LP2951CDM-3.3R2G Equivalent & Substitute Parts

Part Overview

The LP2951CDM-3.3R2G is a linear voltage regulator IC from onsemi, delivering a fixed 3.3V output at 100mA in an 8-MSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The LP2951 series provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for applications requiring stable 3.3V power delivery in space-constrained surface-mount designs.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	3.3V
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LP2951CDM-3.3R2G is determined by the following critical parameters:

Output voltage: 3.3V fixed
Output current capability: 100mA minimum
Maximum input voltage: 30V
Package compatibility: 8-MSOP or equivalent 8-pin surface-mount
Operating temperature range: -40°C to 125°C
Protection features: Over-current and over-temperature protection

Substitute parts must maintain these electrical and mechanical specifications to ensure functional equivalence. The LP2951 base product number identifies the core regulator topology across all variants.

Parameter Comparison

Parameter	LP2951CDM-3.3R2G (Main)	LP2951ACDM-3.3RG	LP2951ACMM-3.3/NOPB	LP2951ACMMX-3.3/NOPB	LP2951CMM-3.3/NOPB	LP2951CMMX-3.3/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Fixed	Fixed	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	3.3V	3.3V	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 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)	12 mA	12 mA	14 mA	14 mA	14 mA	14 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LP2951ACDM-3.3RG is the direct equivalent from onsemi, maintaining identical electrical specifications and active product status. This part is the primary choice for direct replacement of the obsolete LP2951CDM-3.3R2G.

LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, LP2951CMM-3.3/NOPB, and LP2951CMMX-3.3/NOPB are Texas Instruments variants of the LP2951 regulator. These parts deliver the same 3.3V fixed output at 100mA with identical operating temperature range and package compatibility. All variants are active products with ROHS3 compliance and MSL 1 rating.

Differences between onsemi and Texas Instruments variants include maximum supply current (12 mA versus 14 mA) and dropout voltage (0.45V versus 0.6V at 100mA). Texas Instruments variants include short-circuit protection in addition to over-current and over-temperature protection. Packaging options differ by supplier: onsemi offers 8-MSOP, while Texas Instruments variants are available in Cut Tape or Tape & Reel configurations.

All substitute parts maintain the 8-pin surface-mount package footprint and are suitable for applications requiring 3.3V regulation with 100mA output capacity.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACDM-3.3RG directly replace LP2951CDM-3.3R2G?

A: Yes. LP2951ACDM-3.3RG is the active equivalent from onsemi with identical electrical specifications, output voltage, current rating, and package configuration. The primary difference is product status: LP2951ACDM-3.3RG is active while LP2951CDM-3.3R2G is obsolete.

Q: What are the differences between onsemi and Texas Instruments LP2951 variants?

A: Both manufacturers produce functionally equivalent 3.3V 100mA regulators in 8-MSOP packages. Texas Instruments variants feature 0.15V higher dropout voltage (0.6V versus 0.45V) and 2 mA higher maximum supply current (14 mA versus 12 mA). Texas Instruments parts include short-circuit protection; onsemi parts include over-current and over-temperature protection. Packaging options differ: onsemi supplies 8-MSOP, while Texas Instruments offers Cut Tape or Tape & Reel configurations.

Q: Are all substitute parts pin-compatible with the original LP2951CDM-3.3R2G?

A: Yes. All listed substitute parts use the 8-MSOP package with identical pin configuration and footprint. PCB layout and schematic connections require no modification.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level) rating. All are classified under ECCN EAR99 and HTSUS 8542.39.0001.

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

A: LP2951ACDM-3.3RG from onsemi is the direct replacement. For applications where Texas Instruments supply chain preference exists, any of the four Texas Instruments variants (LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, LP2951CMM-3.3/NOPB, LP2951CMMX-3.3/NOPB) are functionally equivalent. Selection between Cut Tape and Tape & Reel packaging depends on assembly requirements.

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