LP2981-28DBVTE4 Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVTE4 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.8V output at 100mA in a SOT-23-5 surface mount package. This device is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	2.8V
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 for the LP2981-28DBVTE4 is determined by the following critical parameters: fixed output voltage of 2.8V, SOT-23-5 package compatibility, positive output configuration, enable control feature, and operating temperature range of -40°C to 125°C. Substitute parts must maintain these core electrical and mechanical specifications to ensure direct replacement capability.

Parametric equivalents from Texas Instruments (LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, LP2981A-28DBVT) share identical electrical characteristics and package specifications. Manufacturer-recommended alternatives from Microchip Technology (MIC5203-2.8YM5-TR and MIC5205-2.8YM5-TR) provide functional equivalence with variations in output current rating and quiescent current specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory
LP2981-28DBVTE4	Texas Instruments	2.8V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	832 Pcs
LP2981-28DBVR	Texas Instruments	2.8V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	6190 Pcs
LP2981-28DBVT	Texas Instruments	2.8V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	4374 Pcs
LP2981A-28DBVR	Texas Instruments	2.8V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	4400 Pcs
LP2981A-28DBVT	Texas Instruments	2.8V	100mA	0.37V @ 100mA	95 µA	SOT-23-5	Active	4266 Pcs
MIC5203-2.8YM5-TR	Microchip Technology	2.8V	80mA	0.6V @ 80mA	750 µA	SOT-23-5	Active	5770 Pcs
MIC5205-2.8YM5-TR	Microchip Technology	2.8V	150mA	0.35V @ 150mA	150 µA	SOT-23-5	Active	55200 Pcs

Engineering Selection Recommendations

For direct replacement with identical electrical performance, select LP2981A-28DBVT, which maintains all core specifications of the LP2981-28DBVTE4 while offering Active product status and superior long-term availability. This part is ROHS3 compliant and carries the same operating temperature range and protection features.

LP2981-28DBVR and LP2981-28DBVT provide parametric equivalence but carry Obsolete status, limiting their suitability for new designs despite higher current inventory levels. LP2981A-28DBVR offers Last Time Buy status, suitable only for legacy production support.

MIC5203-2.8YM5-TR from Microchip Technology provides functional equivalence with reduced output current (80mA versus 100mA) and elevated quiescent current (750 µA versus 95 µA). This part is appropriate only for applications where the lower current rating is acceptable.

MIC5205-2.8YM5-TR offers increased output current capability (150mA) with improved dropout voltage performance (0.35V @ 150mA) and lower quiescent current (150 µA). This part is suitable for applications requiring higher current delivery or enhanced efficiency characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT directly replace LP2981-28DBVTE4?

A: Yes. Both parts share identical electrical specifications: 2.8V fixed output, 100mA output current, 0.37V dropout voltage at 100mA, 95 µA quiescent current, and SOT-23-5 package. The primary difference is product status; LP2981A-28DBVT is Active while the original is Obsolete.

Q: What is the difference between LP2981-28DBVR and LP2981-28DBVT?

A: Both parts are electrically identical. The difference lies in packaging format: DBVR indicates Cut Tape (CT) & Digi-Reel packaging, while DBVT indicates Tape & Reel (TR) packaging. Selection depends on procurement and assembly requirements.

Q: Can MIC5203-2.8YM5-TR be used as a direct substitute?

A: MIC5203-2.8YM5-TR is not a direct substitute. While it maintains 2.8V output and SOT-23-5 package compatibility, it delivers only 80mA output current (versus 100mA) and exhibits higher quiescent current (750 µA versus 95 µA). Use only if your application requires less than 80mA output current.

Q: When should MIC5205-2.8YM5-TR be selected?

A: MIC5205-2.8YM5-TR is appropriate for applications requiring output current exceeding 100mA, up to 150mA. It also provides superior dropout voltage performance (0.35V @ 150mA) and lower quiescent current (150 µA), making it suitable for efficiency-critical designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and are REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging options are available?

A: All parts use SOT-23-5 (SC-74A) surface mount package. Packaging format varies: DBVR indicates Cut Tape & Digi-Reel, DBVT indicates Tape & Reel, and DBVTE4 indicates the original format. Consult your assembly process requirements for appropriate selection.

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