LP2981-50DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2981-50DBVRG4 is a linear voltage regulator IC from Texas Instruments, delivering positive fixed 5V output at 100mA in a SOT-23-5 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active inventory or alternative product statuses. The device provides integrated protection features including over-current, over-temperature, and short-circuit protection, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
PSRR	63dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-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 eligibility is determined by strict parameter matching across electrical and mechanical specifications. All substitute parts maintain identical output voltage (5V), output current (100mA), input voltage rating (16V maximum), dropout voltage (0.37V @ 100mA), quiescent current (95 µA), PSRR (63dB at 1kHz), operating temperature range (-40°C to 125°C), package type (SOT-23-5), and protection/control features. Substitutes are grouped by product status and packaging configuration. The primary distinction between parts lies in packaging format (Tape & Reel, Cut Tape, or Digi-Reel) and manufacturing lifecycle status (Active, Last Time Buy, Obsolete, or Discontinued).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Package	Product Status	Packaging Type
LP2981-50DBVRG4	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Discontinued	Tape & Reel (TR)
LP2981-50DBVR	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Cut Tape (CT) & Digi-Reel
LP2981IM5-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Cut Tape (CT) & Digi-Reel
LP2981-50DBVT	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Last Time Buy	Cut Tape (CT)
LP2981A-50DBVR	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Cut Tape (CT) & Digi-Reel
LP2981A-50DBVT	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Tape & Reel (TR)
LP2981AIM5-5.0	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Obsolete	Cut Tape (CT) & Digi-Reel
LP2981AIM5-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Cut Tape (CT) & Digi-Reel
LP2981AIM5X-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Cut Tape (CT) & Digi-Reel
LP2981IM5-5.0	National Semiconductor	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Not Specified
LP2981IM5X-5.0/NOPB	Texas Instruments	5V	100mA	16V	0.37V @ 100mA	95 µA	63dB (1kHz)	SOT-23-5	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For applications requiring immediate procurement with long-term supply assurance, LP2981-50DBVR, LP2981IM5-5.0/NOPB, LP2981A-50DBVR, LP2981AIM5-5.0/NOPB, LP2981AIM5X-5.0/NOPB, and LP2981IM5X-5.0/NOPB are all Active status parts from Texas Instruments with ROHS3 compliance and REACH unaffected status. LP2981-50DBVT remains available as Last Time Buy inventory with 1,000,300 units in stock, suitable for high-volume applications with defined end-of-life planning. LP2981AIM5-5.0 carries Obsolete status and should be avoided for new designs despite available inventory. LP2981IM5-5.0 from National Semiconductor is Active but lacks specified packaging and compliance documentation details. Packaging selection between Cut Tape & Digi-Reel and Tape & Reel formats depends on assembly line requirements and volume commitments.

Frequently Asked Questions (FAQ)

Q: Can LP2981-50DBVR directly replace LP2981-50DBVRG4?

A: Yes. Both parts share identical electrical specifications (5V output, 100mA current, 0.37V dropout, 95 µA quiescent current, 63dB PSRR) and package type (SOT-23-5). The difference is packaging format: LP2981-50DBVRG4 uses Tape & Reel while LP2981-50DBVR uses Cut Tape & Digi-Reel. LP2981-50DBVR is Active status with 17,200 units in stock.

Q: What is the difference between LP2981 and LP2981A variants?

A: Both LP2981 and LP2981A variants maintain identical electrical and mechanical parameters specified in this reference. Substitution between these variants is valid based on the provided parameter set. Consult device datasheets for any undocumented performance differences.

Q: Are National Semiconductor LP2981IM5-5.0 and Texas Instruments LP2981IM5-5.0/NOPB interchangeable?

A: Both parts meet the electrical and mechanical specifications in this reference. However, the National Semiconductor part lacks specified packaging format and complete compliance documentation. Texas Instruments LP2981IM5-5.0/NOPB is recommended for applications requiring documented ROHS3 compliance and REACH unaffected status.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. Parts with this designation are suitable for applications requiring lead-free components.

Q: Can I use LP2981-50DBVT for new production designs?

A: LP2981-50DBVT carries Last Time Buy status with high inventory (1,000,300 units). While electrically equivalent, this status indicates the manufacturer is discontinuing production. New designs should prioritize Active status parts such as LP2981-50DBVR or LP2981IM5-5.0/NOPB for long-term supply continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Texas Instruments parts in this list are ROHS3 compliant. LP2981IM5-5.0 from National Semiconductor does not specify RoHS status in the provided data. Verify compliance documentation for applications requiring certified RoHS compliance.

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