LP2981-50DBVT Equivalent & Substitute Parts

Part Overview

The LP2981-50DBVT is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 5V output at 100mA in a SOT-23-5 surface mount package. This device provides micropower regulation with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2981-50DBVT
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
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)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LP2981-50DBVT are classified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Output voltage: 5V fixed
Output current capability: 100mA
Input voltage maximum: 16V
Dropout voltage: 0.37V @ 100mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit

Texas Instruments LP2981 Series (Direct Electrical Equivalents): Parts within the LP2981 family maintain identical electrical specifications and are interchangeable at the functional level. Variations exist in product status (Active vs. Obsolete) and packaging format (Cut Tape vs. Tape & Reel).

Cross-Manufacturer Alternative (STMicroelectronics LD2980): The LD2980ABM50TR operates at reduced output current (50mA vs. 100mA) and exhibits different quiescent current characteristics (150 µA vs. 95 µA). This part is suitable only for applications with lower current requirements and represents a functional downgrade in output capability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory (Pcs)
LP2981-50DBVT	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	1,000,300
LP2981IM5-5.0/NOPB	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	20,520
LP2981-50DBVR	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	17,200
LP2981A-50DBVR	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	9,400
LP2981A-50DBVT	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	3,400
LP2981AIM5-5.0	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	1,986
LP2981AIM5-5.0/NOPB	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	1,410
LP2981AIM5X-5.0/NOPB	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	6,500
LP2981IM5-5.0	National Semiconductor	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	11,000
LP2981IM5X-5.0/NOPB	Texas Instruments	5V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	6,640
LD2980ABM50TR	STMicroelectronics	5V	50mA	0.225V @ 50mA	150 µA	SOT-23-5	Active	18,360

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Recommended for New Designs):

LP2981IM5-5.0/NOPB and LP2981AIM5X-5.0/NOPB are the primary recommended substitutes. Both maintain identical electrical specifications to the LP2981-50DBVT, operate within the same temperature range, and carry Active product status with ROHS3 compliance. These parts provide the highest inventory availability and long-term supply assurance.

Tier 2 - Parametric Equivalents (Alternative Options):

LP2981-50DBVR, LP2981A-50DBVR, and LP2981A-50DBVT are parametrically equivalent with identical electrical performance. Selection among these variants depends on packaging format requirements (Cut Tape vs. Tape & Reel) and inventory availability. All maintain Active status and full compliance certifications.

Tier 3 - Reduced Capability Alternative:

LD2980ABM50TR from STMicroelectronics is suitable only for applications requiring maximum 50mA output current. This part exhibits higher quiescent current (150 µA vs. 95 µA) and lower dropout voltage at its reduced current rating. Use only when output current requirements do not exceed 50mA.

Obsolete Parts:

LP2981AIM5-5.0 carries Obsolete status and should not be selected for new designs despite electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP2981IM5-5.0/NOPB directly replace LP2981-50DBVT in existing designs?

A: Yes. Both parts maintain identical output voltage (5V), output current (100mA), dropout voltage (0.37V @ 100mA), quiescent current (95 µA), and operating temperature range (-40°C to 125°C). The SOT-23-5 package is mechanically identical. No circuit modifications are required.

Q: What is the difference between LP2981-50DBVR and LP2981-50DBVT?

A: Both parts are electrically identical. The suffix designates packaging format: DBVR indicates Cut Tape & Digi-Reel packaging, while DBVT indicates Tape & Reel packaging. Selection depends on procurement and assembly requirements.

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

A: LD2980ABM50TR is a functional alternative for applications with reduced current requirements (50mA maximum). It is not a direct replacement for 100mA designs. The higher quiescent current (150 µA) and different dropout voltage characteristics make it suitable only for specific low-current applications.

Q: Are all LP2981 variants ROHS3 compliant?

A: All Texas Instruments LP2981 variants listed carry ROHS3 compliance. The National Semiconductor LP2981IM5-5.0 does not specify RoHS status in the provided data.

Q: What inventory considerations should guide part selection?

A: LP2981IM5-5.0/NOPB offers the highest active inventory (20,520 pcs), followed by LP2981-50DBVR (17,200 pcs) and LD2980ABM50TR (18,360 pcs). For long-term supply assurance, prioritize parts with Active status and higher inventory levels.

Q: Can I use LP2981AIM5-5.0 for new production?

A: No. This part carries Obsolete status and should not be selected for new designs despite electrical equivalence to the LP2981-50DBVT.

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