MBRS1045 Equivalent & Substitute Parts

Part Overview

The MBRS1045 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 45 V DC reverse voltage and 10 A average rectified current in a surface mount TO-263AB (D2PAK) package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified based on matching or exceeding electrical specifications while maintaining package compatibility and mechanical form factor requirements for direct circuit board replacement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 10 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 175	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the MBRS1045 are classified based on the following substitution criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Current - Average Rectified (Io): Must equal or exceed 10 A
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), or TO-263AB
Mounting Type: Must be Surface Mount
Technology: Must be Schottky
RoHS Status: Must be ROHS3 Compliant

Substitution Categories:

Category 1: Direct Electrical Equivalents (Same Voltage and Current Rating) Parts matching 45 V and 10 A specifications with identical or superior electrical performance characteristics.

Category 2: Higher Current Rating (Same Voltage, Higher Current) Parts rated for 45 V with current ratings exceeding 10 A, suitable for applications requiring additional current margin.

Category 3: Obsolete Status Parts (Functional Equivalents) Parts with matching electrical specifications but marked as Obsolete product status, usable only where design revision or long-term supply is not a constraint.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Reverse Leakage [µA @ 45V]	Package	Product Status	RoHS Status
MBRS1045	Taiwan Semiconductor Corporation	45	10	840 @ 10 A	100	TO-263AB (D2PAK)	Active	ROHS3 Compliant
10TQ045S	SMC Diode Solutions	45	10	570 @ 10 A	2000	D2PAK	Active	ROHS3 Compliant
MBRB1045T4G	onsemi	45	10	840 @ 20 A	100	D2PAK	Obsolete	ROHS3 Compliant
SBRB1045G	onsemi	45	10	840 @ 20 A	100	D2PAK	Obsolete	ROHS3 Compliant
STPS745G-TR	STMicroelectronics	45	7.5	840 @ 15 A	100	D2PAK	Active	ROHS3 Compliant
STPS5045SG-TR	STMicroelectronics	45	50	610 @ 50 A	360	D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Active Product Status):

The 10TQ045S (SMC Diode Solutions) is the primary direct substitute for the MBRS1045. Both parts are Active product status, ROHS3 compliant, and rated for 45 V and 10 A. The 10TQ045S exhibits lower forward voltage (570 mV vs. 840 mV @ 10 A), resulting in reduced power dissipation. However, reverse leakage current is significantly higher (2000 µA vs. 100 µA @ 45 V), which may impact applications with stringent leakage requirements.

For Higher Current Applications (Active Product Status):

The STPS5045SG-TR (STMicroelectronics) provides 50 A current rating at 45 V, suitable for designs requiring additional current margin beyond the 10 A specification. This part is Active product status and ROHS3 compliant. Forward voltage is 610 mV @ 50 A, providing improved efficiency characteristics.

For Current-Limited Applications (Active Product Status):

The STPS745G-TR (STMicroelectronics) is rated for 7.5 A at 45 V and is suitable only for applications where the circuit current requirement does not exceed 7.5 A. This part is Active product status and ROHS3 compliant.

For Obsolete Product Replacement Only:

The MBRB1045T4G and SBRB1045G (both onsemi) are marked as Obsolete product status. These parts match the MBRS1045 electrical specifications but should be used only in legacy designs or where supply continuity from existing inventory is required. New designs should not incorporate these parts.

Frequently Asked Questions (FAQ)

Q: Can the 10TQ045S directly replace the MBRS1045 in all applications?

A: The 10TQ045S is electrically compatible for voltage and current ratings. However, the reverse leakage current specification differs significantly (2000 µA vs. 100 µA @ 45 V). Applications sensitive to leakage current, such as precision analog circuits or low-power standby modes, require evaluation of this parameter before substitution.

Q: Why is the STPS745G-TR listed as a substitute if it has lower current rating (7.5 A vs. 10 A)?

A: The STPS745G-TR is included for reference in applications where circuit current does not exceed 7.5 A. It is not a direct substitute for designs requiring the full 10 A capability. This part is listed based on matching voltage rating and package compatibility.

Q: Are the onsemi MBRB1045T4G and SBRB1045G suitable for new designs?

A: Both parts are marked as Obsolete product status. They should not be selected for new designs. These parts are listed for reference only in legacy design updates or where existing inventory must be utilized.

Q: What is the significance of the D2PAK package designation?

A: D2PAK is the mechanical form factor designation for the TO-263-3 package with 2 leads plus a tab. All listed substitute parts use this identical package, ensuring mechanical and thermal compatibility on printed circuit boards designed for the MBRS1045.

Q: Does the STPS5045SG-TR provide better performance than the MBRS1045?

A: The STPS5045SG-TR provides higher current capacity (50 A vs. 10 A) and lower forward voltage (610 mV @ 50 A vs. 840 mV @ 10 A). However, reverse leakage current is higher (360 µA vs. 100 µA @ 45 V). Selection depends on circuit requirements for current capacity, power dissipation, and leakage specifications.

Q: What compliance certifications apply to all listed substitute parts?

A: All substitute parts listed are ROHS3 compliant and rated for the EAR99 export classification. The MBRS1045 and STPS745G-TR, STPS5045SG-TR are REACH Unaffected. The 10TQ045S is REACH Affected. Verify REACH compliance requirements for your specific application jurisdiction.

Q: Can forward voltage differences affect circuit performance?

A: Yes. Forward voltage differences directly impact power dissipation and voltage drop across the diode. The 10TQ045S exhibits 270 mV lower forward voltage (570 mV vs. 840 mV @ 10 A) compared to the MBRS1045, resulting in reduced heat generation. The STPS5045SG-TR shows 230 mV lower forward voltage (610 mV @ 50 A). Thermal and efficiency analysis is required for applications where this parameter is critical.

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