LM2748MTC Equivalent & Substitute Parts

Part Overview

The LM2748MTC is a buck regulator positive output step-down DC-DC controller IC in 14-TSSOP packaging, designed for power management applications requiring voltage regulation from 3V to 6V supply inputs. This device features synchronous rectification, programmable switching frequency, and integrated control features including current limiting, soft start, and power good monitoring.

The LM2748MTC is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this controller.

Substiute Parts

LM2748MTC

Texas InstrumentsIn Stock: 1529LM2748MTC Datasheet

Current PartRFQ

LM2748MTC/NOPB

National SemiconductorIn Stock: 1345LM2748MTC/NOPB Datasheet

DirectRFQ

LM2745MTC/NOPB

Texas InstrumentsIn Stock: 24558LM2745MTC/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2748MTC are identified based on strict equivalence across the following critical parameters:

• Topology: Buck (step-down) configuration
• Output type: Transistor driver
• Output configuration: Positive output
• Single output, single phase architecture
• Voltage supply range: 3V ~ 6V
• Switching frequency capability: 50kHz ~ 1MHz
• Maximum duty cycle: 86%
• Synchronous rectification and clock synchronization support
• Control feature set: Current limit, enable, frequency control, power good, soft start, tracking
• Operating temperature range: -40°C ~ 125°C
• Package: 14-TSSOP surface mount

Two substitute parts meet these criteria:

1. LM2748MTC/NOPB (Direct Manufacturer Equivalent) – National Semiconductor variant with identical electrical and mechanical specifications, available in bulk packaging
2. LM2745MTC/NOPB (Parametric Equivalent) – Texas Instruments alternative with matching functional parameters and active product status

Parameter Comparison

Engineering Selection Recommendations

LM2748MTC/NOPB is the direct manufacturer equivalent with active product status and confirmed inventory availability (1320 pcs). This part maintains identical electrical and mechanical specifications to the original LM2748MTC and provides immediate supply chain continuity for applications requiring the exact original device characteristics.

LM2745MTC/NOPB is the parametric equivalent offering superior long-term availability (24526 pcs in stock) and active product status. This part meets all functional requirements and provides ROHS3 compliance, making it suitable for applications with regulatory compliance requirements. The LM2745MTC/NOPB is the preferred selection for new designs and applications where regulatory compliance is a design criterion.

Both substitute parts are pin-compatible within the 14-TSSOP package and support identical control feature sets and operating parameters. Selection between these options depends on compliance requirements and supply chain strategy.

Frequently Asked Questions (FAQ)

Q: Can LM2748MTC/NOPB be used as a direct replacement for LM2748MTC?

A: Yes. The LM2748MTC/NOPB is a direct manufacturer equivalent with identical electrical specifications, control features, and 14-TSSOP packaging. Both parts operate within the same voltage supply range (3V ~ 6V), switching frequency range (50kHz ~ 1MHz), and temperature range (-40°C ~ 125°C). Pin-to-pin compatibility is maintained.

Q: What is the difference between LM2748MTC/NOPB and LM2745MTC/NOPB?

A: Both parts are parametric equivalents with identical functional specifications for buck regulation topology, output configuration, control features, and package type. The primary differences are manufacturer (National Semiconductor vs. Texas Instruments), product status (both active), and regulatory compliance (LM2745MTC/NOPB is ROHS3 compliant). Inventory availability differs significantly, with LM2745MTC/NOPB offering substantially higher stock levels.

Q: Are these parts pin-compatible?

A: Yes. All three parts use the 14-TSSOP package with identical pinout and mechanical dimensions (0.173" width, 4.40mm). Direct PCB layout compatibility is maintained across all substitutes.

Q: Which substitute should be selected for new designs?

A: LM2745MTC/NOPB is recommended for new designs due to active product status, ROHS3 compliance, and superior long-term availability. This part meets all functional requirements and provides regulatory compliance for applications with environmental or procurement standards.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by matching topology (buck), output type (transistor driver), output configuration (positive), voltage supply range (3V ~ 6V), switching frequency capability (50kHz ~ 1MHz), duty cycle (86% maximum), synchronous rectification support, control feature set, operating temperature range (-40°C ~ 125°C), and 14-TSSOP package type. All three parts meet these criteria.

Q: Is there a difference in control features between these parts?

A: No. All three parts support identical control features: current limit, enable, frequency control, power good, soft start, and tracking. Functional capability is equivalent across all substitutes.