MBR1545CT/45 Equivalent & Substitute Parts

Part Overview

The MBR1545CT/45 is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 7.5 A average rectified current per diode. This component is packaged in a Through Hole TO-220-3 case and features fast recovery characteristics suitable for high-frequency rectification applications.

The MBR1545CT/45 is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical specifications and active product status, ensuring design continuity and supply chain reliability.

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)	7.5	A
Voltage - Forward (Vf) (Max) @ If	570	mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the MBR1545CT/45 is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-220-3

Allowable Variation Parameters:

Current - Average Rectified (Io): Equal to or greater than 7.5 A
Voltage - Forward (Vf): Equal to or less than 570 mV at rated current
Current - Reverse Leakage @ Vr: Equal to or less than 100 µA at 45 V
Operating Temperature - Junction: Range must encompass or exceed -65°C to 175°C

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

Direct Manufacturer Equivalent: Identical electrical and mechanical specifications with improved product status or packaging.

Manufacturer Recommended Substitute: Enhanced current rating or performance characteristics while maintaining core voltage and configuration requirements.

Parametric Equivalent: Identical electrical performance from alternative manufacturer with active product status.

Parameter Comparison

Parameter	MBR1545CT/45 (Main)	MBR1545CT-E3/45	MBR2045CT-BP	MBRP1545NTU	STPS1545CT
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Micro Commercial Co	Fairchild Semiconductor	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	7.5 A	7.5 A	20 A	15 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 7.5 A	570 mV @ 7.5 A	Not Specified	800 mV @ 15 A	570 mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	1 mA @ 45 V	100 µA @ 45 V
Operating Temperature - Junction	-65 to 175 °C	-65 to 175 °C	-55 to 150 °C	-65 to 150 °C	Max 175 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	Non-compliant	ROHS3 Compliant	Not Specified	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

MBR1545CT-E3/45 (Direct Manufacturer Equivalent)

This part is the primary recommended substitute. It is manufactured by Vishay General Semiconductor, the original manufacturer of the MBR1545CT/45, and maintains identical electrical specifications and TO-220-3 packaging. The MBR1545CT-E3/45 carries Active product status and ROHS3 compliance, addressing obsolescence concerns while preserving design compatibility. Inventory availability is substantial at 3990 units.

STPS1545CT (Parametric Equivalent)

The STPS1545CT from STMicroelectronics provides identical electrical performance to the original part, including 45 V reverse voltage, 7.5 A current rating, and 570 mV forward voltage. This part is Active, ROHS3 compliant, and available in TO-220-3 packaging. It serves as a cross-manufacturer alternative with 1143 units in stock.

MBR2045CT-BP (Enhanced Current Rating)

The MBR2045CT-BP from Micro Commercial Co offers a higher current rating of 20 A per diode while maintaining the 45 V reverse voltage specification and TO-220-3 package. This part is suitable for applications requiring increased current capacity within the same voltage class. Operating temperature range is -55°C to 150°C, which is narrower than the original specification.

MBRP1545NTU (Intermediate Current Rating)

The MBRP1545NTU from Fairchild Semiconductor provides a 15 A current rating, positioned between the original 7.5 A and the MBR2045CT-BP 20 A option. This part maintains 45 V reverse voltage and TO-220-3 packaging. Forward voltage is specified at 800 mV @ 15 A, and reverse leakage is 1 mA @ 45 V, both higher than the original part. Operating temperature range is -65°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can the MBR1545CT-E3/45 be used as a direct replacement for the MBR1545CT/45?

A: Yes. The MBR1545CT-E3/45 is a direct equivalent with identical electrical specifications, diode configuration, and TO-220-3 packaging. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. Non-compliant).

Q: What is the difference between the MBR1545CT-E3/45 and STPS1545CT?

A: Both parts provide identical electrical performance at 45 V, 7.5 A, and 570 mV forward voltage. The primary difference is manufacturer: Vishay General Semiconductor versus STMicroelectronics. Both are Active and ROHS3 compliant. Selection may be based on supply chain preference or inventory availability.

Q: Can I use the MBR2045CT-BP as a substitute if my circuit only requires 7.5 A?

A: The MBR2045CT-BP is electrically compatible with the MBR1545CT/45 in terms of voltage rating and package. The higher 20 A current rating does not create incompatibility in circuits designed for 7.5 A operation. However, the operating temperature range is narrower (-55°C to 150°C versus -65°C to 175°C), which may be a limiting factor in extreme temperature applications.

Q: What are the key differences between the MBRP1545NTU and the original MBR1545CT/45?

A: The MBRP1545NTU has a higher current rating (15 A versus 7.5 A), higher forward voltage (800 mV @ 15 A versus 570 mV @ 7.5 A), and higher reverse leakage (1 mA @ 45 V versus 100 µA @ 45 V). The operating temperature range is -65°C to 150°C, which is 25°C lower at the maximum than the original part.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All substitute parts listed are packaged in TO-220-3 Through Hole configuration, ensuring mechanical and thermal compatibility with the original MBR1545CT/45 in PCB layouts and heat sink applications.

Q: Which substitute part has the best RoHS compliance status?

A: Both the MBR1545CT-E3/45 and STPS1545CT are ROHS3 compliant. The MBR1545CT/45 is RoHS non-compliant. If RoHS compliance is a design requirement, either of these two parts is suitable.

Q: Can I use a higher current-rated part like the MBR2045CT-BP in a circuit designed for 7.5 A?

A: Yes. A higher current-rated diode operates within its safe operating region when used in a circuit requiring lower current. The diode will not be stressed. However, verify that the operating temperature range of the substitute part (-55°C to 150°C for MBR2045CT-BP) meets your application requirements, as it is narrower than the original specification.

Q: What is the significance of the "Fast Recovery" specification?

A: Fast Recovery ≤ 500ns indicates the diode's switching speed capability. All listed substitute parts maintain this specification, ensuring compatibility in high-frequency rectification applications where the original MBR1545CT/45 was used.

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