MBR30L45CT Equivalent & Substitute Parts

Part Overview

The MBR30L45CT 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 configuration and is currently in active product status with RoHS3 compliance.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are required for supply chain continuity, or when design specifications permit operation within the electrical and mechanical parameters of alternative devices. This reference provides direct equivalents and similar alternatives based on matching or compatible electrical characteristics and package configurations.

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	550 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400 µA @ 45 V	—
Operating Temperature - Junction	-55°C 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 MBR30L45CT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: Must be 1 Pair Common Cathode
Technology: Must be Schottky
Voltage - DC Reverse (Vr) (Max): Must be ≥ 45 V
Current - Average Rectified (Io) (per Diode): Must be ≥ 30 A for direct equivalence; lower ratings indicate reduced current capacity
Speed: Must support Fast Recovery ≤ 500ns for > 200mA (Io) operation

Mechanical Compatibility Requirements:

Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-3 or compatible variant (TO-220-3 Isolated Tab acceptable with design consideration)

Regulatory & Environmental Requirements:

RoHS Status: RoHS3 Compliant preferred for new designs
Moisture Sensitivity Level (MSL): Must be 1 (Unlimited) or equivalent

Substitute parts are categorized as follows:

Direct Equivalents: Parts matching all critical electrical parameters (45 V, 30 A, Schottky, Common Cathode, Fast Recovery) in TO-220-3 packaging.

Functional Alternatives: Parts with reduced current ratings (15 A, 10 A, 7.5 A) or slightly different voltage ratings (50 V) that maintain the same diode configuration, technology, and package type. These are suitable for applications where the full 30 A rating is not required.

Similar Parts: Parts with comparable electrical characteristics but from different manufacturers, offering supply chain alternatives while maintaining functional compatibility within specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA/mA]	Tj (°C)	Package	Product Status	RoHS
MBR30L45CT	Taiwan Semiconductor Corporation	45	30	550 @ 15 A	Fast Recovery ≤ 500ns	400 µA @ 45 V	-55 to 150	TO-220-3	Active	RoHS3
25CTQ045	Vishay General Semiconductor - Diodes Division	45	15	560 @ 15 A	Fast Recovery ≤ 500ns	1.75 mA @ 45 V	-55 to 150	TO-220-3	Obsolete	Non-compliant
MBR3045CT	Good-Ark Semiconductor	45	0.03	—	Small Signal ≤ 200mA	200 nA @ 45 V	—	TO-220-3	Active	RoHS3
MBR3045CTP	Diodes Incorporated	45	15	650 @ 15 A	Fast Recovery ≤ 500ns	200 µA @ 45 V	-65 to 150	TO-220-3 Isolated Tab	Obsolete	RoHS3
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	7.5	570 @ 7.5 A	Fast Recovery ≤ 500ns	100 µA @ 45 V	-65 to 175	TO-220-3	Active	RoHS3
MBR1545CTG	onsemi	45	7.5	840 @ 15 A	Fast Recovery ≤ 500ns	100 µA @ 45 V	-65 to 175	TO-220-3	Active	RoHS3
MBR2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	15	820 @ 30 A	Fast Recovery ≤ 500ns	200 µA @ 45 V	-65 to 150	TO-220-3	Active	RoHS3
MBR2545CTG	onsemi	45	15	620 @ 15 A	Fast Recovery ≤ 500ns	200 µA @ 45 V	-65 to 175	TO-220-3	Active	RoHS3
MBR2550CT	Diodes Incorporated	50	15	750 @ 15 A	Fast Recovery ≤ 500ns	1 mA @ 50 V	-65 to 150	TO-220-3	Obsolete	RoHS3
MBR3045CT-BP	Micro Commercial Co	45	15	700 @ 15 A	Fast Recovery ≤ 500ns	200 µA @ 45 V	-55 to 150	TO-220-3	Active	RoHS3
VT2045C-M3/4W	Vishay General Semiconductor - Diodes Division	45	10	580 @ 10 A	Fast Recovery ≤ 500ns	2 mA @ 45 V	-40 to 150	TO-220-3	Active	RoHS3

Engineering Selection Recommendations

For Direct Replacement (30 A Rating Required):

No direct equivalent with identical 30 A rating and all matching parameters is available in the provided substitute list. The MBR30L45CT remains the primary selection for applications requiring the full 30 A average rectified current specification.

For 15 A Applications:

The following active, RoHS3-compliant parts are suitable substitutes when application requirements permit 15 A operation:

MBR2545CTG (onsemi): Active product status, RoHS3 compliant, operating temperature range -65°C to 175°C, forward voltage 620 mV @ 15 A. Recommended for new designs requiring supply chain alternatives.
MBR2545CT-E3/45 (Vishay General Semiconductor - Diodes Division): Active product status, RoHS3 compliant, operating temperature range -65°C to 150°C, forward voltage 820 mV @ 30 A.
MBR3045CT-BP (Micro Commercial Co): Active product status, RoHS3 compliant, operating temperature range -55°C to 150°C, forward voltage 700 mV @ 15 A.

For 10 A Applications:

VT2045C-M3/4W (Vishay General Semiconductor - Diodes Division): Active product status, RoHS3 compliant, automotive-grade with AEC-Q101 qualification, operating temperature range -40°C to 150°C.

For 7.5 A Applications:

MBR1545CTG (onsemi): Active product status, RoHS3 compliant, operating temperature range -65°C to 175°C.
MBR1545CT-E3/45 (Vishay General Semiconductor - Diodes Division): Active product status, RoHS3 compliant, operating temperature range -65°C to 175°C.

Obsolete Parts (Not Recommended for New Designs):

The following parts are listed as obsolete and should not be selected for new designs: 25CTQ045, MBR3045CTP, MBR2550CT.

Voltage Rating Consideration:

MBR2550CT provides 50 V reverse voltage rating compared to the 45 V rating of MBR30L45CT. This higher voltage rating is compatible with 45 V applications but is obsolete and non-recommended.

Frequently Asked Questions (FAQ)

Q: Can I use a 15 A rated part as a direct replacement for the MBR30L45CT in a 30 A application?

A: No. The MBR30L45CT is rated for 30 A average rectified current per diode. Substituting a 15 A rated part in an application requiring 30 A operation will result in device overstress and potential failure. Current rating substitution is only permissible when the application design permits reduced current capacity.

Q: What is the difference between the MBR2545CTG and MBR2545CT-E3/45?

A: Both parts are 45 V, 15 A Schottky diode arrays in TO-220-3 packaging with RoHS3 compliance and active product status. The MBR2545CTG is manufactured by onsemi with operating temperature range -65°C to 175°C and forward voltage 620 mV @ 15 A. The MBR2545CT-E3/45 is manufactured by Vishay with operating temperature range -65°C to 150°C and forward voltage 820 mV @ 30 A. Selection depends on thermal requirements and acceptable forward voltage drop for the specific application.

Q: Is the MBR3045CT (30 mA) a suitable substitute for the MBR30L45CT (30 A)?

A: No. The MBR3045CT is rated for 30 milliamps (0.03 A) average rectified current, which is significantly lower than the 30 amperes rating of the MBR30L45CT. This part is not suitable for applications requiring the full current capacity of the primary device.

Q: Can I use a part with a higher voltage rating, such as the MBR2550CT (50 V), in place of the MBR30L45CT (45 V)?

A: Yes, from an electrical standpoint. A 50 V rated device is compatible with 45 V applications. However, the MBR2550CT is obsolete and not recommended for new designs. If a higher voltage rating is required, select an active product with equivalent or superior current rating.

Q: What does "TO-220-3 Isolated Tab" mean, and is it compatible with standard TO-220-3?

A: The TO-220-3 Isolated Tab variant (ITO-220S package) features electrical isolation between the tab and the semiconductor junction, preventing direct thermal coupling to the mounting surface. While mechanically similar to standard TO-220-3, the isolated tab configuration requires specific mounting considerations. Substitution between standard TO-220-3 and isolated tab variants requires design review to confirm thermal and electrical compatibility.

Q: Why are some substitute parts listed as "Obsolete"?

A: Obsolete parts are no longer in active production and have limited availability. While they may still be in inventory at some distributors, they are not recommended for new designs due to supply chain uncertainty and lack of ongoing manufacturer support. Active product alternatives should be prioritized.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. For new designs, RoHS3-compliant parts are required in most markets. Parts marked as "RoHS non-compliant" or "REACH Affected" may face regulatory restrictions depending on application and market.

Q: Can I substitute a part with a lower reverse leakage current?

A: Yes. Lower reverse leakage current is generally beneficial and indicates improved device quality. For example, the MBR3045CT has reverse leakage of 200 nA @ 45 V compared to 400 µA @ 45 V for the MBR30L45CT. However, ensure all other electrical parameters (voltage, current, speed) meet application requirements before selecting based on leakage current alone.

Q: What is the difference between "Fast Recovery" and "Small Signal" speed classifications?

A: Fast Recovery (≤ 500ns for > 200mA) indicates the diode is optimized for switching applications with high current levels and requires fast reverse recovery time. Small Signal (≤ 200mA) indicates the diode is designed for low-current applications and does not specify fast recovery characteristics. These are not interchangeable; selection depends on application current levels and switching frequency requirements.

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