LP3985ITL-3.1 Equivalent & Substitute Parts

Part Overview

The LP3985ITL-3.1 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 3.1V output and operates across an input voltage range up to 6V. The main part number (LP3985ITL-3.1) carries an Obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3.1V
Voltage - Input (Max)	6V
Current - Output	150mA
Voltage Dropout (Max)	0.1V @ 150mA
Current - Quiescent (Iq)	150 µA
PSRR	50dB ~ 40dB (1kHz ~ 10kHz)
Package / Case	5-WFBGA, DSBGA
Supplier Device Package	5-DSBGA (1.41x1.08)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3985ITL-3.1 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 3.1V fixed
Maximum output current: 150mA
Maximum input voltage: 6V
Voltage dropout: 0.1V @ 150mA
Package type: 5-DSBGA (1.41x1.08)
Positive output configuration
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit

The substitute parts identified maintain identical electrical specifications and mechanical packaging, ensuring direct functional equivalence. Differences in product status and moisture sensitivity level do not affect electrical performance or pin compatibility.

Parameter Comparison

Parameter	LP3985ITL-3.1 (Main)	LP3985ITL-3.1/NOPB (Direct)	LP3985ITLX-3.1/NOPB (Parametric)
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Voltage - Output (Min/Fixed)	3.1V	3.1V	3.1V
Voltage - Input (Max)	6V	6V	6V
Current - Output	150mA	150mA	150mA
Voltage Dropout (Max)	0.1V @ 150mA	0.1V @ 150mA	0.1V @ 150mA
Current - Quiescent (Iq)	150 µA	150 µA	150 µA
Current - Supply (Max)	250 µA	250 µA	250 µA
PSRR	50dB ~ 40dB (1kHz ~ 10kHz)	50dB ~ 40dB (1kHz ~ 10kHz)	50dB ~ 40dB (1kHz ~ 10kHz)
Package / Case	5-WFBGA, DSBGA	5-WFBGA, DSBGA	5-WFBGA, DSBGA
Supplier Device Package	5-DSBGA (1.41x1.08)	5-DSBGA (1.41x1.08)	5-DSBGA (1.41x1.08)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Tape & Reel (TR)	Tape & Reel (TR)
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts—LP3985ITL-3.1/NOPB and LP3985ITLX-3.1/NOPB—are active products from Texas Instruments with identical electrical and mechanical specifications to the obsolete main part number. Selection between these substitutes should be based on the following factors:

Product Status: Both substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the Obsolete main part.

Compliance & Certifications: All three part numbers maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for electronic component procurement.

Moisture Sensitivity: The substitute parts feature MSL 1 (Unlimited) compared to MSL 3 (168 Hours) for the main part, providing improved handling flexibility and extended shelf life without moisture bake-out requirements.

Packaging: Both substitutes are supplied in Tape & Reel (TR) format, standard for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LP3985ITL-3.1/NOPB and LP3985ITLX-3.1/NOPB be used interchangeably with the obsolete LP3985ITL-3.1?

A: Yes. Both substitute parts maintain identical electrical specifications, output voltage (3.1V fixed), output current (150mA), input voltage range (6V maximum), voltage dropout (0.1V @ 150mA), and package configuration (5-DSBGA 1.41x1.08). Pin compatibility and functional performance are equivalent.

Q: What is the difference between LP3985ITL-3.1/NOPB and LP3985ITLX-3.1/NOPB?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The primary differences are product status (both Active), inventory availability, and moisture sensitivity level (both MSL 1 Unlimited). Selection can be based on supplier availability and lead time.

Q: Why does the main part number show Obsolete status?

A: The LP3985ITL-3.1 is marked Obsolete, indicating Texas Instruments has discontinued this specific part number. The substitute part numbers (with /NOPB suffix) represent the current active equivalents that maintain full electrical and mechanical compatibility.

Q: Are there any package or pinout differences between these parts?

A: No. All three part numbers use the identical 5-DSBGA package with dimensions 1.41x1.08mm. Pinout, pad layout, and mechanical footprint are identical, enabling direct PCB-level substitution.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS3 compliance and the absence of lead in the solder balls and component construction.

Q: Is the improved moisture sensitivity level (MSL 1 vs MSL 3) significant for component handling?

A: MSL 1 (Unlimited) provides extended shelf life without moisture bake-out requirements, simplifying inventory management and reducing handling constraints compared to MSL 3 (168 Hours). This is an operational advantage with no impact on electrical performance.

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