MBRB3030CT Equivalent & Substitute Parts

Part Overview

The MBRB3030CT is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with a maximum reverse voltage of 30 V and average rectified current of 15 A per diode. The device is housed in a TO-263-3 D2PAK surface mount package and is part of the SWITCHMODE™ series. The product status is obsolete, making equivalent and substitute parts necessary for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	540 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBRB3030CT is determined by the following critical parameters:

Primary Substitution Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Maximum reverse voltage: 30 V or higher
Average rectified current: 15 A or higher per diode
Package: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Substitute parts are grouped into two categories:

Direct Substitutes (Electrical and Mechanical Equivalence): Parts that match all primary criteria with identical or superior electrical ratings and the same package configuration.

Similar Substitutes (Compatible with Design Considerations): Parts that meet the core functional requirements but may have variations in forward voltage, reverse leakage current, or temperature range that require design verification within the application context.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	RoHS Status
MBRB3030CT	onsemi	30 V	15 A	540 mV @ 15 A	600 µA @ 30 V	-55°C ~ 175°C	TO-263-3, D2PAK	Obsolete	RoHS non-compliant
MBRB2530CT	SMC Diode Solutions	30 V	Not specified	820 mV @ 30 A	1 mA @ 30 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
30CTQ035S	Vishay General Semiconductor - Diodes Division	35 V	15 A	620 mV @ 15 A	2 mA @ 35 V	-55°C ~ 175°C	TO-263-3, D2PAK	Obsolete	RoHS non-compliant
32CTQ030S	SMC Diode Solutions	30 V	15 A	490 mV @ 15 A	1.75 mA @ 30 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
SBLB25L30CTHE3_A/P	Vishay General Semiconductor - Diodes Division	30 V	12.5 A	390 mV @ 12.5 A	900 µA @ 30 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS3030CG-TR	STMicroelectronics	30 V	15 A	490 mV @ 15 A	1 mA @ 30 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS30L30CG-TR	STMicroelectronics	30 V	15 A	460 mV @ 15 A	1.5 mA @ 60 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
VS-25CTQ035S-M3	Vishay General Semiconductor - Diodes Division	35 V	15 A	560 mV @ 15 A	1.75 mA @ 35 V	-55°C ~ 150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Active Product Status with RoHS3 Compliance:

The following parts are recommended as primary substitutes due to active product status and RoHS3 compliance:

32CTQ030S (SMC Diode Solutions): Matches the MBRB3030CT in voltage rating (30 V) and current rating (15 A per diode). Forward voltage is 490 mV @ 15 A, which is lower than the original specification. Operating temperature range is -55°C ~ 150°C. This part provides direct functional equivalence with improved compliance status.
STPS3030CG-TR (STMicroelectronics): Identical electrical specifications to the MBRB3030CT with 30 V reverse voltage and 15 A per diode. Forward voltage is 490 mV @ 15 A. Operating temperature range is -55°C ~ 150°C. Active product status with RoHS3 compliance.
STPS30L30CG-TR (STMicroelectronics): Meets all primary electrical requirements with 30 V reverse voltage and 15 A per diode. Forward voltage is 460 mV @ 15 A, the lowest among active substitutes. Operating temperature range is -55°C ~ 150°C. Active product status with RoHS3 compliance.

For Extended Temperature Range Applications:

30CTQ035S (Vishay General Semiconductor - Diodes Division): Provides extended reverse voltage rating of 35 V with 15 A per diode. Operating temperature range matches the original at -55°C ~ 175°C. Forward voltage is 620 mV @ 15 A. Product status is obsolete; RoHS non-compliant.
VS-25CTQ035S-M3 (Vishay General Semiconductor - Diodes Division): Offers 35 V reverse voltage with 15 A per diode. Forward voltage is 560 mV @ 15 A. Operating temperature range is -55°C ~ 150°C. Active product status with RoHS3 compliance.

For Current-Limited Applications:

SBLB25L30CTHE3_A/P (Vishay General Semiconductor - Diodes Division): Rated for 12.5 A per diode at 30 V reverse voltage. Forward voltage is 390 mV @ 12.5 A. Includes automotive qualification (AEC-Q101). Active product status with RoHS3 compliance.

For Legacy Non-Compliant Designs:

MBRB2530CT (SMC Diode Solutions): Maintains 30 V reverse voltage rating. Forward voltage is 820 mV @ 30 A. Active product status with RoHS3 compliance. Note: Current rating per diode is not specified in available data.

Frequently Asked Questions (FAQ)

Q: Can the 32CTQ030S directly replace the MBRB3030CT?

A: Yes. The 32CTQ030S matches the MBRB3030CT in diode configuration (1 pair common cathode), reverse voltage (30 V), and current rating (15 A per diode). Both use the TO-263-3 D2PAK package. The forward voltage of 490 mV @ 15 A is lower than the original 540 mV @ 15 A, which is acceptable for most applications. The 32CTQ030S is active and RoHS3 compliant.

Q: What is the difference between STPS3030CG-TR and STPS30L30CG-TR?

A: Both parts meet the primary electrical requirements of 30 V reverse voltage and 15 A per diode in the TO-263-3 D2PAK package. The STPS30L30CG-TR has a lower forward voltage (460 mV @ 15 A) compared to the STPS3030CG-TR (490 mV @ 15 A), resulting in lower power dissipation. Both are active products with RoHS3 compliance.

Q: Why is the SBLB25L30CTHE3_A/P listed as a substitute if it has a lower current rating?

A: The SBLB25L30CTHE3_A/P is included as a similar substitute for applications where the 12.5 A per diode rating is sufficient. It offers the lowest forward voltage (390 mV @ 12.5 A) among all listed parts and includes automotive qualification (AEC-Q101). This part is suitable for designs with reduced current requirements.

Q: Are there temperature range considerations when selecting a substitute?

A: Yes. The MBRB3030CT operates from -55°C to 175°C. Most active substitutes (32CTQ030S, STPS3030CG-TR, STPS30L30CG-TR, MBRB2530CT, SBLB25L30CTHE3_A/P) operate from -55°C to 150°C, which is 25°C lower at the maximum junction temperature. For applications requiring the full -55°C to 175°C range, the 30CTQ035S or VS-25CTQ035S-M3 maintain this specification.

Q: What does RoHS3 compliance mean for this product category?

A: RoHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive requirements. Most active substitutes are RoHS3 compliant, while the original MBRB3030CT and 30CTQ035S are RoHS non-compliant. For new designs or procurement requiring regulatory compliance, RoHS3 compliant parts are recommended.

Q: Can I use a 35 V rated diode in place of a 30 V rated diode?

A: Yes. A higher reverse voltage rating (35 V) is compatible with applications designed for 30 V operation. The 30CTQ035S and VS-25CTQ035S-M3 both provide 35 V reverse voltage ratings and can be used in 30 V applications. This provides additional voltage margin without affecting circuit functionality.

Q: What is the significance of forward voltage differences among substitutes?

A: Forward voltage differences affect power dissipation and heat generation in the diode. Lower forward voltage (such as 460 mV in STPS30L30CG-TR) results in less power loss compared to higher forward voltage (such as 820 mV in MBRB2530CT). For high-current applications, selecting a substitute with lower forward voltage reduces thermal stress on the component and surrounding circuitry.

Q: Are all listed substitutes in the same D2PAK package?

A: Yes. All listed parts use the TO-263-3 D2PAK (2 Leads + Tab) TO-263AB package, ensuring mechanical and thermal compatibility with the original MBRB3030CT. No PCB layout modifications are required when substituting between these parts.

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