LP3891ES-1.2 Equivalent & Substitute Parts

Part Overview

The LP3891ES-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.2V at 800mA with a maximum dropout voltage of 0.4V. The device is housed in a TO-263 (DDPAK-5) surface mount package and includes integrated protection features for over-current, over-temperature, short-circuit, and under-voltage lockout conditions.

The main part (LP3891ES-1.2) carries a Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this voltage regulation specification.

Substiute Parts

LP3891ES-1.2

Texas InstrumentsIn Stock: 1424LP3891ES-1.2 Datasheet

Current PartRFQ

LP3891ES-1.2/NOPB

Texas InstrumentsIn Stock: 1975LP3891ES-1.2/NOPB Datasheet

DirectRFQ

LP3881ES-1.2/NOPB

Texas InstrumentsIn Stock: 933LP3881ES-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3891ES-1.2 are classified based on electrical and mechanical parameter compatibility:

Direct Manufacturer Equivalent: LP3891ES-1.2/NOPB maintains identical electrical specifications and package configuration. The "/NOPB" suffix indicates lead-free (Pb-free) compliance. This part is functionally interchangeable with the main part number.

Parametric Equivalent: LP3881ES-1.2/NOPB shares the same output voltage (1.2V), output current (800mA), input voltage rating (5.5V max), quiescent current (30 µA), operating temperature range (-40°C to 125°C), package type (TO-263 DDPAK-5), and protection features. The key difference is a lower maximum dropout voltage of 0.16V @ 800mA compared to 0.4V in the main part. This reduced dropout voltage represents an improvement in efficiency and thermal performance.

Substitution eligibility is determined by matching output voltage, output current capacity, input voltage rating, package type, and protection feature set. All listed substitutes meet these criteria.

Parameter Comparison

Engineering Selection Recommendations

LP3891ES-1.2/NOPB is the primary substitute for the discontinued LP3891ES-1.2. Both parts are manufactured by Texas Instruments with identical electrical and mechanical specifications. The /NOPB variant is currently in active production status with higher inventory availability (1900 pcs vs. 1407 pcs). This part is recommended for direct replacement in existing designs.

LP3881ES-1.2/NOPB is a parametric equivalent suitable for applications where improved efficiency is beneficial. The reduced dropout voltage (0.16V vs. 0.4V) results in lower power dissipation and reduced thermal load. This part is also in active production status. Selection of this part should be based on thermal or power budget requirements of the specific application.

Both substitute parts maintain ROHS3 compliance and identical protection feature sets, ensuring regulatory and functional compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can LP3891ES-1.2/NOPB be used as a direct replacement for LP3891ES-1.2?

A: Yes. LP3891ES-1.2/NOPB is electrically and mechanically identical to LP3891ES-1.2. The only difference is the lead-free (Pb-free) designation indicated by the /NOPB suffix. Both parts deliver 1.2V at 800mA with identical dropout voltage, quiescent current, and protection features.

Q: What is the difference between LP3891ES-1.2/NOPB and LP3881ES-1.2/NOPB?

A: The primary difference is dropout voltage. LP3891ES-1.2/NOPB has a maximum dropout of 0.4V @ 800mA, while LP3881ES-1.2/NOPB has a maximum dropout of 0.16V @ 800mA. All other electrical parameters, output voltage, output current, input voltage rating, quiescent current, operating temperature range, and protection features are identical. The lower dropout voltage of the LP3881 variant improves efficiency and reduces thermal dissipation.

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and mechanical dimensions. No PCB layout modifications are required for substitution.

Q: What protection features are included in these regulators?

A: All three parts include over-current protection (OCP), over-temperature protection (OTP), short-circuit protection (SCP), and under-voltage lockout (UVLO). These features provide comprehensive protection against fault conditions.

Q: Are these parts RoHS compliant?

A: Yes. All listed parts are ROHS3 compliant and lead-free (Pb-free), meeting current environmental and regulatory requirements.

Q: Which part should I select if the original LP3891ES-1.2 is unavailable?

A: LP3891ES-1.2/NOPB is the recommended first choice due to identical specifications and active production status. If thermal performance or power efficiency is a design concern, LP3881ES-1.2/NOPB offers improved dropout voltage characteristics while maintaining all other functional requirements.