REG101NA-2.8/250 Equivalent & Substitute Parts

Part Overview

The REG101NA-2.8/250 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This Surface Mount device delivers 100mA output current in a compact SOT-23-5 package and operates across the -40°C to 85°C temperature range. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 2.8V regulated output with comparable electrical and mechanical specifications.

Substiute Parts

REG101NA-2.8/250

Texas InstrumentsIn Stock: 3258REG101NA-2.8/250 Datasheet

Current PartRFQ

LP2985-28DBVR

Texas InstrumentsIn Stock: 29356LP2985-28DBVR Datasheet

MFR RecommendedRFQ

MIC5219-2.8YM5-TR

Microchip TechnologyIn Stock: 2526MIC5219-2.8YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG101NA-2.8/250 are selected based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 2.8V
• Surface Mount packaging in SOT-23-5 form factor
• Positive output configuration with single regulator
• Enable control feature
• Over Current and Over Temperature protection
• RoHS3 compliance and MSL Level 1 rating

The substitute parts listed maintain these core electrical and mechanical specifications while offering variations in output current capacity, input voltage rating, quiescent current, and product status. All substitutes are packaged in the same SC-74A / SOT-753 footprint, ensuring mechanical compatibility in existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

LP2985-28DBVR is an active product from Texas Instruments offering 150mA output current capacity with extended input voltage rating to 16V and expanded operating temperature range to 125°C. This substitute provides higher current headroom while maintaining the same output voltage and package footprint. The addition of Short Circuit protection enhances device robustness compared to the original part.

MIC5219-2.8YM5-TR is an active product from Microchip Technology providing significantly higher output current capacity at 500mA with the lowest quiescent current of 8 µA among the three options. This substitute offers superior PSRR performance at 75dB and includes Reverse Polarity protection. The extended operating temperature range to 125°C and higher input voltage rating to 12V provide additional design margin.

Both substitute parts are RoHS3 compliant with MSL Level 1 rating, matching the original part's environmental and regulatory status. Selection between substitutes depends on application requirements for output current capacity, input voltage headroom, and thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can LP2985-28DBVR directly replace REG101NA-2.8/250 in existing designs?

A: Yes. Both parts share identical 2.8V fixed output voltage, SOT-23-5 package footprint, and core protection features. The LP2985-28DBVR provides higher output current capacity (150mA vs 100mA) and extended input voltage rating (16V vs 10V), making it suitable for applications where the original part meets or exceeds current requirements.

Q: What are the key differences between LP2985-28DBVR and MIC5219-2.8YM5-TR?

A: Both are active products with 2.8V output and SOT-23-5 packaging. MIC5219-2.8YM5-TR offers significantly higher output current (500mA vs 150mA), lower quiescent current (8 µA vs 95 µA), and higher PSRR (75dB vs 45dB). LP2985-28DBVR provides higher input voltage rating (16V vs 12V). Selection depends on whether the application prioritizes current capacity and efficiency or input voltage headroom.

Q: Are all substitute parts pin-compatible with REG101NA-2.8/250?

A: All three parts use the SC-74A / SOT-753 package designation (SOT-23-5 form factor), ensuring identical pin count and mechanical footprint. Pin-level compatibility for control and protection features is maintained across all substitutes.

Q: What is the impact of different quiescent current values on system design?

A: Quiescent current affects standby power consumption. REG101NA-2.8/250 draws 500 µA, LP2985-28DBVR draws 95 µA, and MIC5219-2.8YM5-TR draws 8 µA. Applications with strict power budget constraints benefit from lower quiescent current specifications.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. REG101NA-2.8/250, LP2985-28DBVR, and MIC5219-2.8YM5-TR are all ROHS3 compliant with MSL Level 1 rating, meeting identical environmental and regulatory requirements.