REG101NA-5/250 Equivalent & Substitute Parts

Part Overview

The REG101NA-5/250 is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output 5V regulator with 100mA output capacity in SOT-23-5 surface mount packaging. This device is designated as Last Time Buy, indicating discontinued production status. The identification of equivalent and substitute parts is necessary to ensure design continuity and procurement availability for applications currently utilizing this regulator.

Substiute Parts

REG101NA-5/250

Texas InstrumentsIn Stock: 4115REG101NA-5/250 Datasheet

Current PartRFQ

LP2985-50DBVR

Texas InstrumentsIn Stock: 32205LP2985-50DBVR Datasheet

MFR RecommendedRFQ

MIC5219-5.0YM5-TR

Microchip TechnologyIn Stock: 20168MIC5219-5.0YM5-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG101NA-5/250 are selected based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 5V
• SOT-23-5 package compatibility
• Positive output configuration
• Enable control feature
• Surface mount mounting type
• ROHS3 compliance and identical HTSUS classification

The substitute parts identified maintain these core electrical and mechanical specifications while offering variations in output current capacity, input voltage rating, and quiescent current characteristics. These variations allow for direct replacement in applications where the original part is no longer available, provided the application's current requirements do not exceed the substitute part's specifications.

Parameter Comparison

Engineering Selection Recommendations

Both LP2985-50DBVR and MIC5219-5.0YM5-TR are active production alternatives to the REG101NA-5/250. Selection between these substitutes depends on application-specific current requirements:

The LP2985-50DBVR provides 150mA output capacity with improved quiescent current performance (95 µA versus 500 µA) and extended input voltage rating (16V maximum). This part is suitable for applications requiring moderate current increases with lower standby power consumption.

The MIC5219-5.0YM5-TR offers the highest output current capacity at 500mA with the lowest quiescent current (8 µA). This part accommodates applications with significantly higher current demands and provides superior power efficiency in low-power standby modes. Both substitutes maintain ROHS3 compliance and identical regulatory classification (HTSUS 8542.39.0001) as the original part.

Frequently Asked Questions (FAQ)

Q: Can LP2985-50DBVR directly replace REG101NA-5/250 in all applications?

A: LP2985-50DBVR is a direct functional replacement for applications drawing up to 150mA. The higher input voltage rating (16V versus 10V) and improved quiescent current provide additional design flexibility. Verify that your application's maximum current requirement does not exceed 150mA.

Q: What are the key differences between LP2985-50DBVR and MIC5219-5.0YM5-TR?

A: Both parts maintain 5V fixed output and SOT-23-5 packaging. LP2985-50DBVR is a Texas Instruments product with 150mA capacity, while MIC5219-5.0YM5-TR is a Microchip Technology product with 500mA capacity. MIC5219-5.0YM5-TR provides significantly lower quiescent current (8 µA) and includes reverse polarity protection.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use identical SOT-23-5 (SC-74A) packaging with the same pinout configuration, enabling direct PCB-level substitution without layout modifications.

Q: Do the substitute parts maintain the same operating temperature range?

A: REG101NA-5/250 operates from -40°C to 85°C. Both substitutes extend this range to -40°C to 125°C, providing improved thermal performance margin in high-temperature environments.

Q: Which substitute part should be selected for new designs?

A: For new designs, either active production part is acceptable. Select based on current requirements: LP2985-50DBVR for applications up to 150mA, or MIC5219-5.0YM5-TR for applications requiring higher current or superior quiescent current performance.