MBRB2545CTT4 Equivalent & Substitute Parts

Part Overview

The MBRB2545CTT4 is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is housed in a TO-263-3 D2PAK surface mount package and is part of the SWITCHMODE™ series. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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	820 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MBRB2545CTT4 is determined by strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

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 greater
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts from the same manufacturer (onsemi) with identical electrical specifications and packaging, differing only in product status or packaging format.

Similar Manufacturer Parts: Parts from alternative manufacturers (STMicroelectronics, IXYS, Vishay) that meet or exceed the electrical specifications and share the same package type. These parts may have variations in forward voltage, reverse leakage current, or operating temperature range within acceptable limits.

Parametric Equivalents: Parts with identical electrical and mechanical specifications but different packaging formats (Tube vs. Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Max)	Package	Product Status	RoHS Status
MBRB2545CTT4	onsemi	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	175°C	TO-263-3, D2PAK	Obsolete	RoHS non-compliant
MBRB2545CTT4G	onsemi	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	175°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS3045CG-TR	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	200°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS3045CGY-TR	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	200°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS30L45CG-TR	STMicroelectronics	45 V	15 A	550 mV @ 15 A	400 µA @ 45 V	150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS2545CGY-TR	STMicroelectronics	45 V	12.5 A	840 mV @ 25 A	125 µA @ 45 V	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	150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
VS-MBRB2545CTL-M3	Vishay General Semiconductor - Diodes Division	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant
VS-MBRB2545CT-M3	Vishay General Semiconductor - Diodes Division	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	150°C	TO-263-3, D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MBRB2545CTT4G

The MBRB2545CTT4G is the direct equivalent from onsemi with identical electrical specifications to the obsolete MBRB2545CTT4. This part maintains the same forward voltage characteristics (820 mV @ 30 A), reverse leakage current (200 µA @ 45 V), and operating temperature range (-65°C ~ 175°C). The primary distinction is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant). This part is recommended for designs requiring exact electrical performance matching and maximum inventory availability (53,514 pcs in stock).

Secondary Recommendations: STPS3045CG-TR and STPS3045CGY-TR

Both STMicroelectronics parts meet the core electrical requirements with 45 V reverse voltage and 15 A current rating. These parts offer improved forward voltage characteristics (570 mV @ 15 A vs. 820 mV @ 30 A) and extended maximum junction temperature (200°C vs. 175°C). The STPS3045CGY-TR variant includes automotive qualification (AEC-Q101) and is available in higher quantity (19,257 pcs). These parts are suitable for applications where lower forward voltage drop and higher temperature operation are beneficial.

Alternative Consideration: STPS30L45CG-TR

This STMicroelectronics part provides the lowest forward voltage (550 mV @ 15 A) among all substitutes, making it advantageous for efficiency-critical applications. However, the maximum junction temperature is limited to 150°C and reverse leakage current is elevated (400 µA @ 45 V). This part is suitable only for applications where thermal management is not a constraint.

Vishay Options: VS-MBRB2545CTL-M3 and VS-MBRB2545CT-M3

Both Vishay parts provide electrical equivalence to the original MBRB2545CTT4 with identical forward voltage and reverse leakage specifications. The primary difference is packaging format: VS-MBRB2545CTL-M3 is supplied in Tape & Reel format, while VS-MBRB2545CT-M3 is supplied in Tube format. Maximum junction temperature is 150°C. These parts are suitable for designs requiring exact electrical matching with alternative supplier qualification.

Not Recommended: STPS2545CGY-TR

While this part shares the 45 V reverse voltage rating and TO-263-3 D2PAK package, the current rating is reduced to 12.5 A per diode. This part is suitable only for applications with lower current requirements and should not be used as a direct substitute for 15 A designs.

Not Recommended: DSSK28-0045BS-TRL

Although this IXYS part meets the voltage and current specifications, the reverse leakage current is significantly elevated (20 mA @ 45 V vs. 200 µA @ 45 V). This characteristic makes it unsuitable for applications sensitive to leakage current performance.

Frequently Asked Questions (FAQ)

Q: Can MBRB2545CTT4G be used as a direct replacement for MBRB2545CTT4?

A: Yes. MBRB2545CTT4G is the direct equivalent with identical electrical specifications, diode configuration, and package type. The part is currently in active production status with full RoHS3 compliance.

Q: What is the difference between STPS3045CG-TR and STPS3045CGY-TR?

A: Both parts have identical electrical specifications and package type. STPS3045CGY-TR includes automotive qualification (AEC-Q101) and is available in significantly higher quantity. Selection depends on application requirements for automotive certification.

Q: Why is STPS2545CGY-TR listed as a substitute if the current rating is only 12.5 A?

A: STPS2545CGY-TR is not a suitable substitute for applications requiring 15 A per diode operation. This part is listed in the original substitute list but should be used only in designs with reduced current requirements.

Q: What are the key differences between forward voltage specifications across substitute parts?

A: Forward voltage varies significantly across substitutes. MBRB2545CTT4 and Vishay parts specify 820 mV @ 30 A. STMicroelectronics STPS3045 variants specify 570 mV @ 15 A. STPS30L45CG-TR specifies 550 mV @ 15 A. Lower forward voltage reduces power dissipation but specifications are measured at different current levels, requiring careful application analysis.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 Compliant. The original MBRB2545CTT4 is RoHS non-compliant. MBRB2545CTT4G provides the same electrical performance with RoHS3 compliance.

Q: What is the significance of the maximum junction temperature differences?

A: Maximum junction temperature ratings vary from 150°C to 200°C across substitutes. MBRB2545CTT4 and MBRB2545CTT4G are rated to 175°C. STPS3045 variants are rated to 200°C, providing higher thermal margin. STPS30L45CG-TR and Vishay parts are rated to 150°C, requiring more conservative thermal design.

Q: Can parts with different reverse leakage currents be interchanged?

A: Reverse leakage current differences must be evaluated based on application requirements. MBRB2545CTT4, MBRB2545CTT4G, STPS3045 variants, and Vishay parts specify 200 µA @ 45 V. STPS30L45CG-TR specifies 400 µA @ 45 V. DSSK28-0045BS-TRL specifies 20 mA @ 45 V. Applications sensitive to leakage current performance require careful selection.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube. All parts use the same TO-263-3 D2PAK surface mount package. Packaging format selection depends on manufacturing process and inventory management requirements.

Q: Is automotive qualification available for substitute parts?

A: Yes. STPS3045CGY-TR and STPS2545CGY-TR include automotive qualification (AEC-Q101). Other substitutes do not carry automotive certification. Selection of automotive-qualified parts is required for automotive applications.

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