LP2951CS-L-5-0 Equivalent & Substitute Parts

Part Overview

The LP2951CS-L-5-0 is a linear voltage regulator IC from MaxLinear, Inc., designed for positive adjustable (fixed) output regulation with 100mA current capacity in an 8-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The device operates across a wide input voltage range (up to 30V) with output adjustability from 1.235V to 29V, incorporating over-current and over-temperature protection features suitable for general-purpose power management applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951CS-L-5-0
Manufacturer	MaxLinear, Inc.
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)	29V
Voltage Dropout (Max)	0.45V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	170 µA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
RoHS Status	RoHS Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the LP2951CS-L-5-0 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — pinout and footprint compatibility
Output Configuration: Positive
Output Type: Adjustable (Fixed)
Number of Regulators: 1
Voltage - Input (Max): 30V minimum
Voltage - Output (Min/Fixed): 1.235V or lower (5V fixed option)
Voltage - Output (Max): 29V or higher
Current - Output: 100mA or higher
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount
Protection Features: Over Current and Over Temperature minimum

Substitution Categories:

Category A — Direct Electrical & Mechanical Equivalents (100mA Output): These parts match all critical parameters including 100mA output current rating and identical voltage specifications.

NCV2951CDR2G (onsemi)
LP2951-50D (Texas Instruments)
LP2951-50DR (Texas Instruments)
LP2951ACDR2G (onsemi)

Category B — Enhanced Current Capacity Substitutes (150mA Output): These parts exceed the 100mA output requirement with 150mA capability, maintaining all other critical parameters. Higher current capacity provides design margin and is electrically compatible for applications requiring ≤100mA.

MIC2951-02YM (Microchip Technology)
MIC2951-02YM-TR (Microchip Technology)
MIC2951-03YM (Microchip Technology)
MIC2951-03YM-TR (Microchip Technology)
MIC2951-3.3YM (Microchip Technology)
MIC2951-3.3YM-TR (Microchip Technology)

Parameter Comparison

Part Number	Manufacturer	Package	Output Current	Voltage Dropout @ Rated Current	Quiescent Current (Iq)	Product Status	Compliance
LP2951CS-L-5-0	MaxLinear, Inc.	8-SOIC	100mA	0.45V @ 100mA	170 µA	Discontinued	RoHS Compliant
NCV2951CDR2G	onsemi	8-SOIC	100mA	0.45V @ 100mA	—	Active	ROHS3 Compliant
LP2951-50D	Texas Instruments	8-SOIC	100mA	0.6V @ 100mA	120 µA	Last Time Buy	ROHS3 Compliant
LP2951-50DR	Texas Instruments	8-SOIC	100mA	0.6V @ 100mA	120 µA	Active	ROHS3 Compliant
LP2951ACDR2G	onsemi	8-SOIC	100mA	0.45V @ 100mA	120 µA	Active	ROHS3 Compliant
MIC2951-02YM	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant
MIC2951-02YM-TR	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant
MIC2951-03YM	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant
MIC2951-03YM-TR	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant
MIC2951-3.3YM	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant
MIC2951-3.3YM-TR	Microchip Technology	8-SOIC	150mA	0.6V @ 150mA	300 µA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LP2951-50DR (Texas Instruments) is the primary recommendation. This part is currently active with the highest inventory availability (44,250 pcs), ROHS3 compliance, and identical electrical performance to the original LP2951CS-L-5-0. The 0.6V dropout specification at 100mA is marginally higher than the original 0.45V but remains within acceptable operating parameters for most applications.

LP2951ACDR2G (onsemi) provides an alternative with matching 0.45V dropout specification and active product status (45,400 pcs available), offering superior dropout performance if thermal margin is critical.

NCV2951CDR2G (onsemi) matches the original 0.45V dropout specification with automotive-grade qualification (AEC-Q100) and active status, suitable for applications requiring automotive compliance.

For Enhanced Current Capacity:

MIC2951-02YM-TR or MIC2951-03YM-TR (Microchip Technology) provide 150mA output capability in cut-tape packaging with active status. These are suitable for applications where current headroom is beneficial, though quiescent current is higher (300 µA vs. 170 µA original). The fixed output variants (MIC2951-02YM for 5V, MIC2951-3.3YM for 3.3V) are available in tube packaging.

Packaging Considerations:

All substitutes maintain the 8-SOIC (0.154", 3.90mm Width) package, ensuring direct PCB footprint compatibility. Packaging format options (tube vs. cut-tape/digi-reel) do not affect electrical performance and should be selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2951-50DR directly replace LP2951CS-L-5-0 without circuit modification?

A: Yes. LP2951-50DR maintains identical package, pinout, output configuration, voltage range, and current rating. The 0.6V dropout specification (vs. 0.45V original) represents a minor increase in voltage loss under full load but does not require circuit changes for standard applications. Verify that your power supply headroom accommodates the slightly higher dropout if operating near minimum input voltage limits.

Q: What is the difference between MIC2951-02YM and MIC2951-03YM?

A: Both parts are electrically identical with 150mA output capability. The designation difference reflects internal configuration variants. Both are suitable substitutes for the LP2951CS-L-5-0 in applications requiring ≤100mA output.

Q: Are the Microchip MIC2951 parts compatible with the original LP2951CS-L-5-0 pinout?

A: Yes. All MIC2951 variants maintain the 8-SOIC pinout and are pin-compatible. The 150mA output rating exceeds the original 100mA specification, providing design margin. Quiescent current is higher (300 µA vs. 170 µA), which may impact low-power standby applications.

Q: What is the difference between tube and cut-tape packaging?

A: Tube packaging (e.g., MIC2951-02YM) is suitable for manual assembly or lower-volume production. Cut-tape/digi-reel packaging (e.g., MIC2951-02YM-TR) is optimized for automated pick-and-place assembly. Electrical performance is identical; selection depends on assembly process requirements.

Q: Why do some substitutes have higher quiescent current specifications?

A: Quiescent current (Iq) represents the regulator's internal power consumption when supplying no load current. Higher Iq values (e.g., 300 µA for MIC2951 vs. 170 µA for LP2951CS-L-5-0) increase standby power consumption. For battery-powered or low-power applications, select substitutes with lower Iq ratings (LP2951-50DR at 120 µA or LP2951ACDR2G at 120 µA).

Q: Is NCV2951CDR2G suitable for automotive applications?

A: NCV2951CDR2G carries AEC-Q100 automotive qualification, making it suitable for automotive-grade designs. If your application requires automotive compliance, this part is the appropriate choice among the substitutes listed.

Q: Can I use LP2951-50D (tube packaging) instead of LP2951-50DR (cut-tape)?

A: Yes. Both are electrically identical Texas Instruments LP2951-50 variants with identical electrical specifications. LP2951-50D is in "Last Time Buy" status with lower inventory (3,978 pcs), while LP2951-50DR is active with significantly higher availability (44,250 pcs). For new designs, LP2951-50DR is the preferred choice.

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