MBRB3045CT Equivalent & Substitute Parts

Part Overview

The MBRB3045CT is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode in a surface mount TO-263-3 (D2PAK) package. The MBRB3045CT is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBRB3045CT is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 15 A (or higher)
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab)

Acceptable Variation Parameters:

Voltage - Forward (Vf): Variations within typical Schottky diode performance ranges
Current - Reverse Leakage: Variations within acceptable limits for the technology
Operating Temperature Range: Extended ranges are acceptable
RoHS Compliance: Active substitutes must meet current regulatory requirements

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with active product status) and Direct Equivalents (alternative manufacturers meeting core electrical and mechanical requirements).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Tj (Operating)	Package	Product Status	RoHS Status
MBRB3045CT	Vishay	45 V	15 A	760 mV @ 30 A	1 mA @ 45 V	-65°C ~ 150°C	TO-263-3 (D2PAK)	Obsolete	RoHS non-compliant
VS-MBRB3045CTL-M3	Vishay	45 V	15 A	760 mV @ 30 A	1 mA @ 45 V	-55°C ~ 150°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
VS-MBRB3045CTR-M3	Vishay	45 V	15 A	760 mV @ 30 A	1 mA @ 45 V	-55°C ~ 150°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
25CTQ045S	SMC Diode Solutions	45 V	15 A	710 mV @ 15 A	1 mA @ 45 V	-55°C ~ 150°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
30CTQ045S	Diotec Semiconductor	45 V	15 A	620 mV @ 15 A	50 µA @ 45 V	-50°C ~ 175°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
DSSK28-0045BS-TRL	IXYS	45 V	15 A	480 mV @ 15 A	20 mA @ 45 V	-55°C ~ 150°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
MBRB2545CTT4G	onsemi	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	-65°C ~ 175°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
STPS2545CG-TR	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	-40°C ~ 175°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
STPS2545CGY-TR	STMicroelectronics	45 V	12.5 A	840 mV @ 25 A	125 µA @ 45 V	-40°C ~ 175°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant
STPS3045CG-TR	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	-40°C ~ 200°C	TO-263-3 (D2PAK)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

VS-MBRB3045CTL-M3 and VS-MBRB3045CTR-M3 are direct parametric equivalents manufactured by Vishay. Both components maintain identical electrical specifications to the MBRB3045CT while offering active product status and ROHS3 compliance. The primary difference is packaging format: both are supplied in Tape & Reel (TR) configuration. These substitutes are recommended for applications requiring minimal design validation due to electrical parameter equivalence.

Secondary Substitutes (Direct Equivalents):

STPS3045CG-TR (STMicroelectronics), MBRB2545CTT4G (onsemi), 25CTQ045S (SMC Diode Solutions), and 30CTQ045S (Diotec Semiconductor) meet the core electrical and mechanical requirements of 45 V reverse voltage and 15 A average rectified current. All are active products with ROHS3 compliance. These components exhibit variations in forward voltage characteristics and reverse leakage current within acceptable Schottky diode performance ranges. Selection among these alternatives depends on specific application thermal and efficiency requirements.

Limited Current Substitutes:

STPS2545CG-TR and STPS2545CGY-TR are rated for 12.5 A average rectified current, below the 15 A specification of the MBRB3045CT. These components are suitable only for applications where the actual operating current does not exceed 12.5 A per diode. STPS2545CGY-TR includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C ~ 175°C).

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing the non-compliance status of the obsolete MBRB3045CT. Selection should account for application-specific regulatory requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can VS-MBRB3045CTL-M3 or VS-MBRB3045CTR-M3 be used as direct replacements for MBRB3045CT?

A: Yes. Both components are parametric equivalents with identical electrical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance. Packaging format differs (Tape & Reel versus bulk), which may affect procurement and assembly processes but not electrical performance.

Q: What is the difference between VS-MBRB3045CTL-M3 and VS-MBRB3045CTR-M3?

A: Both components are electrically identical with matching specifications. The designation suffix (-L-M3 versus -R-M3) indicates different packaging or tape orientation configurations. Electrical performance and compatibility are equivalent.

Q: Why do some substitutes have lower forward voltage (Vf) specifications?

A: Forward voltage variation is inherent to Schottky diode manufacturing and material selection. Lower Vf values (such as 480 mV in DSSK28-0045BS-TRL) indicate improved efficiency characteristics. Substitutes with lower Vf are acceptable provided they meet the 45 V reverse voltage and 15 A current requirements.

Q: Can STPS2545CG-TR or STPS2545CGY-TR be used in place of MBRB3045CT?

A: These components are rated for 12.5 A average rectified current, not 15 A. They are suitable only if the actual application current does not exceed 12.5 A per diode. Exceeding this rating may result in component failure or reduced reliability.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitutes listed are ROHS3 compliant, addressing regulatory requirements for new designs.

Q: Are there package compatibility concerns when substituting different manufacturers?

A: All listed substitutes use the TO-263-3 (D2PAK) package with identical pinout and thermal characteristics. Package compatibility is maintained across all substitutes. Verify specific supplier device package designations (TO-263AB versus TO-263AA) for PCB footprint compatibility, though both are mechanically equivalent.

Q: Which substitute offers the best thermal performance?

A: STPS3045CG-TR specifies a maximum junction temperature of 200°C, the highest among listed substitutes. This component is suitable for applications requiring extended thermal margin. However, thermal performance also depends on PCB design, thermal management, and actual operating conditions.

Q: Is the operating temperature range difference between substitutes significant?

A: Operating temperature range differences are application-dependent. The MBRB3045CT specifies -65°C ~ 150°C. Substitutes with extended ranges (such as MBRB2545CTT4G at -65°C ~ 175°C or STPS3045CG-TR at -40°C ~ 200°C) provide additional thermal margin for high-temperature applications. For standard industrial applications, differences are typically not critical.

Q: What is the significance of reverse leakage current (Ir) variations?

A: Reverse leakage current affects power dissipation and circuit performance at high temperatures. The MBRB3045CT specifies 1 mA @ 45 V. Substitutes with lower leakage (such as 30CTQ045S at 50 µA) offer improved efficiency. Higher leakage values (such as DSSK28-0045BS-TRL at 20 mA) are acceptable for most applications but may increase standby power consumption.

Q: Are there supply chain advantages to selecting specific substitutes?

A: MBRB2545CTT4G (onsemi) shows significantly higher inventory (53,514 pcs) compared to other substitutes, indicating superior availability. This may provide supply chain advantages for high-volume production. Other substitutes maintain adequate inventory levels (987-2,870 pcs) for standard procurement.

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