LP2981IM5X-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP2981IM5X-3.3/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 100mA with a maximum input voltage of 16V and operates across the industrial temperature range of -40°C to 125°C. The part is currently Active in product status with 12,302 units in stock.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific packaging preferences while maintaining functional compatibility within the defined electrical and mechanical parameters.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
Package / Case	SC-74A, SOT-753 (SOT-23-5)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2981IM5X-3.3/NOPB are classified into two categories based on electrical and mechanical compatibility:

Category 1: Parametric Equivalents (Texas Instruments LP2981 Series)

These parts maintain identical electrical specifications across all critical parameters: 3.3V fixed output, 100mA output current, 0.37V maximum dropout voltage at 100mA, 95 µA quiescent current, 63dB PSRR at 1kHz, and identical protection features (Over Current, Over Temperature, Short Circuit). All variants use the SOT-23-5 package and operate across -40°C to 125°C. Substitution is determined by packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active or Last Time Buy).

Parametric equivalent part numbers: LP2981-33DBVR, LP2981-33DBVT, LP2981A-33DBVR, LP2981A-33DBVT, LP2981A-33DBVTG4, LP2981AIM5-3.3/NOPB, LP2981AIM5X-3.3/NOPB, LP2981IM5-3.3/NOPB

Category 2: Manufacturer Recommended Alternatives (STMicroelectronics LD2980 Series)

These parts differ in output current rating (50mA versus 100mA) and quiescent current specification (150 µA versus 95 µA). The LD2980 series maintains identical input voltage maximum (16V), fixed output voltage (3.3V), operating temperature range (-40°C to 125°C), and SOT-23-5 package compatibility. Dropout voltage is lower at 0.225V @ 50mA. Protection features include Over Current and Over Temperature, with Short Circuit protection not specified.

Manufacturer recommended part numbers: LD2980ABM33TR, LD2980CM33TR

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status	Inventory
LP2981IM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	12,302
LP2981-33DBVR	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	69,150
LP2981-33DBVT	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	4,490
LP2981A-33DBVR	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	56,100
LP2981A-33DBVT	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	1,900
LP2981A-33DBVTG4	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Discontinued at DiGi Electronics	23,637
LP2981AIM5-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	4,948
LP2981AIM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	7,272
LP2981IM5-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	18,400
LD2980ABM33TR	STMicroelectronics	3.3V	50mA	16V	0.225V @ 50mA	150 µA	SOT-23-5	Active	29,400
LD2980CM33TR	STMicroelectronics	3.3V	50mA	16V	0.225V @ 50mA	150 µA	SOT-23-5	Active	26,100

Engineering Selection Recommendations

For Direct Substitution (100mA Output Current Requirement)

Select from the Texas Instruments LP2981 series parametric equivalents when the application requires 100mA output current. LP2981-33DBVR and LP2981A-33DBVR are both Active status parts with substantial inventory availability (69,150 and 56,100 units respectively). These maintain all electrical specifications identical to the LP2981IM5X-3.3/NOPB. Parts designated as Last Time Buy (LP2981-33DBVT, LP2981A-33DBVT) remain functionally equivalent but represent end-of-life inventory.

For Current-Limited Applications (50mA Output Current)

The STMicroelectronics LD2980 series (LD2980ABM33TR, LD2980CM33TR) provides alternative sourcing when application requirements permit reduced output current to 50mA. Both variants are Active status with high inventory levels (29,400 and 26,100 units). These parts deliver lower dropout voltage (0.225V @ 50mA) and maintain SOT-23-5 package compatibility. Quiescent current is higher at 150 µA.

Compliance and Certification

All listed parts maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH Unaffected status. ECCN classification is EAR99 for all variants.

Frequently Asked Questions (FAQ)

Q: Can LP2981-33DBVR replace LP2981IM5X-3.3/NOPB directly?

A: Yes. Both parts deliver identical electrical specifications: 3.3V fixed output, 100mA output current, 0.37V maximum dropout voltage at 100mA, and 95 µA quiescent current. The difference is packaging format (Cut Tape & Digi-Reel versus Cut Tape & Digi-Reel). Both use SOT-23-5 package and operate across -40°C to 125°C.

Q: What is the difference between LP2981A and LP2981 variants?

A: The provided specifications show identical electrical parameters for both LP2981 and LP2981A series variants. Differences are limited to packaging format designations and product status (Active versus Last Time Buy).

Q: Can LD2980 series parts substitute for LP2981 in all applications?

A: LD2980 series parts are suitable only when application requirements permit 50mA maximum output current. The LP2981 series delivers 100mA. If your circuit requires the full 100mA output current, LD2980 parts are not appropriate substitutes. Both maintain identical 3.3V output voltage, 16V maximum input voltage, and SOT-23-5 package compatibility.

Q: What does "Last Time Buy" product status mean?

A: Last Time Buy indicates the manufacturer has announced end-of-life for that specific part number. Existing inventory is available for purchase, but no future production is planned. For long-term designs, select Active status parts such as LP2981-33DBVR or LP2981A-33DBVR.

Q: Are all these parts RoHS compliant?

A: Yes. All listed parts maintain ROHS3 compliance and are REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the "X" in LP2981AIM5X-3.3/NOPB?

A: The "X" designation indicates an extended temperature or specification variant within the LP2981AIM5 product line. Electrical specifications remain identical to LP2981AIM5-3.3/NOPB (without the X). Both are Active status parts suitable for direct substitution.

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