LP2951CDM-3.0R2 Equivalent & Substitute Parts

Part Overview

The LP2951CDM-3.0R2 is a linear voltage regulator IC from onsemi, delivering a fixed 3V output at 100mA in an 8-MSOP surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across -40°C to 125°C with integrated over-current and over-temperature protection.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	3V
Voltage - Input (Max)	30V
Current - Output	100mA
Voltage Dropout (Max)	0.45V @ 100mA
Current - Quiescent (Iq)	120 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LP2951CDM-3.0R2 is determined by the following critical parameters:

Fixed 3V output voltage
100mA output current capability
30V maximum input voltage rating
8-MSOP package footprint compatibility
Surface mount technology
Operating temperature range -40°C to 125°C
Positive output configuration

Substitute parts must maintain electrical equivalence across these parameters. The LP2951 base product family shares the same functional architecture, allowing cross-manufacturer and packaging variants to serve as direct replacements when electrical specifications align.

Parameter Comparison

Parameter	LP2951CDM-3.0R2 (Main)	LP2951ACDM-3.0RG	LP2951ACMM-3.0/NOPB	LP2951ACMMX-3.0/NOPB	LP2951CMM-3.0/NOPB	LP2951CMMX-3.0/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Voltage (Fixed)	3V	3V	3V	3V	3V	3V
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA
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)
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

LP2951ACDM-3.0RG (onsemi, Tape & Reel) is the primary parametric equivalent. This part maintains identical electrical specifications to the main part while offering active product status and ROHS3 compliance. The onsemi manufacturer origin provides design continuity for existing onsemi-based supply chains.

LP2951ACMM-3.0/NOPB, LP2951ACMMX-3.0/NOPB, LP2951CMM-3.0/NOPB, and LP2951CMMX-3.0/NOPB (all Texas Instruments) are functionally equivalent alternatives. These parts deliver the same 3V fixed output at 100mA with identical quiescent current and operating temperature range. The Texas Instruments variants feature enhanced short-circuit protection and ROHS3 compliance. Voltage dropout increases to 0.6V at 100mA, which remains acceptable for most 3V regulation applications. Packaging variants (Cut Tape vs. Tape & Reel) accommodate different procurement and assembly workflows.

All substitute parts are active products with current manufacturing support, addressing the obsolescence status of the LP2951CDM-3.0R2.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACDM-3.0RG directly replace LP2951CDM-3.0R2 on existing PCBs?

A: Yes. Both parts use the 8-MSOP package with identical pinout and footprint. Electrical specifications are equivalent, including 3V fixed output, 100mA current capability, and -40°C to 125°C operating range.

Q: What is the difference between onsemi and Texas Instruments variants?

A: Both manufacturers produce LP2951-based regulators with equivalent core functionality. The onsemi LP2951ACDM-3.0RG maintains the original design lineage. Texas Instruments variants add short-circuit protection and offer different packaging options (Cut Tape vs. Tape & Reel). All are ROHS3 compliant and active products.

Q: Does the 0.15V increase in dropout voltage (0.45V to 0.6V) affect circuit performance?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. The increase from 0.45V to 0.6V at 100mA is within typical design margins for 3V regulation circuits. Applications with tight input voltage budgets should verify compatibility with specific power supply specifications.

Q: Are all substitute parts available in Tape & Reel packaging?

A: LP2951ACDM-3.0RG, LP2951ACMMX-3.0/NOPB, LP2951CMM-3.0/NOPB, and LP2951CMMX-3.0/NOPB are supplied in Tape & Reel. LP2951ACMM-3.0/NOPB is available in Cut Tape and Digi-Reel packaging. Packaging selection depends on production volume and assembly equipment compatibility.

Q: What compliance advantages do substitute parts offer?

A: All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements. The main part (LP2951CDM-3.0R2) is RoHS non-compliant. For new designs or products subject to RoHS directives, substitute parts provide regulatory alignment.

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