LP3874ES-2.5 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP3874ES-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 TO-263 (DDPAK-5) surface mount package. The main part is currently listed as obsolete, making equivalent substitute parts essential for ongoing design support and production continuity. Substitute parts maintain identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

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)
Supply Current (Max)	15mA
PSRR	73dB ~ 57dB (120Hz)
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263-6 (D2PAK, 5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3874ES-2.5 are classified based on electrical and mechanical parameter equivalence. All substitute parts maintain the following critical specifications:

Fixed output voltage of 2.5V
Output current rating of 800mA
Maximum input voltage of 7V
Voltage dropout of 0.35V @ 800mA
TO-263 (DDPAK-5) package compatibility
Identical pin configuration and thermal characteristics
Equivalent protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature
Operating temperature range of -40°C to 125°C

Substitutes are grouped as direct manufacturer equivalents and parametric equivalents. Direct equivalents share identical part numbering conventions and manufacturer specifications. Parametric equivalents maintain all critical electrical performance parameters while potentially differing in secondary characteristics such as quiescent current or PSRR specifications where not explicitly required for the application.

Parameter Comparison

Parameter	LP3874ES-2.5	LP3874ES-2.5/NOPB	LP3871ES-2.5/NOPB	LP3961ES-2.5/NOPB	LP3964ES-2.5/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Output Voltage	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V	7V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current (Iq)	9mA	9mA	5mA	9mA	9mA
Supply Current (Max)	15mA	15mA	15mA	15mA	15mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified	Not specified
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)	TO-263-6 (DDPAK-5)
RoHS Status	Non-compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	Not specified	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For applications currently using the obsolete LP3874ES-2.5, the following selection criteria apply:

LP3874ES-2.5/NOPB (National Semiconductor): This direct equivalent maintains all electrical specifications and TO-263 package compatibility. Product status is active, ensuring long-term availability. Selection is appropriate for designs requiring immediate substitution with minimal qualification effort.

LP3871ES-2.5/NOPB (Texas Instruments): This parametric equivalent offers improved quiescent current performance at 5mA versus 9mA, reducing standby power consumption. ROHS3 compliance and active product status support modern supply chain requirements. Suitable for applications where lower quiescent current provides design benefits.

LP3961ES-2.5/NOPB (Texas Instruments): This parametric equivalent maintains standard quiescent current specifications with ROHS3 compliance and active product status. Appropriate for designs requiring RoHS-compliant alternatives without secondary performance optimization.

LP3964ES-2.5/NOPB (Texas Instruments): This parametric equivalent provides ROHS3 compliance and active product status. Selection is appropriate for applications requiring modern compliance certifications with standard performance characteristics.

All substitute parts share identical output voltage, output current, input voltage rating, voltage dropout, operating temperature range, package type, and protection features with the main part. Differences in quiescent current and PSRR specifications do not affect functional compatibility for standard linear regulator applications.

Frequently Asked Questions (FAQ)

Q: Can LP3874ES-2.5/NOPB directly replace LP3874ES-2.5?

A: Yes. LP3874ES-2.5/NOPB is a direct equivalent with identical electrical specifications and TO-263 package configuration. No circuit modifications are required.

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

A: Both are parametric equivalents with identical output voltage, current, and package specifications. LP3871ES-2.5/NOPB features lower quiescent current at 5mA compared to 9mA in LP3961ES-2.5/NOPB. PSRR is specified for LP3871ES-2.5/NOPB at 73dB ~ 57dB (120Hz) but not specified for LP3961ES-2.5/NOPB.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263-6 (D2PAK, 5 Leads + Tab) package with identical pin configuration and thermal characteristics. PCB layout modifications are not required.

Q: Which substitute part offers the best compliance status?

A: LP3871ES-2.5/NOPB, LP3961ES-2.5/NOPB, and LP3964ES-2.5/NOPB all carry ROHS3 compliance certification. The original LP3874ES-2.5 is RoHS non-compliant. All substitute parts are REACH Unaffected.

Q: Can I use LP3964ES-2.5/NOPB if PSRR specification is critical?

A: No. LP3964ES-2.5/NOPB does not specify PSRR performance. For applications requiring PSRR of 73dB ~ 57dB (120Hz), select LP3874ES-2.5/NOPB or LP3871ES-2.5/NOPB.

Q: What is the inventory status of substitute parts?

A: LP3874ES-2.5/NOPB: 1264 pcs; LP3871ES-2.5/NOPB: 1900 pcs; LP3961ES-2.5/NOPB: 5099 pcs; LP3964ES-2.5/NOPB: 993 pcs. All are listed as new original stock.

Q: Are moisture sensitivity levels identical across all parts?

A: LP3874ES-2.5, LP3871ES-2.5/NOPB, LP3961ES-2.5/NOPB, and LP3964ES-2.5/NOPB all specify MSL 3 (168 Hours). LP3874ES-2.5/NOPB does not specify MSL. Handling and storage procedures should follow MSL 3 requirements for all parts.

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