MBR2045CTU Equivalent & Substitute Parts

Part Overview

The MBR2045CTU is a Schottky diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode device rated for 45 V DC reverse voltage. This component is packaged in a Through Hole TO-220-3 format and is currently in Active product status with 726 units in stock.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within alternative electrical specifications. The MBR2045CTU has documented equivalent alternatives that maintain core functional compatibility while offering variations in current rating, voltage rating, and thermal characteristics.

Substiute Parts

MBR2045CTU

SMC Diode SolutionsIn Stock: 760MBR2045CTU Datasheet

Current PartRFQ

MBR2545CTG

onsemiIn Stock: 15334MBR2545CTG Datasheet

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MBR2550CT

Diodes IncorporatedIn Stock: 3201MBR2550CT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MBR2045CTU is determined by the following critical parameters:

Primary Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode (must match exactly)
• Technology: Schottky (must match exactly)
• Mounting Type: Through Hole (must match exactly)
• Package / Case: TO-220-3 (must match exactly)

Secondary Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V or higher
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (must match exactly)
• Operating Temperature Range: Must encompass or exceed -55°C ~ 150°C

Regulatory Compliance:

• RoHS3 Compliant status required
• ECCN: EAR99 classification

The identified substitute parts MBR2545CTG and MBR2550CT satisfy these core criteria while introducing variations in current rating and voltage rating that remain within acceptable design margins for applications where the MBR2045CTU serves as the primary component.

Parameter Comparison

Engineering Selection Recommendations

MBR2545CTG (onsemi): This substitute maintains identical voltage rating (45 V) and package configuration (TO-220-3) as the MBR2045CTU. The MBR2545CTG is manufactured by onsemi under the SWITCHMODE™ series and carries Active product status. This part offers superior reverse leakage characteristics (200 µA @ 45 V versus 1 mA @ 45 V) and an extended upper operating temperature limit (175°C versus 150°C). The MBR2545CTG is ROHS3 Compliant and carries REACH Unaffected status. Inventory availability is significantly higher at 15,312 units. This substitute is suitable for applications where the MBR2045CTU experiences supply constraints.

MBR2550CT (Diodes Incorporated): This substitute carries Obsolete product status and is not recommended for new designs or long-term supply assurance. While the MBR2550CT maintains the required TO-220-3 package and Schottky technology, its obsolete classification indicates discontinued manufacturing and declining inventory support. The part is ROHS3 Compliant and REACH Affected. The elevated voltage rating (50 V versus 45 V) provides additional design margin but does not offset the product lifecycle disadvantage. Use of this substitute is limited to legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can the MBR2545CTG directly replace the MBR2045CTU in existing designs?

A: The MBR2545CTG maintains identical diode configuration (1 Pair Common Cathode), technology (Schottky), mounting type (Through Hole), and package format (TO-220-3). Both parts operate within the same voltage class (45 V). Pin-to-pin compatibility is confirmed. The MBR2545CTG is a direct functional substitute for the MBR2045CTU without circuit modification.

Q: What are the differences in forward voltage characteristics between these parts?

A: The MBR2045CTU specifies 810 mV maximum forward voltage at 20 A. The MBR2545CTG specifies 620 mV maximum forward voltage at 15 A. The MBR2550CT specifies 750 mV maximum forward voltage at 15 A. Forward voltage varies with current level; direct comparison requires evaluation at identical current conditions. For applications operating at 15 A or below, the MBR2545CTG exhibits lower forward voltage drop.

Q: Are there thermal performance differences between the MBR2045CTU and MBR2545CTG?

A: The MBR2045CTU operates across -55°C to 150°C junction temperature range. The MBR2545CTG operates across -65°C to 175°C junction temperature range. The MBR2545CTG provides extended thermal operating margins at both lower and upper temperature extremes. Both parts are packaged in identical TO-220-3 format with equivalent thermal dissipation characteristics.

Q: Why is the MBR2550CT listed as Obsolete?

A: The MBR2550CT carries Obsolete product status, indicating the manufacturer (Diodes Incorporated) has discontinued active production and support. Obsolete components present supply risk and are not suitable for new product designs. Existing inventory may be available through secondary distribution channels, but long-term availability is not assured.

Q: What is the significance of reverse leakage current differences?

A: The MBR2045CTU specifies 1 mA reverse leakage at 45 V. The MBR2545CTG specifies 200 µA reverse leakage at 45 V. Lower reverse leakage current indicates reduced parasitic current flow in reverse bias conditions. The MBR2545CTG exhibits superior reverse leakage performance, which may benefit applications sensitive to standby power consumption or leakage-dependent circuit behavior.

Q: Are all substitute parts RoHS3 Compliant?

A: Yes. The MBR2045CTU, MBR2545CTG, and MBR2550CT are all ROHS3 Compliant. All three parts meet RoHS3 environmental and material restriction requirements. The MBR2545CTG carries REACH Unaffected status, while the MBR2045CTU and MBR2550CT carry REACH Affected status.

Q: What packaging format is used for all listed parts?

A: All three parts—MBR2045CTU, MBR2545CTG, and MBR2550CT—use identical TO-220-3 Through Hole package format. This ensures mechanical and electrical compatibility without requiring PCB layout modifications or mechanical redesign.