LP2981AIM5-4.0 Equivalent & Substitute Parts

Part Overview

The LP2981AIM5-4.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 100mA output current with a fixed 4V output and operates across an input voltage range up to 16V. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

LP2981AIM5-4.0

Texas InstrumentsIn Stock: 1224LP2981AIM5-4.0 Datasheet

Current PartRFQ

LP2985AIM5-4.0/NOPB

Texas InstrumentsIn Stock: 1689LP2985AIM5-4.0/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2981AIM5-4.0 is determined by the following critical parameters:

• Package Compatibility: SOT-23-5 (SC-74A, SOT-753) surface mount package
• Output Voltage: Fixed 4V output
• Input Voltage Range: Maximum 16V
• Output Current Capability: Minimum 100mA required
• Control Features: Enable function
• Protection Features: Over Current, Over Temperature, Short Circuit protection
• Operating Temperature Range: -40°C ~ 125°C
• Compliance: ROHS3 Compliant

The LP2985AIM5-4.0/NOPB qualifies as a direct substitute based on matching all critical parameters while offering enhanced specifications in output current capacity.

Parameter Comparison

Engineering Selection Recommendations

The LP2985AIM5-4.0/NOPB is the qualified substitute for the obsolete LP2981AIM5-4.0. Both devices share identical package geometry, output voltage specification, input voltage rating, and protection architecture. The LP2985AIM5-4.0/NOPB maintains active product status with Texas Instruments, ensuring long-term availability and supply chain continuity.

The substitute part delivers 150mA output current compared to the original 100mA specification, providing additional current headroom for applications. Both parts maintain ROHS3 compliance and identical operating temperature ranges. The LP2985AIM5-4.0/NOPB is available in Cut Tape and Digi-Reel packaging formats, supporting both prototype and production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the LP2985AIM5-4.0/NOPB directly replace the LP2981AIM5-4.0 in existing designs?

A: Yes. Both devices use identical SOT-23-5 packaging, share the same 4V fixed output voltage, and support the same 16V maximum input voltage. Pin configuration and control features are compatible.

Q: What is the primary difference between these two parts?

A: The LP2985AIM5-4.0/NOPB provides 150mA output current capacity versus the LP2981AIM5-4.0's 100mA rating. The substitute part also maintains active product status, ensuring ongoing availability.

Q: Are there any electrical parameter differences that affect circuit design?

A: The voltage dropout specification differs: 0.37V @ 100mA for the original versus 0.58V @ 150mA for the substitute. Both parts maintain identical quiescent current (95 µA) and protection features. Applications requiring the original 100mA specification will operate within the substitute's rated capacity.

Q: What packaging options are available for the substitute part?

A: The LP2985AIM5-4.0/NOPB is supplied in Cut Tape (CT) and Digi-Reel formats, supporting both prototype development and high-volume production workflows.

Q: Are both parts RoHS compliant?

A: Yes. Both the LP2981AIM5-4.0 and LP2985AIM5-4.0/NOPB are ROHS3 compliant and REACH unaffected.