MBR4045CT-1 Equivalent & Substitute Parts

Part Overview

The MBR4045CT-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 and 20 A average rectified current per diode. The device is packaged in a TO-262-3 (I2PAK) through-hole format with long leads.

The MBR4045CT-1 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support. Substitute components must maintain electrical compatibility while meeting current manufacturing and compliance standards.

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)	20	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Operating Temperature - Junction	-65 to 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 MBR4045CT-1 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Package / Case: TO-262-3 Long Leads, I2PAK, TO-262AA
Mounting Type: Through Hole

Current Rating Consideration: The MBR4045CT-1 is rated for 20 A average rectified current per diode. Substitute parts may have equal or lower current ratings. Parts with lower current ratings are suitable for applications where the circuit design does not require the full 20 A capacity.

Electrical Performance Parameters: Forward voltage (Vf), reverse leakage current, and operating temperature range may vary between substitute parts. These variations are acceptable provided the substitute part meets or exceeds the electrical requirements of the target application.

Compliance Status: The MBR4045CT-1 is RoHS non-compliant. Substitute parts with RoHS3 compliance are available and represent current manufacturing standards.

Parameter Comparison

Parameter	MBR4045CT-1 (Vishay)	MBRB3045CT-1G (onsemi)	STPS1545CR (STMicroelectronics)
Manufacturer	Vishay General Semiconductor	onsemi	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	15 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 20 A	620 mV @ 15 A	570 mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V	200 µA @ 45 V	100 µA @ 45 V
Operating Temperature - Junction	-65 to 150 °C	-65 to 175 °C	Max 175 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA
Product Status	Obsolete	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MBRB3045CT-1G (onsemi): This substitute part maintains the 45 V reverse voltage rating and shares the identical TO-262-3 I2PAK package configuration. The current rating is reduced from 20 A to 15 A. This part is suitable for applications where the circuit design accommodates a 15 A maximum current per diode. The MBRB3045CT-1G is ROHS3 compliant and represents current manufacturing standards. Product status is obsolete; however, inventory availability is reported at 1900 pieces.

STPS1545CR (STMicroelectronics): This substitute part maintains the 45 V reverse voltage rating and shares the identical TO-262-3 I2PAK package configuration. The current rating is reduced from 20 A to 7.5 A. This part is suitable for applications where the circuit design accommodates a 7.5 A maximum current per diode. The STPS1545CR is ROHS3 compliant and carries an active product status, indicating ongoing manufacturer support and availability. Inventory availability is reported at 3300 pieces. Forward voltage performance is superior at 570 mV @ 7.5 A compared to the original 600 mV @ 20 A specification.

Selection Criteria: Choose MBRB3045CT-1G when the application requires current capacity between 15 A and 20 A per diode. Choose STPS1545CR when the application requires current capacity of 7.5 A or less per diode, or when active product status and long-term availability are required.

Frequently Asked Questions (FAQ)

Q: Can the MBRB3045CT-1G or STPS1545CR be used as direct replacements for the MBR4045CT-1?

A: Both parts are electrically compatible substitutes provided the circuit design accommodates the reduced current ratings. The MBRB3045CT-1G supports 15 A per diode, and the STPS1545CR supports 7.5 A per diode. If the original circuit requires the full 20 A capacity, neither substitute is appropriate. Verify the actual current requirements of your application before selection.

Q: Are the package dimensions identical between these three parts?

A: Yes. All three parts use the TO-262-3 Long Leads, I2PAK, TO-262AA package configuration. Physical mounting and PCB layout compatibility is maintained across all three parts.

Q: What is the difference in forward voltage performance between these parts?

A: The MBR4045CT-1 specifies 600 mV @ 20 A. The MBRB3045CT-1G specifies 620 mV @ 15 A. The STPS1545CR specifies 570 mV @ 7.5 A. Forward voltage specifications are measured at their respective rated currents and are not directly comparable across different current levels. Consult the manufacturer datasheets for forward voltage characteristics across the full operating current range.

Q: What is the significance of RoHS compliance status?

A: The MBR4045CT-1 is RoHS non-compliant. Both substitute parts (MBRB3045CT-1G and STPS1545CR) are ROHS3 compliant. RoHS3 compliance indicates the parts meet current environmental and material restriction standards. For new designs and applications subject to RoHS regulations, the compliant substitutes are required.

Q: Why does the STPS1545CR have lower reverse leakage current than the MBR4045CT-1?

A: The STPS1545CR specifies 100 µA @ 45 V reverse leakage, compared to 1 mA @ 45 V for the MBR4045CT-1. Lower reverse leakage current is a characteristic of modern Schottky diode manufacturing processes and represents improved device performance. This difference does not affect substitution compatibility.

Q: Is the STPS1545CR recommended over the MBRB3045CT-1G?

A: Selection depends on current requirements. The STPS1545CR is recommended when active product status and long-term manufacturer support are priorities, or when the application current requirement is 7.5 A or less. The MBRB3045CT-1G is appropriate when 15 A capacity is required. Both parts are electrically compatible with the MBR4045CT-1 within their respective current ratings.

Q: Can these parts be used in parallel to achieve higher current capacity?

A: Parallel operation of Schottky diodes requires careful circuit design and is outside the scope of this substitution reference. Consult the manufacturer datasheets and application notes for guidance on parallel diode configurations.

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