REG102NA-A/3K Equivalent & Substitute Parts

Part Overview

The REG102NA-A/3K is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 250mA output current in a compact SOT-23-5 package and operates across -40°C to 85°C. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and ensuring component availability for production and maintenance cycles.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	250mA
Voltage - Input (Max)	10V
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	5.5V
Voltage Dropout (Max)	0.27V @ 250mA
Package / Case	SC-74A, SOT-753
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the REG102NA-A/3K are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output Configuration: Positive
Output Type: Adjustable
Minimum Output Current: 250mA or greater
Input Voltage Range: Minimum 10V support
Output Voltage Range: Minimum 2.5V to 5.5V coverage
Mounting Type: Surface Mount
RoHS3 Compliance

Substitution Categories:

Parametric Equivalent: REG102NA-A/250 maintains identical electrical specifications and package form factor as the main part, differing only in packaging format (Tape & Reel variant).

Manufacturer Recommended Substitute: TPS7A2501DRVR provides enhanced performance characteristics including higher output current (300mA), extended input voltage range (18V maximum), wider output voltage range (1.24V to 17.66V), and improved quiescent current (4.5 µA versus 500 µA). This part operates across -40°C to 125°C and includes additional control features (Power Good) and protection mechanisms (UVLO).

Parameter Comparison

Parameter	REG102NA-A/3K	REG102NA-A/250	TPS7A2501DRVR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Current - Output	250mA	250mA	300mA
Voltage - Input (Max)	10V	10V	18V
Voltage - Output (Min/Fixed)	2.5V	2.5V	1.24V
Voltage - Output (Max)	5.5V	5.5V	17.66V
Voltage Dropout (Max)	0.27V @ 250mA	0.27V @ 250mA	0.34V @ 300mA
Current - Quiescent (Iq)	500 µA	500 µA	4.5 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	6-WDFN Exposed Pad
Product Status	Last Time Buy	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

REG102NA-A/250 (Parametric Equivalent): This part is suitable for direct replacement in applications where the SOT-23-5 package footprint and identical electrical specifications are required. Both parts share Last Time Buy status, indicating limited future availability. Selection of this variant is appropriate when packaging format is the only differentiator and supply chain constraints do not apply.

TPS7A2501DRVR (Manufacturer Recommended Substitute): This part is the recommended long-term solution due to Active product status, ensuring sustained availability and manufacturing support. The TPS7A2501DRVR is suitable for applications requiring enhanced performance margins, including higher output current capacity (300mA), extended input voltage tolerance (18V), and wider output voltage range (1.24V to 17.66V). The significantly lower quiescent current (4.5 µA) provides advantages in battery-powered or low-power standby applications. Extended operating temperature range (-40°C to 125°C) supports demanding thermal environments. The 6-WSON package requires PCB layout redesign but offers superior thermal performance through the exposed pad. Additional control features (Power Good output) and protection mechanisms (UVLO) provide enhanced system-level functionality.

Frequently Asked Questions (FAQ)

Q: Can REG102NA-A/250 be used as a direct drop-in replacement for REG102NA-A/3K?

A: Yes. REG102NA-A/250 is a parametric equivalent with identical electrical specifications and package form factor (SOT-23-5). No circuit modifications are required. Both parts are Last Time Buy status, so long-term availability should be evaluated.

Q: What are the key differences between REG102NA-A/3K and TPS7A2501DRVR?

A: The primary differences are: (1) Package type—TPS7A2501DRVR uses 6-WSON versus SOT-23-5, requiring PCB redesign; (2) Output current—300mA versus 250mA; (3) Input voltage range—18V maximum versus 10V; (4) Output voltage range—1.24V to 17.66V versus 2.5V to 5.5V; (5) Quiescent current—4.5 µA versus 500 µA; (6) Operating temperature—-40°C to 125°C versus -40°C to 85°C; (7) Product status—Active versus Last Time Buy.

Q: Is TPS7A2501DRVR pin-compatible with REG102NA-A/3K?

A: No. TPS7A2501DRVR uses a 6-WSON package while REG102NA-A/3K uses SOT-23-5. Pin count and pinout differ, requiring schematic and PCB layout modifications.

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

A: TPS7A2501DRVR is recommended for new designs due to Active product status, ensuring long-term availability and manufacturing support. REG102NA-A/3K and REG102NA-A/250 are both Last Time Buy, limiting their suitability for production designs with extended lifecycles.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. REG102NA-A/3K, REG102NA-A/250, and TPS7A2501DRVR are all ROHS3 compliant and REACH unaffected.

Q: What is the inventory status of each part?

A: REG102NA-A/3K has 4173 pieces in stock, REG102NA-A/250 has 1382 pieces in stock, and TPS7A2501DRVR has 17300 pieces in stock.

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