REG101NA-A/250 Equivalent & Substitute Parts

Part Overview

The REG101NA-A/250 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device operates as a single-output regulator with 100mA current capacity in an SOT-23-5 package. 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 this regulator's functional specifications.

Substiute Parts

REG101NA-A/250

Texas InstrumentsIn Stock: 1787REG101NA-A/250 Datasheet

Current PartRFQ

TPS7A2401DBVR

Texas InstrumentsIn Stock: 19846TPS7A2401DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the REG101NA-A/250 is determined by the following critical parameters:

Package Compatibility: Both parts must use SOT-23-5 (SC-74A, SOT-753) surface mount packaging to ensure PCB layout compatibility without redesign.

Output Configuration & Type: Both must provide positive adjustable output to maintain circuit functionality.

Voltage Specifications: The substitute must accommodate the input voltage range and output voltage range required by the application. The REG101NA-A/250 operates with maximum input of 10V and adjustable output between 2.5V and 5.5V.

Current Rating: The substitute must support at least the 100mA output current requirement of the original design.

Control Features & Protection: Both parts include Enable control and Over Current/Over Temperature protection, ensuring equivalent functional safety.

Compliance & Certifications: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements.

The TPS7A2401DBVR qualifies as a substitute based on these parameters while offering enhanced specifications in certain areas.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A2401DBVR is a qualified substitute for the REG101NA-A/250 based on the following engineering criteria:

Package Equivalence: Both devices use identical SOT-23-5 packaging, enabling direct PCB layout compatibility without circuit board redesign.

Functional Compatibility: Both regulators provide positive adjustable output with Enable control and core protection features (Over Current, Over Temperature), maintaining equivalent circuit functionality.

Regulatory Compliance: Both parts are ROHS3 compliant and REACH unaffected, satisfying the same regulatory requirements.

Product Status Advantage: The TPS7A2401DBVR is in Active production status, whereas the REG101NA-A/250 is Last Time Buy. This makes the substitute the appropriate choice for new designs and long-term supply continuity.

Enhanced Specifications: The substitute offers superior performance characteristics including higher input voltage rating (18V vs 10V), extended output voltage range (1.24V to 17.75V vs 2.5V to 5.5V), doubled output current capacity (200mA vs 100mA), significantly reduced quiescent current (4.5 µA vs 500 µA), and extended operating temperature range (-40°C to 125°C vs -40°C to 85°C).

For applications operating within the original part's specifications, the TPS7A2401DBVR provides equivalent or superior performance with the advantage of active production status and extended design flexibility.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2401DBVR directly replace the REG101NA-A/250 without PCB modifications?

A: Yes. Both devices use identical SOT-23-5 packaging (SC-74A, SOT-753), enabling pin-for-pin compatibility and direct PCB substitution without layout changes.

Q: What are the key differences between these regulators?

A: The primary differences are product status (Last Time Buy vs Active), output current capacity (100mA vs 200mA), quiescent current consumption (500 µA vs 4.5 µA), input voltage rating (10V vs 18V), and operating temperature range (-40°C to 85°C vs -40°C to 125°C). The TPS7A2401DBVR also includes Under Voltage Lockout (UVLO) protection.

Q: Is the TPS7A2401DBVR suitable for applications requiring only 100mA output?

A: Yes. The TPS7A2401DBVR is rated for 200mA output, making it fully capable of supplying 100mA applications. The higher current rating provides design margin without affecting circuit operation.

Q: How do the dropout voltages compare?

A: The REG101NA-A/250 has 0.13V dropout at 100mA, while the TPS7A2401DBVR has 0.25V dropout at 200mA. For applications operating at 100mA with the substitute, the actual dropout will be lower than the specified maximum.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the REG101NA-A/250 and TPS7A2401DBVR are ROHS3 compliant and REACH unaffected, meeting the same environmental and regulatory standards.

Q: Why is the REG101NA-A/250 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this product line. The TPS7A2401DBVR represents the active alternative from Texas Instruments for new designs and ongoing production requirements.

Q: Can I use the TPS7A2401DBVR in applications requiring the extended temperature range of the original part?

A: The TPS7A2401DBVR actually provides an extended operating temperature range (-40°C to 125°C junction temperature) compared to the REG101NA-A/250 (-40°C to 85°C), making it suitable for higher temperature applications.