LM2745MTCX Equivalent & Substitute Parts

Part Overview

The LM2745MTCX is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 14-TSSOP package. This device functions as a transistor driver for step-down voltage conversion with synchronous rectification capability. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

LM2745MTCX

Texas InstrumentsIn Stock: 2245LM2745MTCX Datasheet

Current PartRFQ

LM2745MTCX/NOPB

National SemiconductorIn Stock: 10745LM2745MTCX/NOPB Datasheet

Parametric EquivalentRFQ

LM2748MTCX/NOPB

Texas InstrumentsIn Stock: 4782LM2748MTCX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2745MTCX are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Topology: Buck (step-down DC-DC controller)
• Output Type: Transistor Driver
• Output Configuration: Positive
• Package / Case: 14-TSSOP (0.173", 4.40mm Width)
• Voltage - Supply (Vcc/Vdd): 3V ~ 6V
• Frequency - Switching: 50kHz ~ 1MHz
• Duty Cycle (Max): 86%
• Synchronous Rectifier: Yes
• Clock Sync: Yes
• Control Features: Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
• Operating Temperature: -40°C ~ 125°C (TJ)

All identified substitute parts maintain identical electrical specifications and mechanical compatibility with the original LM2745MTCX design.

Parameter Comparison

Engineering Selection Recommendations

LM2745MTCX/NOPB (National Semiconductor): This part is an active product with identical electrical and mechanical specifications to the obsolete LM2745MTCX. It provides direct functional equivalence and is suitable for replacement in new designs and production continuity. The NOPB designation indicates lead-free compliance.

LM2748MTCX/NOPB (Texas Instruments): This part is an active product manufactured by the original equipment supplier with identical electrical and mechanical specifications. It offers ROHS3 compliance, providing enhanced environmental and regulatory alignment compared to the original obsolete part. The Tape & Reel packaging format supports high-volume production requirements.

Both substitute parts maintain full electrical compatibility and identical package geometry, enabling direct substitution without circuit redesign or PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can LM2745MTCX/NOPB and LM2748MTCX/NOPB be used interchangeably with the original LM2745MTCX?

A: Yes. Both substitute parts maintain identical electrical specifications, control features, operating temperature range, and 14-TSSOP package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between the two substitute parts?

A: LM2745MTCX/NOPB is manufactured by National Semiconductor and supplied in bulk packaging. LM2748MTCX/NOPB is manufactured by Texas Instruments and supplied in Tape & Reel format. LM2748MTCX/NOPB includes ROHS3 compliance certification. Both maintain identical electrical performance and package compatibility.

Q: Does the packaging format (Bulk vs. Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and production automation compatibility. Electrical specifications and functional performance remain identical regardless of packaging type.

Q: Are there any compliance differences between the original part and substitutes?

A: The original LM2745MTCX is RoHS non-compliant. LM2748MTCX/NOPB is ROHS3 compliant. All three parts maintain REACH Unaffected and EAR99 export classification status.

Q: Can these parts be used in new designs?

A: Yes. Both LM2745MTCX/NOPB and LM2748MTCX/NOPB are active products suitable for new design implementation. LM2748MTCX/NOPB is recommended for designs requiring RoHS3 compliance.