LP3874ES-3.3 Equivalent & Substitute Parts

Part Overview

The LP3874ES-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 3.3V output at 800mA in a surface-mount TO-263 (DDPAK-5) package. The part is designated as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to support existing designs, maintain production continuity, and transition to active product alternatives that meet current compliance requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9mA (main part)
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution of the LP3874ES-3.3 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Output voltage: 3.3V fixed
Output current capability: 800mA
Maximum input voltage: 7V
Voltage dropout: 0.35V @ 800mA
Package type: TO-263 (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 function

Variable Parameters (Non-Critical for Substitution):

Quiescent current (Iq): Ranges from 5mA to 9mA across alternatives
PSRR: Specified in some parts, not specified in others
Product status: Main part is obsolete; substitutes are active
RoHS compliance: Main part is non-compliant; substitutes are ROHS3 compliant

All substitute parts listed maintain electrical and mechanical compatibility with the LP3874ES-3.3 within the specified parameter tolerances.

Parameter Comparison

Parameter	LP3874ES-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)	9mA	9mA	9mA	9mA	5mA
Supply Current (Max)	15mA	15mA	15mA	15mA	15mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not Specified	Not Specified	73dB ~ 57dB (120Hz)
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 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Compliance	Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

LP3874ES-3.3/NOPB is the direct equivalent of the main part number LP3874ES-3.3. This substitute maintains identical electrical specifications and is the preferred choice for direct replacement in existing designs. The primary advantage is the transition from a non-compliant to ROHS3-compliant device while preserving all functional parameters.

Parametric Equivalents (Full Functional Compatibility):

LP3961ES-3.3/NOPB, LP3964ES-3.3/NOPB, and LP3871ES-3.3/NOPB are parametric equivalents that deliver identical output voltage, current, and thermal performance. All three parts are ROHS3 compliant and carry active product status.

LP3871ES-3.3/NOPB offers a reduced quiescent current of 5mA compared to the 9mA specification of the main part, resulting in lower standby power consumption. This part is suitable for applications where power efficiency during idle states is a design consideration.

LP3961ES-3.3/NOPB and LP3964ES-3.3/NOPB maintain the 9mA quiescent current specification. LP3961ES-3.3/NOPB carries REACH Affected status, while LP3964ES-3.3/NOPB is REACH Unaffected. Selection between these two should account for supply chain and regulatory requirements specific to the end application.

Compliance Transition:

All substitute parts transition from the obsolete, non-compliant LP3874ES-3.3 to active, ROHS3-compliant alternatives. This transition supports long-term design sustainability and regulatory compliance in manufacturing environments subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can LP3874ES-3.3/NOPB be used as a direct replacement for LP3874ES-3.3?

A: Yes. LP3874ES-3.3/NOPB is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). Pin configuration, package type, and all electrical parameters are identical.

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

A: LP3871ES-3.3/NOPB has a quiescent current (Iq) of 5mA, compared to 9mA in the main part and other substitutes. This lower quiescent current reduces standby power consumption. All other electrical parameters, including output voltage, current, dropout voltage, and operating temperature range, remain identical.

Q: Are all substitute parts pin-compatible with the original LP3874ES-3.3?

A: Yes. All substitute parts use the TO-263 (DDPAK-5) package with identical pin configuration. PCB layout and component placement require no modification.

Q: What is the significance of REACH Affected versus REACH Unaffected status?

A: REACH Affected status (LP3961ES-3.3/NOPB) indicates the part contains substances of concern under REACH regulations and requires additional documentation and compliance tracking. REACH Unaffected parts (LP3874ES-3.3/NOPB, LP3964ES-3.3/NOPB, LP3871ES-3.3/NOPB) do not contain such substances. Selection depends on supply chain requirements and regulatory obligations in the target market.

Q: Can these parts be used interchangeably in production?

A: Yes, within the constraints of the specified parameters. All substitute parts deliver 3.3V at 800mA with identical dropout voltage, operating temperature range, and protection features. The choice between substitutes should be based on quiescent current requirements, compliance certifications, and inventory availability.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All parts, including the main part and all substitutes, have an MSL rating of 3 with a floor life of 168 hours. This indicates standard moisture sensitivity handling requirements for surface-mount components.

Q: Why is the main part LP3874ES-3.3 marked as "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory remains available for legacy design support. New designs should utilize one of the active substitute parts listed.

Q: Are there differences in PSRR (Power Supply Rejection Ratio) between the substitutes?

A: LP3874ES-3.3/NOPB and LP3871ES-3.3/NOPB specify PSRR at 73dB ~ 57dB (120Hz). LP3961ES-3.3/NOPB and LP3964ES-3.3/NOPB do not provide PSRR specifications in the available data. For applications requiring specified PSRR performance, LP3874ES-3.3/NOPB or LP3871ES-3.3/NOPB are the appropriate selections.

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