MBR3045CT Equivalent & Substitute Parts

Part Overview

The MBR3045CT is a Schottky diode array with 1 pair common cathode configuration, rated for 45 V DC reverse voltage and 15 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in TO-220-3 through-hole format with fast recovery characteristics (≤500 ns, >200 mA).

The MBR3045CT is classified as obsolete. Identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this component is specified or currently deployed.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 30 A	—
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBR3045CT is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 15 A
Mounting Type: Through Hole
Speed: Fast Recovery ≤500 ns, >200 mA (Io)

Package Compatibility:

Primary: TO-220-3 (direct mechanical and electrical compatibility)
Alternative: TO-247-3 (different form factor, same electrical performance)

Substitute parts are grouped into three categories:

Parametric Equivalents (Active Status): Parts with identical electrical specifications and active product status, offering improved compliance and availability.
Direct Equivalents (Alternate Manufacturers): Parts from different manufacturers meeting all core electrical and mechanical parameters, with varying product status.
Manufacturer Recommended Alternatives: Parts with minor parameter variations (forward voltage, leakage current, temperature range) that maintain functional compatibility within the 45 V / 15 A / Schottky / TO-220-3 specification envelope.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) [mV]	Ir @ Vr [mA/µA]	Tj Range [°C]	Package	Product Status	RoHS Status
MBR3045CT	Vishay General Semiconductor	45	15	760 @ 30 A	1 mA	-65 to 150	TO-220-3	Obsolete	Non-compliant
VS-MBR3045CT-M3	Vishay General Semiconductor	45	15	760 @ 30 A	1 mA	-65 to 150	TO-220-3	Active	ROHS3 Compliant
VS-MBR3045WT-N3	Vishay General Semiconductor	45	15	760 @ 30 A	1 mA	-65 to 150	TO-247-3	Active	ROHS3 Compliant
25CTQ045	Vishay General Semiconductor	45	15	560 @ 15 A	1.75 mA	-55 to 150	TO-220-3	Obsolete	Non-compliant
MBR3045CT	Good-Ark Semiconductor	45	0.03	—	0.2 µA	—	TO-220-3	Active	ROHS3 Compliant
MBR3045CTP	Diodes Incorporated	45	15	650 @ 15 A	0.2 µA	-65 to 150	TO-220-3 Isolated Tab	Obsolete	ROHS3 Compliant
SBR3045CT	Diodes Incorporated	45	15	550 @ 15 A	0.5 µA	-65 to 150	TO-220-3	Active	ROHS3 Compliant
MBR2545CTG	onsemi	45	15	620 @ 15 A	0.2 µA	-65 to 175	TO-220-3	Active	ROHS3 Compliant
MBR3045CT-BP	Micro Commercial Co	45	15	700 @ 15 A	0.2 µA	-55 to 150	TO-220-3	Active	ROHS3 Compliant
MBRP1545NTU	Fairchild Semiconductor	45	15	800 @ 15 A	1 mA	-65 to 150	TO-220-3	Active	—
MBRP3045NTU	Fairchild Semiconductor	45	15	650 @ 15 A	1 mA	-65 to 150	TO-220-3	Active	—

Engineering Selection Recommendations

Primary Recommendation: VS-MBR3045CT-M3

The VS-MBR3045CT-M3 is the direct parametric equivalent to the MBR3045CT. It maintains identical electrical specifications (45 V, 15 A, Schottky, fast recovery) and identical TO-220-3 packaging. The part is in active product status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original MBR3045CT. Inventory availability is confirmed at 776 pieces.

Secondary Recommendation: SBR3045CT (Diodes Incorporated)

The SBR3045CT meets all core electrical requirements (45 V, 15 A, fast recovery, TO-220-3) with active product status and ROHS3 compliance. Forward voltage is lower (550 mV @ 15 A versus 760 mV @ 30 A), resulting in reduced power dissipation. Reverse leakage is higher (500 µA versus 1 mA), which may be acceptable in most applications. This part uses Super Barrier technology rather than standard Schottky. Inventory availability is confirmed at 10,300 pieces.

Alternative for Elevated Temperature Applications: MBR2545CTG (onsemi)

The MBR2545CTG supports extended junction temperature range (-65°C to 175°C versus -65°C to 150°C). All other electrical parameters match the MBR3045CT specification. Product status is active with ROHS3 compliance. This part is suitable for applications requiring thermal margin beyond standard specifications. Inventory availability is confirmed at 15,312 pieces.

Package Alternative: VS-MBR3045WT-N3 (TO-247-3)

The VS-MBR3045WT-N3 provides identical electrical performance to VS-MBR3045CT-M3 but in TO-247-3 package format. This larger package offers improved thermal dissipation characteristics. Selection requires mechanical compatibility verification with the target PCB layout. Product status is active with ROHS3 compliance. Inventory availability is confirmed at 1,964 pieces.

Not Recommended: 25CTQ045

The 25CTQ045 exhibits higher reverse leakage (1.75 mA versus 1 mA) and narrower junction temperature range (-55°C to 150°C versus -65°C to 150°C). Product status is obsolete with non-compliant RoHS status. This part does not address the obsolescence issue of the original MBR3045CT.

Not Recommended: MBR3045CT (Good-Ark Semiconductor)

The Good-Ark variant is rated for only 30 mA average rectified current, not 15 A. This represents a significant current rating reduction and is not functionally equivalent for the specified application.

Frequently Asked Questions (FAQ)

Q: Can VS-MBR3045CT-M3 be used as a direct replacement for MBR3045CT?

A: Yes. The VS-MBR3045CT-M3 is a parametric equivalent with identical electrical specifications (45 V, 15 A, Schottky, fast recovery) and identical TO-220-3 packaging. No circuit modifications are required. The part is in active status with improved RoHS compliance.

Q: What is the difference between MBR3045CT and SBR3045CT?

A: Both parts meet the 45 V / 15 A / fast recovery / TO-220-3 specification. The SBR3045CT uses Super Barrier technology and exhibits lower forward voltage (550 mV versus 760 mV) and higher reverse leakage (500 µA versus 1 mA). The SBR3045CT is in active product status. Selection depends on whether the lower forward voltage and higher leakage are acceptable for the specific application.

Q: Why is the Good-Ark MBR3045CT not recommended as a substitute?

A: The Good-Ark variant is rated for 30 mA average rectified current, not 15 A. This represents a 500× reduction in current capacity and is not functionally equivalent for applications requiring 15 A operation.

Q: Can VS-MBR3045WT-N3 be used in place of VS-MBR3045CT-M3?

A: Electrical substitution is valid. Both parts have identical electrical specifications (45 V, 15 A, Schottky, fast recovery). However, the VS-MBR3045WT-N3 uses TO-247-3 package instead of TO-220-3. Mechanical compatibility with the PCB layout must be verified before selection. The larger TO-247-3 package provides improved thermal dissipation.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: The original MBR3045CT is RoHS non-compliant. Most active substitute parts (VS-MBR3045CT-M3, SBR3045CT, MBR2545CTG, MBR3045CT-BP) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, selection of a compliant part is mandatory.

Q: Is MBR3045CTP a suitable substitute?

A: The MBR3045CTP meets the core electrical specifications (45 V, 15 A, Schottky, fast recovery) but uses TO-220-3 Isolated Tab package instead of standard TO-220-3. This package variant is used in applications requiring electrical isolation of the tab from the case. Product status is obsolete. Substitution is valid only if the isolated tab feature is required or if standard TO-220-3 compatibility is not critical.

Q: Which substitute part offers the best thermal performance?

A: The VS-MBR3045WT-N3 (TO-247-3 package) provides the largest form factor and improved thermal dissipation compared to TO-220-3 variants. For applications with thermal constraints, this part is preferred if mechanical compatibility can be confirmed. The MBR2545CTG supports the highest junction temperature range (-65°C to 175°C), making it suitable for elevated ambient or high-power applications.

Q: Are there any forward voltage differences between substitute parts?

A: Yes. Forward voltage varies across substitutes: MBR3045CT (760 mV @ 30 A), 25CTQ045 (560 mV @ 15 A), MBR3045CTP (650 mV @ 15 A), SBR3045CT (550 mV @ 15 A), MBR2545CTG (620 mV @ 15 A), MBR3045CT-BP (700 mV @ 15 A), MBRP1545NTU (800 mV @ 15 A), MBRP3045NTU (650 mV @ 15 A). Lower forward voltage reduces power dissipation. Selection should consider thermal budget and efficiency requirements.

Q: What is the difference between Schottky and Super Barrier technology?

A: Both are fast-recovery diode technologies suitable for the 45 V / 15 A specification. Super Barrier (used in SBR3045CT) typically offers lower forward voltage and faster switching characteristics. Standard Schottky (used in most other substitutes) is the conventional technology. Both are functionally compatible for this application; selection depends on specific performance requirements.

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