LP3961EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3961EMP-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.5V at 800mA with a maximum dropout voltage of 0.35V. The device is housed in a SOT-223-5 surface mount package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. Currently marked as Last Time Buy status, identifying equivalent substitute parts is necessary to ensure design continuity and long-term component availability.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	2.5V
Voltage - Input (Max)	7V
Current - Output	800mA
Voltage Dropout (Max)	0.35V @ 800mA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-261-5, TO-261AB (SOT-223-5)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3961EMP-2.5 are qualified based on the following critical parameters that must match or remain within acceptable tolerances:

Fixed output voltage of 2.5V
Output current capability of 800mA
Maximum input voltage of 7V
Maximum dropout voltage of 0.35V @ 800mA
Operating temperature range of -40°C to 125°C
Surface mount package compatibility (SOT-223-5 or equivalent TO-261-5/TO-261AB)
Integrated protection features (over-current, over-temperature, short-circuit)
Enable control feature

All identified substitute parts meet these electrical and mechanical requirements. Variations in quiescent current, PSRR specifications, packaging format (Cut Tape vs. Tape & Reel), and manufacturer do not affect functional equivalence for this application.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Iq (mA)	Package	Product Status
LP3961EMP-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Last Time Buy
LP3871EMP-2.5/NOPB	National Semiconductor	2.5V	800mA	7V	0.35V @ 800mA	5	SOT-223	Active
LP3874EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active
LP3961EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active
LP3964EMP-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active
LP3964EMPX-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status with the exception of the main part LP3961EMP-2.5, which is designated Last Time Buy. For new designs or long-term production requirements, LP3874EMP-2.5/NOPB, LP3961EMP-2.5/NOPB, LP3964EMP-2.5/NOPB, and LP3964EMPX-2.5/NOPB are recommended as they are manufactured by Texas Instruments and carry Active status.

LP3871EMP-2.5/NOPB, manufactured by National Semiconductor, is functionally equivalent and offers improved quiescent current performance (5mA vs. 9mA). This part is suitable for applications where power consumption optimization is a secondary consideration.

All substitute parts comply with RoHS3 and REACH requirements with MSL rating of 1 (Unlimited). Packaging format differences (Cut Tape vs. Tape & Reel) do not affect electrical performance and should be selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3871EMP-2.5/NOPB replace LP3961EMP-2.5 in existing designs?

A: Yes. Both parts deliver 2.5V at 800mA with identical dropout voltage specifications and operating temperature range. The primary difference is quiescent current (5mA vs. 9mA) and manufacturer origin. Package compatibility is confirmed for SOT-223 footprints.

Q: What is the difference between LP3964EMP-2.5/NOPB and LP3964EMPX-2.5/NOPB?

A: Both parts are electrically identical with matching output voltage, current rating, and dropout specifications. The suffix variation indicates different packaging or tape configuration. Electrical performance and pin compatibility remain unchanged.

Q: Are there any compliance differences between substitute parts?

A: All substitute parts maintain RoHS3 compliance and REACH Unaffected status. MSL rating is 1 (Unlimited) across all variants, indicating no moisture sensitivity restrictions during storage or handling.

Q: Does packaging format (Cut Tape vs. Tape & Reel) affect substitution?

A: Packaging format does not affect electrical equivalence. Selection should be based on assembly process requirements and procurement logistics. All parts use identical SOT-223-5 or SOT-223 surface mount packages.

Q: Why is LP3961EMP-2.5 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number variant. Substitute parts with Active status should be evaluated for new designs to ensure long-term availability and supply chain continuity.

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