LP2951CS-L-5-0/TR Equivalent & Substitute Parts

Part Overview

The LP2951CS-L-5-0/TR is a linear voltage regulator IC from MaxLinear, Inc., classified as a positive adjustable (fixed) output power management IC with 100mA output current capability in an 8-SOIC surface mount package. This device is currently in active product status with 2691 units in stock. Substitute parts are necessary when the original part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when higher output current capacity is needed for specific application requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2951CS-L-5-0/TR
Manufacturer	MaxLinear, Inc.
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (5V)
Voltage - Output (Max)	29V
Current - Output	100mA
Voltage Dropout (Max)	0.45V @ 100mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the LP2951CS-L-5-0/TR is determined by the following critical parameters:

Primary Substitution Criteria:

Output configuration: Positive
Output type: Adjustable (Fixed)
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Voltage - Input (Max): 30V minimum
Voltage - Output (Min/Fixed): 1.235V or lower minimum
Voltage - Output (Max): 29V or higher maximum
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount

Current Output Consideration: Parts with 100mA output current are direct equivalents. Parts with 150mA output current (MIC2951 series) are functional substitutes with enhanced current capability, suitable for applications requiring higher output current within the same voltage and thermal specifications.

Packaging Format: The original part uses Tape & Reel (TR) packaging. Substitutes in Cut Tape (CT) & Digi-Reel® or Tube packaging are electrically equivalent but differ in delivery format and handling requirements.

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage Dropout @ Rated Current	Quiescent Current (Iq)	Package Format	Product Status	RoHS Status
LP2951CS-L-5-0/TR	MaxLinear, Inc.	100mA	0.45V @ 100mA	170 µA	Tape & Reel (TR)	Active	RoHS Compliant
NCV2951CDR2G	onsemi	100mA	0.45V @ 100mA	Not specified	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
LP2951-50D	Texas Instruments	100mA	0.6V @ 100mA	120 µA	Tube	Last Time Buy	ROHS3 Compliant
LP2951-50DR	Texas Instruments	100mA	0.6V @ 100mA	120 µA	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
LP2951ACDR2G	onsemi	100mA	0.45V @ 100mA	120 µA	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
MIC2951-02YM	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Tube	Active	ROHS3 Compliant
MIC2951-02YM-TR	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
MIC2951-03YM	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Tube	Active	ROHS3 Compliant
MIC2951-03YM-TR	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
MIC2951-3.3YM	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Tube	Active	ROHS3 Compliant
MIC2951-3.3YM-TR	Microchip Technology	150mA	0.6V @ 150mA	300 µA	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (100mA Output Current): LP2951-50DR from Texas Instruments and LP2951ACDR2G from onsemi are the primary direct substitutes. Both maintain 100mA output current specification and are in active product status. LP2951-50DR offers the advantage of higher inventory availability (44,250 units) and active status, making it the preferred choice for new designs. NCV2951CDR2G from onsemi provides equivalent performance with automotive-grade qualification (AEC-Q100) for applications requiring automotive compliance.

Enhanced Current Capacity Substitutes (150mA Output Current): The MIC2951 series from Microchip Technology provides 150mA output current while maintaining compatibility with the same 8-SOIC package, input voltage range, and operating temperature specifications. These parts are suitable for applications where the original 100mA specification is marginal or where future current headroom is required. All MIC2951 variants are in active product status with substantial inventory availability.

Packaging Considerations: For manufacturing processes requiring Tape & Reel format, MIC2951-02YM-TR, MIC2951-03YM-TR, and MIC2951-3.3YM-TR are available. For standard cut tape or tube packaging, alternative variants are available from all manufacturers listed.

Compliance Status: All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. LP2951-50D carries Last Time Buy status and should not be selected for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 150mA rated part (MIC2951 series) as a direct replacement for the 100mA LP2951CS-L-5-0/TR?

A: Yes. The MIC2951 series maintains identical package geometry (8-SOIC), input voltage range (30V maximum), output voltage specifications (1.24V minimum, 29V maximum), and operating temperature range (-40°C ~ 125°C). The higher 150mA output current rating does not create compatibility issues in applications designed for 100mA operation. The part will function identically at or below 100mA output current.

Q: What is the difference between Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube packaging?

A: These are delivery and handling formats only. Electrically and functionally, the parts are identical. Tape & Reel and Cut Tape & Digi-Reel® are automated assembly formats suitable for high-volume manufacturing. Tube packaging is used for lower-volume or manual assembly processes. Selection depends on manufacturing equipment and volume requirements, not electrical performance.

Q: Why does LP2951-50D show "Last Time Buy" status?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this part number. While inventory may still be available, new designs should not be based on this part. Use LP2951-50DR (active status) or equivalent alternatives from other manufacturers instead.

Q: Are there differences in quiescent current (Iq) between substitute options?

A: Yes. The original LP2951CS-L-5-0/TR specifies 170 µA quiescent current. Texas Instruments LP2951-50D and LP2951-50DR specify 120 µA. onsemi LP2951ACDR2G specifies 120 µA. Microchip MIC2951 series specifies 300 µA. For battery-powered or low-power standby applications where quiescent current is critical, select parts with lower Iq specifications (120 µA variants).

Q: What is the significance of voltage dropout specifications?

A: Voltage dropout determines the minimum input-to-output voltage differential required for proper regulation at rated output current. The original part specifies 0.45V dropout at 100mA. Texas Instruments variants specify 0.6V dropout. Lower dropout is advantageous in applications with limited input voltage headroom. For applications with adequate input voltage margin, both specifications are functionally equivalent.

Q: Can I substitute parts with different fixed output voltages (e.g., 3.3V vs. 5V)?

A: No. Output voltage is application-specific and determined by circuit design requirements. MIC2951-3.3YM and MIC2951-3.3YM-TR are fixed at 3.3V output and are not interchangeable with 5V variants. Select the substitute part with the output voltage matching your application requirement.

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