MBR3045CT-Y Equivalent & Substitute Parts

Part Overview

The MBR3045CT-Y is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as a 1 Pair Common Cathode device rated for 45 V DC reverse voltage and 30 A average rectified current per diode. The component is packaged in TO-220-3 through-hole format and maintains active product status with ROHS3 compliance.

Substitute parts become necessary when the MBR3045CT-Y reaches end-of-life status, when inventory constraints occur, or when alternative manufacturers' components meet the electrical and mechanical specifications required for the application. The parts listed below satisfy the core electrical parameters and package requirements that define functional equivalence for this diode array category.

Substiute Parts

MBR3045CT-Y

Taiwan Semiconductor CorporationIn Stock: 1148MBR3045CT-Y Datasheet

Current PartRFQ

25CTQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 943625CTQ045 Datasheet

DirectRFQ

MBR3045CT

Good-Ark SemiconductorIn Stock: 17921MBR3045CT Datasheet

DirectRFQ

MBR3045CTP

Diodes IncorporatedIn Stock: 2270MBR3045CTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the MBR3045CT-Y is determined by the following critical parameters:

Electrical Equivalence Criteria:

• Diode Configuration: 1 Pair Common Cathode (pinout compatibility)
• Technology: Schottky (switching characteristics and forward voltage behavior)
• Voltage - DC Reverse (Vr) (Max): 45 V (minimum voltage rating requirement)
• Current - Average Rectified (Io) (per Diode): 30 A (current handling capacity)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (transient response)

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole (PCB assembly compatibility)
• Package / Case: TO-220-3 (physical form factor and thermal characteristics)

The substitute parts identified below satisfy the core electrical parameters (45 V reverse voltage, Schottky technology, 1 Pair Common Cathode configuration) and mechanical requirements (TO-220-3 through-hole package). Parts with reduced current ratings (15 A instead of 30 A) are listed as substitutes only when all other parameters align, with the understanding that current derating represents a functional limitation in specific applications.

Parameter Comparison

Engineering Selection Recommendations

Active Product Status Preference: The MBR3045CT manufactured by Good-Ark Semiconductor maintains active product status and ROHS3 compliance, aligning with the main part's lifecycle and regulatory standing. However, the MBR3045CT is rated for 30 mA average rectified current, which represents a significant current derating compared to the 30 A specification of the MBR3045CT-Y. This part is suitable only for applications where current requirements do not exceed 30 mA.

Obsolete Product Consideration: The 25CTQ045 (Vishay) and MBR3045CTP (Diodes Incorporated) are classified as obsolete products. The 25CTQ045 carries RoHS non-compliance status, which may conflict with regulatory requirements in certain applications. The MBR3045CTP maintains ROHS3 compliance and REACH Affected status, with a TO-220-3 Isolated Tab package variant that differs mechanically from the standard TO-220-3 form factor.

Current Rating Alignment: Both the 25CTQ045 and MBR3045CTP are rated for 15 A average rectified current, representing a 50% reduction from the MBR3045CT-Y specification. These parts are functionally equivalent only in applications where the circuit design accommodates the reduced current capacity.

Compliance and Regulatory Status: For applications requiring ROHS3 compliance, the MBR3045CT (Good-Ark) and MBR3045CTP (Diodes Incorporated) satisfy this requirement. The 25CTQ045 does not meet ROHS3 compliance standards and should not be selected for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 25CTQ045 directly replace the MBR3045CT-Y?

A: The 25CTQ045 shares the same 45 V reverse voltage rating, Schottky technology, 1 Pair Common Cathode configuration, and TO-220-3 package. However, it is rated for 15 A average rectified current compared to the MBR3045CT-Y's 30 A rating. Additionally, the 25CTQ045 is classified as obsolete and does not meet ROHS3 compliance. Direct replacement is not recommended for applications requiring the full 30 A current capacity or ROHS3 compliance.

Q: What is the significance of the TO-220-3 Isolated Tab package variant used in the MBR3045CTP?

A: The TO-220-3 Isolated Tab (ITO-220S) package provides electrical isolation between the mounting tab and the diode circuit, preventing direct thermal coupling to ground or other circuit nodes through the mounting surface. This differs from the standard TO-220-3 package where the tab is electrically connected to one of the diode terminals. Component selection must account for this mechanical and electrical difference in PCB layout and thermal management design.

Q: Is the MBR3045CT (Good-Ark) suitable as a substitute for high-current applications?

A: No. The MBR3045CT is rated for 30 mA average rectified current, which is three orders of magnitude below the MBR3045CT-Y specification of 30 A. This part is classified as a small-signal device and is not suitable for applications requiring the 30 A current capacity of the main part.

Q: What are the reverse leakage current differences among the substitute parts?

A: The MBR3045CT-Y specifies 200 µA reverse leakage at 45 V. The 25CTQ045 exhibits 1.75 mA reverse leakage (8.75 times higher), while the MBR3045CT exhibits 200 nA reverse leakage (1000 times lower). The MBR3045CTP matches the main part at 200 µA. Higher reverse leakage increases power dissipation in standby conditions and may affect circuit performance in precision applications.

Q: Are all substitute parts available in the same packaging format?

A: The MBR3045CT-Y, 25CTQ045, and MBR3045CT are all available in standard TO-220-3 through-hole packages. The MBR3045CTP uses a TO-220-3 Isolated Tab variant (ITO-220S), which requires different PCB footprint and mounting considerations. Mechanical compatibility must be verified before component selection.

Q: What is the forward voltage difference between the main part and substitutes?

A: The MBR3045CT-Y specifies 820 mV forward voltage at 30 A. The 25CTQ045 specifies 560 mV at 15 A, and the MBR3045CTP specifies 650 mV at 15 A. Forward voltage varies with current; direct comparison at different current levels requires reference to manufacturer datasheets. The MBR3045CT does not provide forward voltage specification in the available data.

Q: Which substitute part best matches the MBR3045CT-Y for active product applications?

A: The MBR3045CT (Good-Ark Semiconductor) maintains active product status and ROHS3 compliance. However, its 30 mA current rating does not match the 30 A specification of the main part. Among the listed substitutes, no part maintains both active status and full 30 A current capacity. The MBR3045CTP offers the closest electrical match (15 A, 45 V, Schottky, 1 Pair Common Cathode) but is classified as obsolete.