REG101NA-A/3K Equivalent & Substitute Parts

Part Overview

The REG101NA-A/3K is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 100mA output current in a compact SOT-23-5 surface mount package. The device features adjustable output voltage regulation from 2.5V to 5.5V with a maximum input voltage of 10V and dropout voltage of 0.13V at 100mA.

This part carries a Last Time Buy product status, indicating it has been discontinued or is approaching end-of-life. Identifying equivalent and substitute parts is necessary to ensure design continuity and support long-term production requirements.

Substiute Parts

REG101NA-A/3K

Texas InstrumentsIn Stock: 2052REG101NA-A/3K Datasheet

Current PartRFQ

TPS7A2401DBVR

Texas InstrumentsIn Stock: 19846TPS7A2401DBVR Datasheet

MFR RecommendedRFQ

REG101NA-A/250

Texas InstrumentsIn Stock: 1787REG101NA-A/250 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG101NA-A/3K are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (REG101NA-A/250): This part maintains identical electrical specifications including 100mA output current, 2.5V to 5.5V output voltage range, 0.13V dropout voltage, and 500 µA quiescent current. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Both parts share the same SOT-23-5 package footprint and are pin-compatible.

Manufacturer Recommended Substitute (TPS7A2401DBVR): This part provides enhanced electrical performance with higher output current (200mA), wider input voltage range (18V maximum), lower quiescent current (4.5 µA), and extended operating temperature range (-40°C to 125°C). It maintains the same SOT-23-5 package and positive adjustable output configuration. The TPS7A2401DBVR is suitable for applications requiring higher current capacity or improved thermal performance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: REG101NA-A/250 is the appropriate choice when an identical electrical specification match is required. Both parts are Last Time Buy status devices with identical performance parameters. The substitution involves only packaging format change from Tape & Reel to Cut Tape & Digi-Reel®, with no circuit redesign necessary.

For Enhanced Performance: TPS7A2401DBVR is recommended when design requirements permit specification upgrades. This part is in Active product status, ensuring long-term availability and supply continuity. The TPS7A2401DBVR provides superior performance characteristics including doubled output current capacity, extended input voltage range, significantly reduced quiescent current, and wider operating temperature range. These enhancements make it suitable for applications with higher current demands or thermal constraints.

All three parts maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring regulatory and environmental compatibility across substitution options.

Frequently Asked Questions (FAQ)

Q: Can REG101NA-A/250 be used as a direct drop-in replacement for REG101NA-A/3K?

A: Yes. REG101NA-A/250 is a parametric equivalent with identical electrical specifications and SOT-23-5 package footprint. The only difference is the packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). No circuit modifications are required for substitution.

Q: What are the key differences between REG101NA-A/3K and TPS7A2401DBVR?

A: The TPS7A2401DBVR offers higher output current (200mA versus 100mA), wider input voltage range (18V versus 10V maximum), lower quiescent current (4.5 µA versus 500 µA), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and includes Under Voltage Lockout protection. Both maintain the same SOT-23-5 package and positive adjustable output configuration.

Q: Is TPS7A2401DBVR pin-compatible with REG101NA-A/3K?

A: Yes. Both devices use the SOT-23-5 package with identical pin assignments for positive adjustable linear regulator applications. No PCB layout modifications are necessary for substitution.

Q: Why is REG101NA-A/3K marked as Last Time Buy?

A: Last Time Buy status indicates the part has been discontinued or is approaching end-of-life. Customers are advised to transition to alternative parts for new designs or long-term production support. REG101NA-A/250 provides identical specifications, while TPS7A2401DBVR offers enhanced performance with Active product status.

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

A: TPS7A2401DBVR is recommended for new designs due to its Active product status, ensuring long-term availability and supply continuity. The enhanced electrical specifications provide additional design margin and performance headroom for most applications.

Q: Are all three parts RoHS compliant?

A: Yes. REG101NA-A/3K, REG101NA-A/250, and TPS7A2401DBVR are all ROHS3 compliant with identical moisture sensitivity levels (MSL 1, Unlimited), ensuring regulatory and environmental compatibility.