MBR2545CT Equivalent & Substitute Parts

Part Overview

The MBR2545CT is a Schottky diode array manufactured by onsemi in the SWITCHMODE™ series. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 30 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format with fast recovery characteristics suitable for high-frequency switching applications.

The MBR2545CT is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array 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 ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction	−65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR2545CT is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-220-3

Performance Parameters:

Current - Average Rectified (Io) (per Diode): 30 A (primary specification)
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 to 175°C

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all mandatory compatibility parameters and maintaining the 30 A current rating with equivalent or superior electrical characteristics.

Similar Substitutes: Parts meeting mandatory compatibility parameters but with reduced current ratings (15 A or lower) or different package variants. These require circuit-level evaluation to confirm suitability for the intended application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Tj (Min-Max) [°C]	Package	Product Status	RoHS Status
MBR2545CT	onsemi	45	30	820 @ 30 A	200 @ 45 V	−65 to 175	TO-220-3	Obsolete	Non-compliant
MBR2545CTG	onsemi	45	15	620 @ 15 A	200 @ 45 V	−65 to 175	TO-220-3	Active	ROHS3 Compliant
25CTQ045	Vishay General Semiconductor - Diodes Division	45	15	560 @ 15 A	1750 @ 45 V	−55 to 150	TO-220-3	Obsolete	Non-compliant
MBR3045CT	Good-Ark Semiconductor	45	0.03	—	0.0002 @ 45 V	—	TO-220-3	Active	ROHS3 Compliant
MBR3045CTP	Diodes Incorporated	45	15	650 @ 15 A	200 @ 45 V	−65 to 150	TO-220-3 Isolated Tab	Obsolete	ROHS3 Compliant
SBR3045CT	Diodes Incorporated	45	15	550 @ 15 A	500 @ 45 V	−65 to 150	TO-220-3	Active	ROHS3 Compliant
30CTQ045	Diotec Semiconductor	45	15	620 @ 15 A	50 @ 45 V	−50 to 175	TO-263-3 (Surface Mount)	Active	ROHS3 Compliant
DSA20C45PB	IXYS	45	10	750 @ 10 A	200 @ 45 V	−55 to 175	TO-220-3	Active	ROHS3 Compliant
DSA30C45PB	IXYS	45	15	750 @ 15 A	300 @ 45 V	−55 to 175	TO-220-3	Active	ROHS3 Compliant
DSB30C45PB	IXYS	45	15	590 @ 15 A	10000 @ 45 V	−55 to 150	TO-220-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Active Product Status Preference: MBR2545CTG (onsemi) is the recommended primary substitute. This part maintains the onsemi SWITCHMODE™ series lineage, is actively manufactured, and carries ROHS3 compliance certification. The 15 A current rating represents a reduction from the original 30 A specification and requires circuit-level verification for applications demanding the full 30 A capacity.

Alternative Active Substitutes with TO-220-3 Through-Hole Packaging:

SBR3045CT (Diodes Incorporated): Active status, ROHS3 compliant, Super Barrier technology, 15 A rating, 550 mV forward voltage at 15 A
DSA30C45PB (IXYS): Active status, ROHS3 compliant, 15 A rating, extended operating temperature range (−55°C to 175°C)
DSB30C45PB (IXYS): Active status, ROHS3 compliant, 15 A rating, 590 mV forward voltage at 15 A

Surface Mount Alternative: 30CTQ045 (Diotec Semiconductor) provides an active, ROHS3-compliant option in TO-263-3 (D2PAK) surface mount packaging. This part is suitable only for applications where surface mount technology is acceptable and through-hole mounting is not required.

Compliance Considerations: All recommended active substitutes carry ROHS3 compliance certification, addressing regulatory requirements that the original MBR2545CT (RoHS non-compliant) does not meet. Applications subject to RoHS directives must transition to compliant alternatives.

Current Rating Limitations: No direct substitute maintaining the full 30 A rating in TO-220-3 through-hole packaging is available among active products. Applications requiring 30 A operation must either retain existing MBR2545CT inventory or evaluate alternative diode array architectures with higher current capacity.

Frequently Asked Questions (FAQ)

Q: Can MBR2545CTG directly replace MBR2545CT in all applications?

A: MBR2545CTG is electrically compatible in terms of voltage rating (45 V), diode configuration (1 Pair Common Cathode), technology (Schottky), and package (TO-220-3). However, the current rating is reduced from 30 A to 15 A. Direct replacement is valid only for applications where the circuit current demand does not exceed 15 A per diode. Circuits designed for 30 A operation require redesign or alternative component selection.

Q: What is the difference between Schottky and Super Barrier technology in these diodes?

A: Both technologies are provided in the input data. SBR3045CT uses Super Barrier technology while most other substitutes use Schottky technology. The input data does not provide detailed technical differentiation between these technologies. Component selection should be based on the electrical parameters provided: forward voltage, reverse leakage, and current rating.

Q: Why is MBR3045CT listed as a substitute if it has only 30 mA current rating?

A: MBR3045CT appears in the provided substitute list but is not suitable for applications requiring the 30 A capacity of the original MBR2545CT. The 30 mA rating represents a significant reduction and indicates this part is applicable only to low-current signal-level applications. This part should not be selected for power rectification applications.

Q: Are there any through-hole TO-220-3 substitutes with 30 A rating currently in active production?

A: No active production parts with 30 A rating in TO-220-3 through-hole packaging are listed in the provided substitute data. All active alternatives in this package format are rated at 15 A or lower. Applications requiring 30 A operation must evaluate alternative package formats or diode array configurations not included in this reference.

Q: What does "Isolated Tab" mean in the MBR3045CTP package designation?

A: MBR3045CTP is specified with TO-220-3 Isolated Tab packaging. This indicates the tab (thermal connection) is electrically isolated from the diode circuit, differing from standard TO-220-3 where the tab may be connected to one of the circuit nodes. This feature affects thermal management and circuit layout considerations.

Q: Should I select a substitute based on lower forward voltage (Vf)?

A: Forward voltage is a provided electrical parameter that affects power dissipation and circuit efficiency. Lower forward voltage reduces heat generation. However, substitute selection must first satisfy mandatory compatibility parameters (voltage rating, current rating, configuration, package). Among compatible alternatives, lower forward voltage may be advantageous for efficiency-critical applications, but this is a secondary selection criterion.

Q: Why do some substitutes have higher reverse leakage current?

A: Reverse leakage current is a provided electrical parameter that varies by manufacturer and technology. Higher reverse leakage increases standby power consumption and heat generation. The original MBR2545CT specifies 200 µA at 45 V. Substitutes with higher leakage (such as DSB30C45PB at 10 mA) may require circuit-level evaluation if leakage-sensitive applications are involved.

Q: Can I use 30CTQ045 (TO-263 surface mount) as a substitute in a through-hole design?

A: 30CTQ045 uses TO-263-3 (D2PAK) surface mount packaging, which is fundamentally different from the TO-220-3 through-hole package of the original MBR2545CT. Direct board-level substitution is not possible without PCB redesign and rework. This part is applicable only to new designs or boards modified to accommodate surface mount components.

Q: What is the significance of the operating temperature range difference between substitutes?

A: The original MBR2545CT operates from −65°C to 175°C. Some substitutes have narrower ranges (e.g., −55°C to 150°C). Applications operating at the temperature extremes of the original specification may not be compatible with substitutes having reduced temperature ranges. Verify that the substitute's operating temperature range encompasses the application's thermal environment.

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