LP3964EMPX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3964EMPX-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 2.5V output at 800mA in a SOT-223-5 surface mount package. The main part is currently listed as obsolete, making equivalent substitute parts essential for ongoing design support and production continuity. Alternative models within the LP39xx series provide functional equivalence while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current	9mA
Package Type	SOT-223-5
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP3964EMPX-2.5 is determined by strict parametric matching across the following criteria:

Fixed output voltage of 2.5V
Output current rating of 800mA
Maximum input voltage of 7V
Dropout voltage of 0.35V @ 800mA
SOT-223-5 package configuration
Operating temperature range of -40°C to 125°C
Presence of Enable control feature
Inclusion of Over Current, Over Temperature, and Short Circuit protection

All substitute parts listed below meet these electrical and mechanical specifications. Differences in product status, RoHS compliance, and quiescent current are noted but do not affect functional substitution within the specified parameter set.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP3964EMPX-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Obsolete	RoHS non-compliant
LP3871EMP-2.5/NOPB	National Semiconductor	2.5V	800mA	7V	0.35V @ 800mA	5mA	SOT-223	Active	Not specified
LP3874EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Active	ROHS3 Compliant
LP3961EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Last Time Buy	ROHS3 Compliant
LP3961EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Active	ROHS3 Compliant
LP3964EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Active	ROHS3 Compliant
LP3964EMPX-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9mA	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production continuity, LP3964EMPX-2.5/NOPB is the direct equivalent with Active product status and ROHS3 compliance. This part maintains identical electrical specifications and packaging while offering improved regulatory compliance compared to the obsolete main part.

LP3874EMP-2.5/NOPB and LP3961EMP-2.5/NOPB provide equivalent functionality with Active status and ROHS3 compliance. Both are suitable for applications requiring regulatory compliance and long-term availability.

LP3961EMP-2.5 carries Last Time Buy status, indicating limited future availability. Use of this part should be restricted to applications where existing inventory is being consumed.

LP3871EMP-2.5/NOPB, manufactured by National Semiconductor, meets all parametric requirements with the advantage of lower quiescent current (5mA versus 9mA). This part is Active and suitable for power-sensitive applications, though RoHS compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can LP3964EMPX-2.5/NOPB directly replace LP3964EMPX-2.5?

A: Yes. Both parts share identical electrical specifications (2.5V output, 800mA current, 0.35V dropout), package configuration (SOT-223-5), and operating temperature range (-40°C to 125°C). The primary difference is product status and RoHS compliance. LP3964EMPX-2.5/NOPB is Active and ROHS3 compliant, making it the recommended choice for new applications.

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

A: The /NOPB designation indicates the part is supplied without lead-free plating on the leads. This is a packaging specification that does not affect electrical functionality or substitution eligibility.

Q: Why does LP3871EMP-2.5/NOPB have lower quiescent current?

A: LP3871EMP-2.5/NOPB is specified with 5mA quiescent current compared to 9mA for other parts in this group. This represents a design difference in the LP3871 series but does not affect substitution compatibility. The lower quiescent current may provide advantages in battery-powered or low-power standby applications.

Q: Are there package differences between SOT-223 and SOT-223-5?

A: Both designations refer to the same 5-pin surface mount package. SOT-223-5 is the more explicit notation. All parts in this substitution group use identical package footprints and pin configurations.

Q: What is the difference between LP3961EMP-2.5 and LP3961EMP-2.5/NOPB?

A: Both parts are electrically identical with matching specifications. LP3961EMP-2.5/NOPB is Active, while LP3961EMP-2.5 carries Last Time Buy status. For new designs, LP3961EMP-2.5/NOPB is the preferred choice due to ongoing availability.

Q: Can I use these substitutes in existing PCB designs without layout changes?

A: Yes. All substitute parts use the SOT-223-5 package with identical pin assignments and footprints. No PCB layout modifications are required for substitution.

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