LP3984IMF-2.0/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3984IMF-2.0/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 2V output at 150mA. This device operates as a positive fixed regulator with integrated enable control and protection features including over-temperature and short-circuit protection. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across output voltage, output current capability, input voltage range, package type, and control features while meeting modern compliance standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3984IMF-2.0/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage (Fixed)	2V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.12V @ 150mA
Quiescent Current (Iq)	125 µA
Package Type	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP3984IMF-2.0/NOPB are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Fixed output voltage of 2V
Output current capability of 150mA or greater
Maximum input voltage of 6V or greater
SOT-23-5 package compatibility
Enable control feature
Surface mount technology
ROHS3 compliance

Secondary Compatibility Factors:

Voltage dropout characteristics
Quiescent current consumption
Operating temperature range
Protection feature set
Product status (active preferred for long-term availability)

Substitute parts are grouped into two categories: direct replacements with enhanced specifications (higher current output, lower quiescent current) and functionally equivalent alternatives that meet all electrical and mechanical requirements while offering improved performance characteristics or better long-term availability.

Parameter Comparison

Parameter	LP3984IMF-2.0/NOPB	BU20TD3WG-TR	RT9169H-20GB	S-1315A20-M5T1U3	S-1315B20-M5T1U3	S-1315C20-M5T1U3	S-1315D20-M5T1U3
Manufacturer	Texas Instruments	Rohm Semiconductor	Richtek USA Inc.	ABLIC Inc.	ABLIC Inc.	ABLIC Inc.	ABLIC Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Output Voltage (Fixed)	2V	2V	2V	2V	2V	2V	2V
Output Current	150mA	200mA	100mA	200mA	200mA	200mA	200mA
Input Voltage (Max)	6V	6V	6V	5.5V	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.12V @ 150mA	0.6V @ 200mA	0.6V @ 100mA	0.344V @ 200mA	0.344V @ 200mA	0.344V @ 200mA	0.344V @ 200mA
Quiescent Current (Iq)	125 µA	60 µA	7 µA	1 µA	1 µA	1 µA	1 µA
Package Type	SOT-23-5	5-SSOP	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Control Features	Enable	Enable	Enable	Enable	Enable	Enable	Enable
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current	Over Current	Over Current	Over Current	Over Current
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute Candidates (Recommended for New Designs):

The S-1315 series from ABLIC Inc. (S-1315A20-M5T1U3, S-1315B20-M5T1U3, S-1315C20-M5T1U3, S-1315D20-M5T1U3) represents the optimal substitute group. All variants maintain the 2V fixed output voltage, deliver 200mA output current (exceeding the original 150mA specification), operate within the 6V maximum input range, and are housed in SOT-23-5 packages. These parts feature significantly lower quiescent current (1 µA versus 125 µA), improved voltage dropout characteristics (0.344V @ 200mA), and maintain ROHS3 compliance with unlimited moisture sensitivity rating. All S-1315 variants are currently in active production status, ensuring long-term availability and supply chain stability.

Secondary Substitute Candidates:

BU20TD3WG-TR from Rohm Semiconductor meets all electrical requirements with 200mA output current and 2V fixed output. However, the 5-SSOP package differs from the original SOT-23-5, requiring PCB layout modification. This part is active and ROHS3 compliant but exhibits higher voltage dropout (0.6V @ 200mA) compared to the S-1315 series.

RT9169H-20GB from Richtek USA Inc. maintains SOT-23-5 package compatibility and 2V output voltage but delivers only 100mA output current, falling below the original 150mA specification. This part is suitable only for applications with reduced current requirements. Moisture sensitivity level 3 (168 hours) requires controlled storage conditions compared to the original level 1 rating.

Temperature Range Consideration:

All substitute parts operate within -40°C to 85°C, which is narrower than the original LP3984IMF-2.0/NOPB range of -40°C to 125°C. Applications requiring operation above 85°C require design review and alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can the S-1315 series parts directly replace the LP3984IMF-2.0/NOPB without PCB modifications?

A: Yes. The S-1315 series (all variants) maintains identical SOT-23-5 package pinout and footprint compatibility. No PCB layout changes are required. Pin-for-pin substitution is possible with no design modifications.

Q: What is the difference between S-1315A20-M5T1U3, S-1315B20-M5T1U3, S-1315C20-M5T1U3, and S-1315D20-M5T1U3?

A: All four variants share identical electrical specifications: 2V fixed output, 200mA output current, 0.344V dropout @ 200mA, 1 µA quiescent current, and SOT-23-5 packaging. The letter designations (A, B, C, D) represent different manufacturing batches or internal revisions within the S-1315 product line. Selection among these variants is interchangeable from an engineering perspective.

Q: Why does the BU20TD3WG-TR use a 5-SSOP package instead of SOT-23-5?

A: The 5-SSOP package is Rohm Semiconductor's standard surface-mount package for this regulator class. While electrically equivalent, the 5-SSOP footprint differs from SOT-23-5, requiring PCB redesign. The S-1315 series is preferred when package compatibility is required.

Q: Is the RT9169H-20GB suitable as a substitute if my application only requires 100mA output current?

A: Yes, if your circuit design operates at or below 100mA. The RT9169H-20GB meets all other electrical and compliance requirements. However, the original LP3984IMF-2.0/NOPB specification is 150mA, so this part represents a downgrade in current capability. Verify that your application does not exceed 100mA before selection.

Q: What is the impact of the lower quiescent current in substitute parts?

A: The S-1315 series and BU20TD3WG-TR feature significantly lower quiescent current (1 µA and 60 µA respectively) compared to the original 125 µA. This reduces standby power consumption and heat dissipation, providing improved efficiency in battery-powered or thermally constrained applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original LP3984IMF-2.0/NOPB compliance status.

Q: What is the moisture sensitivity difference between MSL 1 and MSL 3?

A: MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 Hours) requires that the component be used within 168 hours of package opening in uncontrolled humidity environments, or stored in dry conditions. The S-1315 series and BU20TD3WG-TR carry MSL 1, while RT9169H-20GB carries MSL 3. For standard manufacturing environments, MSL 1 is preferred.

Q: Can I use these substitutes in applications requiring operation above 85°C?

A: No. All substitute parts are rated to maximum 85°C operating temperature, compared to the original 125°C. Applications requiring higher temperature operation require alternative component selection outside this substitute group.

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