LP3964EMP-1.8 Equivalent & Substitute Parts

Part Overview

The LP3964EMP-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 800mA at 1.8V with a maximum dropout voltage of 0.35V at full load current. The device integrates over-current, over-temperature, and short-circuit protection, making it suitable for low-voltage power supply applications requiring stable regulation and thermal management.

The LP3964EMP-1.8 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this regulator.

Substiute Parts

LP3964EMP-1.8

Texas InstrumentsIn Stock: 3469LP3964EMP-1.8 Datasheet

Current PartRFQ

LP3871EMP-1.8/NOPB

National SemiconductorIn Stock: 3603LP3871EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMP-1.8/NOPB

National SemiconductorIn Stock: 3337LP3874EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3874EMPX-1.8/NOPB

Texas InstrumentsIn Stock: 4235LP3874EMPX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMP-1.8/NOPB

National SemiconductorIn Stock: 2885LP3961EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3961EMPX-1.8/NOPB

Texas InstrumentsIn Stock: 821LP3961EMPX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP3964EMP-1.8/NOPB

Texas InstrumentsIn Stock: 1375LP3964EMP-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3964EMP-1.8 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Output voltage: 1.8V fixed
• Output current capability: 800mA
• Maximum input voltage: 7V
• Dropout voltage: 0.35V @ 800mA
• Operating temperature range: -40°C to 125°C
• Package type: SOT-223-5 (TO-261-5, TO-261AB)
• Output configuration: Positive fixed
• Protection features: Over Current, Over Temperature, Short Circuit
• Control features: Enable function

All identified substitute parts meet these electrical specifications. Variations in quiescent current (5mA vs 9mA), PSRR specifications, and product status (Active vs Obsolete) are noted but do not disqualify substitution when other parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP3964EMP-1.8/NOPB

The LP3964EMP-1.8/NOPB is the direct active equivalent of the obsolete LP3964EMP-1.8. This part maintains identical electrical specifications, package type (SOT-223-5), and quiescent current characteristics. The /NOPB suffix indicates RoHS3 compliance and lead-free construction. This part is currently in active production status with 1267 units in stock.

Secondary Recommendations (Texas Instruments, SOT-223-5 Package):

LP3874EMPX-1.8/NOPB and LP3961EMPX-1.8/NOPB are Texas Instruments alternatives in the same SOT-223-5 package with identical electrical performance. Both are RoHS3 compliant and in active production. LP3874EMPX-1.8/NOPB offers the highest inventory availability (4200 units).

Alternative Recommendations (National Semiconductor, SOT-223 Package):

LP3871EMP-1.8/NOPB, LP3874EMP-1.8/NOPB, and LP3961EMP-1.8/NOPB are National Semiconductor equivalents with identical electrical specifications. These parts use the SOT-223 package variant rather than SOT-223-5. PCB layout modifications may be required to accommodate package differences. All three are in active production.

Compliance Considerations:

The original LP3964EMP-1.8 is RoHS non-compliant. All substitute parts listed are RoHS3 compliant, meeting current regulatory requirements for new designs and production runs. All parts carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LP3964EMP-1.8/NOPB directly replace the obsolete LP3964EMP-1.8?

A: Yes. The LP3964EMP-1.8/NOPB is the direct active equivalent with identical electrical specifications, package type, and performance characteristics. The primary difference is RoHS3 compliance in the newer version.

Q: What is the difference between SOT-223 and SOT-223-5 packages?

A: Both are surface-mount packages with five leads. SOT-223-5 and TO-261-5 are equivalent designations. National Semiconductor parts use SOT-223 designation while Texas Instruments parts use SOT-223-5. Physical dimensions and pin configurations are compatible, though PCB footprints should be verified during layout.

Q: Are the National Semiconductor LP3871, LP3874, and LP3961 series interchangeable with Texas Instruments LP3964 and LP3874?

A: Yes, within the constraints of package type. All parts meet the same electrical specifications for output voltage, current, dropout voltage, and operating temperature. National Semiconductor parts (SOT-223) and Texas Instruments parts (SOT-223-5) are mechanically compatible but may require footprint verification.

Q: Why does LP3871EMP-1.8/NOPB have a lower quiescent current (5mA vs 9mA)?

A: LP3871 is a different device variant within the LP39xx regulator family. The lower quiescent current represents improved power efficiency in standby conditions. This does not affect substitution eligibility, as the part meets all other critical electrical parameters.

Q: Which substitute part has the best inventory availability?

A: LP3874EMPX-1.8/NOPB from Texas Instruments offers the highest inventory with 4200 units in stock, followed by LP3871EMP-1.8/NOPB with 3550 units.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are RoHS3 compliant. The original LP3964EMP-1.8 is RoHS non-compliant, making the newer equivalents suitable for designs requiring regulatory compliance.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB suffix indicates the part is manufactured without lead (Pb) and is RoHS3 compliant. This is standard for current production parts and required for most new designs and applications.