MBR3045CT Equivalent & Substitute Parts

Part Overview

The MBR3045CT is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 30 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 currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary when the primary MBR3045CT becomes unavailable, when alternative packaging formats are required for specific board layouts, or when design requirements necessitate different current ratings or thermal characteristics while maintaining the same voltage class and diode configuration.

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)	30	A
Voltage - Forward (Vf) (Max) @ If	820 mV @ 30 A	—
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction	-55 to 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 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 minimum
Mounting Type: Through Hole (for direct mechanical substitution)
Package / Case: TO-220-3 (for direct board-level substitution)

Current Rating Considerations:

Current - Average Rectified (Io): Parts rated at 30 A are direct parametric equivalents
Parts rated below 30 A (15 A, 7.5 A) are functional alternatives for lower-current applications but represent downrated selections
Parts rated above 30 A are not provided in the substitute list

Packaging Alternatives:

TO-220-3 packages are mechanically interchangeable for through-hole mounting
TO-247-3 packages represent alternative through-hole formats with different thermal and mechanical characteristics
TO-263-3 (D2PAK) represents a surface-mount alternative with different board integration requirements

Compliance and Regulatory Status:

ROHS3 compliance is maintained across all active substitute parts
Moisture Sensitivity Level 1 (Unlimited) is consistent across all listed alternatives
REACH status varies; parts marked "REACH Unaffected" or "REACH info available upon request" are acceptable for unrestricted use

Substitutes are grouped into three categories: Parametric Equivalents (matching all electrical specifications), Direct Manufacturers (same part number from different manufacturers), and Similar Parts (matching voltage and configuration with different current ratings or packages).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If	Speed	Package / Case	Mounting Type	Product Status	RoHS Status
MBR3045CT	Taiwan Semiconductor Corporation	45	30	820 mV @ 30 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Active	ROHS3 Compliant
MBR3045PT	Solid State Inc.	45	30	—	Fast Recovery ≤500 ns	TO-247-3	Through Hole	Active	ROHS3 Compliant
25CTQ045	Vishay General Semiconductor - Diodes Division	45	15	560 mV @ 15 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Obsolete	RoHS non-compliant
MBR3045CT	Good-Ark Semiconductor	45	30 mA	—	Small Signal ≤200 mA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MBR3045CTP	Diodes Incorporated	45	15	650 mV @ 15 A	Fast Recovery ≤500 ns	TO-220-3 Isolated Tab	Through Hole	Obsolete	ROHS3 Compliant
30CTQ045	Diotec Semiconductor	45	15	620 mV @ 15 A	Fast Recovery ≤500 ns	TO-263-3, D2PAK	Surface Mount	Active	ROHS3 Compliant
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	7.5	570 mV @ 7.5 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Active	ROHS3 Compliant
MBR2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	15	820 mV @ 30 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Active	ROHS3 Compliant
MBR2545CTG	onsemi	45	15	620 mV @ 15 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Active	ROHS3 Compliant
MBR2550CT	Diodes Incorporated	50	15	750 mV @ 15 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Obsolete	ROHS3 Compliant
MBR3045CT-BP	Micro Commercial Co	45	15	700 mV @ 15 A	Fast Recovery ≤500 ns	TO-220-3	Through Hole	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent - Preferred for Direct Substitution:

MBR3045PT (Solid State Inc.) is the primary parametric equivalent, matching the 45 V / 30 A specifications of the MBR3045CT. This part is currently active in production and ROHS3 compliant. The primary difference is packaging format: TO-247-3 instead of TO-220-3. Selection of this part is appropriate when board layout accommodates the TO-247 footprint and when the alternative thermal characteristics of the larger package are acceptable or beneficial.

Direct Manufacturer Alternatives - Same Part Number, Different Manufacturers:

MBR3045CT from Good-Ark Semiconductor carries the same part number but differs significantly in current rating (30 mA versus 30 A). This part is not suitable as a substitute for the primary MBR3045CT and represents a different product category despite identical nomenclature.

Active Production Alternatives - 15 A Current Rating:

MBR3045CT-BP (Micro Commercial Co), MBR2545CTG (onsemi), and MBR2545CT-E3/45 (Vishay) are all currently active in production, ROHS3 compliant, and rated for 45 V / 15 A operation in TO-220-3 packages. These parts are suitable for applications where the required current does not exceed 15 A. MBR2545CTG is part of the SWITCHMODE™ series and offers the widest operating temperature range (-65°C to 175°C).

Lower Current Alternatives - 7.5 A Rating:

MBR1545CT-E3/45 (Vishay) is currently active and rated for 45 V / 7.5 A in TO-220-3 packaging. This part is appropriate for applications with significantly reduced current requirements and offers an extended operating temperature range (-65°C to 175°C).

Obsolete Parts - Not Recommended for New Designs:

25CTQ045 (Vishay), MBR3045CTP (Diodes Incorporated), and MBR2550CT (Diodes Incorporated) are marked as obsolete. 25CTQ045 additionally carries RoHS non-compliance status. These parts should not be selected for new designs or long-term production applications.

Surface Mount Alternative:

30CTQ045 (Diotec Semiconductor) provides a 45 V / 15 A Schottky diode array in TO-263-3 (D2PAK) surface-mount packaging. This part is currently active and ROHS3 compliant. Selection is appropriate only when surface-mount technology is required and board layout supports the D2PAK footprint.

Frequently Asked Questions (FAQ)

Q: Can MBR3045PT (TO-247-3) be used as a direct replacement for MBR3045CT (TO-220-3)?

A: MBR3045PT is a parametric equivalent with identical electrical specifications (45 V, 30 A, Schottky technology, fast recovery). However, the TO-247-3 package has different mechanical dimensions and pin spacing than TO-220-3. Direct board-level substitution requires PCB footprint modification. The TO-247 package typically offers superior thermal performance due to larger tab area.

Q: What is the difference between MBR3045CT from Taiwan Semiconductor Corporation and MBR3045CT from Good-Ark Semiconductor?

A: Despite identical part numbers, these are distinct products. The Taiwan Semiconductor version is rated 45 V / 30 A with fast recovery characteristics. The Good-Ark version is rated 45 V / 30 mA with small-signal speed characteristics. These parts serve different applications and are not interchangeable.

Q: Can a 15 A rated part (MBR2545CTG, MBR3045CT-BP) replace the 30 A MBR3045CT?

A: A 15 A rated part can replace the MBR3045CT only in applications where the actual current requirement does not exceed 15 A. The 15 A parts are downrated selections and will not safely handle 30 A operation. Verify actual circuit current requirements before selecting a lower-rated substitute.

Q: Why is 25CTQ045 listed as a substitute if it is obsolete and RoHS non-compliant?

A: 25CTQ045 is included in the substitute list because it was originally specified as an alternative in the MBR3045CT documentation. However, obsolete status and RoHS non-compliance make this part unsuitable for new designs or production applications. This part should be avoided in favor of active, compliant alternatives.

Q: Is MBR3045CTP with isolated tab (ITO-220S) compatible with standard TO-220-3 footprints?

A: MBR3045CTP uses the ITO-220S package, which features an isolated tab. While the lead spacing matches TO-220-3, the isolated tab design creates electrical differences. This part is obsolete and should not be selected for new applications.

Q: Can 30CTQ045 (surface mount, TO-263-3) be used in a through-hole design?

A: No. 30CTQ045 is a surface-mount component in D2PAK (TO-263-3) packaging. It cannot be directly installed in through-hole PCB designs. Surface-mount components require different assembly processes and board layouts. This part is suitable only for surface-mount applications.

Q: What are the key compliance differences between substitute parts?

A: All active substitute parts listed (MBR3045PT, MBR3045CT-BP, MBR2545CTG, MBR2545CT-E3/45, MBR1545CT-E3/45, 30CTQ045) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity. Obsolete parts (25CTQ045, MBR3045CTP, MBR2550CT) have varying compliance status. REACH status is "REACH Unaffected" or "Vendor Undefined" for most parts. Verify specific regulatory requirements for your application before final part selection.

Q: Which substitute offers the widest operating temperature range?

A: MBR2545CTG (onsemi) and 30CTQ045 (Diotec) both support -65°C to 175°C operating temperature range, which is wider than the primary MBR3045CT specification of -55°C to 150°C. MBR1545CT-E3/45 also supports -65°C to 175°C. These parts are suitable for applications requiring extended temperature operation.

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