LP2951-30DRGR Equivalent & Substitute Parts

Part Overview

The LP2951-30DRGR is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This Surface Mount device delivers 100mA output current in an 8-SON (3x3) package with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this regulator topology.

Substiute Parts

LP2951-30DRGR

Texas InstrumentsIn Stock: 3271LP2951-30DRGR Datasheet

Current PartRFQ

LP2951-33DRGR

Texas InstrumentsIn Stock: 23224LP2951-33DRGR Datasheet

MFR RecommendedRFQ

RT2560Q-33GSP

Richtek USA Inc.In Stock: 1762RT2560Q-33GSP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951-30DRGR are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output Configuration: Positive
• Number of Regulators: 1
• Current - Output: 100mA
• Voltage - Input (Max): 30V or greater
• Voltage - Output (Min/Fixed): Compatible with 1.235V to 3V range
• Voltage - Output (Max): 30V or greater
• Package / Case: Surface Mount with compatible pinout
• Protection Features: Over Current and Over Temperature minimum
• Operating Temperature: -40°C minimum to 125°C maximum

Identified Substitutes:

1. LP2951-33DRGR (Texas Instruments) – Same manufacturer, same base product series, identical electrical specifications with fixed 3.3V output. Active product status provides superior supply chain continuity.

2. RT2560Q-33GSP (Richtek USA Inc.) – Alternative manufacturer with compatible output current (100mA), input voltage rating (36V), and protection features. Fixed 3.3V output. Automotive-grade qualification (AEC-Q100) provides additional reliability assurance for demanding applications.

Parameter Comparison

Engineering Selection Recommendations

LP2951-33DRGR is the primary recommended substitute. It maintains identical electrical performance specifications, package form factor, and protection feature set as the LP2951-30DRGR. As an Active product from the same manufacturer and product series, it provides the most direct replacement path with maximum design compatibility and superior long-term availability.

RT2560Q-33GSP serves as an alternative substitute for applications where higher input voltage tolerance (36V vs. 30V) or lower quiescent current (5 µA vs. 120 µA) provides design advantages. This part carries AEC-Q100 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability assurance. Package form factor differs (8-SOIC vs. 8-WFDFN), requiring PCB layout modification. Operating temperature maximum is reduced to 85°C, which may limit use in high-temperature environments.

Both substitute parts maintain ROHS3 compliance and are currently in active production status, ensuring supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can LP2951-33DRGR directly replace LP2951-30DRGR without PCB modifications?

A: Yes. Both parts share identical package geometry (8-WFDFN Exposed Pad), pinout, electrical specifications, and protection features. No PCB layout changes are required.

Q: What is the key difference between LP2951-30DRGR and LP2951-33DRGR?

A: The primary difference is the fixed output voltage: LP2951-30DRGR provides 3V output, while LP2951-33DRGR provides 3.3V output. Both support adjustable configurations and share identical input voltage ratings, current capacity, and thermal specifications.

Q: Is RT2560Q-33GSP suitable for high-temperature applications?

A: RT2560Q-33GSP operates to a maximum of 85°C junction temperature, compared to 125°C for the LP2951 series. Applications requiring operation above 85°C should use LP2951-33DRGR instead.

Q: Does RT2560Q-33GSP require PCB layout changes?

A: Yes. RT2560Q-33GSP uses an 8-SOIC package (0.154", 3.90mm width) versus the 8-WFDFN package of the LP2951-30DRGR. PCB footprint and layout modifications are necessary.

Q: What is the quiescent current difference between these parts?

A: LP2951-30DRGR and LP2951-33DRGR both draw 120 µA quiescent current. RT2560Q-33GSP draws only 5 µA, providing significant power savings in battery-powered or low-power standby applications.

Q: Are all three parts RoHS compliant?

A: Yes. LP2951-30DRGR, LP2951-33DRGR, and RT2560Q-33GSP are all ROHS3 compliant.

Q: Which substitute is recommended for new designs?

A: LP2951-33DRGR is recommended for new designs requiring direct compatibility with existing LP2951-30DRGR layouts. RT2560Q-33GSP is suitable for new designs where lower quiescent current or automotive qualification provides specific advantages and PCB layout modifications are acceptable.