LM2743MTC Buck Regulator Controller Equivalent & Substitute Parts

Part Overview

The LM2743MTC is a buck regulator positive output step-down DC-DC controller IC in 14-TSSOP packaging manufactured by Texas Instruments. This power management IC functions as a transistor driver for step-down topology applications with a single output phase. The main part number LM2743MTC is currently in Last Time Buy status with 100,962 pieces in stock. Due to product lifecycle management, identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring buck regulation with the specified electrical and mechanical characteristics.

Substiute Parts

LM2743MTC

Texas InstrumentsIn Stock: 101004LM2743MTC Datasheet

Current PartRFQ

LM2743MTC/NOPB

Texas InstrumentsIn Stock: 1492LM2743MTC/NOPB Datasheet

DirectRFQ

LM2744MTC/NOPB

Texas InstrumentsIn Stock: 2243LM2744MTC/NOPB Datasheet

Parametric EquivalentRFQ

LM2747MTC/NOPB

Texas InstrumentsIn Stock: 1066LM2747MTC/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2743MTC are identified based on strict electrical and mechanical parameter matching within the Texas Instruments buck controller product family. The substitution logic is based on the following key parameters:

• Topology & Function: All substitutes maintain buck (step-down) topology with positive output configuration and single-phase, single-output architecture
• Electrical Specifications: Supply voltage range (3V ~ 6V), switching frequency capability (50kHz ~ 1MHz), and control feature set (Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking) must be identical
• Synchronous Rectifier: All substitutes include integrated synchronous rectifier functionality
• Package & Mounting: All substitutes use 14-TSSOP surface mount packaging with identical physical dimensions (0.173", 4.40mm Width)
• Operating Temperature: All substitutes support -40°C ~ 125°C (TJ) operating range
• Compliance: All substitutes maintain ROHS3 compliance and REACH Unaffected status

Substitutes are grouped into two categories: Direct Manufacturer Part (identical base product with packaging variation) and Parametric Equivalents (same topology and electrical class with minor parameter variations within acceptable design margins).

Parameter Comparison

Engineering Selection Recommendations

LM2743MTC/NOPB is the direct manufacturer equivalent with identical electrical and mechanical specifications. This part is in Active product status and available in Tube packaging. Selection of LM2743MTC/NOPB is appropriate for new designs and ongoing production where Active status and ROHS3 compliance with defined MSL rating are required.

LM2744MTC/NOPB is a parametric equivalent within the LM274x controller family, maintaining all core electrical specifications and control features. This part is in Active status and available in Bulk packaging. The MSL rating is Vendor Undefined; design teams must confirm moisture handling requirements for their specific assembly process.

LM2747MTC/NOPB is a parametric equivalent with maximum duty cycle of 86% compared to 80% for the main part. This higher duty cycle capability may provide design flexibility in applications requiring extended on-time. This part is in Active status, available in Tube packaging, and carries ROHS3 compliance with MSL 1 rating.

All three substitute parts maintain identical package geometry, operating temperature range, and control feature set. Selection between substitutes should be based on product lifecycle status (Active vs. Last Time Buy), packaging requirements (Tube vs. Bulk), and specific duty cycle requirements for the application.

Frequently Asked Questions (FAQ)

Q: Can LM2743MTC/NOPB be used as a direct replacement for LM2743MTC?

A: Yes. LM2743MTC/NOPB is the direct manufacturer equivalent with identical electrical specifications, control features, and 14-TSSOP package geometry. The primary difference is packaging format (Tube vs. unspecified) and Active product status versus Last Time Buy.

Q: What is the difference between LM2744MTC/NOPB and LM2747MTC/NOPB?

A: Both are parametric equivalents within the Texas Instruments buck controller family. The primary difference is maximum duty cycle: LM2744MTC/NOPB supports 80% duty cycle (matching the main part), while LM2747MTC/NOPB supports 86% duty cycle. Both maintain identical supply voltage range, switching frequency capability, and control features.

Q: Are all substitute parts pin-compatible with the original LM2743MTC?

A: All substitute parts use identical 14-TSSOP packaging with 0.173" width and 4.40mm dimensions. Pin compatibility is determined by the base product design within the LM274x family. Refer to individual device datasheets for pinout verification.

Q: What does "Last Time Buy" status mean for the LM2743MTC?

A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Existing inventory (100,962 pieces) represents the final available stock. For long-term supply assurance, transition to Active status equivalents such as LM2743MTC/NOPB, LM2744MTC/NOPB, or LM2747MTC/NOPB.

Q: Are all substitute parts ROHS3 compliant?

A: LM2743MTC/NOPB and LM2747MTC/NOPB are explicitly ROHS3 compliant. LM2744MTC/NOPB RoHS status is not specified in available data; confirm compliance requirements with the manufacturer or supplier before selection.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions and does not require special handling or baking before assembly. LM2744MTC/NOPB lists MSL as Vendor Undefined; confirm moisture handling requirements with the supplier to ensure compatibility with your assembly process specifications.

Q: Can LM2747MTC/NOPB with 86% maximum duty cycle be used in designs specified for 80% duty cycle?

A: Yes. The 86% duty cycle capability of LM2747MTC/NOPB exceeds the 80% requirement, providing backward compatibility. Designs specified for 80% maximum duty cycle will operate within the LM2747MTC/NOPB capability envelope.