MBR3045CT-1 Equivalent & Substitute Parts

Part Overview

The MBR3045CT-1 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 with 15 A average rectified current per diode. The device is packaged in a TO-262-3 Long Leads (I2PAK) through-hole format suitable for high-current rectification applications.

The MBR3045CT-1 carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

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	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBR3045CT-1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: 1 Pair Common Cathode (must match)
Technology: Schottky (must match)
Voltage - DC Reverse (Vr) (Max): 45 V (must equal or exceed)
Current - Average Rectified (Io) (per Diode): 15 A (must equal or exceed)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (must match)

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (must match)
Package / Case: TO-262-3 Long Leads, I2PAK, TO-262AA (must match)

The STPS1545CR from STMicroelectronics meets the core electrical and mechanical compatibility criteria. However, the STPS1545CR is rated for 7.5 A average rectified current per diode, which is below the 15 A requirement of the MBR3045CT-1. This substitute part is suitable only for applications where the actual current demand does not exceed 7.5 A per diode, despite the original design specification of 15 A.

Parameter Comparison

Parameter	MBR3045CT-1 (Vishay)	STPS1545CR (STMicroelectronics)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 30 A	570 mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V	100 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C	175°C (Max)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The STPS1545CR is an active product from STMicroelectronics with ROHS3 compliance, providing improved environmental and regulatory alignment compared to the obsolete, RoHS non-compliant MBR3045CT-1.

Current Rating Consideration: The STPS1545CR is rated for 7.5 A average rectified current per diode, which is 50% of the MBR3045CT-1 specification. Selection of this substitute is appropriate only when the actual application current requirement does not exceed 7.5 A per diode.

Thermal Performance: The STPS1545CR supports a maximum junction temperature of 175°C, compared to the MBR3045CT-1 maximum of 150°C, providing enhanced thermal margin in high-temperature operating environments.

Reverse Leakage: The STPS1545CR exhibits lower reverse leakage current (100 µA @ 45 V) compared to the MBR3045CT-1 (1 mA @ 45 V), resulting in reduced standby power dissipation.

Forward Voltage: The STPS1545CR demonstrates lower forward voltage drop (570 mV @ 7.5 A) relative to the MBR3045CT-1 (760 mV @ 30 A), indicating improved conduction efficiency at rated current levels.

Frequently Asked Questions (FAQ)

Q: Can the STPS1545CR directly replace the MBR3045CT-1 in all applications?

A: The STPS1545CR is mechanically and electrically compatible in terms of package, voltage rating, and diode configuration. However, the current rating difference (7.5 A versus 15 A) requires evaluation of actual application current demands. Direct substitution is valid only when application current does not exceed 7.5 A per diode.

Q: What is the significance of the current rating difference between these parts?

A: The MBR3045CT-1 is rated for 15 A average rectified current per diode, while the STPS1545CR is rated for 7.5 A. This represents a 50% reduction in current capacity. Applications operating at or near the original 15 A specification cannot use the STPS1545CR without risk of thermal stress and component failure.

Q: Are the packages physically identical?

A: Both parts use the TO-262-3 Long Leads package (I2PAK, TO-262AA) with through-hole mounting. Physical footprint and lead configuration are identical, permitting direct PCB mounting without layout modifications.

Q: What are the compliance differences between these parts?

A: The MBR3045CT-1 is RoHS non-compliant and carries Obsolete product status. The STPS1545CR is ROHS3 compliant and maintains Active product status, providing better long-term supply availability and regulatory alignment for new designs.

Q: How do the thermal characteristics compare?

A: The STPS1545CR supports a maximum junction temperature of 175°C, compared to 150°C for the MBR3045CT-1. This 25°C advantage provides additional thermal headroom in elevated-temperature applications.

Q: What is the impact of lower reverse leakage in the STPS1545CR?

A: The STPS1545CR exhibits reverse leakage of 100 µA @ 45 V, compared to 1 mA @ 45 V for the MBR3045CT-1. Lower reverse leakage reduces standby power consumption and heat generation during non-conducting periods, benefiting battery-powered and low-power applications.

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