MBR2045CT Equivalent & Substitute Parts

Part Overview

The MBR2045CT is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 20 A per diode. The device is packaged in TO-220-3 through-hole configuration and features fast recovery characteristics suitable for high-frequency rectification applications.

The MBR2045CT is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating variations in forward voltage, reverse leakage current, and thermal characteristics.

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)	20	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR2045CT is determined by the following critical parameters:

Primary Substitution Criteria:

Diode configuration must remain 1 pair common cathode
Technology must be Schottky or Super Barrier (functionally compatible fast-recovery rectifier types)
Maximum reverse voltage (Vr) must be 45 V or greater
Average rectified current (Io) per diode must be 20 A or greater
Package must be TO-220-3 or compatible through-hole variant
Operating temperature range must encompass -55°C to 150°C minimum

Secondary Compatibility Factors:

Forward voltage (Vf) variation is acceptable within typical application tolerances
Reverse leakage current (Ir) variation is acceptable provided it does not exceed application requirements
Mounting type must remain through-hole
RoHS3 compliance is required for new production applications

Substitute parts are grouped into three categories: direct manufacturer equivalents (same base part number, different packaging or current rating), cross-manufacturer alternatives (different manufacturer, equivalent electrical specifications), and parametric equivalents (functionally compatible with specified parameter ranges).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (per Diode) A	Vf (Max) mV	Ir @ 45V µA	Tj (Max) °C	Package	Status
MBR2045CT	Diodes Incorporated	45	20	840 @ 20A	100	150	TO-220-3	Obsolete
MBR2045CTP	Diodes Incorporated	45	10	650 @ 10A	100	150	TO-220-3 Isolated Tab	Obsolete
MBR2045CTU	SMC Diode Solutions	45	—	810 @ 20A	1000	150	TO-220-3	Active
SBR2045CT	Diodes Incorporated	45	10	540 @ 10A	500	150	TO-220-3	Active
20CTQ045	SMC Diode Solutions	45	20	800 @ 20A	1000	150	TO-220-3	Active
MBR2045CT-BP	Micro Commercial Co	45	20	—	100	150	TO-220-3	Active
MBR20L45CTG	onsemi	45	10	500 @ 10A	500	150	TO-220-3	Obsolete
STPS2045CT	STMicroelectronics	45	10	570 @ 10A	100	175	TO-220-3	Active
STPS40L45CT	STMicroelectronics	45	20	530 @ 20A	600	150	TO-220-3	Active

Engineering Selection Recommendations

For 20 A Applications (Direct Current Rating Match):

The STPS40L45CT (STMicroelectronics) and 20CTQ045 (SMC Diode Solutions) are active production alternatives that maintain the 20 A average rectified current specification of the MBR2045CT. Both devices are RoHS3 compliant and feature TO-220-3 packaging. The STPS40L45CT offers superior forward voltage characteristics (530 mV @ 20 A) compared to the original specification (840 mV @ 20 A), resulting in reduced power dissipation. The MBR2045CT-BP (Micro Commercial Co) provides an active alternative with matching electrical specifications and current rating.

For 10 A Applications (Reduced Current Rating):

The SBR2045CT (Diodes Incorporated, Super Barrier technology) and STPS2045CT (STMicroelectronics) are active production alternatives rated for 10 A average rectified current. These devices are suitable for applications where the full 20 A capability is not required. The SBR2045CT features the lowest forward voltage (540 mV @ 10 A) among 10 A alternatives. The STPS2045CT provides extended maximum junction temperature (175°C) compared to the original specification (150°C).

Compliance and Availability:

All recommended active alternatives maintain RoHS3 compliance and REACH compliance status appropriate for their respective manufacturers. The STPS40L45CT and 20CTQ045 are preferred for new designs requiring 20 A capability due to active production status and established supply chains. For applications tolerating 10 A operation, the SBR2045CT offers the lowest forward voltage dissipation characteristics.

Frequently Asked Questions (FAQ)

Q: Can the MBR2045CT be replaced with a 10 A rated device such as SBR2045CT or STPS2045CT?

A: Substitution is possible only if the application circuit operates at or below 10 A average rectified current. The 10 A rated devices are not suitable for applications requiring the full 20 A capability of the original MBR2045CT. Verify actual circuit current requirements before selecting a reduced-current alternative.

Q: What is the difference between Schottky and Super Barrier diode technologies in the MBR2045CT substitutes?

A: Both Schottky and Super Barrier technologies are fast-recovery rectifier types suitable for high-frequency applications. The SBR2045CT uses Super Barrier technology and exhibits lower forward voltage (540 mV @ 10 A) compared to standard Schottky devices. Both technologies meet the fast recovery specification (≤ 500ns) required for the MBR2045CT application.

Q: Are the TO-220-3 and TO-220-3 Isolated Tab packages interchangeable?

A: The TO-220-3 Isolated Tab variant (MBR2045CTP) features electrical isolation between the tab and the semiconductor junction, whereas standard TO-220-3 packages have the tab connected to one of the internal leads. Package selection depends on circuit board thermal management design and electrical isolation requirements. Verify PCB layout compatibility before substituting between these package variants.

Q: What is the significance of forward voltage variation among substitute parts?

A: Forward voltage (Vf) directly affects power dissipation and thermal performance. The MBR2045CT specifies 840 mV @ 20 A, while the STPS40L45CT specifies 530 mV @ 20 A. Lower forward voltage reduces heat generation and improves efficiency. Verify that thermal management design accommodates the selected device's power dissipation characteristics.

Q: Why do some substitute parts specify higher reverse leakage current?

A: Reverse leakage current (Ir) varies among manufacturers and device technologies. The MBR2045CT specifies 100 µA @ 45 V, while some alternatives specify up to 1000 µA @ 45 V. Higher leakage current increases standby power consumption and heat generation. Verify that application circuit design tolerates the leakage current specification of the selected substitute.

Q: Is the MBR2045CT-BP suitable for new production designs?

A: Yes. The MBR2045CT-BP (Micro Commercial Co) is classified as active production status and maintains the 20 A current rating and 45 V reverse voltage specification of the original MBR2045CT. It is suitable for new designs requiring direct electrical equivalence.

Q: What is the advantage of STPS40L45CT over other 20 A alternatives?

A: The STPS40L45CT offers the lowest forward voltage (530 mV @ 20 A) among active 20 A alternatives, resulting in reduced power dissipation and improved thermal performance. It is manufactured by STMicroelectronics with established supply chain availability and active production status.

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