SBR3045CT Equivalent & Substitute Parts

Part Overview

The SBR3045CT is a Schottky diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode device rated for 45 V DC reverse voltage. This through-hole component in TO-220-3 package is designed for fast recovery rectification applications with forward voltage of 800 mV at 15 A and reverse leakage current of 1 mA at 45 V. The part maintains Active product status with full RoHS3 compliance and REACH affected designation.

Substitute parts are necessary when the original SBR3045CT becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from equivalent devices meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Voltage - Forward (Vf) (Max) @ If	800 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SBR3045CT is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Mounting Type: Through Hole
Package / Case: TO-220-3
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: May vary within acceptable rectification performance
Current - Reverse Leakage @ Vr: May vary within acceptable leakage specifications
Operating Temperature - Junction: May extend beyond original range
RoHS and REACH compliance status: May differ based on manufacturing location and process

Substitute parts identified in this reference meet all mandatory matching parameters while demonstrating compatibility with the SBR3045CT in equivalent circuit applications.

Parameter Comparison

Parameter	SBR3045CT (Main)	MBR2545CTG	MBR2550CT	MBRP1545NTU
Manufacturer	SMC Diode Solutions	onsemi	Diodes Incorporated	Fairchild Semiconductor
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	50 V	45 V
Current - Average Rectified (Io) (per Diode)	Not specified	15A	15A	15A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 15 A	620 mV @ 15 A	750 mV @ 15 A	800 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V	200 µA @ 45 V	1 mA @ 50 V	1 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitute: MBR2545CTG (onsemi)

The MBR2545CTG is the preferred substitute for the SBR3045CT. This part maintains identical diode configuration, technology, voltage rating, and package specifications. The MBR2545CTG demonstrates superior performance characteristics with lower forward voltage (620 mV vs. 800 mV at 15 A) and reduced reverse leakage current (200 µA vs. 1 mA at 45 V). The device carries Active product status with ROHS3 compliance and extended operating temperature range (-65°C to 175°C). Availability is confirmed at 15,312 pieces in stock.

Secondary Substitute: MBRP1545NTU (Fairchild Semiconductor)

The MBRP1545NTU provides parametric equivalence to the SBR3045CT with identical electrical specifications including forward voltage (800 mV @ 15 A) and reverse leakage current (1 mA @ 45 V). This device maintains Active product status and is available in bulk packaging with 1,200 pieces in stock. Operating temperature range extends to -65°C minimum, providing enhanced low-temperature performance.

Not Recommended: MBR2550CT (Diodes Incorporated)

The MBR2550CT carries Obsolete product status and is not recommended for new designs or long-term supply chain planning. While the device meets core electrical parameters with 50 V reverse voltage rating and identical package configuration, the obsolete designation indicates discontinued manufacturing and limited future availability.

Frequently Asked Questions (FAQ)

Q: Can the MBR2545CTG directly replace the SBR3045CT in existing designs?

A: Yes. The MBR2545CTG meets all mandatory electrical and mechanical parameters for direct substitution. The device shares identical diode configuration (1 Pair Common Cathode), technology (Schottky), voltage rating (45 V), and package (TO-220-3). The lower forward voltage characteristic (620 mV vs. 800 mV) represents improved performance without circuit modification requirements.

Q: What is the difference between the SBR3045CT and MBRP1545NTU?

A: Both devices are parametrically equivalent with matching forward voltage (800 mV @ 15 A), reverse voltage (45 V), and reverse leakage current (1 mA @ 45 V). The primary differences are manufacturer (SMC Diode Solutions vs. Fairchild Semiconductor) and packaging format (standard vs. bulk). The MBRP1545NTU offers extended minimum operating temperature (-65°C vs. -55°C).

Q: Why is the MBR2550CT listed as a substitute if it is obsolete?

A: The MBR2550CT is included in the reference for historical documentation and supply chain awareness. The part meets core electrical specifications but carries Obsolete product status, indicating discontinued manufacturing. Selection of this part is not recommended for new applications or designs requiring long-term component availability.

Q: Are all substitute parts RoHS3 compliant?

A: The MBR2545CTG and MBR2550CT carry explicit ROHS3 compliance designation. The MBRP1545NTU does not specify RoHS status in the provided data. Compliance verification with the MBRP1545NTU manufacturer is required for applications with mandatory RoHS requirements.

Q: What is the significance of the TO-220-3 package specification?

A: The TO-220-3 package is a three-lead through-hole component with standardized mechanical and thermal characteristics. All listed substitute parts maintain this identical package specification, ensuring direct physical compatibility with existing PCB layouts and thermal management designs without modification.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage variation between substitute parts (620 mV to 800 mV at 15 A) affects rectification efficiency and heat dissipation. Lower forward voltage (MBR2545CTG at 620 mV) reduces power loss and junction temperature. Circuit designs with thermal margin or efficiency optimization may benefit from this characteristic. Designs with tight voltage regulation requirements should verify compatibility with the specific forward voltage of the selected substitute.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" indicate?

A: This specification defines the diode's switching speed and recovery characteristics. All listed parts meet this fast recovery criterion, indicating suitability for high-frequency rectification applications. The specification confirms recovery time does not exceed 500 nanoseconds for reverse current exceeding 200 milliamps, enabling reliable operation in switching power supplies and similar applications.

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