LM2745MTC Buck Regulator Controller IC Equivalent & Substitute Parts

Part Overview

The LM2745MTC 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 applications with a single output phase. The LM2745MTC is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Type	Transistor Driver
Output Configuration	Positive
Number of Outputs	1
Output Phases	1
Voltage Supply Range (Vcc/Vdd)	3V ~ 6V
Switching Frequency Range	50kHz ~ 1MHz
Maximum Duty Cycle	86%
Synchronous Rectifier	Yes
Clock Sync	Yes
Control Features	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM2745MTC are identified based on strict equivalence across the following critical parameters:

Topology & Function: Buck (step-down) configuration with transistor driver output
Electrical Specifications: Voltage supply range 3V ~ 6V, switching frequency 50kHz ~ 1MHz, duty cycle maximum 86%
Control Features: Current limit, enable, frequency control, power good, soft start, and tracking capabilities
Output Configuration: Single positive output, single phase
Synchronous Operation: Synchronous rectifier and clock sync functionality
Package Compatibility: 14-TSSOP surface mount package with identical 0.173" (4.40mm) width
Temperature Range: -40°C ~ 125°C operating range

Substitutes are grouped into two categories: direct manufacturer equivalents and parametric equivalents from alternative manufacturers. All listed parts maintain 100% compatibility across the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	LM2745MTC	LM2745MTC/NOPB	LM2748MTC/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor
Function	Step-Down	Step-Down	Step-Down
Output Type	Transistor Driver	Transistor Driver	Transistor Driver
Output Configuration	Positive	Positive	Positive
Number of Outputs	1	1	1
Output Phases	1	1	1
Voltage Supply Range	3V ~ 6V	3V ~ 6V	3V ~ 6V
Switching Frequency Range	50kHz ~ 1MHz	50kHz ~ 1MHz	50kHz ~ 1MHz
Maximum Duty Cycle	86%	86%	86%
Synchronous Rectifier	Yes	Yes	Yes
Clock Sync	Yes	Yes	Yes
Control Features	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	14-TSSOP (0.173", 4.40mm Width)	14-TSSOP (0.173", 4.40mm Width)	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

LM2745MTC/NOPB is the primary substitute for the obsolete LM2745MTC. This part is manufactured by Texas Instruments and maintains identical electrical and mechanical specifications. The LM2745MTC/NOPB is currently in active production status with significantly higher inventory availability (24,526 pcs vs. 3,236 pcs for the original). This part is RoHS3 compliant, addressing modern regulatory requirements that the original LM2745MTC does not meet.

LM2748MTC/NOPB is a parametric equivalent manufactured by National Semiconductor. This part provides identical functional performance across all critical electrical parameters and maintains the same 14-TSSOP package footprint. The LM2748MTC/NOPB is also in active production status. Selection of this part may be appropriate when National Semiconductor supply chain advantages or specific design requirements favor this manufacturer.

For new designs or production continuity, the LM2745MTC/NOPB is the recommended primary choice due to manufacturer continuity with Texas Instruments and active product status with robust inventory levels.

Frequently Asked Questions (FAQ)

Q: Can the LM2745MTC/NOPB directly replace the obsolete LM2745MTC?

A: Yes. The LM2745MTC/NOPB is a direct equivalent with identical electrical specifications, control features, and 14-TSSOP package configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance level.

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

A: Both parts are parametric equivalents with identical electrical performance across all specified parameters. The primary differences are manufacturer (Texas Instruments vs. National Semiconductor) and base product number (LM2745 vs. LM2748). Both maintain the same 14-TSSOP package and control feature set.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 14-TSSOP package with identical 0.173" (4.40mm) width and surface mount configuration, ensuring mechanical and electrical pin compatibility.

Q: Does the LM2745MTC/NOPB meet current regulatory requirements?

A: Yes. The LM2745MTC/NOPB is RoHS3 compliant and REACH unaffected, meeting current regulatory standards. The original LM2745MTC is RoHS non-compliant.

Q: What control features are supported by all substitute parts?

A: All substitute parts support current limit, enable, frequency control, power good, soft start, and tracking control features.

Q: Can these parts operate across the full -40°C to 125°C temperature range?

A: Yes. All three parts are rated for -40°C to 125°C junction temperature operation.

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