LP3961ES-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3961ES-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 800mA current capacity in a TO-263 (DDPAK-5) surface mount package. The main part number LP3961ES-3.3 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain identical electrical specifications and mechanical compatibility while offering active product status and improved compliance certifications.

Substiute Parts

LP3961ES-3.3

Texas InstrumentsIn Stock: 1563LP3961ES-3.3 Datasheet

Current PartRFQ

LP3961ES-3.3/NOPB

Texas InstrumentsIn Stock: 4086LP3961ES-3.3/NOPB Datasheet

DirectRFQ

LP3874ES-3.3/NOPB

Texas InstrumentsIn Stock: 849LP3874ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3964ES-3.3/NOPB

Texas InstrumentsIn Stock: 1144LP3964ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP3871ES-3.3/NOPB

Texas InstrumentsIn Stock: 1191LP3871ES-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3961ES-3.3 are grouped based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical output voltage (3.3V), output current (800mA), input voltage rating (7V max), voltage dropout specification (0.35V @ 800mA), package type (TO-263-6), mounting type (surface mount), operating temperature range (-40°C to 125°C), and protection features (over current, over temperature, short circuit).

The key parameters determining substitution eligibility are:

• Fixed output voltage of 3.3V
• 800mA output current capacity
• TO-263 (DDPAK-5) package compatibility
• Identical dropout voltage specification
• Matching protection and control features

Variations exist in quiescent current (Iq) specifications and PSRR performance, which are documented in the parameter comparison table. Product status and compliance certifications differ between the main part and substitutes, with all active substitutes offering ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts are active products from Texas Instruments with ROHS3 compliance certification, making them suitable for new designs and production applications. The LP3961ES-3.3/NOPB provides direct equivalence to the obsolete main part with identical electrical specifications and active product status.

For applications requiring reduced quiescent current consumption, the LP3871ES-3.3/NOPB offers 5mA Iq compared to the standard 9mA specification, along with documented PSRR performance of 73dB ~ 57dB at 120Hz. The LP3874ES-3.3/NOPB also provides PSRR specification (73dB ~ 57dB at 120Hz) for noise-sensitive applications.

The LP3964ES-3.3/NOPB maintains standard quiescent current and dropout specifications without PSRR documentation. All substitute parts are available in active inventory with ROHS3 compliance and identical TO-263 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3961ES-3.3/NOPB directly replace the obsolete LP3961ES-3.3?

A: Yes. The LP3961ES-3.3/NOPB is the direct equivalent with identical electrical specifications (3.3V output, 800mA current, 0.35V dropout), identical package type (TO-263-6), and active product status. The primary difference is ROHS3 compliance certification.

Q: What is the difference between LP3871ES-3.3/NOPB and other substitutes?

A: The LP3871ES-3.3/NOPB features reduced quiescent current of 5mA compared to 9mA in other substitutes, and includes documented PSRR performance of 73dB ~ 57dB at 120Hz. This makes it suitable for low-power and noise-sensitive applications.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263-6 (D2PAK with 5 Leads + Tab) surface mount package, ensuring mechanical and thermal compatibility with the original LP3961ES-3.3 design.

Q: What compliance certifications apply to the substitute parts?

A: All substitute parts are ROHS3 compliant. The LP3961ES-3.3/NOPB and LP3871ES-3.3/NOPB are REACH Affected. The LP3874ES-3.3/NOPB and LP3964ES-3.3/NOPB are REACH Unaffected.

Q: Can I use LP3874ES-3.3/NOPB or LP3964ES-3.3/NOPB if PSRR performance is not specified in my design?

A: Yes. Both parts maintain identical output voltage, current, dropout voltage, and protection features. LP3874ES-3.3/NOPB provides documented PSRR if noise performance becomes a design requirement.