MBR1545CT Equivalent & Substitute Parts

Part Overview

The MBR1545CT 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. Manufactured by onsemi, this component features fast recovery characteristics (≤500 ns) and is housed in a TO-220-3 through-hole package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or replacement applications.

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)	7.5 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A
Speed	Fast Recovery ≤500 ns, >200 mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution of the MBR1545CT is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 7.5 A (minimum)
Package / Case: TO-220-3
Mounting Type: Through Hole
Speed: Fast Recovery ≤500 ns, >200 mA (Io)

Direct Equivalents maintain all primary parameters and are suitable for direct replacement without circuit modification.

Similar Substitutes maintain the core voltage and package specifications but differ in current rating, forward voltage characteristics, or temperature range. These parts are electrically compatible within their specified operating parameters but may require application verification for current-dependent performance.

Parameter Comparison

Part Number	Manufacturer	Diode Configuration	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	RoHS Status
MBR1545CT	onsemi	1 Pair Common Cathode	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Obsolete	RoHS Non-Compliant
MBR1545CTG	onsemi	1 Pair Common Cathode	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	RoHS3 Compliant
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	1 Pair Common Cathode	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	RoHS3 Compliant
STPS1545CT	STMicroelectronics	1 Pair Common Cathode	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	RoHS3 Compliant
SBR1545CT	SMC Diode Solutions	1 Pair Common Cathode	45 V	Not Specified	720 mV @ 7.5 A	1 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	RoHS3 Compliant
MBRP1545NTU	Fairchild Semiconductor	1 Pair Common Cathode	45 V	15 A	800 mV @ 15 A	1 mA @ 45 V	-65°C ~ 150°C	TO-220-3	Active	Not Specified
15CTQ045	SMC Diode Solutions	1 Pair Common Cathode	45 V	15 A	840 mV @ 15 A	1 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	RoHS3 Compliant
DSA20C45PB	IXYS	1 Pair Common Cathode	45 V	10 A	750 mV @ 10 A	200 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active	RoHS3 Compliant
DSA30C45PB	IXYS	1 Pair Common Cathode	45 V	15 A	750 mV @ 15 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active	RoHS3 Compliant
DSB60C45PB	IXYS	1 Pair Common Cathode	45 V	30 A	630 mV @ 30 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	RoHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred):

MBR1545CTG (onsemi) is the direct equivalent to the obsolete MBR1545CT. This part maintains identical electrical specifications including 45 V reverse voltage, 7.5 A average rectified current, and TO-220-3 package configuration. MBR1545CTG is currently active and RoHS3 compliant, making it the primary choice for new designs and direct replacement applications.

Active Equivalents with Identical Specifications:

MBR1545CT-E3/45 (Vishay General Semiconductor - Diodes Division) and STPS1545CT (STMicroelectronics) both maintain the complete electrical parameter set of the original part. Both are active products with RoHS3 compliance. MBR1545CT-E3/45 exhibits lower forward voltage (570 mV @ 7.5 A versus 840 mV @ 15 A), while STPS1545CT provides identical forward voltage characteristics at the same measurement point. Both support the full operating temperature range of -65°C to 175°C.

Higher Current Rated Alternatives:

For applications requiring increased current capacity, MBRP1545NTU (Fairchild Semiconductor), 15CTQ045 (SMC Diode Solutions), DSA30C45PB (IXYS), and DSB60C45PB (IXYS) provide 15 A, 15 A, 15 A, and 30 A ratings respectively, all maintaining 45 V reverse voltage and TO-220-3 packaging. These parts are suitable where the original 7.5 A specification represents a design margin and higher current capacity is beneficial.

Compliance Considerations:

The original MBR1545CT is RoHS non-compliant. All recommended active substitutes are RoHS3 compliant, supporting regulatory requirements for new designs and manufacturing environments with RoHS restrictions.

Frequently Asked Questions (FAQ)

Q: Can MBR1545CTG be used as a direct replacement for the obsolete MBR1545CT?

A: Yes. MBR1545CTG maintains identical electrical and mechanical specifications: 45 V reverse voltage, 7.5 A average rectified current per diode, 1 Pair Common Cathode configuration, and TO-220-3 package. The primary difference is product status (active versus obsolete) and RoHS compliance (RoHS3 compliant versus non-compliant). No circuit modification is required.

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

A: Both parts maintain the core specifications of 45 V reverse voltage, 7.5 A average rectified current, and TO-220-3 packaging. The primary difference is forward voltage: MBR1545CT-E3/45 exhibits 570 mV @ 7.5 A while STPS1545CT also exhibits 570 mV @ 7.5 A. Both support -65°C to 175°C operating temperature range and are RoHS3 compliant. Selection between these parts depends on manufacturer preference and supply chain availability.

Q: Can I use a higher current rated part such as DSA30C45PB (15 A) in place of the 7.5 A MBR1545CT?

A: Yes, from an electrical compatibility standpoint. DSA30C45PB maintains 45 V reverse voltage, 1 Pair Common Cathode configuration, and TO-220-3 packaging. The 15 A rating exceeds the original 7.5 A specification, providing additional current capacity. However, forward voltage differs (750 mV @ 15 A versus 840 mV @ 15 A for the original), which may affect circuit performance in applications sensitive to voltage drop. Verify that the application circuit can accommodate this parameter variation.

Q: What is the significance of the "1 Pair Common Cathode" configuration?

A: This configuration indicates the diode array contains two independent Schottky diodes sharing a common cathode connection. This internal structure determines pin configuration and electrical behavior. Substitutes must maintain this same configuration to ensure pin-to-pin compatibility and proper circuit operation. Parts with different configurations (such as "2 Independent") are not suitable replacements.

Q: Are all recommended substitutes available in the same TO-220-3 package?

A: Yes. All substitute parts listed maintain the TO-220-3 through-hole package specification, ensuring mechanical compatibility with existing PCB layouts and mounting hardware. Packaging variations (such as Tube versus Bulk) affect handling and supply chain logistics but do not impact electrical or mechanical compatibility.

Q: Why do some substitute parts show higher reverse leakage current?

A: Reverse leakage current varies by manufacturer and specific device design. The original MBR1545CT specifies 100 µA @ 45 V. Some substitutes such as DSB60C45PB specify 10 mA @ 45 V. Higher reverse leakage may affect circuit performance in applications with high impedance paths or precision analog circuits. Verify that the application circuit can tolerate the specified reverse leakage of the selected substitute.

Q: What does "RoHS3 Compliant" mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials including lead, cadmium, and mercury. The original MBR1545CT is RoHS non-compliant. All active substitutes are RoHS3 compliant, making them suitable for manufacturing environments and markets with RoHS regulatory requirements. This is a critical consideration for new design qualification and supply chain compliance.

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