LM2831XMFX Equivalent & Substitute Parts

Part Overview

The LM2831XMFX is a buck switching regulator IC from Texas Instruments designed for step-down voltage conversion with positive adjustable output. It delivers 1.5A output current with an input voltage range of 3V to 5.5V and adjustable output from 0.6V to 4.5V. The device operates at a switching frequency of 1.6MHz and is housed in a SC-74A (SOT-753) surface mount package.

The LM2831XMFX is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

LM2831XMFX

Texas InstrumentsIn Stock: 3942LM2831XMFX Datasheet

Current PartRFQ

LM2831XMFX/NOPB

Texas InstrumentsIn Stock: 1110LM2831XMFX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2831XMFX is determined by strict equivalence across the following critical parameters:

• Function and topology (step-down buck converter)
• Output configuration (positive adjustable)
• Electrical specifications (input voltage range 3V–5.5V, output range 0.6V–4.5V, 1.5A output current)
• Switching frequency (1.6MHz)
• Package type (SC-74A, SOT-753, SOT-23-5)
• Operating temperature range (-40°C ~ 125°C)
• Absence of synchronous rectifier

The LM2831XMFX/NOPB is a direct equivalent part from Texas Instruments that maintains identical electrical and mechanical specifications while differing only in packaging configuration and product status.

Parameter Comparison

Engineering Selection Recommendations

The LM2831XMFX/NOPB is the direct equivalent substitute for the obsolete LM2831XMFX. Both parts are manufactured by Texas Instruments and share identical electrical and mechanical specifications across all critical parameters.

The primary distinction between these parts is product status and regulatory compliance. The LM2831XMFX is obsolete, while the LM2831XMFX/NOPB maintains active status. Additionally, the LM2831XMFX/NOPB is ROHS3 compliant, whereas the original part is RoHS non-compliant. The packaging configuration differs (Cut Tape & Digi-Reel versus standard packaging), but the physical package remains SC-74A, SOT-753.

For new designs or ongoing production requiring this regulator topology, the LM2831XMFX/NOPB is the appropriate selection due to its active product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the LM2831XMFX/NOPB be used as a direct replacement for the LM2831XMFX?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The LM2831XMFX/NOPB is the active equivalent with improved regulatory compliance.

Q: What is the difference between LM2831XMFX and LM2831XMFX/NOPB?

A: The primary differences are product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). Packaging configuration also differs, but the physical package type remains unchanged. Electrical and thermal specifications are identical.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. Both parts use the SC-74A (SOT-753) surface mount package with SOT-23-5 supplier device package designation. PCB footprints and mounting requirements are identical.

Q: What input and output voltage ranges does this regulator support?

A: The regulator accepts input voltage from 3V to 5.5V and provides adjustable output from 0.6V to 4.5V at up to 1.5A output current.

Q: Is the LM2831XMFX/NOPB suitable for applications requiring RoHS compliance?

A: Yes. The LM2831XMFX/NOPB is ROHS3 compliant, making it suitable for applications with RoHS requirements. The original LM2831XMFX is not RoHS compliant.