LM5642MTCX Equivalent & Substitute Parts

Part Overview

The LM5642MTCX is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 28-TSSOP package. This power management IC functions as a transistor driver for step-down topology applications with dual output phases. The main part is currently in Last Time Buy status, making identification of active equivalent parts essential for ongoing design support and procurement planning.

Substiute Parts

LM5642MTCX

Texas InstrumentsIn Stock: 1746LM5642MTCX Datasheet

Current PartRFQ

LM5642MTCX/NOPB

Texas InstrumentsIn Stock: 42464LM5642MTCX/NOPB Datasheet

Parametric EquivalentRFQ

LM5642XMTX/NOPB

Texas InstrumentsIn Stock: 54151LM5642XMTX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM5642MTCX is determined by strict parameter matching across the following critical criteria:

Mandatory Matching Parameters:

• Package / Case: 28-TSSOP form factor
• Voltage - Supply (Vcc/Vdd): 4.5V ~ 36V range
• Topology: Buck configuration
• Number of Outputs: 2
• Output Phases: 2
• Output Configuration: Positive
• Synchronous Rectifier: Yes
• Clock Sync: Yes
• Control Features: Current Limit, Enable, Soft Start
• Operating Temperature: -40°C ~ 125°C (TJ)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 3 (168 Hours)

Allowable Variation Parameters:

• Frequency - Switching: 200kHz or 375kHz
• Packaging format: Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR)
• Product Status: Active or Last Time Buy

The identified substitute parts maintain full electrical and mechanical compatibility with the LM5642MTCX while offering different switching frequencies and packaging options.

Parameter Comparison

Engineering Selection Recommendations

LM5642MTCX/NOPB is the primary parametric equivalent. This part maintains identical electrical specifications and switching frequency (200kHz) to the main part while offering Active product status and significantly higher inventory availability (42418 units). The /NOPB suffix indicates lead-free plating, consistent with ROHS3 compliance requirements. Packaging remains available in Cut Tape (CT) & Digi-Reel® format.

LM5642XMTX/NOPB is a secondary equivalent suitable for applications where higher switching frequency (375kHz) is acceptable or beneficial. This variant operates at 375kHz instead of 200kHz while maintaining all other electrical and mechanical parameters. Active product status and highest inventory availability (54137 units) support long-term procurement. Packaging is supplied in Tape & Reel (TR) format.

Both substitute parts carry ROHS3 compliance and identical MSL ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can LM5642MTCX/NOPB be used as a direct replacement for LM5642MTCX?

A: Yes. LM5642MTCX/NOPB is a parametric equivalent with identical electrical specifications, package form factor, and operating characteristics. The primary difference is product status (Active vs. Last Time Buy) and higher inventory availability.

Q: What is the difference between LM5642MTCX/NOPB and LM5642XMTX/NOPB?

A: The switching frequency differs: LM5642MTCX/NOPB operates at 200kHz while LM5642XMTX/NOPB operates at 375kHz. All other electrical and mechanical parameters remain identical. Selection depends on application requirements for switching frequency, output ripple, and component sizing.

Q: Are the packaging formats interchangeable?

A: Both Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats contain the same die and electrical specifications. Format selection depends on assembly equipment compatibility and procurement volume requirements. The 28-TSSOP package dimensions remain constant across all variants.

Q: Do all variants meet the same compliance standards?

A: Yes. LM5642MTCX, LM5642MTCX/NOPB, and LM5642XMTX/NOPB are all ROHS3 compliant with MSL rating 3 (168 Hours). Moisture sensitivity handling and storage requirements are identical across all variants.

Q: Why is the main part marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number variant. Substitute parts with Active status (LM5642MTCX/NOPB and LM5642XMTX/NOPB) are recommended for new designs and ongoing procurement to ensure long-term availability.