LP2951CNG Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP2951CNG is a linear voltage regulator IC from onsemi designed for positive adjustable (fixed) output applications with a maximum output current of 100mA. This device operates across an input voltage range of up to 30V and provides output voltage adjustment from 1.235V to 30V with a maximum dropout voltage of 0.45V at 100mA. The LP2951CNG is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951CNG
Manufacturer	onsemi
Category	Power Management (PMIC)
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
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Current - Supply (Max)	12 mA
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2951CNG is determined by electrical and functional equivalence across the following critical parameters:

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
Voltage Dropout (Max): 0.45V @ 100mA
Current - Output: 100mA
Current - Quiescent (Iq): 120 µA
Current - Supply (Max): 12 mA
Protection Features: Over Current, Over Temperature
Operating Temperature: -40°C ~ 125°C
Base Product Number: LP2951
RoHS Status: ROHS3 Compliant

The LP2951CDR2G maintains identical electrical specifications and regulatory compliance. The primary difference is packaging format: the original LP2951CNG uses through-hole 8-DIP mounting, while the LP2951CDR2G employs surface-mount 8-SOIC technology. Both devices are manufactured by onsemi under the LP2951 base product series.

Parameter Comparison

Parameter	LP2951CNG	LP2951CDR2G	Match
Manufacturer	onsemi	onsemi	✓
Output Configuration	Positive	Positive	✓
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	✓
Number of Regulators	1	1	✓
Voltage - Input (Max)	30V	30V	✓
Voltage - Output (Min/Fixed)	1.235V (5V)	1.235V (5V)	✓
Voltage - Output (Max)	30V	30V	✓
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	✓
Current - Output	100mA	100mA	✓
Current - Quiescent (Iq)	120 µA	120 µA	✓
Current - Supply (Max)	12 mA	12 mA	✓
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	✓
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	✓
Package / Case	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm Width)	Different
Mounting Type	Through Hole	Surface Mount	Different
Product Status	Obsolete	Active	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	✓

Engineering Selection Recommendations

The LP2951CDR2G is an electrically equivalent substitute for the LP2951CNG. Both devices maintain identical electrical performance specifications, regulatory compliance certifications (ROHS3), and moisture sensitivity ratings. The LP2951CDR2G carries active product status from onsemi, ensuring continued availability and manufacturing support compared to the obsolete LP2951CNG.

Selection between these parts depends on circuit board design requirements. The LP2951CNG requires through-hole PCB mounting and is suitable for breadboard prototyping or legacy board designs. The LP2951CDR2G requires surface-mount assembly capability and is appropriate for modern production designs with reduced board footprint requirements. Both parts are manufactured by onsemi under the LP2951 base product series and share identical die technology.

Frequently Asked Questions (FAQ)

Q: Can LP2951CDR2G replace LP2951CNG in existing designs?

A: Electrical replacement is possible. The LP2951CDR2G provides identical voltage regulation performance, output current capability, and protection features. However, PCB layout modification is required due to package format differences: LP2951CNG uses 8-DIP through-hole mounting while LP2951CDR2G uses 8-SOIC surface-mount technology. Schematic connections remain unchanged.

Q: What are the key differences between LP2951CNG and LP2951CDR2G?

A: The devices are electrically identical across all specified parameters. The primary differences are packaging format and mounting technology. LP2951CNG is through-hole 8-DIP; LP2951CDR2G is surface-mount 8-SOIC. Product status differs: LP2951CNG is obsolete while LP2951CDR2G is active.

Q: Are both parts RoHS compliant?

A: Yes. Both LP2951CNG and LP2951CDR2G are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the output current capability of these regulators?

A: Both the LP2951CNG and LP2951CDR2G provide a maximum output current of 100mA with a maximum dropout voltage of 0.45V at this current level.

Q: Can these parts be used for adjustable or fixed voltage output?

A: Yes. Both LP2951CNG and LP2951CDR2G support adjustable (fixed) output configuration, allowing output voltage selection from 1.235V to 30V depending on external resistor network configuration.

Q: What is the operating temperature range?

A: Both devices operate across -40°C to 125°C, suitable for industrial and commercial temperature environments.

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