LP3961ES-2.5 Equivalent & Substitute Parts

Part Overview

The LP3961ES-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 in a TO-263 (DDPAK-5) surface mount package. The device includes integrated protection features for over-current, over-temperature, and short-circuit conditions, with an enable control feature for power management applications.

The LP3961ES-2.5 carries a "Not For New Designs" product status, indicating it is obsolete or in end-of-life phase. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9mA (typical)
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263-6 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3961ES-2.5 are classified based on electrical and mechanical compatibility. The primary substitution criteria are:

Electrical Parameters (Must Match):

Fixed output voltage: 2.5V
Output current rating: 800mA
Maximum input voltage: 7V
Voltage dropout: 0.35V @ 800mA
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Control features: Enable function

Mechanical Parameters (Must Match):

Package type: TO-263-6 (DDPAK-5)
Mounting type: Surface Mount
Pin configuration: 5 Leads + Tab

All identified substitutes meet these core requirements. Variations in quiescent current (Iq) and PSRR specifications do not prevent functional substitution, as these represent performance enhancements rather than compatibility barriers.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Iq (mA)	Package	Product Status	RoHS Status
LP3961ES-2.5	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	TO-263-6	Not For New Designs	RoHS Non-Compliant
LP3961ES-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	TO-263-6	Active	RoHS3 Compliant
LP3871ES-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	5	TO-263-6	Active	RoHS3 Compliant
LP3874ES-2.5/NOPB	National Semiconductor	2.5V	800mA	7V	0.35V @ 800mA	9	TO-263-6	Active	Not Specified
LP3964ES-2.5/NOPB	Texas Instruments	2.5V	800mA	7V	0.35V @ 800mA	9	TO-263-6	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LP3961ES-2.5/NOPB

The LP3961ES-2.5/NOPB is the direct equivalent of the obsolete LP3961ES-2.5. It maintains identical electrical specifications and package configuration while offering Active product status and RoHS3 compliance. This part provides the most straightforward replacement path with 5099 units in stock.

Secondary Recommendations: LP3871ES-2.5/NOPB and LP3964ES-2.5/NOPB

Both parts are parametric equivalents with Active product status and RoHS3 compliance. LP3871ES-2.5/NOPB offers improved quiescent current performance (5mA vs. 9mA), reducing standby power consumption. LP3964ES-2.5/NOPB maintains identical quiescent current specifications to the original part. Both are suitable for new designs and existing production support.

Alternative: LP3874ES-2.5/NOPB

The LP3874ES-2.5/NOPB from National Semiconductor meets all electrical and mechanical requirements. It carries Active product status and includes PSRR specification (73dB ~ 57dB at 120Hz). RoHS compliance status is not specified for this part. Inventory availability is 1264 units.

All substitute parts share identical TO-263-6 package configuration, enabling direct PCB-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP3961ES-2.5/NOPB be used as a direct replacement for LP3961ES-2.5?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (Active vs. Not For New Designs) and RoHS compliance (RoHS3 vs. Non-Compliant). The /NOPB variant is recommended for new designs and ongoing production.

Q: What is the difference between LP3871ES-2.5/NOPB and LP3961ES-2.5?

A: The LP3871ES-2.5/NOPB is a parametric equivalent with identical output voltage, current rating, and package configuration. The key difference is quiescent current: LP3871ES-2.5/NOPB draws 5mA compared to 9mA for the LP3961ES-2.5. This makes LP3871ES-2.5/NOPB more suitable for battery-powered or low-power standby applications.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263-6 (DDPAK-5) surface mount package with identical pin configuration. Direct PCB replacement is possible without layout changes.

Q: Can LP3874ES-2.5/NOPB from National Semiconductor be used interchangeably?

A: Yes. The LP3874ES-2.5/NOPB meets all electrical specifications and uses the same TO-263-6 package. It is a valid substitute, though it is manufactured by National Semiconductor rather than Texas Instruments. Verify RoHS compliance requirements for your application, as this specification is not provided for this part.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from parts with Active product status and confirmed RoHS3 compliance: LP3961ES-2.5/NOPB, LP3871ES-2.5/NOPB, or LP3964ES-2.5/NOPB. Choose LP3871ES-2.5/NOPB if reduced quiescent current is a design requirement.

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

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS3 compliance. Parts without this designation may contain lead and may not meet current environmental regulations.

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