LP3881ES-1.8/NOPB is the appropriate selection. For existing inventory management or legacy system support, the LP3881ES-1.8 remains functionally equivalent where regulatory constraints do not apply.

Frequently Asked Questions (FAQ)

Q: Are LP3881ES-1.8 and LP3881ES-1.8/NOPB electrically interchangeable?

A: Yes. Both parts deliver identical electrical performance across output voltage, current capacity, dropout voltage, quiescent current, protection features, and operating temperature range. Pin configuration and package type are identical.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates lead-free (Pb-free) manufacturing and packaging. This variant meets RoHS3 compliance requirements and is REACH-affected, distinguishing it from the non-compliant original part number.

Q: Can I use LP3881ES-1.8/NOPB as a direct replacement in existing PCB designs?

A: Yes. The LP3881ES-1.8/NOPB uses the identical TO-263 (DDPAK-5) package footprint, pin assignment, and electrical specifications. No PCB redesign or circuit modification is required.

Q: Why is the original LP3881ES-1.8 marked as obsolete?

A: Product obsolescence reflects Texas Instruments' lifecycle management. The LP3881ES-1.8/NOPB variant supersedes the original part, offering improved compliance status and active manufacturer support.

Q: What packaging options are available for these parts?

A: The LP3881ES-1.8 is supplied in standard packaging. The LP3881ES-1.8/NOPB is available in tube packaging. Both use the TO-263 (DDPAK-5) surface mount package type for component-level specifications.

Q: Are there inventory considerations when transitioning between these parts?

A: The LP3881ES-1.8 shows 4222 pieces in stock (obsolete status). The LP3881ES-1.8/NOPB shows 774 pieces in stock (active status). For production planning, the active part number offers better long-term supply assurance despite lower current inventory levels.