MBRB1545CT Equivalent & Substitute Parts

Part Overview

The MBRB1545CT is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with 45 V reverse voltage rating and 7.5 A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount configuration and belongs to the SWITCHMODE™ series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) per Diode	7.5	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 7.5 A	mV
Technology	Schottky	—
Diode Configuration	1 Pair Common Cathode	—
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	100 µA @ 45 V	µA
Operating Temperature - Junction	-65°C ~ 175°C	°C
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRB1545CT is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Diode Configuration: Must be 1 Pair Common Cathode
Technology: Schottky diode technology
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB or compatible variant
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Current - Average Rectified (Io) per Diode: Minimum 7.5 A (higher ratings are acceptable)
Voltage - Forward (Vf): Must not exceed application requirements
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction: Must support application temperature range

Substitute parts are grouped into two categories:

Direct Substitutes (Electrical and Mechanical Equivalence): Parts meeting all primary criteria with identical or superior current ratings and matching electrical characteristics.

Similar Substitutes (Functional Equivalence with Parameter Variations): Parts meeting primary criteria but with variations in current rating, forward voltage, or reverse leakage that remain within acceptable application parameters.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io per Diode [A]	Vf (Max) [mV]	Reverse Leakage [µA]	Tj (Max) [°C]	Package	Status	RoHS
MBRB1545CT	onsemi	45	7.5	570 @ 7.5 A	100 @ 45 V	175	TO-263-3, D2PAK	Obsolete	Non-compliant
STPS1545CG-TR	STMicroelectronics	45	7.5	570 @ 7.5 A	100 @ 45 V	175	TO-263-3, D2PAK	Active	ROHS3 Compliant
12TQ045S	Vishay General Semiconductor - Diodes Division	45	15	560 @ 15 A	1750 @ 45 V	150	TO-263-3, D2PAK	Obsolete	Non-compliant
15CTQ045S	SMC Diode Solutions	45	15	840 @ 15 A	1000 @ 45 V	150	TO-263-3, D2PAK	Active	ROHS3 Compliant
DSA30C45PC-TRL	IXYS	45	15	750 @ 15 A	250 @ 45 V	175	TO-263-3, D2PAK	Active	ROHS3 Compliant
DSSK28-0045BS-TRL	IXYS	45	15	480 @ 15 A	20000 @ 45 V	150	TO-263-3, D2PAK	Active	ROHS3 Compliant
STPS2545CGY-TR	STMicroelectronics	45	12.5	840 @ 25 A	125 @ 45 V	175	TO-263-3, D2PAK	Active	ROHS3 Compliant
SBR10U200CTB	Diodes Incorporated	200	5	820 @ 5 A	200 @ 200 V	175	TO-263-3, D2PAK	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitute - Recommended for Obsolescence Replacement:

STPS1545CG-TR (STMicroelectronics) is the primary direct substitute for MBRB1545CT. This part provides electrical and mechanical equivalence with identical voltage rating (45 V), current rating (7.5 A per diode), forward voltage (570 mV @ 7.5 A), and reverse leakage (100 µA @ 45 V). The part is in active production status and carries ROHS3 compliance, addressing the obsolescence of the original part. Operating temperature range extends to 175°C maximum junction temperature, matching the original specification.

Higher Current Rated Alternatives - For Upgraded Designs:

DSA30C45PC-TRL (IXYS) and STPS2545CGY-TR (STMicroelectronics) provide higher current ratings (15 A and 12.5 A respectively) while maintaining 45 V reverse voltage rating and TO-263-3 D2PAK packaging. Both parts are in active production with ROHS3 compliance. DSA30C45PC-TRL maintains the maximum junction temperature of 175°C. STPS2545CGY-TR includes automotive qualification (AEC-Q101) and operates from -40°C to 175°C. These parts are suitable for applications requiring increased current capacity beyond the original 7.5 A specification.

Alternative with Superior Forward Voltage Characteristics:

DSSK28-0045BS-TRL (IXYS) offers the lowest forward voltage (480 mV @ 15 A) among available substitutes, providing improved efficiency in power conversion applications. This part maintains 45 V reverse voltage rating, 15 A current capacity, and TO-263-3 D2PAK packaging with ROHS3 compliance. Operating temperature range is -55°C to 150°C. The significantly higher reverse leakage (20 mA @ 45 V) must be evaluated against application requirements.

Not Recommended:

SBR10U200CTB (Diodes Incorporated) operates at 200 V reverse voltage with only 5 A current rating and uses Super Barrier technology rather than Schottky. This part is not suitable as a substitute due to voltage and current rating mismatch with the original specification.

12TQ045S (Vishay) is obsolete and provides no advantage over active alternatives despite higher current rating.

Frequently Asked Questions (FAQ)

Q: Can STPS1545CG-TR directly replace MBRB1545CT without circuit modification?

A: Yes. STPS1545CG-TR provides direct electrical and mechanical equivalence. Both parts share identical voltage rating (45 V), current rating (7.5 A per diode), forward voltage (570 mV @ 7.5 A), reverse leakage (100 µA @ 45 V), and package configuration (TO-263-3, D2PAK). No circuit modification is required.

Q: What is the difference between direct substitutes and similar substitutes?

A: Direct substitutes match all electrical parameters and current ratings of the original part. Similar substitutes meet the core voltage and package requirements but may have different current ratings, forward voltage, or reverse leakage characteristics. Similar substitutes require application-level verification to confirm compatibility.

Q: Can I use a 15 A rated part (such as 15CTQ045S or DSA30C45PC-TRL) in place of the 7.5 A MBRB1545CT?

A: Yes, from an electrical standpoint. Higher current-rated parts are backward compatible in applications designed for lower current. However, verify that the forward voltage and reverse leakage characteristics are acceptable for your specific circuit. 15CTQ045S has higher forward voltage (840 mV @ 15 A) compared to the original (570 mV @ 7.5 A), which may affect efficiency. DSA30C45PC-TRL has lower forward voltage (750 mV @ 15 A), providing better efficiency characteristics.

Q: Are all substitute parts RoHS compliant?

A: No. The original MBRB1545CT is RoHS non-compliant. Among active substitutes, STPS1545CG-TR, STPS2545CGY-TR, DSA30C45PC-TRL, DSSK28-0045BS-TRL, and 15CTQ045S are ROHS3 compliant. If RoHS compliance is required for your application, select from these active alternatives.

Q: What is the significance of the D2PAK package designation?

A: D2PAK (also designated TO-263-3 or TO-263AB) is a surface mount package with 2 leads plus a thermal tab. All substitute parts listed use this same package configuration, ensuring mechanical compatibility with existing PCB layouts. No footprint modification is required.

Q: Why does DSSK28-0045BS-TRL have significantly higher reverse leakage (20 mA @ 45 V) compared to other options?

A: Reverse leakage variation is a characteristic difference among Schottky diode manufacturers and process technologies. DSSK28-0045BS-TRL compensates with the lowest forward voltage (480 mV @ 15 A) among available options. Applications sensitive to reverse leakage should select alternatives with lower leakage specifications, such as STPS1545CG-TR (100 µA @ 45 V) or DSA30C45PC-TRL (250 µA @ 45 V).

Q: Is operating temperature range a critical factor in selecting a substitute?

A: Yes, if your application operates at temperature extremes. The original MBRB1545CT operates from -65°C to 175°C. STPS1545CG-TR and DSA30C45PC-TRL maintain this full range. STPS2545CGY-TR operates from -40°C to 175°C, and 15CTQ045S and DSSK28-0045BS-TRL operate from -55°C to 150°C. Verify that the selected substitute meets your application's minimum and maximum junction temperature requirements.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This indicates the diode array contains two diodes sharing a common cathode connection. All substitute parts listed maintain this same configuration, ensuring pin-compatible operation with circuits designed for the original part.

Q: Can STPS2545CGY-TR be used in automotive applications?

A: Yes. STPS2545CGY-TR carries AEC-Q101 automotive qualification and is graded for automotive use. This part is suitable for automotive applications requiring 45 V, 12.5 A Schottky diode arrays in D2PAK packaging.

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