MBR1045CT Equivalent & Substitute Parts

Part Overview

The MBR1045CT is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 10 A average rectified current per diode. The device is packaged in a TO-220-3 through-hole format and features fast recovery characteristics with a maximum forward voltage of 800 mV at 10 A. The MBR1045CT is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

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)	10 A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 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 of the MBR1045CT 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 minimum
Mounting Type: Through Hole
Package / Case: TO-220-3

Performance Parameters (Allowable Variation):

Current - Average Rectified (Io): 10 A or greater
Voltage - Forward (Vf): Lower or equal values are acceptable
Current - Reverse Leakage: Lower or equal values are acceptable
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Substitute parts are grouped into three categories:

Direct Parametric Equivalents: Parts with identical or superior electrical specifications and active product status.

Functional Equivalents: Parts with matching core parameters but different current ratings or forward voltage characteristics that remain within acceptable operating margins.

Higher-Rated Alternatives: Parts with increased current capacity or voltage ratings that provide design flexibility for applications requiring enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Tj (Operating)	Product Status	Package
MBR1045CT	Taiwan Semiconductor Corporation	45 V	10 A	800 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	Discontinued	TO-220-3
MBR1045CTHC0G	Taiwan Semiconductor Corporation	45 V	10 A	800 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	Active	TO-220-3
MBR1045CTP	SMC Diode Solutions	45 V	Not Specified	700 mV @ 5 A	1 mA @ 45 V	-55°C ~ 150°C	Active	TO-220-3
SBR1045CT	SMC Diode Solutions	45 V	Not Specified	750 mV @ 5 A	1 mA @ 45 V	-55°C ~ 150°C	Active	TO-220-3
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	-65°C ~ 175°C	Active	TO-220-3
MBR2045CT-LJ-01	Diodes Incorporated	45 V	10 A	640 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	Active	TO-220-3
MBR2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	-65°C ~ 150°C	Active	TO-220-3
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65°C ~ 175°C	Active	TO-220-3
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	1 mA @ 50 V	-65°C ~ 150°C	Obsolete	TO-220-3
MBR3045CT-BP	Micro Commercial Co	45 V	15 A	700 mV @ 15 A	200 µA @ 45 V	-55°C ~ 150°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Recommendation: MBR1045CTHC0G

The MBR1045CTHC0G is the direct parametric equivalent to the MBR1045CT. This part maintains identical electrical specifications including 45 V reverse voltage, 10 A average rectified current, and 800 mV forward voltage at 10 A. The MBR1045CTHC0G is currently in active production status with 864 units in stock. This part includes AEC-Q101 automotive qualification, providing enhanced reliability documentation. RoHS3 compliance and REACH unaffected status match the original specification.

Secondary Recommendation: MBR2045CT-LJ-01

The MBR2045CT-LJ-01 from Diodes Incorporated provides equivalent current handling at 10 A with improved forward voltage performance at 640 mV versus 800 mV. This part maintains 45 V reverse voltage rating and TO-220-3 packaging. The device is actively produced with 5200 units in stock and carries AEC-Q101 automotive qualification. RoHS3 compliance and REACH unaffected status are maintained.

Higher-Current Alternatives: MBR2545CTG and MBR3045CT-BP

For applications requiring increased current capacity, the MBR2545CTG (onsemi) and MBR3045CT-BP (Micro Commercial Co) both provide 15 A average rectified current while maintaining 45 V reverse voltage and TO-220-3 packaging. The MBR2545CTG offers superior forward voltage performance at 620 mV at 15 A and extended operating temperature range to 175°C. The MBR3045CT-BP provides 700 mV forward voltage at 15 A. Both parts are in active production with substantial inventory availability.

Reduced-Current Alternative: MBR1545CT-E3/45

The MBR1545CT-E3/45 from Vishay provides 7.5 A average rectified current with improved forward voltage at 570 mV at 7.5 A. This part is suitable for applications where current requirements are lower than the original 10 A specification. Extended operating temperature range to 175°C and active production status support long-term availability.

Parts Not Recommended:

MBR1045CTP and SBR1045CT from SMC Diode Solutions lack specified average rectified current ratings, limiting their suitability for direct substitution. MBR2550CT is obsolete and should not be selected for new designs despite higher voltage rating.

Frequently Asked Questions (FAQ)

Q: Can MBR1045CTHC0G be used as a direct replacement for MBR1045CT?

A: Yes. The MBR1045CTHC0G maintains identical electrical specifications including 45 V reverse voltage, 10 A average rectified current per diode, 800 mV forward voltage at 10 A, and TO-220-3 packaging. The primary difference is active production status and AEC-Q101 automotive qualification.

Q: What is the significance of the forward voltage difference between MBR1045CT (800 mV) and MBR2045CT-LJ-01 (640 mV)?

A: Lower forward voltage reduces power dissipation in the diode. At 10 A, the MBR2045CT-LJ-01 dissipates approximately 1.6 W less power than the MBR1045CT, resulting in reduced thermal load and improved efficiency. This substitution is beneficial for applications sensitive to heat generation.

Q: Are MBR2545CTG and MBR3045CT-BP suitable substitutes if my application only requires 10 A?

A: Yes. Both parts are rated for 15 A average rectified current, which exceeds the 10 A requirement of the MBR1045CT. The higher current rating provides design margin without compromising performance. Both maintain 45 V reverse voltage and TO-220-3 packaging. The MBR2545CTG offers superior forward voltage performance at 620 mV at 15 A.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration contains two diodes with a shared cathode terminal. The common cathode connection is internal to the device. This configuration is essential for specific circuit topologies and cannot be substituted with different diode configurations.

Q: Why is MBR2550CT not recommended despite higher voltage rating?

A: MBR2550CT is listed as obsolete, indicating discontinued production. New designs should not depend on obsolete components due to unavailability and lack of long-term supply assurance. The 50 V rating provides no functional advantage over the 45 V rated alternatives in applications designed for 45 V operation.

Q: Can I use MBR1545CT-E3/45 if my circuit requires exactly 10 A?

A: MBR1545CT-E3/45 is rated for 7.5 A average rectified current, which is below the 10 A requirement. This part is suitable only for applications where the actual current demand does not exceed 7.5 A per diode. Exceeding the rated current will result in device failure.

Q: What is the importance of RoHS3 compliance and REACH status?

A: RoHS3 compliance indicates the device meets restrictions on hazardous substances in electrical and electronic equipment. REACH unaffected status confirms the component does not contain substances of very high concern requiring authorization. These certifications are mandatory for many applications, particularly in European markets and regulated industries.

Q: Are there packaging differences between TO-220-3 and TO-220AB?

A: TO-220-3 and TO-220AB refer to the same physical package format with three leads. The designations are manufacturer-specific nomenclature for the identical package. All listed substitutes maintain mechanical and electrical compatibility through the TO-220-3 package standard.

Q: What operating temperature range should I select for my application?

A: The MBR1045CT operates from -55°C to 150°C. Most direct substitutes maintain this range. MBR1545CT-E3/45 and MBR2545CTG extend the upper limit to 175°C, providing additional thermal margin in high-temperature environments. Select based on your application's actual operating temperature requirements.

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