LP2981IM5-3.3 Equivalent & Substitute Parts

Part Overview

The LP2981IM5-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 100mA in SOT-23-5 surface mount packaging. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2981IM5-3.3
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
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
Supplier Device Package	SOT-23-5
Operating Temperature Range	-40°C ~ 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

Substitution for the LP2981IM5-3.3 is determined by the following critical parameters:

Output voltage fixed at 3.3V
Output current capability of 100mA
Maximum input voltage of 16V
Dropout voltage specification of 0.37V @ 100mA
SOT-23-5 package configuration
Positive fixed output configuration
Enable control feature
Over current, over temperature, and short circuit protection

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitute: LP2980IM5-3.3/NOPB differs in output current (50mA vs 100mA) and dropout voltage (0.22V @ 50mA vs 0.37V @ 100mA). This part is suitable only for applications requiring lower current delivery.

Parametric Equivalents: LP2981-33DBVR, LP2981-33DBVT, LP2981A-33DBVR, LP2981A-33DBVT, LP2981A-33DBVTG4, LP2981AIM5-3.3/NOPB, LP2981AIM5X-3.3/NOPB, and LP2981IM5-3.3/NOPB maintain identical electrical specifications (100mA output, 0.37V dropout, 3.3V fixed output) and differ only in packaging format (Cut Tape, Tape & Reel, or Digi-Reel) and product status.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage (Max)	Input Voltage (Max)	Quiescent Current	Package	Product Status	Inventory
LP2981IM5-3.3	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Last Time Buy	1210 Pcs
LP2980IM5-3.3/NOPB	Texas Instruments	3.3V	50mA	0.22V @ 50mA	16V	95 µA	SOT-23-5	Active	16200 Pcs
LP2981-33DBVR	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	69150 Pcs
LP2981-33DBVT	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Last Time Buy	4490 Pcs
LP2981A-33DBVR	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	56100 Pcs
LP2981A-33DBVT	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Last Time Buy	1900 Pcs
LP2981A-33DBVTG4	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Discontinued at DiGi Electronics	23637 Pcs
LP2981AIM5-3.3/NOPB	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	4948 Pcs
LP2981AIM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	7272 Pcs
LP2981IM5-3.3/NOPB	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	18400 Pcs
LP2981IM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	0.37V @ 100mA	16V	95 µA	SOT-23-5	Active	12302 Pcs

Engineering Selection Recommendations

For applications requiring exact electrical performance matching, select from the parametric equivalent parts with Active product status: LP2981-33DBVR, LP2981A-33DBVR, LP2981AIM5-3.3/NOPB, LP2981AIM5X-3.3/NOPB, or LP2981IM5-3.3/NOPB. These parts maintain 100mA output current and 0.37V dropout voltage specifications identical to the LP2981IM5-3.3.

LP2981IM5-3.3/NOPB offers the highest inventory availability (18400 Pcs) among Active status equivalents and is recommended as the primary substitute for new designs and production continuity.

LP2981-33DBVR provides the largest inventory stock (69150 Pcs) and Active product status, making it suitable for high-volume applications.

LP2980IM5-3.3/NOPB is suitable only for applications where output current requirements do not exceed 50mA. This part is not recommended as a direct substitute for designs requiring full 100mA capability.

All substitute parts maintain ROHS3 compliance, identical operating temperature range (-40°C ~ 125°C), and equivalent protection features (over current, over temperature, short circuit).

Frequently Asked Questions (FAQ)

Q: Can LP2980IM5-3.3/NOPB replace LP2981IM5-3.3 in all applications?

A: No. LP2980IM5-3.3/NOPB is rated for 50mA maximum output current compared to 100mA for LP2981IM5-3.3. Use LP2980IM5-3.3/NOPB only in applications where load current does not exceed 50mA. For designs requiring 100mA output, select parametric equivalent parts from the LP2981 series.

Q: What is the difference between LP2981IM5-3.3 and LP2981IM5-3.3/NOPB?

A: Both parts are electrically identical with 100mA output, 3.3V fixed output, and 0.37V dropout voltage. The primary difference is packaging format and availability. LP2981IM5-3.3/NOPB is available in Cut Tape and Digi-Reel formats with higher inventory (18400 Pcs vs 1210 Pcs).

Q: Are all LP2981 variants pin-compatible?

A: Yes. All LP2981 and LP2981A variants use SOT-23-5 packaging (SC-74A, SOT-753) with identical pinout and electrical specifications for 100mA output at 3.3V.

Q: Which substitute part has the best long-term availability?

A: LP2981-33DBVR maintains Active product status with the largest inventory (69150 Pcs), providing the best long-term availability for production requirements.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical moisture sensitivity level (MSL 1 - Unlimited).

Q: Can I use LP2981A variants as direct replacements for LP2981 variants?

A: Yes. LP2981A variants maintain identical electrical specifications (100mA output, 0.37V dropout, 3.3V fixed output) and SOT-23-5 packaging. The "A" designation indicates a product revision but does not affect functional compatibility.

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