LM2742MTC Buck Regulator Controller IC Equivalent & Substitute Parts

Part Overview

The LM2742MTC is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 14-TSSOP package. This component functions as a transistor driver for step-down voltage conversion applications with a single output phase. The LM2742MTC is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

LM2742MTC

Texas InstrumentsIn Stock: 5445LM2742MTC Datasheet

Current PartRFQ

LM2742MTC/NOPB

Texas InstrumentsIn Stock: 911LM2742MTC/NOPB Datasheet

DirectRFQ

LM2727MTC/NOPB

Texas InstrumentsIn Stock: 981LM2727MTC/NOPB Datasheet

Parametric EquivalentRFQ

LM2737MTC/NOPB

Texas InstrumentsIn Stock: 5494LM2737MTC/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2742MTC is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck (step-down) topology with positive output configuration
• Output Characteristics: Single output, single phase transistor driver
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, switching frequency 50kHz ~ 2MHz, maximum duty cycle 90%
• Control Features: Current limit, enable, frequency control, power good, and soft start capabilities
• Package Compatibility: 14-TSSOP surface mount package with identical physical dimensions
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• Synchronous Rectifier: Integrated synchronous rectifier functionality

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters, ensuring direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

LM2742MTC/NOPB is the direct manufacturer equivalent of the obsolete LM2742MTC. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The /NOPB designation indicates lead-free plating, aligning with modern manufacturing standards. This is the primary replacement for the original LM2742MTC.

LM2727MTC/NOPB and LM2737MTC/NOPB are parametric equivalents that provide identical functional performance across all specified electrical parameters and package configuration. Both parts are active products with ROHS3 compliance. Selection between these alternatives depends on design-specific requirements and availability considerations, as all three substitute parts are functionally interchangeable within the specified parameter set.

All substitute parts maintain compliance with REACH regulations and feature unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard storage and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can LM2742MTC/NOPB directly replace the obsolete LM2742MTC?

A: Yes. LM2742MTC/NOPB is the direct manufacturer equivalent with identical electrical specifications, package configuration, and functional characteristics. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LM2742MTC/NOPB, LM2727MTC/NOPB, and LM2737MTC/NOPB?

A: All three parts are parametric equivalents with identical specifications across topology, output configuration, supply voltage, switching frequency, duty cycle, control features, and package type. The base product numbers (LM2742, LM2727, LM2737) differ, but functional performance is equivalent within the specified parameter set.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are supplied in 14-TSSOP surface mount packages with identical physical dimensions (0.173", 4.40mm width), ensuring direct PCB compatibility.

Q: Do the substitute parts meet current compliance standards?

A: Yes. LM2742MTC/NOPB, LM2727MTC/NOPB, and LM2737MTC/NOPB are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What is the significance of the /NOPB designation?

A: The /NOPB suffix indicates lead-free plating on the component leads, reflecting modern manufacturing standards and environmental compliance requirements.

Q: Are there any differences in control features between the main part and substitutes?

A: No. All parts include identical control features: current limit, enable, frequency control, power good, and soft start functionality.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the constraints of the specified electrical and mechanical parameters. All substitute parts maintain the same supply voltage range (4.5V ~ 5.5V), switching frequency capability (50kHz ~ 2MHz), duty cycle (90% max), and operating temperature range (-40°C ~ 125°C).