LP3871ES-3.3 Equivalent & Substitute Parts

Part Overview

The LP3871ES-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 800mA in a TO-263 (DDPAK-5) surface mount package. The main part number LP3871ES-3.3 is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Output Configuration	Positive Fixed
Package Type	TO-263-6 (DDPAK-5)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3871ES-3.3 are qualified based on the following critical parameters that must match or remain within acceptable tolerances:

Output voltage: 3.3V fixed
Output current capability: 800mA
Maximum input voltage: 7V
Voltage dropout: 0.35V @ 800mA
Package type: TO-263-6 (DDPAK-5)
Surface mount configuration
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit
Enable control feature

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications designed for the LP3871ES-3.3.

Parameter Comparison

Parameter	LP3871ES-3.3	LP3874ES-3.3/NOPB	LP3961ES-3.3/NOPB	LP3964ES-3.3/NOPB	LP3871ES-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V
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)	5 mA	9 mA	9 mA	9 mA	5 mA
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)
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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Primary Recommendation: LP3871ES-3.3/NOPB

The LP3871ES-3.3/NOPB is the direct equivalent with active product status. It maintains identical electrical specifications to the original LP3871ES-3.3, including the lower quiescent current of 5 mA and PSRR performance of 73dB ~ 57dB (120Hz). This part is ROHS3 compliant and currently in active production, making it the preferred choice for new designs and ongoing procurement.

Secondary Recommendations: LP3874ES-3.3/NOPB, LP3961ES-3.3/NOPB, LP3964ES-3.3/NOPB

All three alternatives are functionally equivalent and maintain active product status with ROHS3 compliance. These parts differ from the primary recommendation in quiescent current (9 mA versus 5 mA), which may impact power consumption in low-power applications. LP3961ES-3.3/NOPB and LP3964ES-3.3/NOPB do not specify PSRR performance in the provided data. Selection among these alternatives should be based on availability and specific application power budget requirements.

Frequently Asked Questions (FAQ)

Q: Can I use LP3874ES-3.3/NOPB as a direct replacement for LP3871ES-3.3?

A: Yes. Both parts deliver 3.3V at 800mA in the same TO-263 (DDPAK-5) package with identical voltage dropout and operating temperature specifications. The primary difference is quiescent current: LP3874ES-3.3/NOPB draws 9 mA versus 5 mA for the original. This difference is acceptable in most applications unless power consumption is a critical constraint.

Q: What is the difference between LP3871ES-3.3 and LP3871ES-3.3/NOPB?

A: Both are the same part from Texas Instruments. The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging and ROHS3 compliance. The original LP3871ES-3.3 is listed as obsolete and non-compliant. The LP3871ES-3.3/NOPB variant is currently in active production.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the TO-263-6 (DDPAK-5) surface mount package, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute part has the lowest power consumption?

A: LP3871ES-3.3/NOPB and the original LP3871ES-3.3 both have a quiescent current of 5 mA. The alternatives (LP3874ES-3.3/NOPB, LP3961ES-3.3/NOPB, LP3964ES-3.3/NOPB) draw 9 mA. For applications where standby power is critical, the 5 mA variants are preferred.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (LP3871ES-3.3/NOPB, LP3874ES-3.3/NOPB, LP3961ES-3.3/NOPB, LP3964ES-3.3/NOPB) are ROHS3 compliant. The original LP3871ES-3.3 is non-compliant and obsolete.

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