LP3984IMF-3.1 Equivalent & Substitute Parts

Part Overview

The LP3984IMF-3.1 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 3.1V output at 150mA in a SOT-23-5 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across an industrial temperature range of -40°C to 125°C and includes integrated protection features for over-temperature and short-circuit conditions.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.1V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.12V @ 150mA
Package Type	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LP3984IMF-3.1 is determined by the following critical parameters:

Fixed output voltage of 3.1V
Output current capability of 150mA or greater
SOT-23-5 package compatibility
Surface mount technology
Enable control feature
Operating temperature range support

Three substitute parts meet these criteria with varying performance characteristics:

S-1132B31-M5T1U (ABLIC Inc.) provides enhanced current capability at 300mA, exceeding the original specification.

S-1167B31-M5T1U (ABLIC Inc.) matches the 150mA output current specification with improved quiescent current performance.

XC6504A311MR-G (Torex Semiconductor Ltd) maintains the 150mA output current in a compatible package footprint.

Parameter Comparison

Parameter	LP3984IMF-3.1	S-1132B31-M5T1U	S-1167B31-M5T1U	XC6504A311MR-G
Manufacturer	Texas Instruments	ABLIC Inc.	ABLIC Inc.	Torex Semiconductor Ltd
Output Voltage	3.1V	3.1V	3.1V	3.1V
Output Current	150mA	300mA	150mA	150mA
Input Voltage (Max)	6V	6.5V	6.5V	6V
Voltage Dropout (Max)	0.12V @ 150mA	0.19V @ 100mA	0.23V @ 100mA	0.67V @ 150mA
Quiescent Current	125 µA	1 µA	900 nA	1.5 µA
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-25
Product Status	Obsolete	Active	Active	Active
Operating Temperature	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S-1167B31-M5T1U is the primary substitute for direct replacement in applications requiring 150mA output current. This part maintains electrical equivalence with the LP3984IMF-3.1 while offering active product status, ROHS3 compliance, and significantly reduced quiescent current (900 nA versus 125 µA). The SOT-23-5 package ensures PCB layout compatibility without redesign.

S-1132B31-M5T1U is suitable for applications where increased current headroom is beneficial. The 300mA output capability provides design margin, though this part operates at a reduced maximum temperature of 85°C compared to the original 125°C specification.

XC6504A311MR-G serves as an alternative when ABLIC parts are unavailable. This Torex device maintains 150mA output current and active product status with ROHS3 compliance. The SOT-25 package requires PCB footprint verification, and the higher dropout voltage (0.67V @ 150mA) may impact thermal performance in power-constrained applications.

All three substitutes are currently in active production with established supply chains, addressing the obsolescence of the original LP3984IMF-3.1.

Frequently Asked Questions (FAQ)

Q: Can S-1132B31-M5T1U replace LP3984IMF-3.1 in all applications?

A: S-1132B31-M5T1U is electrically compatible for applications requiring up to 150mA output current. The higher 300mA rating provides additional margin. However, the maximum operating temperature is reduced to 85°C; applications requiring operation above 85°C require alternative selection.

Q: What is the difference between S-1167B31-M5T1U and S-1132B31-M5T1U?

A: Both are ABLIC regulators with 3.1V fixed output and SOT-23-5 packaging. S-1167B31-M5T1U is rated for 150mA output current with 900 nA quiescent current. S-1132B31-M5T1U is rated for 300mA output current with 1 µA quiescent current. Select S-1167B31-M5T1U for direct 150mA replacement; select S-1132B31-M5T1U when higher current capacity is required.

Q: Is XC6504A311MR-G a pin-for-pin replacement?

A: XC6504A311MR-G uses SOT-25 packaging versus the SOT-23-5 of the original part. While both are 5-pin surface mount packages, the pinout and footprint differ. PCB layout verification is required before implementation.

Q: What are the compliance differences between the original and substitutes?

A: The LP3984IMF-3.1 is RoHS non-compliant. All three substitutes (S-1132B31-M5T1U, S-1167B31-M5T1U, and XC6504A311MR-G) are ROHS3 compliant, meeting current environmental regulations for new designs.

Q: How does dropout voltage affect circuit performance?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. The LP3984IMF-3.1 specifies 0.12V @ 150mA. S-1167B31-M5T1U specifies 0.23V @ 100mA, and XC6504A311MR-G specifies 0.67V @ 150mA. Higher dropout voltage increases power dissipation and may require higher input voltage in current-limited applications.

Q: Can these parts be used interchangeably on the same PCB?

A: S-1167B31-M5T1U and S-1132B31-M5T1U share identical SOT-23-5 footprints and are interchangeable at the PCB level. XC6504A311MR-G requires footprint modification due to SOT-25 packaging. Verify pinout compatibility before assembly.

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