MBR2545CT Equivalent & Substitute Parts

Part Overview

The MBR2545CT is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with 45 V reverse voltage rating and 30 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and classified as obsolete product status. Due to obsolescence, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

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)	30 A
Voltage - Forward (Vf) (Max) @ If	820 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MBR2545CT is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage rating: 45 V DC reverse maximum
Current rating: 30 A average rectified per diode
Package: TO-220-3 through-hole
Speed classification: Fast Recovery ≤ 500ns, > 200mA

Secondary Compatibility Factors:

Operating temperature range
Forward voltage characteristics
Reverse leakage current
RoHS and REACH compliance status

Parts are grouped into two categories: Direct Equivalents (matching all primary criteria with active product status) and Functional Alternatives (meeting primary criteria but with different current ratings or package variants).

Parameter Comparison

Part Number	Manufacturer	Io (A)	Vf (mV) @ If	Ir (µA) @ Vr	Tj (°C)	Package	Status	RoHS
MBR2545CT	Diodes Incorporated	30	820 @ 30A	200 @ 45V	-65 ~ 150	TO-220-3	Obsolete	ROHS3
DSA60C45PB	IXYS	30	790 @ 30A	900 @ 45V	-55 ~ 175	TO-220-3	Active	ROHS3
DSB60C45PB	IXYS	30	630 @ 30A	10 @ 45V	-55 ~ 150	TO-220-3	Active	ROHS3
MBR2545CT-BP	Micro Commercial Co	25	750 @ 15A	1 @ 45V	-55 ~ 150	TO-220-3	Active	Not Specified
25CTQ045	Vishay General Semiconductor	15	560 @ 15A	1750 @ 45V	-55 ~ 150	TO-220-3	Obsolete	Non-compliant
MBR3045CTP	Diodes Incorporated	15	650 @ 15A	200 @ 45V	-65 ~ 150	ITO-220S	Obsolete	ROHS3
SBR3045CT	Diodes Incorporated	15	550 @ 15A	500 @ 45V	-65 ~ 150	TO-220-3	Active	ROHS3
DSA20C45PB	IXYS	10	750 @ 10A	200 @ 45V	-55 ~ 175	TO-220-3	Active	ROHS3
DSA30C45PB	IXYS	15	750 @ 15A	300 @ 45V	-55 ~ 175	TO-220-3	Active	ROHS3
DSB30C45PB	IXYS	15	590 @ 15A	10 @ 45V	-55 ~ 150	TO-220-3	Active	ROHS3
MBR20L45CTG	onsemi	10	500 @ 10A	500 @ 45V	-55 ~ 150	TO-220-3	Obsolete	ROHS3

Engineering Selection Recommendations

Direct Equivalent for Active Production:

DSA60C45PB (IXYS) and DSB60C45PB (IXYS) are the primary active-status equivalents matching the 30 A current rating and 45 V voltage specification of the MBR2545CT. Both devices maintain TO-220-3 packaging and ROHS3 compliance. DSB60C45PB offers superior forward voltage characteristics (630 mV vs. 820 mV) and lower reverse leakage (10 µA vs. 200 µA), providing improved efficiency in rectification applications. DSA60C45PB extends operating temperature range to 175°C, suitable for elevated ambient conditions.

Alternative for Current-Derated Applications:

MBR2545CT-BP (Micro Commercial Co) provides 25 A rating with active product status and maintains TO-220-3 form factor. This part is suitable for designs tolerating reduced current capacity while preserving voltage and package compatibility.

Lower Current Alternatives:

DSA30C45PB, DSB30C45PB, and SBR3045CT provide 15 A ratings with active status and full ROHS3 compliance. These parts are applicable to designs with reduced current requirements. SBR3045CT employs Super Barrier technology with 550 mV forward voltage at 15 A, offering lower conduction losses than standard Schottky alternatives.

Obsolete Parts Requiring Replacement:

25CTQ045 (Vishay) and MBR3045CTP (Diodes Incorporated) are obsolete and should not be selected for new designs. 25CTQ045 additionally exhibits RoHS non-compliance.

Frequently Asked Questions (FAQ)

Q: Can DSA60C45PB directly replace MBR2545CT in existing designs?

A: Yes. DSA60C45PB matches the 30 A current rating, 45 V voltage specification, and TO-220-3 package. Both employ Schottky technology with fast recovery characteristics. Forward voltage differs (790 mV vs. 820 mV), resulting in marginally lower conduction losses. Operating temperature range extends to 175°C versus 150°C maximum for the original part.

Q: What is the difference between DSA60C45PB and DSB60C45PB?

A: Both parts share identical current (30 A) and voltage (45 V) ratings in TO-220-3 packaging. DSB60C45PB exhibits superior forward voltage performance (630 mV vs. 790 mV at 30 A) and significantly lower reverse leakage (10 µA vs. 900 µA at 45 V). DSA60C45PB provides extended temperature range (-55°C to 175°C vs. -55°C to 150°C). Selection depends on thermal and efficiency requirements.

Q: Are lower current-rated parts (15 A, 10 A) suitable substitutes?

A: Lower current-rated parts function as substitutes only in applications where design current does not exceed the substitute part rating. DSA30C45PB, DSB30C45PB, and SBR3045CT (all 15 A) and DSA20C45PB (10 A) maintain 45 V voltage compatibility and TO-220-3 packaging. Current derating must be verified against circuit requirements.

Q: What is the significance of the ITO-220S package variant in MBR3045CTP?

A: ITO-220S denotes an isolated tab variant of the TO-220-3 package. The tab is electrically isolated from the die, preventing direct thermal coupling to the mounting surface. This configuration is used in applications requiring electrical isolation between the device and heatsink. Standard TO-220-3 packages (MBR2545CT, DSA60C45PB, DSB60C45PB) feature electrically connected tabs and are not interchangeable with isolated variants without circuit modification.

Q: Why does MBR2545CT-BP show different forward voltage specifications?

A: MBR2545CT-BP forward voltage is specified at 15 A (750 mV) rather than 30 A. This reflects the part's 25 A maximum current rating. Forward voltage characteristics vary with current level; direct comparison requires measurement at identical current conditions. At 30 A operation, this part may exhibit higher voltage drop than specified.

Q: Are RoHS compliance differences significant for substitution?

A: ROHS3 compliance is mandatory for most commercial and industrial applications. MBR2545CT and all recommended active-status substitutes (DSA60C45PB, DSB60C45PB, SBR3045CT, DSA20C45PB, DSA30C45PB, DSB30C45PB) are ROHS3 compliant. 25CTQ045 is RoHS non-compliant and unsuitable for regulated markets.

Q: What thermal considerations apply when selecting between active alternatives?

A: Operating temperature range differs among substitutes. DSA60C45PB and DSA20C45PB extend to 175°C junction temperature, while DSB60C45PB, DSB30C45PB, and SBR3045CT are rated to 150°C. Forward voltage and reverse leakage characteristics affect thermal dissipation. Lower forward voltage (DSB60C45PB: 630 mV) reduces conduction losses compared to higher voltage alternatives (DSA60C45PB: 790 mV).

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