LP2981-28DBVTG4 Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVTG4 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.8V output at 100mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides Enable control, Over Current, Over Temperature, and Short Circuit protection across an operating range of -40°C to 125°C.

Substiute Parts

LP2981-28DBVTG4

Texas InstrumentsIn Stock: 1063LP2981-28DBVTG4 Datasheet

Current PartRFQ

LP2985-28DBVR

Texas InstrumentsIn Stock: 29356LP2985-28DBVR Datasheet

MFR RecommendedRFQ

LP2981-28DBVR

Texas InstrumentsIn Stock: 6297LP2981-28DBVR Datasheet

Parametric EquivalentRFQ

LP2981-28DBVT

Texas InstrumentsIn Stock: 4440LP2981-28DBVT Datasheet

Parametric EquivalentRFQ

LP2981A-28DBVR

Texas InstrumentsIn Stock: 4420LP2981A-28DBVR Datasheet

Parametric EquivalentRFQ

LP2981A-28DBVT

Texas InstrumentsIn Stock: 4349LP2981A-28DBVT Datasheet

Parametric EquivalentRFQ

MIC5203-2.8YM5-TR

Microchip TechnologyIn Stock: 5815MIC5203-2.8YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2981-28DBVTG4 is determined by the following critical parameters:

• Fixed output voltage of 2.8V
• Output current capability of 100mA or greater
• Maximum input voltage of 16V or greater
• SOT-23-5 package compatibility
• Surface mount mounting type
• Operating temperature range of -40°C to 125°C or wider
• Enable control feature
• Protection features including Over Current, Over Temperature, and Short Circuit

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications with different packaging or product status) and manufacturer-recommended alternatives (higher current capability or different manufacturer).

Parameter Comparison

Engineering Selection Recommendations

For designs currently using LP2981-28DBVTG4, the following selection criteria apply based on product status and compliance:

Parametric Equivalents (Identical Electrical Performance): LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, and LP2981A-28DBVT maintain identical electrical specifications with 100mA output current and 0.37V dropout voltage. LP2981A-28DBVT is the preferred choice due to Active product status and Tape & Reel packaging availability. LP2981A-28DBVR remains available as Last Time Buy inventory.

Manufacturer-Recommended Alternative: LP2985-28DBVR from Texas Instruments provides 150mA output current capability within the same SOT-23-5 package. This part is Active and suitable for designs requiring higher current headroom. The increased dropout voltage of 0.58V @ 150mA and reduced PSRR of 45dB (1kHz) must be evaluated against application requirements.

Cross-Manufacturer Alternative: MIC5203-2.8YM5-TR from Microchip Technology delivers 2.8V output in SOT-23-5 packaging with Active product status. The 80mA output current is below the original specification, and the 750 µA quiescent current is significantly higher than the 95 µA of Texas Instruments parts. This option is suitable only for applications with reduced current requirements and where higher quiescent current is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT directly replace LP2981-28DBVTG4? A: Yes. Both parts deliver identical electrical performance: 2.8V fixed output, 100mA current, 0.37V dropout voltage, 95 µA quiescent current, and 63dB PSRR at 1kHz. Both use SOT-23-5 packaging. LP2981A-28DBVT has Active product status, making it the recommended direct replacement.

Q: What is the difference between LP2981-28DBVR and LP2981-28DBVT? A: Both parts are electrically identical with 100mA output and 0.37V dropout. The difference is packaging: DBVR indicates Cut Tape or Digi-Reel packaging, while DBVT indicates Tape & Reel (TR) packaging. Selection depends on procurement and assembly requirements.

Q: Can LP2985-28DBVR be used as a drop-in replacement? A: LP2985-28DBVR is pin-compatible and uses the same SOT-23-5 package. However, it delivers 150mA output current with 0.58V dropout voltage and 45dB PSRR, compared to the original 100mA, 0.37V, and 63dB specifications. Use this part only if your design can accommodate the higher dropout voltage and lower PSRR performance.

Q: Why is MIC5203-2.8YM5-TR listed as an alternative if it has lower output current? A: MIC5203-2.8YM5-TR is included as a cross-manufacturer option for designs with reduced current requirements (80mA or less). It maintains 2.8V output, SOT-23-5 packaging, and Active product status. The significantly higher quiescent current of 750 µA versus 95 µA must be considered for battery-powered or low-power applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts—LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, LP2981A-28DBVT, LP2985-28DBVR, and MIC5203-2.8YM5-TR—are ROHS3 compliant and REACH unaffected.

Q: What is the difference between Obsolete and Last Time Buy product status? A: Obsolete parts are no longer manufactured or supported. Last Time Buy parts are in their final production phase with limited availability before discontinuation. LP2981A-28DBVR is Last Time Buy, while LP2981A-28DBVT is Active and recommended for new designs.