LP3985IBPX-3.3 Equivalent & Substitute Parts

Part Overview

The LP3985IBPX-3.3 is a linear voltage regulator IC from Texas Instruments designed for power management applications. It delivers a fixed 3.3V output at 150mA with a maximum dropout voltage of 0.1V, integrated protection features including over-current, over-temperature, and short-circuit protection, and operates across the industrial temperature range of -40°C to 125°C. The device is packaged in a 5-DSBGA (1.41x1.08mm) surface-mount configuration.

The LP3985IBPX-3.3 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.1V @ 150mA
Quiescent Current	150 µA
PSRR	50dB ~ 40dB (1kHz ~ 10kHz)
Operating Temperature Range	-40°C to 125°C
Package Type	5-DSBGA
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3985IBPX-3.3 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Fixed output voltage of 3.3V
Output current rating of 150mA
Maximum input voltage of 6V
Dropout voltage of 0.1V @ 150mA
Quiescent current of 150 µA
PSRR specification of 50dB ~ 40dB (1kHz ~ 10kHz)
Operating temperature range of -40°C to 125°C
Surface-mount 5-DSBGA package configuration
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature

Two substitute parts meet these criteria: LP3985ITL-3.3/NOPB and LP3985ITLX-3.3/NOPB. Both maintain full electrical and functional equivalence to the main part while differing in product status, packaging format, and compliance certifications.

Parameter Comparison

Parameter	LP3985IBPX-3.3	LP3985ITL-3.3/NOPB	LP3985ITLX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active	Active
Output Voltage	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA
Input Voltage (Max)	6V	6V	6V
Dropout Voltage (Max)	0.1V @ 150mA	0.1V @ 150mA	0.1V @ 150mA
Quiescent Current	150 µA	150 µA	150 µA
PSRR	50dB ~ 40dB (1kHz ~ 10kHz)	50dB ~ 40dB (1kHz ~ 10kHz)	50dB ~ 40dB (1kHz ~ 10kHz)
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	5-DSBGA (1.41x1.08)	5-DSBGA (1.41x1.08)	5-DSBGA (1.5x1.2)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Control Features	Enable	Enable	Enable
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified
Packaging Format	Bulk	Tape & Reel (TR)	Bulk

Engineering Selection Recommendations

LP3985ITL-3.3/NOPB is the primary substitute for the LP3985IBPX-3.3. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications and package dimensions (1.41x1.08mm). The LP3985ITL-3.3/NOPB holds active product status and carries ROHS3 compliance certification, making it suitable for new designs and applications requiring regulatory compliance. The part is available in Tape & Reel packaging format.

LP3985ITLX-3.3/NOPB is a secondary substitute manufactured by National Semiconductor. It maintains full electrical equivalence and active product status. The package dimensions differ slightly (1.5x1.2mm versus 1.41x1.08mm), which may require PCB layout verification for space-constrained applications. This part is available in bulk packaging format.

For applications requiring RoHS compliance and active product support, LP3985ITL-3.3/NOPB is the recommended selection. For applications where package size variation is acceptable, LP3985ITLX-3.3/NOPB provides an alternative with higher inventory availability.

Frequently Asked Questions (FAQ)

Q: Can LP3985ITL-3.3/NOPB be used as a direct replacement for LP3985IBPX-3.3?

A: Yes. Both parts deliver identical electrical performance: 3.3V fixed output, 150mA current capacity, 0.1V dropout voltage, and equivalent protection features. Package dimensions are identical (1.41x1.08mm), enabling direct PCB substitution without layout modifications.

Q: What is the difference between LP3985ITL-3.3/NOPB and LP3985ITLX-3.3/NOPB?

A: Both parts are electrically equivalent with identical output specifications and protection features. The primary differences are manufacturer (Texas Instruments versus National Semiconductor), package dimensions (1.41x1.08mm versus 1.5x1.2mm), and packaging format (Tape & Reel versus Bulk). The slightly larger package footprint of the LP3985ITLX-3.3/NOPB may require PCB layout verification in space-constrained designs.

Q: Why is the LP3985IBPX-3.3 listed as obsolete?

A: The LP3985IBPX-3.3 has reached end-of-life status. Active substitute parts with equivalent electrical specifications and improved compliance certifications are available to support ongoing production and maintenance requirements.

Q: Are there any compliance differences between the substitute parts?

A: LP3985ITL-3.3/NOPB carries ROHS3 compliance certification, making it suitable for applications requiring regulatory adherence. LP3985ITLX-3.3/NOPB compliance status is not specified in the provided data. Both parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: What packaging formats are available for the substitute parts?

A: LP3985ITL-3.3/NOPB is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. LP3985ITLX-3.3/NOPB is supplied in bulk format. Packaging selection depends on production volume and assembly methodology requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message