LP2980IM5-2.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP2980IM5-2.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers a fixed 2.8V output at 50mA maximum current in a compact SOT-23-5 surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

LP2980IM5-2.8/NOPB

Texas InstrumentsIn Stock: 1029LP2980IM5-2.8/NOPB Datasheet

Current PartRFQ

LP2981A-28DBVR

Texas InstrumentsIn Stock: 4420LP2981A-28DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2980IM5-2.8/NOPB is determined by the following critical parameters:

• Fixed output voltage of 2.8V
• SOT-23-5 package compatibility
• Maximum input voltage rating of 16V or higher
• Operating temperature range of -40°C to 125°C
• Positive output configuration with single regulator
• Enable control feature and integrated protection (Over Current, Over Temperature, Short Circuit)

The LP2981A-28DBVR qualifies as a direct substitute based on these parameters. While it provides higher output current capability (100mA versus 50mA), this represents an enhancement rather than a limitation, as the substitute can support all applications designed for the original 50mA specification.

Parameter Comparison

Engineering Selection Recommendations

The LP2981A-28DBVR is the manufacturer-recommended substitute for the obsolete LP2980IM5-2.8/NOPB. Both devices maintain identical electrical specifications for output voltage, input voltage rating, quiescent current, and PSRR performance. The substitute offers increased output current capacity (100mA versus 50mA), which provides design margin without requiring circuit modifications.

From a compliance perspective, both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. The LP2981A-28DBVR carries a Last Time Buy status, indicating continued availability for procurement planning.

The identical SOT-23-5 package footprint ensures direct PCB compatibility without layout changes. Pinout and control signal requirements remain unchanged between the two devices.

Frequently Asked Questions (FAQ)

Q: Can the LP2981A-28DBVR directly replace the LP2980IM5-2.8/NOPB without PCB modifications?

A: Yes. Both devices use the SOT-23-5 package with identical pinout and control features. No PCB layout changes are required.

Q: What is the primary difference between these two regulators?

A: The LP2981A-28DBVR provides 100mA maximum output current compared to the LP2980IM5-2.8/NOPB's 50mA rating. All other electrical characteristics, including output voltage, input voltage range, and protection features, remain identical.

Q: Are there any thermal or power dissipation considerations when substituting?

A: The higher current capability of the LP2981A-28DBVR does not increase power dissipation in applications limited to 50mA operation. Thermal performance remains equivalent when operating within the original design current envelope.

Q: What is the significance of the Last Time Buy status for the LP2981A-28DBVR?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this part. Procurement should be planned accordingly, though current inventory availability is confirmed at 4400 pieces.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the LP2980IM5-2.8/NOPB and LP2981A-28DBVR operate across -40°C to 125°C, with identical quiescent current and protection features across this range.

Q: How do the dropout voltage specifications compare?

A: The LP2980IM5-2.8/NOPB specifies 0.22V dropout at 50mA, while the LP2981A-28DBVR specifies 0.37V dropout at 100mA. For applications limited to 50mA operation, the actual dropout voltage of the substitute will be lower than its rated specification.