LP2951ACMM-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP2951ACMM-3.3/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive adjustable (fixed) output regulator delivers 100mA with a 3.3V fixed output configuration in an 8-VSSOP surface mount package. The device is currently in active production status with 2160 units in stock. Alternative part numbers are necessary when Cut Tape packaging is unavailable or when sourcing from alternative manufacturers becomes required due to supply constraints or procurement specifications.

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 (Fixed)	3.3V
Current - Output	100mA
Voltage Dropout (Max)	0.6V @ 100mA
Current - Quiescent (Iq)	120 µA
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2951ACMM-3.3/NOPB is determined by the following critical parameters:

Output voltage fixed at 3.3V
100mA output current capability
30V maximum input voltage rating
8-VSSOP package configuration
Surface mount technology
Operating temperature range -40°C to 125°C
ROHS3 compliance and MSL Level 1 rating

Substitute parts must maintain identical electrical specifications across these parameters. Packaging format differences (Cut Tape vs. Tape & Reel) do not affect functional equivalence. Manufacturer variations are acceptable when all electrical and thermal characteristics remain unchanged.

Parameter Comparison

Parameter	LP2951ACMM-3.3/NOPB (Main)	LP2951CMM-3.3/NOPB	LP2951CMMX-3.3/NOPB	LP2951ACDM-3.3RG
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Fixed
Voltage - Output (Fixed)	3.3V	3.3V	3.3V	3.3V
Voltage - Input (Max)	30V	30V	30V	30V
Current - Output	100mA	100mA	100mA	100mA
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	12 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	-
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain active production status and ROHS3 compliance. The LP2951CMM-3.3/NOPB and LP2951CMMX-3.3/NOPB are parametric equivalents from Texas Instruments with identical electrical specifications; selection between these and the main part depends on packaging format availability (Tape & Reel vs. Cut Tape).

The LP2951ACDM-3.3RG from onsemi is a manufacturer-recommended alternative that meets all critical electrical parameters. This part exhibits a lower maximum dropout voltage (0.45V vs. 0.6V) and reduced maximum supply current (12 mA vs. 14 mA), both favorable characteristics. The onsemi variant is suitable for applications where these improved specifications provide design margin benefits.

All parts share identical package geometry (8-TSSOP, 8-MSOP), operating temperature range, and compliance certifications, ensuring direct functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can LP2951CMM-3.3/NOPB replace LP2951ACMM-3.3/NOPB in production?

A: Yes. Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: LP2951CMM-3.3/NOPB uses Tape & Reel format while LP2951ACMM-3.3/NOPB uses Cut Tape & Digi-Reel. Functional performance in the circuit is unchanged.

Q: What is the difference between LP2951CMMX-3.3/NOPB and LP2951CMM-3.3/NOPB?

A: Both are Texas Instruments parametric equivalents with identical electrical characteristics. LP2951CMMX-3.3/NOPB uses Cut Tape & Digi-Reel packaging, while LP2951CMM-3.3/NOPB uses Tape & Reel packaging. Selection depends on procurement and assembly requirements.

Q: Is the onsemi LP2951ACDM-3.3RG a direct substitute?

A: Yes. The LP2951ACDM-3.3RG meets all critical electrical parameters and shares the same package geometry. It offers improved dropout voltage (0.45V vs. 0.6V) and lower supply current (12 mA vs. 14 mA). It is suitable for direct substitution in applications where these enhanced specifications are beneficial or neutral.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed parts, including the main part and all substitutes, are ROHS3 compliant with MSL Level 1 rating, meeting environmental and reliability standards.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: Yes. All parts use identical 8-TSSOP, 8-MSOP package geometry with 0.118" width and 3.00mm dimensions. PCB footprints and solder reflow profiles are compatible across all listed parts.

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