LP3878MR-ADJ Linear Voltage Regulator

Part Overview

The LP3878MR-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current with adjustable voltage regulation from 1V to 5.5V. The part is currently in Last Time Buy status, making identification of equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

LP3878MR-ADJ

Texas InstrumentsIn Stock: 17679LP3878MR-ADJ Datasheet

Current PartRFQ

LP3878MR-ADJ/NOPB

National SemiconductorIn Stock: 8900LP3878MR-ADJ/NOPB Datasheet

DirectRFQ

NCP3334DADJR2G

onsemiIn Stock: 10466NCP3334DADJR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent and substitute parts for the LP3878MR-ADJ are identified based on the following critical parameters that define functional interchangeability:

Primary Substitution Criteria:

• Output Configuration: Positive Adjustable
• Output Type: Adjustable voltage regulation capability
• Number of Regulators: Single output
• Package / Case: 8-PowerSOIC or 8-SOIC form factor (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Control Features: Enable function
• Protection Features: Over Current and Over Temperature protection

Secondary Compatibility Parameters:

• Current - Output: Minimum 500mA (LP3878MR-ADJ provides 800mA)
• Voltage - Input (Max): Minimum 12V (LP3878MR-ADJ accepts 16V)
• Voltage - Output Range: Overlap with 1V to 5.5V range
• Operating Temperature: -40°C minimum to 85°C minimum
• RoHS3 Compliance required for modern procurement

Parameter Comparison

Engineering Selection Recommendations

LP3878MR-ADJ/NOPB (Direct Equivalent): This part maintains identical electrical specifications and package form factor as the main LP3878MR-ADJ. Both devices deliver 800mA output current, support 16V maximum input voltage, and operate across the full -40°C to 125°C temperature range. The /NOPB designation indicates lead-free plating. This substitute is suitable for direct replacement in existing designs without modification. Product status is Active, ensuring continued availability.

NCP3334DADJR2G (Functional Substitute): This onsemi device provides positive adjustable output regulation in an 8-SOIC package compatible with the 3.90mm width specification. Key differences include reduced output current (500mA versus 800mA), lower maximum input voltage (12V versus 16V), and reduced maximum operating temperature (85°C versus 125°C). The NCP3334DADJR2G offers superior dropout voltage performance (0.34V @ 500mA) and significantly lower quiescent current (190 µA). This substitute is appropriate for applications where output current requirements do not exceed 500mA, input voltage remains below 12V, and operating temperature does not exceed 85°C. Product status is Active with ROHS3 compliance confirmed.

Frequently Asked Questions (FAQ)

Q: Can LP3878MR-ADJ/NOPB be used as a direct replacement for LP3878MR-ADJ?

A: Yes. Both parts share identical electrical specifications, output current rating (800mA), voltage ranges (1V to 5.5V output, 16V maximum input), and package form factor (8-PowerSOIC). The /NOPB designation refers to lead-free plating and does not affect functional compatibility.

Q: What are the limitations of NCP3334DADJR2G as a substitute?

A: The NCP3334DADJR2G has three key limitations: maximum output current is 500mA (compared to 800mA), maximum input voltage is 12V (compared to 16V), and maximum operating temperature is 85°C (compared to 125°C). Applications requiring higher current delivery, higher input voltage tolerance, or extended temperature operation must use LP3878MR-ADJ or LP3878MR-ADJ/NOPB.

Q: Are package dimensions compatible between LP3878MR-ADJ and NCP3334DADJR2G?

A: Both devices use 8-pin packages with 0.154" (3.90mm) width, making them mechanically compatible for PCB layout. However, LP3878MR-ADJ uses 8-PowerSOIC while NCP3334DADJR2G uses 8-SOIC. Pin configuration must be verified against datasheets before substitution.

Q: What compliance certifications apply to these parts?

A: LP3878MR-ADJ and NCP3334DADJR2G are both ROHS3 compliant. LP3878MR-ADJ carries Moisture Sensitivity Level 3 (168 Hours) and is REACH Affected. NCP3334DADJR2G has Moisture Sensitivity Level 1 (Unlimited) and is REACH Unaffected. Both parts carry ECCN EAR99 classification.

Q: Which substitute should be selected for new designs?

A: For new designs, selection depends on application requirements. If output current must reach 800mA, input voltage may exceed 12V, or operation above 85°C is required, use LP3878MR-ADJ or LP3878MR-ADJ/NOPB. If application requirements are within NCP3334DADJR2G limits (500mA maximum output, 12V maximum input, 85°C maximum temperature), the NCP3334DADJR2G offers superior dropout voltage and lower quiescent current, providing efficiency advantages in battery-powered or low-power applications.