LP3881ESX-1.2 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3881ESX-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 1.2V output at 800mA with a maximum dropout voltage of 0.16V at full load, housed in a TO-263 (DDPAK-5) surface mount package. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical performance characteristics and package compatibility to ensure direct board-level replacement without design modification.

Substiute Parts

LP3881ESX-1.2

Texas InstrumentsIn Stock: 4856LP3881ESX-1.2 Datasheet

Current PartRFQ

LP3881ESX-1.2/NOPB

National SemiconductorIn Stock: 1502LP3881ESX-1.2/NOPB Datasheet

DirectRFQ

LP3891ESX-1.2/NOPB

Texas InstrumentsIn Stock: 2850LP3891ESX-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3881ESX-1.2 are classified based on electrical parameter equivalence and package compatibility. The primary substitution criteria are:

• Fixed output voltage of 1.2V
• Output current rating of 800mA
• Maximum input voltage of 5.5V
• TO-263 (DDPAK-5) package configuration
• Identical protection feature set (Over Current, Over Temperature, Short Circuit, UVLO)
• Operating temperature range of -40°C to 125°C

Two substitute parts meet these criteria with variations in dropout voltage specification and product status.

Parameter Comparison

Engineering Selection Recommendations

LP3881ESX-1.2/NOPB (National Semiconductor) provides direct electrical equivalence with identical dropout voltage specification (0.16V @ 800mA) and maintains active product status, ensuring continued availability and manufacturing support. This part is the preferred direct substitute when dropout voltage performance is critical to circuit operation.

LP3891ESX-1.2/NOPB (Texas Instruments) offers parametric equivalence with all core electrical specifications matching the original part, with the exception of increased dropout voltage (0.4V @ 800mA). This part carries ROHS3 compliance certification and active product status. Selection of this part is appropriate for applications where the higher dropout voltage does not compromise system performance requirements. The Tape & Reel packaging format supports high-volume production environments.

Both substitute parts maintain identical protection features, quiescent current, PSRR characteristics, and operating temperature range as the original LP3881ESX-1.2.

Frequently Asked Questions (FAQ)

Q: Can LP3881ESX-1.2/NOPB be used as a direct replacement for LP3881ESX-1.2?

A: Yes. LP3881ESX-1.2/NOPB maintains identical electrical specifications including output voltage (1.2V), output current (800mA), dropout voltage (0.16V @ 800mA), and TO-263 package configuration. The part is manufactured by National Semiconductor and carries active product status.

Q: What is the key difference between LP3881ESX-1.2/NOPB and LP3891ESX-1.2/NOPB?

A: The primary difference is dropout voltage specification. LP3881ESX-1.2/NOPB maintains 0.16V dropout at 800mA, while LP3891ESX-1.2/NOPB specifies 0.4V dropout at the same current. Both parts deliver identical 1.2V output and 800mA current capacity. LP3891ESX-1.2/NOPB carries ROHS3 compliance and Tape & Reel packaging.

Q: Is the TO-263 (DDPAK-5) package identical across all three parts?

A: Yes. All three parts use the TO-263 (DDPAK-5) surface mount package with 5 leads plus tab configuration, ensuring mechanical and electrical compatibility on the PCB.

Q: Why is the original LP3881ESX-1.2 listed as obsolete?

A: The original part is obsolete, necessitating substitution with active alternatives. Both LP3881ESX-1.2/NOPB and LP3891ESX-1.2/NOPB maintain active product status and provide equivalent or parametrically equivalent performance.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. For applications requiring minimum dropout voltage performance, LP3881ESX-1.2/NOPB is recommended. For applications compatible with higher dropout voltage and requiring RoHS3 compliance, LP3891ESX-1.2/NOPB is suitable.

Q: Are there packaging format differences between the substitute parts?

A: Yes. LP3881ESX-1.2/NOPB is supplied in Bulk packaging, while LP3891ESX-1.2/NOPB is supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly process requirements.