LM2642MTCX Equivalent & Substitute Parts

Part Overview

The LM2642MTCX is a synchronous step-down controller IC designed for embedded systems and console/set-top box applications. It operates across a 4.5V to 30V supply voltage range and is packaged in a 28-TSSOP form factor. The main part number is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM2642MTCX

Texas InstrumentsIn Stock: 4661LM2642MTCX Datasheet

Current PartRFQ

LM2642MTCX/NOPB

National SemiconductorIn Stock: 15447LM2642MTCX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2642MTCX is determined by strict alignment of the following electrical and mechanical parameters:

• Supply Voltage Range: 4.5V ~ 30V
• Supply Current: 1mA
• Operating Temperature Range: -40°C ~ 125°C
• Package Type: 28-TSSOP
• Mounting Configuration: Surface Mount
• Base Product Series: LM2642

The LM2642MTCX/NOPB qualifies as a direct substitute because it maintains identical electrical specifications, package geometry, and thermal operating range. Both parts share the same base product number (LM2642) and are designed for the same application domains (embedded systems, console/set-top boxes).

Parameter Comparison

Engineering Selection Recommendations

The LM2642MTCX/NOPB is the direct equivalent for the obsolete LM2642MTCX. Selection is based on:

• Product Status: The LM2642MTCX/NOPB maintains active product status, ensuring continued availability and manufacturing support, whereas the original part is obsolete.
• Electrical Equivalence: Both parts operate identically across the specified 4.5V to 30V supply range with 1mA supply current and -40°C to 125°C temperature range.
• Package Compatibility: Identical 28-TSSOP packaging ensures direct PCB footprint compatibility without layout modifications.
• Regulatory Compliance: Both parts share identical ECCN (EAR99) and HTSUS classifications, maintaining consistent export and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the LM2642MTCX/NOPB be used as a direct replacement for the LM2642MTCX?

A: Yes. Both parts share identical electrical specifications (4.5V–30V supply, 1mA supply current, -40°C to 125°C operating range), package geometry (28-TSSOP), and mounting type (surface mount). The primary difference is product status: the original is obsolete while the substitute is active.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix denotes "No Plumbum" (lead-free) packaging. This indicates compliance with lead-free manufacturing standards while maintaining electrical and mechanical compatibility with the base LM2642 design.

Q: Are there any PCB layout considerations when substituting the LM2642MTCX/NOPB?

A: No layout changes are required. Both parts use the identical 28-TSSOP package with 0.173" width and 4.40mm dimensions, ensuring direct footprint compatibility.

Q: What is the Moisture Sensitivity Level (MSL) for the substitute part?

A: The LM2642MTCX has an MSL rating of 3 (168 Hours). Confirm the MSL rating of the LM2642MTCX/NOPB with your supplier, as MSL specifications may vary by manufacturing lot and storage conditions.

Q: Are both parts RoHS compliant?

A: The original LM2642MTCX is listed as RoHS non-compliant. The LM2642MTCX/NOPB, indicated by the "/NOPB" suffix, is lead-free and typically RoHS compliant. Verify RoHS status with your component supplier for the specific lot.