LP2981IM5-3.0 Equivalent & Substitute Parts

Part Overview

The LP2981IM5-3.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3V output at 100mA in SOT-23-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design requirements. The LP2981IM5-3.0 provides micropower regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 3V output from input sources up to 16V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
PSRR	63dB (1kHz)
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP2981IM5-3.0 are grouped based on strict electrical and mechanical parameter equivalence. The primary substitution criteria are:

Fixed 3V output voltage
100mA output current capability
Maximum 16V input voltage rating
SOT-23-5 package compatibility
Dropout voltage performance at 100mA
Quiescent current specifications
Operating temperature range -40°C to 125°C
Enable control feature
Over-current and over-temperature protection

Parts meeting all these parameters are classified as parametric equivalents. The LD2980ABM30TR is identified as a manufacturer-recommended alternative with reduced output current (50mA) and represents a lower-capacity option for applications not requiring full 100mA output.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Product Status	RoHS Status	Packaging
LP2981IM5-3.0	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	Non-compliant	SOT-23-5
LP2981-30DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	ROHS3 Compliant	SOT-23-5
LP2981-30DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	ROHS3 Compliant	SOT-23-5
LP2981A-30DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	ROHS3 Compliant	SOT-23-5
LP2981A-30DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	ROHS3 Compliant	SOT-23-5
LP2981A-30DBVRG4	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Discontinued at DiGi Electronics	ROHS3 Compliant	SOT-23-5
LP2981A-30DBVTG4	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Discontinued at DiGi Electronics	ROHS3 Compliant	SOT-23-5
LP2981AIM5-3.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	ROHS3 Compliant	SOT-23-5
LP2981IM5X-3.0/NOPB	National Semiconductor	100mA	0.37V @ 100mA	95 µA	Active	Not specified	SOT-23-5
LD2981ABM30TR	STMicroelectronics	100mA	0.375V @ 100mA	150 µA	Active	ROHS3 Compliant	SOT-23-5
LD2980ABM30TR	STMicroelectronics	50mA	0.225V @ 50mA	150 µA	Active	ROHS3 Compliant	SOT-23-5

Engineering Selection Recommendations

For direct replacement of the obsolete LP2981IM5-3.0, select from active Texas Instruments parts LP2981-30DBVR or LP2981-30DBVT. Both maintain identical electrical specifications and ROHS3 compliance. LP2981-30DBVR is available in Cut Tape & Digi-Reel packaging with 5,000,300 pieces in stock. LP2981-30DBVT is available in Tape & Reel packaging with 17,603 pieces in stock.

The LP2981A series variants (LP2981A-30DBVR, LP2981A-30DBVT) provide equivalent performance with ROHS3 compliance and active product status where available. LP2981A-30DBVR is currently active with 4,267 pieces in stock.

The LP2981IM5X-3.0/NOPB from National Semiconductor (now part of Texas Instruments) offers active product status with identical electrical specifications and is available with 1,557 pieces in stock.

The LD2981ABM30TR from STMicroelectronics is an active parametric equivalent with identical 100mA output current and 3V fixed output. This part shows slightly higher quiescent current (150 µA vs 95 µA) and marginally higher dropout voltage (0.375V vs 0.37V), with 30,420 pieces in stock.

The LD2980ABM30TR from STMicroelectronics is a reduced-capacity alternative suitable only for applications requiring maximum 50mA output current. This part is not recommended as a direct substitute for 100mA applications.

Frequently Asked Questions (FAQ)

Q: Can LP2981-30DBVR and LP2981-30DBVT be used interchangeably with LP2981IM5-3.0?

A: Yes. Both parts are parametric equivalents with identical electrical specifications: 3V fixed output, 100mA output current, 0.37V dropout voltage at 100mA, 95 µA quiescent current, and SOT-23-5 packaging. The primary difference is packaging format: DBVR uses Cut Tape & Digi-Reel, while DBVT uses Tape & Reel. Both are ROHS3 compliant and active products.

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

A: Both LP2981 and LP2981A series maintain identical electrical performance for the 3V 100mA configuration. The "A" designation indicates a product revision. Both are available in equivalent packaging options and provide the same functional characteristics for substitution purposes.

Q: Is LD2981ABM30TR from STMicroelectronics a suitable replacement?

A: LD2981ABM30TR is a parametric equivalent meeting the core requirements of 3V output and 100mA current capacity. However, it exhibits higher quiescent current (150 µA vs 95 µA) and marginally higher dropout voltage (0.375V vs 0.37V). For applications sensitive to quiescent current or operating near maximum input-to-output voltage differential, the Texas Instruments LP2981 series is preferred.

Q: Why is LD2980ABM30TR not recommended as a direct substitute?

A: LD2980ABM30TR is rated for maximum 50mA output current, compared to the 100mA requirement of LP2981IM5-3.0. This part is suitable only for applications with reduced current requirements and should not be used in designs requiring full 100mA output capability.

Q: What packaging options are available for active substitutes?

A: Active Texas Instruments substitutes are available in two packaging formats: Cut Tape & Digi-Reel (DBVR variants) and Tape & Reel (DBVT variants). Both formats use SOT-23-5 package with identical pinout and electrical performance. Selection depends on assembly process requirements and procurement volume.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (LP2981-30DBVR, LP2981-30DBVT, LP2981A-30DBVR, LD2981ABM30TR) are ROHS3 compliant. The original LP2981IM5-3.0 is RoHS non-compliant. For applications requiring RoHS compliance, select from the active ROHS3-compliant alternatives.

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