LP2951ACDG Equivalent & Substitute Parts

Part Overview

The LP2951ACDG is a linear voltage regulator IC from onsemi, designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The LP2951 series provides regulated output voltage from 1.235V to 30V with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable voltage regulation.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (5V)
Voltage - Output (Max)	30V
Current - Output	100mA
Voltage Dropout (Max)	0.45V @ 100mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACDG are qualified based on the following critical parameters:

Electrical Compatibility:

Output configuration: Positive
Output type: Adjustable (Fixed)
Number of regulators: 1
Voltage input maximum: 30V
Current output: 100mA
Operating temperature range: -40°C ~ 125°C
Package / Case: 8-SOIC (0.154", 3.90mm Width)

Mechanical Compatibility:

Surface mount mounting type
Identical 8-SOIC package footprint

Substitute parts must maintain these core parameters to ensure functional and mechanical compatibility. Variations in quiescent current, dropout voltage, and control features are acceptable provided the primary electrical specifications remain within the defined range.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Input (Max)	Voltage Output (Min/Fixed)	Voltage Output (Max)	Current Output	Dropout Voltage (Max)	Quiescent Current (Iq)	Operating Temperature	Package	Inventory
LP2951ACDG	onsemi	Obsolete	30V	1.235V (5V)	30V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	8-SOIC	1194 Pcs
LP2951ACDR2G	onsemi	Active	30V	1.235V (5V)	30V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	8-SOIC	45400 Pcs
LP2951CS-L-5-0/TR	MaxLinear, Inc.	Active	30V	1.235V (5V)	29V	100mA	0.45V @ 100mA	170 µA	-40°C ~ 125°C	8-SOIC	2691 Pcs
LP2951-02YM	Microchip Technology	Active	30V	1.24V (5V)	29V	100mA	0.6V @ 100mA	150 µA	-40°C ~ 125°C	8-SOIC	36400 Pcs
LP2951-02YM-TR	Microchip Technology	Active	30V	1.24V (5V)	29V	100mA	0.6V @ 100mA	150 µA	-40°C ~ 125°C	8-SOIC	20400 Pcs
LP2951CS-L-3-3/TR	MaxLinear, Inc.	Active	30V	3.3V	—	100mA	0.45V @ 100mA	170 µA	-40°C ~ 125°C	8-SOIC	7163 Pcs

Engineering Selection Recommendations

Primary Recommendation: LP2951ACDR2G

The LP2951ACDR2G from onsemi is the direct active equivalent to the obsolete LP2951ACDG. This part maintains identical electrical specifications including voltage input/output ranges, current output, and dropout voltage. As an onsemi product, it preserves the original design lineage and is RoHS3 compliant. With 45,400 units in stock, this part offers the highest availability and is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: LP2951-02YM or LP2951-02YM-TR

The Microchip Technology LP2951-02YM series provides functional equivalence with acceptable parameter variations. The quiescent current is slightly higher (150 µA vs. 120 µA), and dropout voltage is marginally increased (0.6V vs. 0.45V @ 100mA). These devices include additional control features (Enable, Error Flag) not present in the original part. Both tube and tape & reel packaging options are available with substantial inventory (36,400 and 20,400 units respectively).

Alternative Recommendation: LP2951CS-L-5-0/TR

The MaxLinear LP2951CS-L-5-0/TR offers functional compatibility with adjustable output configuration. Quiescent current is elevated to 170 µA, and maximum output voltage is limited to 29V. This part includes Enable control feature and is RoHS compliant. Inventory availability is lower at 2,691 units.

Fixed Output Option: LP2951CS-L-3-3/TR

For applications requiring fixed 3.3V output, the LP2951CS-L-3-3/TR from MaxLinear provides a fixed-output variant. This part is suitable only for designs specifically requiring 3.3V regulation and is not a general-purpose substitute for adjustable-output applications.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACDR2G directly replace LP2951ACDG without circuit modifications?

A: Yes. The LP2951ACDR2G maintains identical electrical and mechanical specifications, including voltage ranges, current output, dropout voltage, and 8-SOIC package footprint. No circuit modifications are required.

Q: What are the key differences between onsemi and Microchip versions?

A: The Microchip LP2951-02YM series exhibits higher quiescent current (150 µA vs. 120 µA) and greater dropout voltage (0.6V vs. 0.45V @ 100mA). The Microchip versions include additional control features (Enable, Error Flag) not present in the onsemi original. Both are functionally compatible for most applications.

Q: Are all substitute parts RoHS compliant?

A: LP2951ACDR2G is RoHS3 compliant. LP2951-02YM and LP2951-02YM-TR are RoHS3 compliant. LP2951CS-L-5-0/TR and LP2951CS-L-3-3/TR are RoHS compliant. All substitute parts meet RoHS requirements.

Q: What packaging options are available for substitutes?

A: LP2951ACDR2G is available in Cut Tape (CT) & Digi-Reel packaging. LP2951-02YM is supplied in Tube packaging. LP2951-02YM-TR is available in Cut Tape (CT) & Digi-Reel packaging. LP2951CS-L-5-0/TR and LP2951CS-L-3-3/TR are supplied in Tape & Reel (TR) packaging.

Q: Can I use LP2951CS-L-3-3/TR as a substitute for adjustable output applications?

A: No. The LP2951CS-L-3-3/TR is a fixed 3.3V output device and is not suitable for applications requiring adjustable or alternative fixed output voltages. Use only for designs specifically requiring 3.3V regulation.

Q: Which substitute offers the best inventory availability?

A: LP2951ACDR2G offers the highest inventory with 45,400 units in stock, followed by LP2951-02YM with 36,400 units.

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