LP2951CMMX-3.0 Equivalent & Substitute Parts

Part Overview

The LP2951CMMX-3.0 is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable (fixed) output power management IC with 100mA output capability in an 8-VSSOP surface mount package. The main part is currently listed as obsolete, which necessitates identification of active equivalent and substitute parts to maintain design continuity and ensure component availability for production and field replacement 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 (3V)
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
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2951CMMX-3.0 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Output configuration (Positive)
Output type (Adjustable/Fixed)
Number of regulators (1)
Maximum input voltage (30V)
Output voltage range (1.235V to 29V)
Maximum dropout voltage (0.6V @ 100mA)
Output current (100mA)
Quiescent current (120 µA)
Control features (Enable)
Protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range (-40°C ~ 125°C)

Mechanical Equivalence Criteria:

Mounting type (Surface Mount)
Package type (8-TSSOP, 8-MSOP, 0.118" width, 3.00mm)

Substitute parts are grouped into two categories:

Category 1: Texas Instruments Direct Equivalents (Parametric Equivalents) These parts maintain identical electrical and mechanical specifications with the main part. Differences exist only in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Obsolete). All Texas Instruments LP2951 variants with the -3.0 suffix designation meet full parametric equivalence.

Category 2: Cross-Manufacturer Equivalent (onsemi LP2951ACDM-3.0) The onsemi LP2951ACDM-3.0 series shares the same base product number and core electrical specifications. However, this part is classified as Fixed output type rather than Adjustable (Fixed), and features a reduced maximum supply current (12 mA vs. 14 mA). The onsemi variant includes automotive qualification (AEC-Q100) and carries active product status.

Parameter Comparison

Parameter	LP2951CMMX-3.0	LP2951ACMM-3.0/NOPB	LP2951ACMMX-3.0/NOPB	LP2951CMM-3.0/NOPB	LP2951CMMX-3.0/NOPB	LP2951ACDM-3.0RG
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Fixed
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (3V)	1.235V (3V)	1.235V (3V)	1.235V (3V)	1.235V (3V)	3V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	14 mA	14 mA	12 mA
Control Features	Enable	Enable	Enable	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-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	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	3300 Pcs	3100 Pcs	4618 Pcs	11200 Pcs	7100 Pcs	4864 Pcs

Engineering Selection Recommendations

For Direct Replacement (Texas Instruments LP2951 Series):

The Texas Instruments LP2951ACMM-3.0/NOPB, LP2951ACMMX-3.0/NOPB, LP2951CMM-3.0/NOPB, and LP2951CMMX-3.0/NOPB are all active product variants that provide complete parametric equivalence to the obsolete LP2951CMMX-3.0. All four parts are ROHS3 compliant, addressing regulatory requirements that the original part does not meet. Selection among these four variants depends on packaging requirements: Cut Tape (CT) & Digi-Reel for the ACMM variant, or Tape & Reel (TR) for the ACMMX, CMM, and CMMX variants. The CMM-3.0/NOPB variant offers the highest inventory availability at 11,200 pieces.

For Cross-Manufacturer Substitution (onsemi LP2951ACDM-3.0RG):

The onsemi LP2951ACDM-3.0RG is an active product with automotive qualification (AEC-Q100) and ROHS3 compliance. This part differs from the main specification in two respects: output type is Fixed rather than Adjustable (Fixed), and maximum supply current is 12 mA rather than 14 mA. The onsemi variant features improved dropout voltage performance (0.45V vs. 0.6V @ 100mA). This part is suitable only for applications where the fixed 3V output is acceptable and where the reduced supply current specification does not conflict with circuit requirements. The absence of short circuit protection in the onsemi variant represents an additional functional difference.

Compliance Considerations:

All active substitute parts meet ROHS3 compliance, whereas the original LP2951CMMX-3.0 is RoHS non-compliant. For new designs or production requiring regulatory compliance, selection of any active Texas Instruments variant is mandatory.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM-3.0/NOPB be used as a direct replacement for LP2951CMMX-3.0?

A: Yes. Both parts are Texas Instruments products with identical electrical specifications and operating parameters. The difference is packaging format: ACMM uses Cut Tape & Digi-Reel packaging, while CMMX uses Tape & Reel. PCB footprint and electrical performance are equivalent.

Q: What is the difference between "Adjustable (Fixed)" and "Fixed" output types?

A: The LP2951CMMX-3.0 and Texas Instruments variants support both adjustable output voltage configuration and fixed output voltage operation. The onsemi LP2951ACDM-3.0RG is configured for fixed 3V output only and does not support adjustable voltage operation. If your circuit requires adjustable output voltage capability, the onsemi part is not suitable.

Q: Why does the onsemi LP2951ACDM-3.0RG have lower maximum supply current?

A: The onsemi variant specifies 12 mA maximum supply current versus 14 mA for Texas Instruments parts. This specification difference reflects the device design and does not indicate reduced performance. Verify that your application's supply current requirements do not exceed 12 mA if using the onsemi part.

Q: Is the onsemi LP2951ACDM-3.0RG suitable for automotive applications?

A: Yes. The onsemi part carries AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. The Texas Instruments variants do not carry automotive qualification.

Q: What is the significance of the "/NOPB" suffix in part numbers?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming ROHS3 compliance. Parts without this suffix may contain lead and are not ROHS3 compliant.

Q: Can I substitute LP2951CMM-3.0/NOPB for LP2951CMMX-3.0 in existing designs?

A: Yes. Both parts are Texas Instruments products with identical electrical and mechanical specifications. The difference is packaging format: CMM uses standard Tape & Reel, while CMMX uses extended Tape & Reel. Electrical performance and PCB compatibility are equivalent.

Q: Does the improved dropout voltage of the onsemi part (0.45V vs. 0.6V) affect circuit design?

A: Lower dropout voltage provides improved efficiency and reduced heat dissipation. If your circuit is designed for 0.6V dropout, the onsemi part's 0.45V specification is a beneficial improvement. However, if your circuit specifically requires 0.6V dropout characteristics, verify that the lower dropout voltage does not cause unintended circuit behavior.

Q: Why is the original LP2951CMMX-3.0 listed as obsolete?

A: Product obsolescence reflects Texas Instruments' end-of-life decision for this specific variant. Active equivalent parts from Texas Instruments (ACMM, ACMMX, CMM, CMMX variants) provide continued support for this product family with improved compliance status (ROHS3).

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