MBRS1545CT Equivalent & Substitute Parts

Part Overview

The MBRS1545CT is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common cathode with 45V reverse voltage rating and 15A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount 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 diversification, or when design requirements necessitate different electrical characteristics within the same functional category. Substitute selection must maintain compatibility with the TO-263-3 package footprint and preserve the 45V voltage rating and 1 pair common cathode configuration.

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)	15	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the MBRS1545CT is based on the following critical parameters that must be maintained or exceeded:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode (electrical topology requirement)
Technology: Schottky (switching characteristics and forward voltage profile)
Voltage - DC Reverse (Vr) (Max): 45V minimum (voltage rating must not be lower)
Mounting Type: Surface Mount (PCB assembly compatibility)
Package / Case: TO-263-3, D2PAK (physical footprint compatibility)

Current Rating Considerations:

Current - Average Rectified (Io): Substitute parts rated at 15A or higher are functionally equivalent
Parts rated below 15A (such as 7.5A or 10A variants) are acceptable only in applications where the circuit current demand does not exceed the substitute part's rating

Electrical Performance Parameters:

Voltage - Forward (Vf): Lower forward voltage is beneficial and does not restrict substitution
Current - Reverse Leakage @ Vr: Higher leakage is acceptable within normal operating margins
Operating Temperature - Junction: Extended temperature ranges provide additional design margin

Compliance and Certification:

RoHS3 compliance is maintained across all active substitute parts
Moisture Sensitivity Level (MSL) 1 is consistent across all candidates

Substitute parts are grouped into three categories: direct equivalents (matching all critical parameters), current-rated equivalents (15A or higher), and lower-current variants (7.5A to 12.5A) suitable for reduced-current applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	RoHS
MBRS1545CT	Taiwan Semiconductor Corporation	45 V	15 A	840 mV @ 15 A	100 µA @ 45 V	-55 to 150°C	TO-263-3, D2PAK	Active	ROHS3
MBRB1545	SMC Diode Solutions	45 V	15 A	700 mV @ 15 A	1 mA @ 45 V	-55 to 150°C	TO-263-3, D2PAK	Active	ROHS3
MBRB1545CT	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	840 mV @ 7.5 A	100 µA @ 45 V	-65 to 150°C	TO-263-3, D2PAK	Obsolete	Non-compliant
MBRB2545CTT4G	onsemi	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	-65 to 175°C	TO-263-3, D2PAK	Active	ROHS3
MBRB3045CT-1G	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65 to 175°C	TO-262-3, I2PAK (Through Hole)	Obsolete	ROHS3
NRVBB40L45CTT4G	onsemi	45 V	20 A	500 mV @ 20 A	1.2 mA @ 45 V	-65 to 175°C	TO-263-3, D2PAK	Active	ROHS3
SBRB2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65 to 175°C	TO-263-3, D2PAK	Obsolete	ROHS3
STPS1545CG-TR	STMicroelectronics	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	-55 to 175°C	TO-263-3, D2PAK	Active	ROHS3
STPS2045CG-TR	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	-55 to 175°C	TO-263-3, D2PAK	Active	ROHS3
STPS20L45CG-TR	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	-55 to 150°C	TO-263-3, D2PAK	Active	ROHS3
STPS2545CG-TR	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	-55 to 175°C	TO-263-3, D2PAK	Active	ROHS3

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

MBRB1545 (SMC Diode Solutions) is the primary direct equivalent to MBRS1545CT. Both parts maintain identical voltage rating (45V), current rating (15A), diode configuration (1 pair common cathode), and package (TO-263-3, D2PAK). MBRB1545 is in active product status with ROHS3 compliance. The forward voltage is lower (700 mV vs. 840 mV), which represents improved performance characteristics. This part is suitable for direct substitution in all applications.

Secondary Equivalent (Full Electrical Match):

MBRB2545CTT4G (onsemi) provides full electrical equivalence with 45V rating and 15A current per diode in TO-263-3 D2PAK package. This part is in active status with ROHS3 compliance and extended operating temperature range (-65 to 175°C). Forward voltage is 820 mV @ 30A, which is comparable to the main part. This part is suitable for direct substitution.

Higher Current Capability:

NRVBB40L45CTT4G (onsemi) exceeds the current rating at 20A per diode while maintaining 45V voltage rating and TO-263-3 D2PAK package. This part is in active status with ROHS3 compliance and includes AEC-Q101 automotive qualification. The forward voltage is significantly lower (500 mV @ 20A), indicating superior performance. This part is suitable for applications requiring higher current capacity or automotive-grade reliability.

Reduced Current Variants (For Lower-Current Applications Only):

STPS1545CG-TR (STMicroelectronics) and STPS2045CG-TR (STMicroelectronics) are rated at 7.5A and 10A respectively. These parts maintain 45V voltage rating and TO-263-3 D2PAK package in active status with ROHS3 compliance. These parts are suitable only for applications where circuit current does not exceed their respective ratings.

STPS2545CG-TR (STMicroelectronics) is rated at 12.5A, providing intermediate current capacity. This part is in active status with ROHS3 compliance and extended temperature range. This part is suitable for applications requiring 12.5A or less.

Obsolete Parts (Not Recommended for New Designs):

MBRB1545CT (Vishay), SBRB2545CTG (onsemi), and MBRB3045CT-1G (onsemi) are marked as obsolete. MBRB1545CT is additionally non-compliant with RoHS requirements. MBRB3045CT-1G uses through-hole I2PAK package, incompatible with surface mount TO-263-3 footprints. These parts are not recommended for new designs or long-term supply commitments.

Frequently Asked Questions (FAQ)

Q: Can STPS1545CG-TR replace MBRS1545CT in all applications?

A: STPS1545CG-TR is rated at 7.5A per diode, compared to MBRS1545CT's 15A rating. This part is suitable only for applications where the circuit current does not exceed 7.5A per diode. If the application requires 15A operation, this part is not a suitable replacement.

Q: What is the difference between MBRB1545 and MBRB2545CTT4G?

A: Both parts are rated at 45V and 15A in TO-263-3 D2PAK package. MBRB1545 (SMC Diode Solutions) operates from -55 to 150°C with 700 mV forward voltage. MBRB2545CTT4G (onsemi) operates from -65 to 175°C with 820 mV forward voltage @ 30A. MBRB2545CTT4G provides extended temperature range, while MBRB1545 provides lower forward voltage at the specified 15A condition.

Q: Is NRVBB40L45CTT4G a direct replacement for MBRS1545CT?

A: NRVBB40L45CTT4G is electrically compatible with MBRS1545CT in terms of voltage rating (45V), diode configuration (1 pair common cathode), and package (TO-263-3 D2PAK). However, NRVBB40L45CTT4G is rated at 20A per diode, exceeding the 15A requirement. This part is suitable for direct replacement and provides additional current capacity margin. NRVBB40L45CTT4G includes AEC-Q101 automotive qualification, which may be beneficial for automotive applications.

Q: Why is MBRB3045CT-1G not recommended as a substitute?

A: MBRB3045CT-1G uses TO-262-3 I2PAK through-hole package, which is physically incompatible with the TO-263-3 D2PAK surface mount footprint of MBRS1545CT. Additionally, this part is marked as obsolete, making it unsuitable for new designs or long-term supply commitments.

Q: Can I use STPS2545CG-TR if my application requires 15A?

A: STPS2545CG-TR is rated at 12.5A per diode, which is below the 15A requirement. This part is not suitable for applications requiring 15A operation. Use MBRB1545, MBRB2545CTT4G, or NRVBB40L45CTT4G for 15A or higher current requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. MBRB1545CT (Vishay) is marked as RoHS non-compliant and is obsolete. All other active parts maintain ROHS3 compliance status.

Q: What is the significance of the forward voltage difference between MBRS1545CT (840 mV) and MBRB1545 (700 mV)?

A: Lower forward voltage indicates reduced power dissipation at the same current level. MBRB1545's 700 mV forward voltage results in lower heat generation compared to MBRS1545CT's 840 mV. This represents improved efficiency and is not a limitation for substitution. The lower forward voltage is a beneficial characteristic.

Q: Can STPS20L45CG-TR be used as a substitute?

A: STPS20L45CG-TR is rated at 10A per diode, which is below the 15A requirement of MBRS1545CT. This part is suitable only for applications where circuit current does not exceed 10A per diode. For 15A applications, use MBRB1545, MBRB2545CTT4G, or NRVBB40L45CTT4G.

Q: What packaging options are available for 45V 15A Schottky diode arrays?

A: All active substitute parts rated at 15A or higher use TO-263-3 D2PAK surface mount package, which is compatible with MBRS1545CT. MBRB3045CT-1G uses TO-262-3 I2PAK through-hole package but is obsolete. For new designs, TO-263-3 D2PAK is the standard package for this device category.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message