LP2951CMMX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951CMMX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This device delivers 100mA output current in an 8-VSSOP surface mount package and is classified as Last Time Buy status. The part provides regulated voltage output with integrated protection features including over-current, over-temperature, and short-circuit protection. Finding equivalent and substitute parts is necessary due to Last Time Buy status, ensuring design continuity and supply chain flexibility for production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (5V)
Voltage - Output (Max)	29V
Voltage Dropout (Max)	0.6V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Current - Supply (Max)	14 mA
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP
Base Product Number	LP2951
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the LP2951CMMX are determined by strict parametric equivalence across all electrical and mechanical specifications. All substitute parts maintain identical performance characteristics across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable/Fixed)
Voltage ratings (Input Max: 30V, Output Min/Fixed: 1.235V/5V, Output Max: 29V)
Dropout voltage (0.6V @ 100mA)
Output current (100mA)
Quiescent current (120 µA)
Protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range (-40°C ~ 125°C)
Package type (8-VSSOP)
Compliance certifications (ROHS3, REACH Unaffected)

Variations in packaging format (Cut Tape vs. Tape & Reel) and product status (Last Time Buy vs. Active) do not affect electrical or mechanical compatibility. All listed substitutes are from Texas Instruments LP2951 base product family.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Output Current	Voltage Dropout	Operating Temp	Package Type	RoHS Status	Inventory (Pcs)
LP2951CMMX	Texas Instruments	Last Time Buy	Cut Tape (CT) & Digi-Reel®	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	1455
LP2951ACMM	Texas Instruments	Last Time Buy	Cut Tape (CT) & Digi-Reel®	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	29751
LP2951ACMM/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	27090
LP2951ACMMX/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	6400
LP2951CMM/NOPB	Texas Instruments	Active	Tape & Reel (TR)	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	12000
LP2951CMMX/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-VSSOP	ROHS3 Compliant	1756

Engineering Selection Recommendations

All substitute parts listed maintain full parametric equivalence with the LP2951CMMX and are suitable for direct replacement in applications requiring a positive adjustable linear voltage regulator with 100mA output capability.

LP2951ACMM/NOPB and LP2951ACMMX/NOPB are recommended as primary alternatives due to Active product status, ensuring long-term availability and continued manufacturer support. These parts provide the highest inventory levels among Active alternatives (27090 and 6400 units respectively).

LP2951CMM/NOPB offers the largest available inventory (12000 units) among Active parts and is suitable for high-volume production requirements, with the only variation being Tape & Reel packaging format instead of Cut Tape.

All substitute parts comply with ROHS3 and REACH requirements, maintaining regulatory compliance equivalent to the original LP2951CMMX specification.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM/NOPB be used as a direct replacement for LP2951CMMX?

A: Yes. Both parts are parametrically equivalent across all electrical specifications including output current (100mA), voltage ratings, dropout voltage, protection features, and operating temperature range. The primary difference is product status (Active vs. Last Time Buy) and packaging format designation, neither of which affects functional compatibility.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) and Tape & Reel (TR) are packaging and delivery formats only. Both contain identical components in the same 8-VSSOP package. Cut Tape is supplied in smaller quantities on individual tape strips, while Tape & Reel is supplied in larger quantities on continuous reels. Electrical and mechanical specifications remain identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification and REACH Unaffected status, matching the compliance profile of the LP2951CMMX.

Q: Why is LP2951CMMX marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer will discontinue production. Substitute parts with Active status (LP2951ACMM/NOPB, LP2951ACMMX/NOPB, LP2951CMM/NOPB, LP2951CMMX/NOPB) ensure continued availability for future production and maintenance requirements.

Q: Can I mix different substitute part numbers in the same design?

A: Yes. All substitute parts are parametrically equivalent and can be used interchangeably within the same circuit design without modification to PCB layout, schematic, or application firmware.

Q: What inventory levels are available for each substitute?

A: LP2951ACMM offers 29751 units, LP2951ACMM/NOPB offers 27090 units, LP2951CMM/NOPB offers 12000 units, LP2951ACMMX/NOPB offers 6400 units, and LP2951CMMX/NOPB offers 1756 units. Inventory levels should be verified with your supplier for current availability.

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