LM2647MTCX Equivalent & Substitute Parts

Part Overview

The LM2647MTCX is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 28-TSSOP package. This device functions as a transistor driver for step-down topology applications with dual output phases and integrated synchronous rectification. The LM2647MTCX is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

LM2647MTCX

Texas InstrumentsIn Stock: 2823LM2647MTCX Datasheet

Current PartRFQ

LM2647MTCX/NOPB

Texas InstrumentsIn Stock: 1622LM2647MTCX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2647MTCX is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck regulator with step-down DC-DC controller operation and transistor driver output
• Electrical Specifications: Dual output phases, 5.5V ~ 28V supply voltage range, 200kHz ~ 500kHz switching frequency, 75% maximum duty cycle
• Control Architecture: Integrated current limit, enable, frequency control, power good, and soft start functions
• Synchronous Rectification: Built-in synchronous rectifier capability
• Package Compatibility: 28-TSSOP surface mount package with identical pinout and thermal characteristics
• Operating Temperature: -5°C ~ 125°C junction temperature range

The LM2647MTCX/NOPB qualifies as a direct substitute based on identical electrical performance, control features, and package specifications. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM2647MTCX/NOPB is the direct active equivalent for the obsolete LM2647MTCX. Selection between these parts is determined by regulatory and supply chain requirements:

LM2647MTCX/NOPB is the preferred selection for new designs and production applications. This variant maintains identical electrical performance and package specifications while offering active product status and ROHS3 compliance certification. The Tape & Reel packaging format supports automated assembly processes standard in modern manufacturing environments.

LM2647MTCX remains available in limited inventory (2775 units) for legacy system support and repair applications where RoHS non-compliant components are acceptable. This variant is suitable only for non-regulated markets or systems with explicit exemptions from RoHS requirements.

Both parts share identical moisture sensitivity classification (MSL 3, 168 hours) and REACH unaffected status, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2647MTCX/NOPB directly replace LM2647MTCX in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM2647MTCX/NOPB provides the same buck regulator controller functionality, dual-phase output, switching frequency range, and control features. The primary differences are product status (active vs. obsolete) and RoHS compliance certification.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates lead-free, RoHS3 compliant packaging without plumbum (lead). This certification is required for applications subject to RoHS regulations in the European Union and equivalent markets.

Q: Are the package dimensions and pinout identical?

A: Yes. Both parts use the 28-TSSOP package with 0.173" width and 4.40mm body dimension. Pinout and thermal characteristics are identical, enabling direct PCB layout compatibility.

Q: What packaging format should be selected for production?

A: The LM2647MTCX/NOPB in Tape & Reel format is standard for automated pick-and-place assembly. Bulk packaging is typically reserved for manual assembly or low-volume prototyping.

Q: Are there any differences in operating temperature range?

A: No. Both variants operate across the identical -5°C to 125°C junction temperature range, ensuring equivalent thermal performance in all applications.

Q: What is the moisture sensitivity requirement for storage?

A: Both parts are classified as MSL 3 with a 168-hour floor life. Standard moisture-controlled storage conditions and handling procedures apply to both variants.