LP2981-28DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVRG4 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 includes integrated protection features for over-current, over-temperature, 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
Voltage Dropout (Max)	0.37V @ 100mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2981-28DBVRG4 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 protection against over-current, over-temperature, and short-circuit conditions. All substitute parts must maintain these electrical and mechanical specifications to ensure direct functional replacement.

The substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2981 Series): LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, and LP2981A-28DBVT share identical electrical specifications with the main part, including 100mA output current, 0.37V maximum dropout voltage, and 95 µA quiescent current. These differ only in packaging format (Cut Tape vs. Tape & Reel) and product status.

Manufacturer Recommended Alternatives: MIC5203-2.8YM5-TR (Microchip Technology, 80mA output) and MIC5205-2.8YM5-TR (Microchip Technology, 150mA output) provide functional substitution with the same 2.8V output and SOT-23-5 package, but with different current ratings and electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	PSRR	Product Status	Packaging
LP2981-28DBVRG4	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	SOT-23-5
LP2981-28DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	SOT-23-5
LP2981-28DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	SOT-23-5
LP2981A-28DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Last Time Buy	SOT-23-5
LP2981A-28DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Active	SOT-23-5
MIC5203-2.8YM5-TR	Microchip Technology	80mA	0.6V @ 80mA	750 µA	Not Specified	Active	SOT-23-5
MIC5205-2.8YM5-TR	Microchip Technology	150mA	0.35V @ 150mA	150 µA	75dB (100Hz)	Active	SOT-23-5

Engineering Selection Recommendations

For direct replacement of the LP2981-28DBVRG4, the LP2981A-28DBVT is the preferred choice. This part maintains identical electrical specifications while offering Active product status, ensuring long-term availability and manufacturing support. The LP2981A-28DBVT is ROHS3 compliant and carries the same certifications as the original part.

The LP2981-28DBVR and LP2981-28DBVT remain viable alternatives with identical electrical performance, though both carry Obsolete status. The LP2981A-28DBVR is available as a Last Time Buy option.

For applications where higher output current is required, the MIC5205-2.8YM5-TR provides 150mA capability with superior dropout voltage performance (0.35V) and Active product status. This part is suitable for designs requiring increased current headroom while maintaining the 2.8V output and SOT-23-5 package.

The MIC5203-2.8YM5-TR is suitable only for applications with maximum current requirements of 80mA or less, as it provides reduced output current compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can LP2981A-28DBVT directly replace LP2981-28DBVRG4?

A: Yes. Both parts share identical electrical specifications: 2.8V fixed output, 100mA output current, 0.37V maximum dropout voltage, 95 µA quiescent current, and SOT-23-5 package. The primary difference is product status; LP2981A-28DBVT is Active while LP2981-28DBVRG4 is Obsolete.

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

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

Q: Can MIC5203-2.8YM5-TR replace LP2981-28DBVRG4?

A: MIC5203-2.8YM5-TR is suitable only for applications where output current does not exceed 80mA. The original part specifies 100mA output current. Additionally, MIC5203 exhibits higher quiescent current (750 µA vs. 95 µA) and higher dropout voltage (0.6V vs. 0.37V), which may impact power efficiency and thermal performance in current-limited designs.

Q: When should MIC5205-2.8YM5-TR be used instead of LP2981A-28DBVT?

A: MIC5205-2.8YM5-TR is appropriate for designs requiring output current up to 150mA. It offers superior dropout voltage (0.35V) and higher PSRR (75dB at 100Hz), making it suitable for noise-sensitive applications. Both parts maintain SOT-23-5 package compatibility and 2.8V fixed output.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, LP2981A-28DBVT, MIC5203-2.8YM5-TR, and MIC5205-2.8YM5-TR—are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: What is the impact of higher quiescent current in MIC5203?

A: The MIC5203-2.8YM5-TR draws 750 µA quiescent current compared to 95 µA in the LP2981 series. In battery-powered or low-power standby applications, this 7.9x increase in quiescent current may result in measurable power consumption during idle states and should be evaluated against application requirements.

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