LP5951MF-1.3 Equivalent & Substitute Parts

Part Overview

The LP5951MF-1.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.3V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output configuration with integrated enable control and comprehensive protection features including overcurrent, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP5951MF-1.3
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.3V
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 (SOT-23-5)
Operating Temperature	-40°C ~ 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LP5951MF-1.3 are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output voltage: 1.3V fixed
Output current capability: 150mA minimum
Input voltage maximum: 5.5V
Package type: SOT-23-5 (SC-74A, SOT-753)
Mounting type: Surface Mount
Control features: Enable function
Protection features: Overcurrent and thermal protection

Substitution Categories:

Category 1: Parametric Equivalents (Texas Instruments) LP5951MF-1.3/NOPB and LP5951MFX-1.3/NOPB are direct parametric equivalents from Texas Instruments with identical electrical specifications. These parts differ only in packaging format (Tape & Reel) and product status (Active vs. Obsolete), making them suitable direct replacements with improved availability and RoHS3 compliance.

Category 2: Manufacturer Recommended Alternatives (ABLIC Inc.) The S-1312 series (S-1312A13-M5T1U3, S-1312B13-M5T1U3, S-1312C13-M5T1U3, S-1312D13-M5T1U3) and S-1313 series (S-1313A13-M5T1U3, S-1313B13-M5T1U3, S-1313C13-M5T1U3, S-1313D13-M5T1U3) provide functional substitution with variations in output current and dropout voltage characteristics. These parts maintain the 1.3V fixed output, SOT-23-5 package, and enable control function while offering improved quiescent current performance and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Iq (µA)	Operating Temp	Product Status	RoHS Status	Package
LP5951MF-1.3	Texas Instruments	1.3V	150mA	0.35V @ 150mA	55	-40°C ~ 125°C	Obsolete	RoHS non-compliant	SOT-23-5
LP5951MF-1.3/NOPB	Texas Instruments	1.3V	150mA	0.35V @ 150mA	55	-40°C ~ 125°C	Active	ROHS3 Compliant	SOT-23-5
LP5951MFX-1.3/NOPB	Texas Instruments	1.3V	150mA	0.35V @ 150mA	55	-40°C ~ 125°C	Active	ROHS3 Compliant	SOT-23-5
S-1312A13-M5T1U3	ABLIC Inc.	1.3V	150mA	0.56V @ 100mA	30	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1312B13-M5T1U3	ABLIC Inc.	1.3V	150mA	0.56V @ 100mA	30	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1312C13-M5T1U3	ABLIC Inc.	1.3V	150mA	0.56V @ 100mA	30	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1312D13-M5T1U3	ABLIC Inc.	1.3V	150mA	0.56V @ 100mA	30	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1313A13-M5T1U3	ABLIC Inc.	1.3V	175mA	1.11V @ 100mA	1.35	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1313B13-M5T1U3	ABLIC Inc.	1.3V	175mA	1.11V @ 100mA	1.35	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1313C13-M5T1U3	ABLIC Inc.	1.3V	175mA	1.11V @ 100mA	1.35	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5
S-1313D13-M5T1U3	ABLIC Inc.	1.3V	175mA	1.11V @ 100mA	1.35	-40°C ~ 85°C	Active	ROHS3 Compliant	SOT-23-5

Engineering Selection Recommendations

Primary Recommendation: LP5951MF-1.3/NOPB or LP5951MFX-1.3/NOPB

These Texas Instruments parts provide identical electrical performance to the obsolete LP5951MF-1.3 with the advantage of active product status and ROHS3 compliance. Both maintain the 0.35V dropout voltage specification and 55µA quiescent current. Selection between these two variants depends on packaging requirements: LP5951MF-1.3/NOPB is available in Tape & Reel format, while LP5951MFX-1.3/NOPB offers the same specifications with extended availability.

Secondary Recommendation: S-1312 Series (ABLIC Inc.)

The S-1312A13-M5T1U3, S-1312B13-M5T1U3, S-1312C13-M5T1U3, and S-1312D13-M5T1U3 are suitable alternatives for applications where reduced quiescent current (30µA vs. 55µA) is beneficial. These parts maintain 150mA output current capability and 1.3V fixed output. The higher dropout voltage (0.56V @ 100mA) requires verification against circuit design margins. Operating temperature range is reduced to -40°C ~ 85°C. All variants are ROHS3 compliant and actively produced.

Tertiary Recommendation: S-1313 Series (ABLIC Inc.)

The S-1313A13-M5T1U3, S-1313B13-M5T1U3, S-1313C13-M5T1U3, and S-1313D13-M5T1U3 provide increased output current capability (175mA) with significantly reduced quiescent current (1.35µA). These parts are suitable for applications requiring higher current delivery or ultra-low standby power consumption. The substantially higher dropout voltage (1.11V @ 100mA) and reduced operating temperature range (-40°C ~ 85°C) must be evaluated against circuit requirements. All variants are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP5951MF-1.3 with LP5951MF-1.3/NOPB?

A: Yes. LP5951MF-1.3/NOPB is a parametric equivalent with identical electrical specifications. The primary differences are packaging format (Tape & Reel) and product status (Active vs. Obsolete). Pin configuration and functional behavior remain unchanged, enabling direct substitution in existing designs.

Q: What are the key differences between Texas Instruments LP5951 variants and ABLIC S-1312/S-1313 series?

A: The LP5951 variants maintain 0.35V dropout voltage and 55µA quiescent current across the -40°C to 125°C operating range. The S-1312 series reduces quiescent current to 30µA but increases dropout voltage to 0.56V and limits operating temperature to -40°C to 85°C. The S-1313 series further reduces quiescent current to 1.35µA and increases output current to 175mA, but with 1.11V dropout voltage. Selection depends on circuit power budget and thermal requirements.

Q: Are all substitute parts available in SOT-23-5 packaging?

A: Yes. All listed substitute parts use SOT-23-5 (SC-74A, SOT-753) surface mount packaging, maintaining mechanical compatibility with the original LP5951MF-1.3 footprint.

Q: Which substitute parts are RoHS3 compliant?

A: LP5951MF-1.3/NOPB, LP5951MFX-1.3/NOPB, and all ABLIC S-1312 and S-1313 variants are ROHS3 compliant. The original LP5951MF-1.3 is RoHS non-compliant.

Q: Can I use S-1313 series parts if my circuit requires 150mA output current?

A: The S-1313 series is rated for 175mA output current, which exceeds the 150mA requirement. However, the significantly higher dropout voltage (1.11V vs. 0.35V) and reduced operating temperature range must be evaluated against your circuit design margins and thermal environment.

Q: What is the difference between S-1312 and S-1313 series variants (A, B, C, D)?

A: Within each series, the A, B, C, and D variants represent different packaging or tape configuration options. Electrical specifications remain identical within each series. Selection should be based on your procurement and assembly process requirements.

Q: Is the operating temperature range reduction from 125°C to 85°C significant for ABLIC alternatives?

A: This depends on your application environment. If your design operates above 85°C ambient or requires thermal margin to 125°C, the ABLIC alternatives may not be suitable. For standard industrial applications operating below 85°C, this limitation is not restrictive.

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