MBR3045STG Equivalent & Substitute Parts

Part Overview

The MBR3045STG is a Schottky diode array manufactured by onsemi in the SWITCHMODE™ series. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 format and operates across a junction temperature range of -65°C to 175°C.

The MBR3045STG is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute components must maintain electrical compatibility while meeting current manufacturing and compliance standards.

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	620 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3

Substitute Part Grouping Explanation

Substitution of the MBR3045STG is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode (mandatory)
Technology: Schottky (mandatory)
Voltage - DC Reverse (Vr) (Max): 45 V (mandatory)
Current - Average Rectified (Io) (per Diode): 15 A (mandatory)
Mounting Type: Through Hole (mandatory)
Package / Case: TO-220-3 (mandatory)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: 620 mV @ 15 A (reference baseline)
Current - Reverse Leakage @ Vr: 200 µA @ 45 V (reference baseline)
Operating Temperature - Junction: -65°C ~ 175°C (reference baseline)

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical and Mechanical Specifications): Parts that match all primary criteria and maintain electrical performance within the reference baseline parameters.

Parametric Equivalents (Matching Primary Criteria with Acceptable Variations): Parts that satisfy all primary substitution criteria but may exhibit variations in forward voltage, reverse leakage current, or operating temperature range. These variations remain within acceptable engineering tolerances for the application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Mounting	Product Status
MBR3045STG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Through Hole	Obsolete
DSA20C45PB	IXYS	45 V	10 A	750 mV @ 10 A	200 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Through Hole	Active
DSA30C45PB	IXYS	45 V	15 A	750 mV @ 15 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Through Hole	Active
DSB30C45PB	IXYS	45 V	15 A	590 mV @ 15 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Through Hole	Active
DSB60C45PB	IXYS	45 V	30 A	630 mV @ 30 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Through Hole	Active
STPS3045CT	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	-40°C ~ 200°C	TO-220-3	Through Hole	Active
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	-40°C ~ 150°C	TO-220-3	Through Hole	Active
VS-30CTQ045-M3	Vishay General Semiconductor - Diodes Division	45 V	30 A	760 mV @ 30 A	2 mA @ 45 V	-55°C ~ 175°C	TO-220-3	Through Hole	Active
30CTQ045	Diotec Semiconductor	45 V	15 A	620 mV @ 15 A	50 µA @ 45 V	-50°C ~ 175°C	TO-263-3, D2PAK	Surface Mount	Active
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Through Hole	Active

Engineering Selection Recommendations

Direct Equivalent for Through-Hole Applications:

The MBR2545CTG (onsemi, SWITCHMODE™ series) is the primary direct equivalent. This part maintains identical electrical specifications to the MBR3045STG, including 45 V reverse voltage, 15 A average rectified current, 620 mV forward voltage at 15 A, and 200 µA reverse leakage at 45 V. Both components operate across -65°C to 175°C and are packaged in TO-220-3 Through Hole format. The MBR2545CTG is currently Active in product status and carries ROHS3 compliance certification.

Primary Active Substitute (Matched Electrical Performance):

The STPS3045CT (STMicroelectronics) provides equivalent electrical performance with 45 V reverse voltage, 15 A average rectified current, and 200 µA reverse leakage at 45 V. Forward voltage is 570 mV at 15 A, which is lower than the reference baseline. Operating temperature range extends to 200°C maximum junction temperature. This part is Active in product status and ROHS3 compliant. High inventory availability (38,369 units) supports production continuity.

Alternative Substitutes (Parametric Equivalents):

The DSA30C45PB (IXYS) and DSB30C45PB (IXYS) both satisfy the 45 V, 15 A primary criteria in TO-220-3 Through Hole packaging. DSA30C45PB exhibits 750 mV forward voltage at 15 A with 300 µA reverse leakage. DSB30C45PB provides improved forward voltage performance at 590 mV with significantly reduced reverse leakage at 10 mA. Both are Active products with ROHS3 compliance.

Higher Current Capability Option:

The DSB60C45PB (IXYS) and VS-30CTQ045-M3 (Vishay) provide 30 A average rectified current capability while maintaining 45 V reverse voltage rating and TO-220-3 Through Hole packaging. These components support applications requiring increased current capacity beyond the original 15 A specification.

Surface Mount Alternative:

The 30CTQ045 (Diotec Semiconductor) provides parametric equivalence with identical 45 V, 15 A, and 620 mV specifications but in Surface Mount TO-263-3 (D2PAK) packaging. This option is suitable for redesigned PCB layouts requiring surface mount technology.

Compliance and Availability:

All recommended substitutes carry ROHS3 compliance certification and REACH Unaffected status, meeting current regulatory requirements. All substitute parts are classified as Active in product status, ensuring long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the DSA20C45PB substitute for the MBR3045STG?

A: The DSA20C45PB is not a direct substitute. While it maintains the 45 V reverse voltage rating and TO-220-3 Through Hole packaging, the average rectified current is rated at 10 A per diode, which is below the original 15 A specification. This part is suitable only for applications with reduced current requirements.

Q: What is the difference between the STPS3045CT and MBR2545CTG?

A: Both parts meet the primary substitution criteria of 45 V, 15 A, TO-220-3 Through Hole configuration. The STPS3045CT (STMicroelectronics) offers lower forward voltage at 570 mV versus 620 mV and extends maximum junction temperature to 200°C. The MBR2545CTG (onsemi) maintains the original operating temperature range of -65°C to 175°C and is from the same manufacturer series as the obsolete MBR3045STG.

Q: Is the 30CTQ045 compatible with the original MBR3045STG application?

A: The 30CTQ045 provides electrical equivalence with matching 45 V, 15 A, and 620 mV specifications. However, it is packaged in Surface Mount TO-263-3 (D2PAK) format rather than Through Hole TO-220-3. This part requires PCB redesign and is suitable only for new designs or board-level rework incorporating surface mount technology.

Q: Why do some substitutes have higher current ratings than 15 A?

A: Parts such as DSB60C45PB (30 A) and VS-30CTQ045-M3 (30 A) provide higher current capability while maintaining the 45 V reverse voltage and TO-220-3 packaging. These components are suitable for applications requiring increased current capacity and are backward compatible with designs originally specified for 15 A operation.

Q: What is the significance of reverse leakage current variations among substitutes?

A: Reverse leakage current affects power dissipation and thermal performance in standby conditions. The MBR3045STG baseline is 200 µA at 45 V. Substitutes with lower leakage (such as 30CTQ045 at 50 µA) reduce standby power consumption. Substitutes with higher leakage (such as STPS40L45CT at 600 µA) increase standby dissipation and require thermal evaluation in the target application.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts carry ROHS3 compliance certification. The original MBR3045STG does not specify RoHS status. All active substitutes meet current environmental and regulatory requirements for new production applications.

Q: What is the operating temperature range consideration for substitution?

A: The MBR3045STG operates from -65°C to 175°C junction temperature. Most IXYS substitutes operate from -55°C to 175°C, providing a narrower lower temperature range. The STPS3045CT extends to 200°C maximum. Applications requiring operation below -55°C must use the MBR2545CTG or verify thermal performance in the target environment.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage variations between substitutes range from 530 mV (STPS40L45CT at 20 A) to 760 mV (VS-30CTQ045-M3 at 30 A). In rectifier applications, these differences affect voltage drop and power dissipation. Applications with tight voltage regulation requirements must evaluate forward voltage performance at the specified operating current.

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