LP2981A-29DBVT Equivalent & Substitute Parts

Part Overview

The LP2981A-29DBVT is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 2.9V output at 100mA in a SOT-23-5 surface mount package. The device is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system support, design updates, and procurement continuity. Obsolete status necessitates evaluation of active alternatives and parametrically equivalent options to maintain design functionality and supply chain reliability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.9V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LP2981A-29DBVT is determined by the following critical parameters: fixed output voltage of 2.9V, SOT-23-5 package compatibility, surface mount mounting type, and operating temperature range of -40°C to 125°C. All substitute parts must maintain these core specifications to ensure direct replacement capability.

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2981 Series): LP2981-29DBVR and LP2981A-29DBVR share identical electrical specifications with the main part, including 100mA output current, 0.37V dropout voltage, and 95 µA quiescent current. These differ only in packaging format (Tape & Reel or Cut Tape) and product status (both obsolete).

Manufacturer Recommended Alternative (Microchip MIC5205-2.9YM5-TR): This part maintains the 2.9V fixed output, SOT-23-5 package, and operating temperature range. It provides enhanced performance with 150mA output current capability, lower dropout voltage (0.35V @ 150mA), and active product status. The MIC5205 series is designated as a manufacturer-recommended substitute, offering superior specifications within the same package footprint.

Parameter Comparison

Parameter	LP2981A-29DBVT (Main)	LP2981-29DBVR	LP2981A-29DBVR	MIC5205-2.9YM5-TR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology
Output Voltage	2.9V	2.9V	2.9V	2.9V
Output Current	100mA	100mA	100mA	150mA
Input Voltage (Max)	16V	16V	16V	16V
Dropout Voltage (Max)	0.37V @ 100mA	0.37V @ 100mA	0.37V @ 100mA	0.35V @ 150mA
Quiescent Current	95 µA	95 µA	95 µA	150 µA
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Obsolete	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (Obsolete Inventory Continuation): LP2981-29DBVR and LP2981A-29DBVR provide identical electrical performance and are suitable for applications requiring exact specification matching. Both parts maintain ROHS3 compliance and REACH unaffected status. Selection between these two depends on packaging requirements: LP2981-29DBVR is supplied in Tape & Reel format, while LP2981A-29DBVR is available in Cut Tape and Digi-Reel format.

For New Designs and Long-Term Supply Assurance: MIC5205-2.9YM5-TR is the recommended alternative. This part is in active production status, ensuring long-term availability and supply chain stability. It maintains full compatibility with the SOT-23-5 package and operating temperature specifications. The enhanced 150mA output current capability provides design margin for applications approaching the 100mA limit. ROHS3 compliance and REACH unaffected status align with regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2981-29DBVR and LP2981A-29DBVR be used interchangeably with LP2981A-29DBVT?

A: Yes. All three parts share identical electrical specifications: 2.9V fixed output, 100mA output current, 0.37V dropout voltage, and SOT-23-5 package. Differences are limited to packaging format (Tape & Reel versus Cut Tape) and do not affect circuit performance or PCB layout.

Q: Is MIC5205-2.9YM5-TR a direct replacement?

A: MIC5205-2.9YM5-TR is functionally compatible within the same SOT-23-5 package and maintains the 2.9V output voltage and -40°C to 125°C operating range. The 150mA output current exceeds the original 100mA specification, providing additional design margin. Quiescent current is higher at 150 µA versus 95 µA. These differences are acceptable for most applications and do not require circuit redesign.

Q: Why is product status important for part selection?

A: LP2981A-29DBVT, LP2981-29DBVR, and LP2981A-29DBVR are all obsolete, meaning production has ended and future availability is limited to existing inventory. MIC5205-2.9YM5-TR is in active production, ensuring continued availability for new designs and long-term system support.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the significance of the SOT-23-5 package compatibility?

A: SOT-23-5 package compatibility ensures that substitute parts fit the same PCB footprint and land pattern without layout modifications. All listed parts use this identical package, enabling direct board-level substitution.

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