LP2951CDR2 Equivalent & Substitute Parts

Part Overview

The LP2951CDR2 is a linear voltage regulator IC from onsemi designed for low-dropout (LDO) regulation applications. It delivers 100mA output current in an 8-SOIC surface mount package and supports both fixed and adjustable output voltage configurations. The device operates across an industrial temperature range of -40°C to 125°C.

The LP2951CDR2 is classified as obsolete. Identifying equivalent substitute parts is essential for design continuity, procurement planning, and ensuring long-term product availability in applications where this regulator is currently deployed.

Substiute Parts

LP2951CDR2

onsemiIn Stock: 2839LP2951CDR2 Datasheet

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LP2951CDR2G

onsemiIn Stock: 23969LP2951CDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2951CDR2 is determined by the following critical parameters:

• Package Compatibility: Both the main part and substitute must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without layout modifications.
• Output Current Rating: The substitute must deliver a minimum of 100mA output current to meet application power delivery requirements.
• Operating Temperature Range: The substitute must support the full -40°C to 125°C industrial temperature range to maintain thermal performance across all operating conditions.
• Regulator Configuration: The substitute must support linear voltage regulation with adjustable or fixed output voltage capability.
• Manufacturer Continuity: onsemi LP2951 series devices maintain functional and pin compatibility within the product line.

The LP2951CDR2G qualifies as a direct substitute based on these parameters. It shares identical package geometry, output current capability, temperature range, and regulator architecture while offering improved product status and compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The LP2951CDR2G is the qualified substitute for the obsolete LP2951CDR2. Selection is based on the following engineering criteria:

Product Status: The LP2951CDR2G maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete LP2951CDR2.

Regulatory Compliance: The LP2951CDR2G achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original LP2951CDR2 is RoHS non-compliant, making the substitute preferable for new designs and compliance-sensitive applications.

Functional Equivalence: Both devices share identical package geometry, output current rating, and operating temperature specifications. Pin-level compatibility is maintained within the onsemi LP2951 series architecture.

Electrical Performance: The LP2951CDR2G provides specified electrical characteristics including maximum input voltage (30V), adjustable output voltage range (1.235V to 30V), and integrated protection features (over-current and over-temperature) that ensure robust operation in the intended application.

Frequently Asked Questions (FAQ)

Q: Can the LP2951CDR2G be used as a direct replacement for the LP2951CDR2 without PCB modifications?

A: Yes. Both devices use the 8-SOIC (0.154", 3.90mm Width) surface mount package with identical pin assignments. No PCB layout changes are required for substitution.

Q: What are the key differences between the LP2951CDR2 and LP2951CDR2G?

A: The primary differences are product status and regulatory compliance. The LP2951CDR2G is in active production and ROHS3 compliant, while the LP2951CDR2 is obsolete and RoHS non-compliant. Both devices deliver 100mA output current across the -40°C to 125°C temperature range in identical packages.

Q: Does the LP2951CDR2G support the same output voltage configurations as the LP2951CDR2?

A: Yes. The LP2951CDR2G supports adjustable and fixed output voltage configurations consistent with the LP2951 series architecture. The specified output voltage range is 1.235V to 30V.

Q: What is the maximum input voltage for the LP2951CDR2G?

A: The maximum input voltage is 30V. Ensure that input supply voltages do not exceed this rating in your application circuit.

Q: Are there any thermal or performance advantages to using the LP2951CDR2G?

A: The LP2951CDR2G specifies a maximum dropout voltage of 0.45V at 100mA and quiescent current of 120 µA. These parameters ensure efficient regulation and low standby power consumption. Verify these specifications against your application requirements.

Q: What packaging options are available for the LP2951CDR2G?

A: The LP2951CDR2G is supplied in Cut Tape (CT) and Digi-Reel® packaging formats. Confirm packaging availability with your supplier based on procurement volume and handling requirements.