LP2981IM5-5.0 Equivalent & Substitute Parts

Part Overview

The LP2981IM5-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 5V output at 100mA with a maximum input voltage of 16V and dropout voltage of 0.37V at full load. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an operating temperature range of -40°C to 125°C. The part is currently in Last Time Buy status, indicating limited availability. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring this regulator specification.

Key Parameters

Parameter	Value
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)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2981IM5-5.0 are grouped based on strict electrical and mechanical parameter equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Fixed output voltage of 5V
Output current capability of 100mA
Maximum input voltage of 16V
SOT-23-5 package compatibility
Dropout voltage specification of 0.37V @ 100mA
Quiescent current of 95 µA
PSRR of 63dB (1kHz)
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range of -40°C to 125°C

Parametric Equivalent Parts maintain all electrical specifications and are functionally interchangeable. These include variants from Texas Instruments with different packaging options (Cut Tape vs. Tape & Reel) and product status designations. Packaging differences (CT vs. TR) do not affect electrical performance but may impact procurement and handling requirements.

Manufacturer Recommended Alternative (LD2980ABM50TR from STMicroelectronics) differs in output current capability (50mA vs. 100mA) and is not a direct substitute for applications requiring full 100mA output.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Product Status	Packaging
LP2981IM5-5.0	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Last Time Buy	CT & Digi-Reel®
LP2981-50DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	CT & Digi-Reel®
LP2981-50DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Last Time Buy	CT
LP2981A-50DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	CT & Digi-Reel®
LP2981A-50DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	TR
LP2981AIM5-5.0	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Obsolete	CT & Digi-Reel®
LP2981AIM5-5.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	CT & Digi-Reel®
LP2981AIM5X-5.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	CT & Digi-Reel®
LP2981IM5-5.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	CT & Digi-Reel®
LP2981IM5X-5.0/NOPB	Texas Instruments	100mA	0.37V @ 100mA	95 µA	Active	TR
LD2980ABM50TR	STMicroelectronics	50mA	0.225V @ 50mA	150 µA	Active	CT & Digi-Reel®

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

Parts LP2981-50DBVR, LP2981A-50DBVR, LP2981AIM5-5.0/NOPB, LP2981IM5-5.0/NOPB, and LP2981AIM5X-5.0/NOPB are direct electrical equivalents with identical output current (100mA), dropout voltage, and quiescent current specifications. Selection among these should prioritize product status and packaging requirements. Active status parts (LP2981-50DBVR, LP2981A-50DBVR, LP2981AIM5-5.0/NOPB, LP2981IM5-5.0/NOPB, LP2981AIM5X-5.0/NOPB) provide superior long-term availability compared to Last Time Buy or Obsolete designations.

Packaging Considerations:

Cut Tape (CT) and Digi-Reel® packaging variants are suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly. Selection depends on manufacturing process requirements rather than electrical performance.

Alternative from Different Manufacturer:

The LD2980ABM50TR from STMicroelectronics is not a direct substitute due to reduced output current capability (50mA vs. 100mA). This part is suitable only for applications with maximum current requirements of 50mA or less.

Compliance and Certification:

All listed parts maintain ROHS3 compliance, REACH unaffected status, and identical EAR99 and HTSUS classifications, ensuring regulatory consistency across substitutions.

Frequently Asked Questions (FAQ)

Q: Can LP2981-50DBVR replace LP2981IM5-5.0 in my design?

A: Yes. LP2981-50DBVR is a parametric equivalent with identical output voltage (5V), output current (100mA), dropout voltage (0.37V @ 100mA), and quiescent current (95 µA). The primary difference is product status (Active vs. Last Time Buy), which favors LP2981-50DBVR for new designs.

Q: What is the difference between LP2981AIM5-5.0 and LP2981AIM5-5.0/NOPB?

A: Both parts are electrically identical. The "/NOPB" suffix indicates lead-free plating (no lead on the leads). The NOPB variant is the current production version; the non-NOPB variant is obsolete.

Q: Can I use LD2980ABM50TR as a substitute?

A: LD2980ABM50TR is not a direct substitute. It provides only 50mA output current compared to the 100mA specification of LP2981IM5-5.0. Use this part only if your application requires maximum 50mA output.

Q: Does packaging type (CT vs. TR) affect electrical performance?

A: No. Cut Tape and Tape & Reel packaging contain identical die and electrical specifications. Packaging selection depends on assembly equipment and production volume requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of LP2981IM5-5.0.

Q: Which substitute part has the best long-term availability?

A: Parts with Active product status (LP2981-50DBVR, LP2981A-50DBVR, LP2981AIM5-5.0/NOPB, LP2981IM5-5.0/NOPB, LP2981AIM5X-5.0/NOPB) offer superior availability compared to Last Time Buy or Obsolete designations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message