LP2981AIM5-3.0 Equivalent & Substitute Parts

Part Overview

The LP2981AIM5-3.0 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 LP2981 series 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 LP2981AIM5-3.0 are classified based on strict parameter equivalence across the following critical specifications:

Primary Equivalence Criteria:

Output voltage: 3V fixed
Output current capability: 100mA
Maximum input voltage: 16V
Dropout voltage: 0.37V @ 100mA
Package type: SOT-23-5
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit

Grouping Categories:

Group 1: Direct Texas Instruments Equivalents (Packaging Variants) Parts LP2981-30DBVR, LP2981-30DBVT, LP2981A-30DBVR, LP2981A-30DBVT, LP2981A-30DBVRG4, and LP2981A-30DBVTG4 maintain identical electrical specifications with variations in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status. These represent the same die with different distribution packaging.

Group 2: Direct Manufacturer Equivalent (Packaging Variant) Part LP2981AIM5-3.0/NOPB is the direct equivalent with NOPB (No Plumbum/Lead-Free) designation and improved RoHS compliance status compared to the base part.

Group 3: National Semiconductor Equivalent Part LP2981IM5X-3.0/NOPB maintains identical electrical specifications and is functionally equivalent, representing the National Semiconductor variant of the same design.

Group 4: STMicroelectronics Alternatives Parts LD2981ABM30TR and LD2980ABM30TR from STMicroelectronics provide functional alternatives with minor parameter variations. LD2981ABM30TR matches 100mA output current; LD2980ABM30TR provides 50mA output current with reduced quiescent current (150 µA vs 95 µA).

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Product Status	RoHS Status	Packaging
LP2981AIM5-3.0	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	Non-compliant	SOT-23-5
LP2981AIM5-3.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	ROHS3 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
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

Preferred Substitutes (Active Product Status):

LP2981-30DBVR and LP2981-30DBVT are the primary recommended substitutes. Both are active products from Texas Instruments with ROHS3 compliance, identical electrical specifications to the original part, and superior availability. Selection between these two depends on packaging requirements: LP2981-30DBVR for Cut Tape & Digi-Reel applications, LP2981-30DBVT for Tape & Reel applications.

LP2981A-30DBVR maintains full electrical equivalence and active product status with ROHS3 compliance, offering an alternative within the LP2981A variant line.

Secondary Substitutes (Alternative Manufacturers):

LP2981IM5X-3.0/NOPB from National Semiconductor provides functional equivalence with active status. This option is suitable when Texas Instruments parts face supply constraints.

LD2981ABM30TR from STMicroelectronics maintains 100mA output current capability with ROHS3 compliance and active status. The quiescent current specification (150 µA vs 95 µA) represents a minor increase that may impact low-power applications. Dropout voltage remains within acceptable tolerance at 0.375V.

Not Recommended for Direct Substitution:

LD2980ABM30TR provides only 50mA output current, making it unsuitable for applications requiring the full 100mA specification of the original part.

Parts with discontinued or obsolete status (LP2981A-30DBVT, LP2981A-30DBVRG4, LP2981A-30DBVTG4) should be avoided for new designs despite electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP2981-30DBVR directly replace LP2981AIM5-3.0 in existing designs?

A: Yes. LP2981-30DBVR maintains identical electrical specifications including 3V output, 100mA current, 0.37V dropout voltage, and SOT-23-5 packaging. The primary difference is improved RoHS compliance status and active product availability.

Q: What is the difference between LP2981-30DBVR and LP2981-30DBVT?

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

Q: Can LD2981ABM30TR from STMicroelectronics be used as a substitute?

A: LD2981ABM30TR is functionally compatible with identical 100mA output current and 3V output voltage. The quiescent current is higher (150 µA vs 95 µA) and dropout voltage is marginally higher (0.375V vs 0.37V). These differences are acceptable for most applications but should be evaluated for power-critical designs.

Q: Why is LD2980ABM30TR not recommended?

A: LD2980ABM30TR provides only 50mA maximum output current compared to the 100mA requirement of LP2981AIM5-3.0. It is unsuitable for applications requiring full 100mA output capability.

Q: What does NOPB designation mean?

A: NOPB indicates "No Plumbum" (lead-free) packaging, signifying RoHS compliance. LP2981AIM5-3.0/NOPB is the lead-free variant of the original part with improved environmental compliance.

Q: Are there any thermal or performance differences between Texas Instruments and STMicroelectronics versions?

A: Both manufacturers' parts operate across the same temperature range (-40°C ~ 125°C) and provide identical PSRR (63dB at 1kHz). The STMicroelectronics LD2981ABM30TR has slightly higher quiescent current consumption, which may be relevant in ultra-low-power applications.

Q: Can I use LP2981A variants as substitutes?

A: LP2981A-30DBVR is an active product and fully equivalent. LP2981A-30DBVT, LP2981A-30DBVRG4, and LP2981A-30DBVTG4 have obsolete or discontinued status and should not be selected for new designs despite electrical equivalence.

Q: What is the minimum order quantity consideration for these substitutes?

A: LP2981-30DBVR has the highest inventory availability (5,000,300 pcs), followed by LD2981ABM30TR (30,420 pcs). All recommended active substitutes maintain adequate stock levels for production requirements.

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