LP5951MF-2.0 Equivalent & Substitute Parts

Part Overview

The LP5951MF-2.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 2V output at 150mA in a surface-mount SOT-23-5 package. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from both Texas Instruments and ABLIC Inc. are available to maintain circuit functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP5951MF-2.0
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	2V
Output Current	150mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.35V @ 150mA
Quiescent Current (Iq)	55 µA
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LP5951MF-2.0 is determined by the following critical parameters:

Fixed output voltage of 2V
Output current capability of 150mA or greater
Maximum input voltage of 5.5V
Surface-mount SOT-23-5 package compatibility
Positive output configuration with enable control feature
Protection features including overcurrent and thermal shutdown

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments): LP5951MF-2.0/NOPB and LP5951MFX-2.0/NOPB maintain identical electrical specifications to the main part while offering active product status and improved RoHS compliance.

Manufacturer-Recommended Alternatives (ABLIC Inc.): The S-1312 and S-1313 series provide functional equivalence with variations in quiescent current, dropout voltage, and operating temperature range. The S-1312 series maintains 150mA output current, while the S-1313 series increases output current to 200mA.

Parameter Comparison

Parameter	LP5951MF-2.0	LP5951MF-2.0/NOPB	LP5951MFX-2.0/NOPB	S-1312A20-M5T1U3	S-1313A20-M5T1U3
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	ABLIC Inc.	ABLIC Inc.
Output Voltage (Fixed)	2V	2V	2V	2V	2V
Output Current	150mA	150mA	150mA	150mA	200mA
Input Voltage (Max)	5.5V	5.5V	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.35V @ 150mA	0.35V @ 150mA	0.35V @ 150mA	0.36V @ 100mA	0.49V @ 100mA
Quiescent Current (Iq)	55 µA	55 µA	55 µA	30 µA	1.35 µA
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LP5951MF-2.0/NOPB and LP5951MFX-2.0/NOPB are parametric equivalents with active product status and ROHS3 compliance. These are the preferred choices when maintaining exact electrical performance is required. Both are available in Tape & Reel packaging.

For RoHS Compliance Upgrade: If regulatory compliance with ROHS3 is mandatory, the Texas Instruments parametric equivalents (LP5951MF-2.0/NOPB, LP5951MFX-2.0/NOPB) provide direct substitution while meeting modern environmental standards. The original LP5951MF-2.0 is RoHS non-compliant.

For Extended Temperature Range: The LP5951MF-2.0 operates from -40°C to 125°C. ABLIC S-1312 and S-1313 series are limited to -40°C to 85°C. Verify application temperature requirements before selecting ABLIC alternatives.

For Lower Quiescent Current: The S-1313 series (S-1313A20-M5T1U3, S-1313B20-M5T1U3, S-1313C20-M5T1U3, S-1313D20-M5T1U3) offers significantly reduced quiescent current at 1.35 µA compared to 55 µA in the original part. This is beneficial for battery-powered applications. However, output current increases to 200mA and dropout voltage increases to 0.49V @ 100mA.

For Matched Current Rating: The S-1312 series (S-1312A20-M5T1U3, S-1312B20-M5T1U3, S-1312C20-M5T1U3, S-1312D20-M5T1U3) maintains 150mA output current with lower quiescent current (30 µA) and slightly higher dropout voltage (0.36V @ 100mA) compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can LP5951MF-2.0/NOPB directly replace LP5951MF-2.0? A: Yes. LP5951MF-2.0/NOPB is a parametric equivalent with identical electrical specifications. The primary differences are active product status and ROHS3 compliance. Packaging is Tape & Reel instead of the original specification.

Q: What is the difference between S-1312 and S-1313 series? A: Both series provide 2V fixed output in SOT-23-5 packages. The S-1312 series maintains 150mA output current with 30 µA quiescent current. The S-1313 series increases output current to 200mA with significantly lower quiescent current at 1.35 µA, but increases dropout voltage to 0.49V @ 100mA.

Q: Are ABLIC S-1312 and S-1313 parts suitable for high-temperature applications? A: ABLIC parts operate from -40°C to 85°C, which is narrower than the original LP5951MF-2.0 range of -40°C to 125°C. Verify your application's maximum operating temperature before substitution.

Q: Why is the original LP5951MF-2.0 marked as obsolete? A: The part is no longer in active production. Texas Instruments offers parametric equivalents (LP5951MF-2.0/NOPB and LP5951MFX-2.0/NOPB) as active alternatives with improved compliance status.

Q: Do all substitute parts use the same SOT-23-5 package? A: Yes. All listed substitute parts use SC-74A, SOT-753 package designation, which is equivalent to SOT-23-5. Pin-to-pin compatibility is maintained across all alternatives.

Q: Which substitute offers the best RoHS compliance? A: All active substitute parts (LP5951MF-2.0/NOPB, LP5951MFX-2.0/NOPB, and all ABLIC S-1312/S-1313 variants) are ROHS3 compliant. The original LP5951MF-2.0 is RoHS non-compliant.

Q: Can I use S-1313D20-M5T1U3 if my circuit only requires 150mA? A: Yes. The S-1313D20-M5T1U3 is rated for 200mA output current, so it can safely supply 150mA. However, verify that the increased quiescent current (1.35 µA vs. 55 µA) and higher dropout voltage (0.49V @ 100mA vs. 0.35V @ 150mA) are acceptable for your application.

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