LP2981A-30DBVT Equivalent & Substitute Parts

Part Overview

The LP2981A-30DBVT is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3V output at 100mA with a maximum dropout voltage of 0.37V at full load current. The device integrates over-current, over-temperature, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C in a surface-mount SOT-23-5 package.

The LP2981A-30DBVT is marked as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

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 to 125°C
Package	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP2981A-30DBVT are classified based on the following criteria:

Primary Substitution Criteria:

Fixed output voltage of 3V
Output current capability of 100mA
Maximum input voltage of 16V
Dropout voltage specification of 0.37V @ 100mA
Quiescent current of 95 µA
PSRR of 63dB (1kHz)
Operating temperature range of -40°C to 125°C
SOT-23-5 package configuration
Enable control feature
Over-current, over-temperature, and short-circuit protection

Grouping Categories:

Category 1: Direct Parametric Equivalents (Texas Instruments) Parts meeting all electrical and mechanical specifications with identical performance characteristics. These include packaging variants (Tape & Reel vs. Cut Tape) and product status variations.

Category 2: Manufacturer-Recommended Alternatives (Texas Instruments & National Semiconductor) Parts recommended by manufacturers as functional replacements, maintaining identical electrical performance and package compatibility.

Category 3: Parametric Equivalents with Minor Variations (STMicroelectronics) Parts meeting core electrical specifications with allowable variations in quiescent current and supply current specifications while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	PSRR	Package	Product Status
LP2981A-30DBVT	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Obsolete
LP2981A-30DBVR	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active
LP2981IM5X-3.0/NOPB	National Semiconductor	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active
LP2981-30DBVR	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active
LP2981-30DBVT	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active
LP2981A-30DBVRG4	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Discontinued at DiGi Electronics
LP2981A-30DBVTG4	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Discontinued at DiGi Electronics
LP2981AIM5-3.0/NOPB	Texas Instruments	3V	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Obsolete
LD2981ABM30TR	STMicroelectronics	3V	100mA	0.375V @ 100mA	150 µA	63dB (1kHz)	SOT-23-5	Active
LD2981CM30TR	STMicroelectronics	3V	100mA	0.375V @ 100mA	150 µA	63dB (1kHz)	SOT-23-5	Active
LD2980ABM30TR	STMicroelectronics	3V	50mA	0.225V @ 50mA	150 µA	63dB (1kHz)	SOT-23-5	Active

Engineering Selection Recommendations

Preferred Substitutes (Active Product Status):

LP2981A-30DBVR and LP2981-30DBVR from Texas Instruments are the primary recommended substitutes. Both maintain identical electrical specifications to the obsolete LP2981A-30DBVT, with the distinction being packaging format: LP2981A-30DBVR is supplied in Cut Tape & Digi-Reel format, while LP2981-30DBVT is supplied in Tape & Reel format. Both are ROHS3 compliant and carry REACH Unaffected status.

LP2981IM5X-3.0/NOPB from National Semiconductor provides an alternative from a different manufacturer while maintaining identical electrical performance and package compatibility. This part is currently active in production.

Secondary Substitutes (Active Product Status with Parameter Variations):

LD2981ABM30TR and LD2981CM30TR from STMicroelectronics are functionally compatible alternatives. These parts exhibit slightly higher quiescent current (150 µA versus 95 µA) and marginally higher dropout voltage (0.375V versus 0.37V @ 100mA). Both maintain the 100mA output current capability, 3V fixed output, and SOT-23-5 package. Both are ROHS3 compliant and REACH Unaffected.

Limited Current Substitutes (Output Current Limitation):

LD2980ABM30TR from STMicroelectronics is suitable only for applications requiring 50mA or less output current. This part is not recommended as a direct substitute for designs requiring the full 100mA output capability of the LP2981A-30DBVT.

Discontinued Parts (Not Recommended for New Designs):

LP2981A-30DBVRG4 and LP2981A-30DBVTG4 are discontinued at DiGi Electronics and should not be selected for new designs or ongoing production requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-30DBVR directly replace LP2981A-30DBVT in existing designs?

A: Yes. LP2981A-30DBVR is a direct parametric equivalent with identical electrical specifications. The difference is packaging format: LP2981A-30DBVR is supplied in Cut Tape & Digi-Reel format while LP2981A-30DBVT is supplied in Tape & Reel format. Both use the SOT-23-5 package and are pin-compatible.

Q: What is the difference between LP2981-30DBVR and LP2981A-30DBVR?

A: Both parts are electrically identical with matching output voltage (3V), output current (100mA), dropout voltage (0.37V @ 100mA), and quiescent current (95 µA). The primary difference is the product designation variant. Both are active products from Texas Instruments and suitable for direct substitution.

Q: Are STMicroelectronics LD2981 parts suitable replacements?

A: LD2981ABM30TR and LD2981CM30TR are functionally compatible with allowable parameter variations. Quiescent current is higher at 150 µA (versus 95 µA), and dropout voltage is marginally higher at 0.375V (versus 0.37V @ 100mA). Output current remains 100mA. These parts are suitable if the application can tolerate the increased quiescent current and slightly higher dropout voltage. Both maintain the SOT-23-5 package and 3V fixed output.

Q: Why is LD2980ABM30TR not recommended as a substitute?

A: LD2980ABM30TR has a maximum output current of 50mA, compared to the 100mA capability of LP2981A-30DBVT. This part is suitable only for applications with reduced current requirements and should not be used in designs requiring the full 100mA output current.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance and REACH Unaffected status, matching the regulatory compliance of the original LP2981A-30DBVT.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the industrial temperature range of -40°C to 125°C, identical to the original LP2981A-30DBVT.

Q: Can I use National Semiconductor LP2981IM5X-3.0/NOPB in place of the Texas Instruments part?

A: Yes. LP2981IM5X-3.0/NOPB from National Semiconductor is electrically identical to LP2981A-30DBVT with matching output voltage, current, dropout voltage, quiescent current, and PSRR specifications. The SOT-23-5 package ensures pin compatibility.

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