LP2981IM5-3.6 Equivalent & Substitute Parts

Part Overview

The LP2981IM5-3.6 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 3.6V at 100mA with a maximum input voltage of 16V and dropout voltage of 0.37V at full load. The device integrates over-current, over-temperature, and short-circuit protection with an enable control feature.

The main part LP2981IM5-3.6 carries an Obsolete product status. Identifying parametric equivalents and substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Number of Regulators	1
Voltage - Input (Max)	16V
Voltage - Output (Min/Fixed)	3.6V
Voltage Dropout (Max)	0.37V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	95 µA
Current - Supply (Max)	1.7 mA
PSRR	63dB (1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LP2981IM5-3.6 is determined by strict parametric matching across the following criteria:

Mandatory Matching Parameters:

Output Configuration: Positive
Output Type: Fixed
Voltage - Output (Min/Fixed): 3.6V
Voltage - Input (Max): 16V
Current - Output: 100mA
Voltage Dropout (Max): 0.37V @ 100mA
Package / Case: SC-74A, SOT-753
Supplier Device Package: SOT-23-5
Operating Temperature: -40°C ~ 125°C
Protection Features: Over Current, Over Temperature, Short Circuit
Control Features: Enable

All identified substitute parts match these parameters exactly. Variations in packaging format (Cut Tape, Tape & Reel, Bulk) and product status do not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Output (V)	Output (mA)	Input Max (V)	Dropout (V)	Iq (µA)	Package	RoHS Status
LP2981IM5-3.6	Texas Instruments	Obsolete	-	3.6	100	16	0.37	95	SOT-23-5	RoHS non-compliant
LP2981AIM5-3.6/NOPB	Texas Instruments	Last Time Buy	Cut Tape (CT)	3.6	100	16	0.37	95	SOT-23-5	ROHS3 Compliant
LP2981AIM5X-3.6/NOPB	Texas Instruments	Active	Tape & Reel (TR)	3.6	100	16	0.37	95	SOT-23-5	ROHS3 Compliant
LP2981IM5-3.6/NOPB	Texas Instruments	Last Time Buy	Cut Tape (CT)	3.6	100	16	0.37	95	SOT-23-5	ROHS3 Compliant
LP2981IM5X-3.6/NOPB	National Semiconductor	Active	Bulk	3.6	100	16	0.37	95	SOT-23-5	Not specified

Engineering Selection Recommendations

For New Designs and Active Production: LP2981AIM5X-3.6/NOPB is the preferred substitute. It maintains Active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance satisfies modern regulatory requirements for new component procurement.

For Maintenance and Repair Applications: LP2981IM5-3.6/NOPB or LP2981AIM5-3.6/NOPB are suitable alternatives. Both carry Last Time Buy status with confirmed inventory availability. ROHS3 compliance provides regulatory alignment for field replacements.

For Legacy System Support: LP2981IM5X-3.6/NOPB remains available in bulk packaging with Active status. This option supports ongoing maintenance of existing installations where the original part is no longer procurable.

All substitute parts are electrically and mechanically identical to the main part across all specified parameters. Selection should be based on product status, compliance requirements, and packaging format availability for your supply chain.

Frequently Asked Questions (FAQ)

Q: Can LP2981AIM5X-3.6/NOPB replace LP2981IM5-3.6 in existing designs? A: Yes. All electrical parameters, output voltage, current rating, dropout voltage, protection features, and package dimensions are identical. The difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Bulk packaging? A: These are packaging and delivery formats only. Cut Tape is individual strips, Tape & Reel is continuous reel format for automated assembly, and Bulk is loose components. Electrical and mechanical specifications remain unchanged.

Q: Is the LP2981IM5X-3.6/NOPB from National Semiconductor compatible with the Texas Instruments version? A: Yes. All parametric specifications match exactly. The manufacturer difference does not affect electrical or mechanical compatibility in this case.

Q: Why is RoHS compliance important for substitution? A: RoHS3 compliance indicates the part meets current environmental and regulatory standards. For new designs and procurement, ROHS3-compliant parts are required. For legacy systems, non-compliant parts may still function but do not meet modern regulatory requirements.

Q: Can I use LP2981IM5-3.6/NOPB if LP2981AIM5X-3.6/NOPB is unavailable? A: Yes. Both parts are parametric equivalents with identical electrical and mechanical specifications. LP2981IM5-3.6/NOPB carries Last Time Buy status, indicating limited future availability.

Q: What does "Last Time Buy" product status mean? A: Last Time Buy indicates the manufacturer will no longer produce the part after a specified date. Existing inventory may be available, but long-term supply cannot be guaranteed. For critical applications, transition to Active status parts is recommended.

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