LP3964EMP-3.3 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP3964EMP-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 800mA current capacity in SOT-223-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives from Texas Instruments provide identical electrical performance with improved product status and compliance certifications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9mA
Package Type	SOT-223-5
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964EMP-3.3 is determined by the following critical parameters:

Output voltage fixed at 3.3V
Output current capacity of 800mA
Maximum input voltage of 7V
Voltage dropout specification of 0.35V @ 800mA
SOT-223-5 package compatibility
Enable control feature
Over current, over temperature, and short circuit protection

All identified substitute parts meet these core electrical and mechanical requirements. Variations in quiescent current (5mA vs 9mA) and PSRR specifications do not affect substitution eligibility for this product category. Packaging format differences (Tape & Reel, Cut Tape, Digi-Reel) represent logistics variations only and do not impact electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Iq (mA)	Dropout @ 800mA	Package	RoHS Status	Inventory
LP3964EMP-3.3	Texas Instruments	Obsolete	3.3V	800mA	9	0.35V	SOT-223-5	Non-compliant	1329 Pcs
LP3871EMP-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	5	0.35V	SOT-223-5	ROHS3 Compliant	1105 Pcs
LP3871EMPX-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	5	0.35V	SOT-223-5	ROHS3 Compliant	1222 Pcs
LP3874EMP-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	9	0.35V	SOT-223-5	ROHS3 Compliant	3400 Pcs
LP3874EMPX-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	9	0.35V	SOT-223-5	ROHS3 Compliant	2021 Pcs
LP3961EMP-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	9	0.35V	SOT-223-5	ROHS3 Compliant	51498 Pcs
LP3964EMP-3.3/NOPB	Texas Instruments	Active	3.3V	800mA	9	0.35V	SOT-223-5	ROHS3 Compliant	3274 Pcs

Engineering Selection Recommendations

For new designs and production transitions from the obsolete LP3964EMP-3.3, the following active alternatives are recommended based on product status and compliance certifications:

LP3961EMP-3.3/NOPB offers the highest inventory availability at 51,498 pieces and maintains identical electrical specifications including 9mA quiescent current matching the original part. This part carries ROHS3 compliance certification and active product status.

LP3874EMP-3.3/NOPB provides 3,400 pieces in inventory with matching quiescent current specifications and ROHS3 compliance. The Cut Tape and Digi-Reel packaging format supports both prototype and production volume requirements.

LP3871EMP-3.3/NOPB and LP3871EMPX-3.3/NOPB feature reduced quiescent current at 5mA, resulting in lower power consumption during standby conditions. Both variants carry ROHS3 compliance and active product status, with combined inventory of 2,327 pieces.

LP3964EMP-3.3/NOPB represents the direct active equivalent of the obsolete LP3964EMP-3.3, offering identical specifications with ROHS3 compliance upgrade and 3,274 pieces available inventory.

All substitute parts maintain identical output voltage, current capacity, dropout voltage, package type, and protection features required for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-3.3/NOPB replace LP3964EMP-3.3 in existing designs?

A: Yes. The LP3871EMP-3.3/NOPB meets all core electrical requirements: 3.3V fixed output, 800mA current capacity, 0.35V dropout at 800mA, and SOT-223-5 packaging. The reduced quiescent current of 5mA versus 9mA in the original part represents improved efficiency and does not affect compatibility.

Q: What is the difference between LP3874EMP-3.3/NOPB and LP3874EMPX-3.3/NOPB?

A: Both parts are electrically identical with matching 3.3V output, 800mA current, and 9mA quiescent current. The difference is packaging format: LP3874EMP-3.3/NOPB is supplied in Cut Tape and Digi-Reel format, while LP3874EMPX-3.3/NOPB is supplied in Tape & Reel format. Select based on procurement and assembly requirements.

Q: Why is LP3961EMP-3.3/NOPB recommended despite higher inventory?

A: LP3961EMP-3.3/NOPB maintains identical electrical specifications to the original LP3964EMP-3.3, including 9mA quiescent current. The significantly higher inventory level of 51,498 pieces ensures supply continuity and reduces procurement lead times for production volumes.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts carry ROHS3 compliance certification. The original LP3964EMP-3.3 is RoHS non-compliant. The active LP3964EMP-3.3/NOPB variant upgrades this to ROHS3 compliance while maintaining identical electrical performance.

Q: Can I use LP3871EMPX-3.3/NOPB in high-volume production?

A: Yes. LP3871EMPX-3.3/NOPB is supplied in Tape & Reel packaging suitable for automated assembly processes. With 1,222 pieces in inventory and active product status, it supports production requirements. The 5mA quiescent current provides power efficiency benefits in battery-powered applications.

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

A: The /NOPB suffix indicates lead-free, RoHS-compliant packaging without lead (Pb). This certification is standard across all active substitute parts and reflects current manufacturing and environmental compliance standards.

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