LP2981AIM5-5.0 Equivalent & Substitute Parts

Part Overview

The LP2981AIM5-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 5V output at 100mA with a maximum input voltage of 16V and operates across the temperature range of -40°C to 125°C. The part is mounted in a SOT-23-5 surface mount package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

The LP2981AIM5-5.0 is currently listed as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
PSRR	63dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP2981AIM5-5.0 are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Fixed output voltage of 5V
Output current capability of 100mA
Maximum input voltage of 16V
Dropout voltage of 0.37V @ 100mA
Quiescent current of 95 µA
SOT-23-5 package configuration
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current, over-temperature, and short-circuit protection

Parametric Equivalent Parts maintain all critical electrical specifications and package requirements. These parts are direct functional replacements with identical performance characteristics.

Packaging Variants include Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) options. These represent the same electrical component in different supply formats and do not affect circuit functionality.

Product Status Considerations range from Active to Last Time Buy to Obsolete. Active parts offer ongoing availability; Last Time Buy parts have limited remaining stock; Obsolete parts are no longer manufactured.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory (Pcs)
LP2981AIM5-5.0	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	1986
LP2981-50DBVR	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	17200
LP2981-50DBVT	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	1000300
LP2981A-50DBVR	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	9400
LP2981A-50DBVT	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	3400
LP2981AIM5-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	1410
LP2981AIM5X-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	6500
LP2981IM5-5.0	National Semiconductor	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	11000
LP2981IM5-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	20520
LP2981IM5X-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	6640
LD2980ABM50TR	STMicroelectronics	5V	50mA	16V	0.225V @ 50mA	150 µA	SOT-23-5	Active	18360

Engineering Selection Recommendations

Primary Substitutes (Full Parametric Equivalents):

The LP2981-50DBVR, LP2981A-50DBVR, LP2981AIM5-5.0/NOPB, LP2981AIM5X-5.0/NOPB, LP2981IM5-5.0, LP2981IM5-5.0/NOPB, and LP2981IM5X-5.0/NOPB are direct parametric equivalents to the LP2981AIM5-5.0. All maintain identical electrical specifications including 5V fixed output, 100mA output current, 0.37V dropout voltage, and 95 µA quiescent current. These parts are manufactured by Texas Instruments or National Semiconductor and are available in Active product status with substantial inventory levels.

The LP2981-50DBVT is classified as Last Time Buy with the highest inventory availability (1,000,300 pcs). This status indicates limited future availability and should be considered for immediate procurement if long-term supply is required.

Compliance and Certifications:

All primary substitutes carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original LP2981AIM5-5.0. Moisture Sensitivity Level (MSL) is rated at 1 (Unlimited) for all primary equivalents, indicating no moisture-related handling restrictions.

Packaging Considerations:

Substitutes are available in Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats. Selection should align with procurement and assembly requirements. The /NOPB designation indicates lead-free plating compliance.

Limited Current Alternative:

The LD2980ABM50TR from STMicroelectronics is a reduced-current variant (50mA output) with different electrical characteristics. This part is suitable only for applications where 50mA output current is sufficient and lower quiescent current (150 µA) is acceptable. The dropout voltage is lower at 0.225V @ 50mA, but protection features exclude short-circuit protection.

Frequently Asked Questions (FAQ)

Q: Can LP2981-50DBVR be used as a direct replacement for LP2981AIM5-5.0?

A: Yes. The LP2981-50DBVR is a parametric equivalent with identical output voltage (5V), output current (100mA), dropout voltage (0.37V @ 100mA), and quiescent current (95 µA). Both use the SOT-23-5 package and operate across -40°C to 125°C. The primary difference is product status: LP2981-50DBVR is Active while LP2981AIM5-5.0 is Obsolete.

Q: What is the difference between LP2981AIM5-5.0/NOPB and LP2981AIM5-5.0?

A: The /NOPB designation indicates lead-free plating compliance. Electrical specifications and package configuration are identical. The /NOPB variant is currently Active with 1,410 pcs in inventory.

Q: Why is LD2980ABM50TR listed as a substitute if it has different current ratings?

A: The LD2980ABM50TR is listed as a manufacturer-recommended alternative but is not a full parametric equivalent. It delivers 50mA output current versus the 100mA of the LP2981AIM5-5.0. This part is suitable only for applications where reduced output current is acceptable.

Q: Are there any differences in protection features between the primary substitutes?

A: All primary substitutes (LP2981 series variants) include over-current, over-temperature, and short-circuit protection. The LD2980ABM50TR omits short-circuit protection.

Q: What packaging options are available for the LP2981 substitutes?

A: Substitutes are available in Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats. Selection depends on procurement volume and assembly line requirements. All variants use the SOT-23-5 package configuration.

Q: Which substitute has the highest current inventory?

A: LP2981-50DBVT has the highest inventory at 1,000,300 pcs but is classified as Last Time Buy. For Active status parts, LP2981IM5-5.0/NOPB has 20,520 pcs available.

Q: Are all substitutes RoHS3 compliant?

A: All primary LP2981 series substitutes are RoHS3 compliant. The LD2980ABM50TR is also RoHS3 compliant.

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