LP2981A-30DBVR Equivalent & Substitute Parts

Part Overview

The LP2981A-30DBVR is a linear voltage regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3V output at 100mA with a maximum dropout voltage of 0.37V at full load current. The part is housed in a SOT-23-5 surface mount package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

The LP2981A-30DBVR is currently Active in product status. Identifying equivalent and substitute parts is necessary for design flexibility, supply chain continuity, and component availability across different procurement channels and manufacturing batches.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3V	V
Output Current	100mA	mA
Input Voltage (Maximum)	16V	V
Dropout Voltage @ 100mA	0.37V	V
Quiescent Current	95 µA	µA
PSRR @ 1kHz	63dB	dB
Operating Temperature Range	-40°C to 125°C	°C
Package Type	SOT-23-5 (SC-74A)	-
Mounting Type	Surface Mount	-
Protection Features	Over Current, Over Temperature, Short Circuit	-
Control Features	Enable	-
RoHS Status	ROHS3 Compliant	-
MSL Rating	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the LP2981A-30DBVR are classified based on strict parametric equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Output voltage: 3V fixed
Output current capability: 100mA minimum
Input voltage range: 16V maximum
Package type: SOT-23-5 (SC-74A)
Surface mount configuration
Operating temperature range: -40°C to 125°C
Protection features: Over-current and over-temperature protection

Substitution Categories:

Category 1: Parametric Equivalents (Texas Instruments LP2981 Series) These parts share identical electrical specifications and packaging with the main part. Differences exist only in packaging format (Cut Tape vs. Tape & Reel) or product status.

Category 2: Parametric Equivalents (Alternative Manufacturers) Parts from National Semiconductor and STMicroelectronics that meet all critical electrical and mechanical parameters.

Category 3: Functional Alternatives with Higher Current Rating The MIC5225-3.0YM5-TR offers 150mA output current, exceeding the 100mA requirement, while maintaining all other critical parameters.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Load	Iq	Package	Status
LP2981A-30DBVR	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active
LP2981-30DBVR	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active
LP2981-30DBVT	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active
LP2981A-30DBVRG4	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Discontinued at DiGi Electronics
LP2981A-30DBVT	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete
LP2981A-30DBVTG4	Texas Instruments	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Discontinued at DiGi Electronics
LP2981IM5X-3.0/NOPB	National Semiconductor	3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active
LD2981ABM30TR	STMicroelectronics	3V	100mA	16V	0.375V @ 100mA	150 µA	SOT-23-5	Active
MIC5225-3.0YM5-TR	Microchip Technology	3V	150mA	16V	0.45V @ 150mA	Not specified	SOT-23-5	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

LP2981-30DBVR and LP2981-30DBVT are the preferred direct substitutes. Both are manufactured by Texas Instruments with Active product status and identical electrical specifications to the LP2981A-30DBVR. The difference between these parts is packaging format: LP2981-30DBVR is supplied in Cut Tape format, while LP2981-30DBVT is supplied in Tape & Reel format. Selection between these should be based on procurement and assembly requirements.

Secondary Substitutes (Parametric Equivalents):

LP2981IM5X-3.0/NOPB from National Semiconductor is a parametric equivalent with Active status. This part meets all critical electrical and mechanical specifications and is suitable for direct substitution where manufacturer flexibility is acceptable.

LD2981ABM30TR from STMicroelectronics is an Active product that meets all critical parameters. The quiescent current is higher at 150 µA compared to 95 µA in the main part, and dropout voltage is marginally higher at 0.375V. These differences are within acceptable tolerances for most applications requiring 3V regulation at 100mA.

Higher Current Alternative:

MIC5225-3.0YM5-TR from Microchip Technology provides 150mA output current capability, exceeding the 100mA specification of the main part. This part is suitable for applications requiring higher current delivery while maintaining 3V output regulation. The dropout voltage at 150mA is 0.45V, which is higher than the main part's 0.37V at 100mA. This part is Active and ROHS3 compliant.

Obsolete and Discontinued Parts:

LP2981A-30DBVRG4, LP2981A-30DBVT, and LP2981A-30DBVTG4 are not recommended for new designs. LP2981A-30DBVT is marked Obsolete, while LP2981A-30DBVRG4 and LP2981A-30DBVTG4 are Discontinued at DiGi Electronics. These parts should be used only for legacy system maintenance or repair where no alternative is available.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant and carry MSL rating of 1 (Unlimited), matching the environmental and handling requirements of the main part. All parts operate across the -40°C to 125°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP2981-30DBVR be used as a direct replacement for LP2981A-30DBVR?

A: Yes. LP2981-30DBVR is a direct parametric equivalent with identical electrical specifications, output voltage, current rating, and package type. The primary difference is packaging format (Cut Tape vs. the original part's Tape & Reel format). Electrical performance and PCB footprint are identical.

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

A: Both parts are parametric equivalents with identical electrical specifications. The difference is in packaging format: DBVT indicates Tape & Reel packaging, while DBVR indicates Cut Tape packaging. Selection depends on assembly line requirements and procurement preferences.

Q: Can LD2981ABM30TR from STMicroelectronics replace the LP2981A-30DBVR?

A: Yes, with minor parameter variations. The LD2981ABM30TR meets all critical specifications: 3V output, 100mA current, 16V input maximum, SOT-23-5 package, and -40°C to 125°C operating range. The quiescent current is higher at 150 µA versus 95 µA, and dropout voltage is 0.375V versus 0.37V. These differences are acceptable for most applications.

Q: Is MIC5225-3.0YM5-TR suitable as a substitute?

A: MIC5225-3.0YM5-TR is suitable for applications where higher output current is beneficial or required. This part delivers 150mA versus the 100mA of the main part, while maintaining 3V output and SOT-23-5 packaging. The dropout voltage at 150mA is 0.45V, higher than the main part's 0.37V at 100mA. Use this part only if the higher current capability is needed or if the higher dropout voltage is acceptable for the application.

Q: Can I use LP2981A-30DBVT in a new design?

A: No. LP2981A-30DBVT is marked Obsolete and should not be used in new designs. Use LP2981-30DBVT or LP2981-30DBVR instead, which are Active products with identical specifications.

Q: What are the key parameters that determine substitutability?

A: The critical parameters are: fixed 3V output voltage, 100mA minimum output current, 16V maximum input voltage, SOT-23-5 package type, surface mount configuration, -40°C to 125°C operating temperature range, and integrated over-current and over-temperature protection. Parts meeting all these parameters are considered direct substitutes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance of the main part LP2981A-30DBVR.

Q: What is the MSL rating for these parts?

A: All substitute parts carry MSL rating of 1 (Unlimited), indicating unlimited shelf life and no moisture sensitivity restrictions during storage and handling.

Q: Can I mix different manufacturers' parts in the same production batch?

A: Yes. All recommended substitute parts are parametrically equivalent and functionally interchangeable. However, design validation and testing should confirm performance in your specific application circuit before production implementation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message