LP3984IMFX-1.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3984IMFX-1.5/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.5V output at 150mA in SOT-23-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device features enable control, over-temperature and short-circuit protection, with a maximum input voltage of 6V and dropout voltage of 0.12V at 150mA.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.5V
Output Current	150mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.12V @ 150mA
Quiescent Current	125 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C ~ 125°C
Control Features	Enable
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP3984IMFX-1.5/NOPB is determined by the following critical parameters:

Output Voltage: 1.5V fixed output is the primary selection criterion
Output Current Capability: Minimum 150mA required; higher current ratings are acceptable
Package Type: SOT-23-5 (SC-74A) surface mount packaging
Input Voltage Range: Maximum 6V input compatibility
Operating Temperature: -40°C to 125°C preferred for full compatibility
Control and Protection Features: Enable function and thermal protection required

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (150mA Output Current) Parts with 150mA output current matching the original specification: MIC5247-1.5YM5-TR

Category B - Enhanced Substitutes (200mA+ Output Current) Parts with higher output current capability (200mA or greater) providing improved performance margin: BU15TD3WG-TR, S-1315A15-M5T1U3, S-1315B15-M5T1U3, S-1315C15-M5T1U3

Category C - Higher Current Capability (300mA Output Current) Parts with significantly higher output current for applications requiring additional headroom: MIC5318-1.5YD5-TR

Category D - Lower Current Alternatives (100mA Output Current) Parts with reduced output current suitable for lower-power applications: RT9169H-15GB

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
LP3984IMFX-1.5/NOPB	Texas Instruments	1.5V	150mA	6V	0.12V @ 150mA	125 µA	SOT-23-5	-40°C ~ 125°C	Obsolete
BU15TD3WG-TR	Rohm Semiconductor	1.5V	200mA	6V	0.7V @ 200mA	60 µA	5-SSOP	-40°C ~ 85°C	Active
MIC5247-1.5YM5-TR	Microchip Technology	1.5V	150mA	6V	0.15V @ 150mA	150 µA	SOT-23-5	-40°C ~ 125°C	Active
MIC5318-1.5YD5-TR	Microchip Technology	1.5V	300mA	6V	Not specified	150 µA	TSOT-23-5	-40°C ~ 125°C	Active
RT9169H-15GB	Richtek USA Inc.	1.5V	100mA	6V	0.6V @ 100mA	7 µA	SOT-23-5	-40°C ~ 85°C	Active
S-1315A15-M5T1U3	ABLIC Inc.	1.5V	200mA	5.5V	0.486V @ 200mA	1 µA	SOT-23-5	-40°C ~ 85°C	Active
S-1315B15-M5T1U3	ABLIC Inc.	1.5V	200mA	5.5V	0.486V @ 200mA	1 µA	SOT-23-5	-40°C ~ 85°C	Active
S-1315C15-M5T1U3	ABLIC Inc.	1.5V	200mA	5.5V	0.486V @ 200mA	1 µA	SOT-23-5	-40°C ~ 85°C	Active

Engineering Selection Recommendations

For Direct Replacement with Identical Current Rating: MIC5247-1.5YM5-TR is the primary substitute, offering active product status, identical 150mA output current, SOT-23-5 packaging, and extended operating temperature range to 125°C matching the original specification. This part maintains full compatibility with existing PCB layouts and thermal requirements.

For Enhanced Performance with Higher Current Capability: BU15TD3WG-TR, S-1315A15-M5T1U3, S-1315B15-M5T1U3, and S-1315C15-M5T1U3 provide 200mA output current, offering improved design margin. All are active products with ROHS3 compliance. The ABLIC S-1315 series variants differ only in packaging format (Cut Tape vs. Tape & Reel) and maintain SOT-23-5 compatibility. Note that BU15TD3WG-TR uses 5-SSOP packaging and operates to 85°C maximum.

For Maximum Current Capability: MIC5318-1.5YD5-TR delivers 300mA output current in TSOT-23-5 (thin) packaging with active status and 125°C operating range. This part accommodates higher-power applications but requires PCB layout verification due to package variant differences.

For Lower-Power Applications: RT9169H-15GB provides 100mA output current with ultra-low quiescent current (7 µA) in standard SOT-23-5 packaging. Operating temperature is limited to 85°C maximum.

All recommended substitutes maintain ROHS3 compliance, EAR99 export classification, and unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MIC5247-1.5YM5-TR directly replace LP3984IMFX-1.5/NOPB without PCB modifications? A: Yes. Both parts use SOT-23-5 packaging, 1.5V output, 150mA current rating, and 6V maximum input voltage. Pin-to-pin compatibility is maintained. The MIC5247 offers superior dropout voltage (0.15V vs. 0.12V) and extended temperature operation to 125°C.

Q: What is the difference between S-1315A15-M5T1U3, S-1315B15-M5T1U3, and S-1315C15-M5T1U3? A: These three parts are electrically identical 1.5V/200mA regulators from ABLIC's S-1315 series. The differences are packaging format only: A variant uses Cut Tape (CT), while B and C variants use Tape & Reel (TR) packaging. All use SOT-23-5 surface mount packages.

Q: Why does BU15TD3WG-TR use 5-SSOP packaging instead of SOT-23-5? A: BU15TD3WG-TR from Rohm Semiconductor uses 5-SSOP packaging, which is physically different from SOT-23-5. While pin count and function are compatible, PCB footprint verification is required before substitution. This part is not recommended for direct drop-in replacement without layout review.

Q: Is MIC5318-1.5YD5-TR compatible with existing LP3984 PCB layouts? A: MIC5318 uses TSOT-23-5 (thin variant) packaging, which differs from standard SOT-23-5. Although pin-to-pin compatible, the thinner package profile may affect thermal performance and PCB layout. Verification is required before use.

Q: What is the maximum input voltage for S-1315 series parts? A: ABLIC S-1315 series regulators specify 5.5V maximum input voltage, compared to 6V for the original LP3984. This 0.5V difference may be significant in applications operating near the upper input voltage limit.

Q: Can RT9169H-15GB be used in applications requiring 150mA output current? A: No. RT9169H-15GB is rated for 100mA maximum output current, which is insufficient for the original 150mA specification. This part is suitable only for lower-power applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts carry ROHS3 compliance certification, matching the original LP3984IMFX-1.5/NOPB compliance status.

Q: What is the operating temperature range difference between substitutes? A: MIC5247-1.5YM5-TR and MIC5318-1.5YD5-TR maintain the original -40°C to 125°C range. BU15TD3WG-TR, RT9169H-15GB, and ABLIC S-1315 series parts are limited to -40°C to 85°C maximum operating temperature.

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