LP2951ACD-3.0 Equivalent & Substitute Parts

Part Overview

The LP2951ACD-3.0 is a linear voltage regulator IC from onsemi, configured as a positive fixed 3V output regulator with 100mA output current capability in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.

The LP2951 series provides regulated power supply functionality in compact form factor, suitable for applications requiring low-dropout voltage regulation with integrated over-current and over-temperature protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951ACD-3.0
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	3V
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LP2951ACD-3.0 is determined by the following critical parameters:

Output voltage configuration (Positive, Fixed 3V)
Maximum input voltage (30V)
Output current capability (100mA)
Voltage dropout specification (0.45V @ 100mA)
Quiescent current (120 µA)
Operating temperature range (-40°C ~ 125°C)
Package type (8-SOIC surface mount)
Protection features (Over Current, Over Temperature)

Parts are grouped into two categories:

Parametric Equivalent: LP2951CD-3.0G maintains identical electrical specifications and package configuration, with the primary difference being packaging format (Tube vs. original specification) and improved RoHS3 compliance status.

Similar Parts: LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB share the same base platform (LP2951 series) and package, but feature adjustable output voltage capability (1.235V to 29V) with enhanced control features (Enable pin) and additional protection (Short Circuit). These parts are active products from Texas Instruments and National Semiconductor, offering improved availability and compliance status.

Parameter Comparison

Parameter	LP2951ACD-3.0	LP2951CD-3.0G	LP2951ACM-3.0/NOPB	LP2951ACMX-3.0/NOPB	LP2951CMX-3.0/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Positive	Positive	Positive	Positive	Positive
Output Type	Fixed (3V)	Fixed (3V)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	3V	3V	1.235V (3V)	1.235V (3V)	1.235V (3V)
Voltage - Output (Max)	—	—	29V	29V	29V
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	12 mA	12 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)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	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
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	—	Tube	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Inventory Status	1060 Pcs New Original In Stock	900 Pcs New Original In Stock	8825 Pcs New Original In Stock	2538 Pcs New Original In Stock	4198 Pcs New Original In Stock

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent):

LP2951CD-3.0G is the direct parametric equivalent, maintaining identical electrical performance and package configuration. This part offers improved RoHS3 compliance status compared to the original LP2951ACD-3.0. Selection of this part is appropriate when design specifications require fixed 3V output with 0.45V maximum dropout at 100mA.

For Active Product Substitution:

LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB are active products from Texas Instruments and National Semiconductor. These parts feature adjustable output voltage capability and enhanced protection features (Short Circuit protection). All three maintain the same 8-SOIC package and core electrical specifications (100mA output, 120 µA quiescent current, -40°C to 125°C operating range).

Key differences from the original part:

Voltage dropout increases to 0.6V @ 100mA (compared to 0.45V)
Supply current increases to 14 mA maximum (compared to 12 mA)
Enhanced control features (Enable pin) and Short Circuit protection
Full RoHS3 compliance
Significantly higher inventory availability

Selection of these active parts is recommended for new designs or when long-term product availability is required. The adjustable output voltage capability provides design flexibility, and the enhanced protection features offer improved robustness.

Packaging Considerations:

LP2951ACM-3.0/NOPB: Tube packaging
LP2951ACMX-3.0/NOPB: Tape & Reel format for automated assembly
LP2951CMX-3.0/NOPB: Cut Tape & Digi-Reel format for mixed-volume applications

Frequently Asked Questions (FAQ)

Q: Can LP2951ACM-3.0/NOPB be used as a direct replacement for LP2951ACD-3.0?

A: LP2951ACM-3.0/NOPB is functionally compatible for applications requiring 3V fixed output. The part shares identical package, output current (100mA), quiescent current (120 µA), and operating temperature range. However, voltage dropout increases from 0.45V to 0.6V at 100mA, and supply current increases from 12 mA to 14 mA. These differences are acceptable in most applications but should be verified against specific circuit requirements.

Q: What is the difference between LP2951ACMX-3.0/NOPB and LP2951CMX-3.0/NOPB?

A: Both parts are electrically identical and use the same 8-SOIC package. The primary difference is packaging format: LP2951ACMX-3.0/NOPB is supplied in Tape & Reel format, while LP2951CMX-3.0/NOPB is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly volume and equipment compatibility.

Q: Why does LP2951CD-3.0G have lower inventory than the active Texas Instruments parts?

A: LP2951CD-3.0G is classified as obsolete, similar to the original LP2951ACD-3.0. Texas Instruments and National Semiconductor parts (LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, LP2951CMX-3.0/NOPB) are active products with ongoing production and higher inventory levels.

Q: Are all substitute parts RoHS3 compliant?

A: LP2951CD-3.0G, LP2951ACM-3.0/NOPB, LP2951ACMX-3.0/NOPB, and LP2951CMX-3.0/NOPB are all ROHS3 compliant. The original LP2951ACD-3.0 is RoHS non-compliant. For applications requiring RoHS compliance, any of the substitute parts are suitable.

Q: Can the adjustable output voltage feature of LP2951ACM-3.0/NOPB be configured for outputs other than 3V?

A: The LP2951ACM-3.0/NOPB features adjustable output voltage from 1.235V to 29V. However, this question addresses circuit design considerations beyond the scope of parametric substitution. Consult device datasheets for application circuit design guidance.

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

A: The "NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. This designation is standard for modern semiconductor components.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message