LP2981-30DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2981-30DBVRG4 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 3V output at 100mA with a maximum dropout voltage of 0.37V, housed in a SOT-23-5 surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The LP2981-30DBVRG4 integrates enable control, over-current protection, over-temperature protection, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3V
Voltage - Input (Max)	16V
Current - Output	100mA
Voltage Dropout (Max)	0.37V @ 100mA
Current - Quiescent (Iq)	95 µA
PSRR	63dB (1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2981-30DBVRG4 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Output voltage: 3V fixed
Maximum output current: 100mA
Maximum input voltage: 16V
Dropout voltage: 0.37V @ 100mA
Quiescent current: 95 µA
PSRR: 63dB (1kHz)
Control features: Enable function
Protection: Over-current, over-temperature, short-circuit

Mechanical Parameters (Must Match):

Package type: SOT-23-5 (SC-74A, SOT-753)
Mounting type: Surface mount

Compliance Parameters:

RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are grouped into three categories: MFR Recommended (manufacturer-endorsed alternatives), Parametric Equivalents (identical electrical and mechanical specifications), and cross-manufacturer alternatives that meet all specified parameters.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	RoHS Status
LP2981-30DBVRG4	Texas Instruments	Obsolete	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981AIM5-3.0/NOPB	Texas Instruments	Obsolete	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981IM5X-3.0/NOPB	National Semiconductor	Active	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981-30DBVR	Texas Instruments	Active	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981-30DBVT	Texas Instruments	Active	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981A-30DBVR	Texas Instruments	Active	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981A-30DBVRG4	Texas Instruments	Discontinued at DiGi Electronics	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981A-30DBVT	Texas Instruments	Obsolete	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LP2981A-30DBVTG4	Texas Instruments	Discontinued at DiGi Electronics	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	ROHS3 Compliant
LD2981ABM30TR	STMicroelectronics	Active	3V	100mA	16V	0.375V @ 100mA	150 µA	SOT-23-5	ROHS3 Compliant
LD2981CM30TR	STMicroelectronics	Active	3V	100mA	16V	0.375V @ 100mA	150 µA	SOT-23-5	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status):

LP2981-30DBVR and LP2981-30DBVT are parametric equivalents from Texas Instruments with active product status. Both maintain identical electrical specifications and SOT-23-5 packaging. LP2981-30DBVT offers higher inventory availability (17,603 units) in Tape & Reel packaging, suitable for high-volume production. LP2981-30DBVR is available in Cut Tape & Digi-Reel format with substantial stock (5,000,300 units).

Secondary Substitutes (Active Status):

LP2981A-30DBVR represents an active variant with identical electrical performance and ROHS3 compliance. LP2981IM5X-3.0/NOPB from National Semiconductor is an active alternative maintaining all critical parameters.

Cross-Manufacturer Alternatives:

LD2981ABM30TR and LD2981CM30TR from STMicroelectronics are active alternatives with identical output voltage, current rating, and package type. These parts exhibit marginally higher quiescent current (150 µA versus 95 µA) and dropout voltage (0.375V versus 0.37V), remaining within acceptable tolerance for most applications. Both are ROHS3 compliant with MSL rating of 1.

Obsolete Variants:

LP2981A-30DBVT and LP2981AIM5-3.0/NOPB are obsolete but remain electrically equivalent. These should be considered only when active alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can LP2981-30DBVR directly replace LP2981-30DBVRG4?

A: Yes. LP2981-30DBVR is a parametric equivalent with identical electrical specifications (3V output, 100mA, 0.37V dropout), same SOT-23-5 package, and ROHS3 compliance. The primary difference is packaging format (Cut Tape & Digi-Reel versus the original format).

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

A: Both are parametric equivalents with identical electrical performance. The difference is packaging: LP2981-30DBVR uses Cut Tape & Digi-Reel format, while LP2981-30DBVT uses Tape & Reel format. Selection depends on production volume and handling requirements.

Q: Are STMicroelectronics LD2981 parts suitable replacements?

A: LD2981ABM30TR and LD2981CM30TR are functionally equivalent with the same 3V output, 100mA current, and SOT-23-5 package. Minor parameter variations exist: quiescent current is 150 µA (versus 95 µA) and dropout voltage is 0.375V (versus 0.37V). These differences are typically acceptable in most applications but should be verified against circuit requirements.

Q: Why is LP2981-30DBVRG4 listed as obsolete?

A: The part has reached end-of-life status at the manufacturer. Active alternatives with identical specifications are available, making substitution straightforward for new designs and production continuity.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the SOT-23-5 (SC-74A, SOT-753) surface mount package. Packaging format options include Cut Tape & Digi-Reel, Tape & Reel, and bulk formats, depending on the specific part number and supplier.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification with MSL rating of 1 (Unlimited), matching the original LP2981-30DBVRG4 specifications.

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