MBR1545CT Equivalent & Substitute Parts

Part Overview

The MBR1545CT is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode. Manufactured by Taiwan Semiconductor Corporation, this component features fast recovery characteristics (≤500 ns) and is housed in a TO-220-3 through-hole package. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
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	840 mV @ 15 A
Speed	Fast Recovery ≤500 ns, >200 mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MBR1545CT 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
Package / Case: TO-220-3

Allowable Variation Parameters:

Voltage - Forward (Vf): Acceptable within engineering tolerance for circuit operation
Current - Reverse Leakage @ Vr: Acceptable within engineering tolerance
Operating Temperature - Junction: Extended ranges acceptable for broader application scope
Supplier Device Package designation: Acceptable variation (TO-220AB, TO-220)

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all mandatory matching parameters with identical electrical ratings.

Similar Substitutes: Parts meeting all mandatory matching parameters with variations in forward voltage characteristics, reverse leakage current, or extended operating temperature ranges that remain functionally compatible within the 45 V / 15 A specification envelope.

Parameter Comparison

Part Number	Manufacturer	Diode Configuration	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Operating Temp (Junction)	Package	Product Status
MBR1545CT	Taiwan Semiconductor Corporation	1 Pair Common Cathode	45 V	15 A	840 mV @ 15 A	500 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Discontinued
MBR1545CT	Solid State Inc.	2 Independent	45 V	15 A	Not Specified	Not Specified	Not Specified	TO-220-3	Active
SBR1545CT	SMC Diode Solutions	1 Pair Common Cathode	45 V	Not Specified	720 mV @ 7.5 A	1 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSA60C45PB	IXYS	1 Pair Common Cathode	45 V	30 A	790 mV @ 30 A	900 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	1 Pair Common Cathode	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
MBR2045CT-LJ-01	Diodes Incorporated	1 Pair Common Cathode	45 V	10 A	640 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR2545CT-E3/45	Vishay General Semiconductor - Diodes Division	1 Pair Common Cathode	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	-65°C ~ 150°C	TO-220-3	Active
MBR2545CTG	onsemi	1 Pair Common Cathode	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
MBR2550CT	Diodes Incorporated	1 Pair Common Cathode	50 V	15 A	750 mV @ 15 A	1 mA @ 50 V	-65°C ~ 150°C	TO-220-3	Obsolete
MBR3045CT-BP	Micro Commercial Co	1 Pair Common Cathode	45 V	15 A	700 mV @ 15 A	200 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR3045CTE3/TU	Microchip Technology	1 Pair Common Cathode	45 V	15 A	700 mV @ 15 A	50 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The following parts provide direct functional equivalence to the MBR1545CT with 45 V / 15 A ratings and 1 Pair Common Cathode configuration:

MBR2545CTG (onsemi): Active product status with ROHS3 compliance. Forward voltage of 620 mV @ 15 A represents improved efficiency compared to the original 840 mV specification. Extended operating temperature range (-65°C ~ 175°C) and SWITCHMODE™ series designation provide enhanced thermal performance.
MBR3045CT-BP (Micro Commercial Co): Active product status with ROHS3 compliance. Forward voltage of 700 mV @ 15 A and reverse leakage of 200 µA @ 45 V provide stable electrical characteristics. TO-220AB supplier package designation maintains mechanical compatibility.
MBR3045CTE3/TU (Microchip Technology): Active product status with ROHS3 compliance. Forward voltage of 700 mV @ 15 A with significantly reduced reverse leakage (50 µA @ 45 V). Extended operating temperature range (-65°C ~ 175°C) supports broader application environments.

Secondary Substitutes (Conditional Compatibility):

MBR2545CT-E3/45 (Vishay General Semiconductor - Diodes Division): Meets 45 V / 15 A specification with 1 Pair Common Cathode configuration. Forward voltage specification at 30 A (820 mV) requires verification for 15 A operation. Active product status with ROHS3 compliance.
SBR1545CT (SMC Diode Solutions): Meets 45 V / 1 Pair Common Cathode specification. Current rating not specified in available data. Forward voltage of 720 mV @ 7.5 A indicates lower current capability than the 15 A requirement. Active product status with ROHS3 compliance and REACH Affected designation.

Higher Current Capability (Derating Application):

DSA60C45PB (IXYS): Rated for 30 A per diode at 45 V with 1 Pair Common Cathode configuration. Suitable for applications requiring current derating margin or future design headroom. Active product status with ROHS3 compliance and extended operating temperature range (-55°C ~ 175°C).

Not Recommended:

MBR1545CT-E3/45 (Vishay): Rated for 7.5 A per diode, insufficient for 15 A requirement.
MBR2045CT-LJ-01 (Diodes Incorporated): Rated for 10 A per diode, insufficient for 15 A requirement.
MBR2550CT (Diodes Incorporated): Obsolete product status. 50 V rating exceeds application requirement.
MBR1545CT (Solid State Inc.): 2 Independent configuration does not match 1 Pair Common Cathode requirement.

Frequently Asked Questions (FAQ)

Q: Can MBR2545CTG be used as a direct replacement for MBR1545CT?

A: Yes. MBR2545CTG meets all mandatory parameters: 45 V reverse voltage, 15 A average rectified current per diode, 1 Pair Common Cathode configuration, TO-220-3 package, and through-hole mounting. The lower forward voltage (620 mV @ 15 A versus 840 mV) represents improved performance. Active product status ensures ongoing availability.

Q: What is the difference between "1 Pair Common Cathode" and "2 Independent" diode configurations?

A: 1 Pair Common Cathode means two diodes share a common cathode terminal, resulting in three external leads. 2 Independent means two separate diodes with independent cathode connections, requiring different circuit topology. These configurations are not interchangeable without circuit redesign.

Q: Is MBR3045CTE3/TU suitable for the MBR1545CT application?

A: Yes. MBR3045CTE3/TU meets all mandatory electrical parameters (45 V, 15 A, 1 Pair Common Cathode, TO-220-3). The significantly lower reverse leakage current (50 µA versus 500 µA) and extended operating temperature range (-65°C ~ 175°C) provide enhanced performance margins. Active product status with ROHS3 compliance confirms suitability.

Q: Why is MBR1545CT-E3/45 listed as a similar substitute if it is only rated for 7.5 A?

A: MBR1545CT-E3/45 shares the same base product number (MBR1545) and configuration (1 Pair Common Cathode, 45 V, TO-220-3). However, the 7.5 A current rating is insufficient for applications requiring the full 15 A specification. This part is suitable only for applications with reduced current requirements.

Q: Can DSA60C45PB be used in place of MBR1545CT?

A: Yes, with design consideration. DSA60C45PB meets all mandatory parameters and provides 30 A per diode capability, exceeding the 15 A requirement. This higher rating provides design margin and derating capability. The part is suitable for applications where current headroom is beneficial. Active product status and extended operating temperature range (-55°C ~ 175°C) support long-term availability.

Q: What is the significance of the TO-220AB versus TO-220 supplier package designation?

A: Both designations refer to the same physical TO-220-3 package form factor and pin configuration. The suffix variation (AB versus standard) indicates minor manufacturing or supplier-specific differences that do not affect mechanical or electrical compatibility in through-hole applications.

Q: Is SBR1545CT a suitable replacement?

A: SBR1545CT meets the 45 V / 1 Pair Common Cathode / TO-220-3 specification. However, the current rating is not specified in available data, and the forward voltage specification (720 mV @ 7.5 A) suggests lower current capability than the 15 A requirement. Verification of current rating specifications is necessary before selection.

Q: Why is MBR2550CT listed if it is obsolete?

A: MBR2550CT is included for reference purposes only. The part is obsolete and not recommended for new designs. The 50 V rating exceeds the 45 V application requirement, and obsolete status indicates unavailability for procurement.

Q: What compliance certifications are important for substitute selection?

A: All listed substitute parts maintain ROHS3 compliance, matching the original MBR1545CT specification. REACH status varies by manufacturer; parts designated as REACH Unaffected or REACH Compliant are preferred for applications with regulatory requirements. Moisture Sensitivity Level (MSL) 1 (Unlimited) is maintained across all substitutes, indicating no special handling requirements.

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