MBR1045 Equivalent & Substitute Parts

Part Overview

The MBR1045 is a Schottky rectifier diode rated for 45 V DC reverse voltage and 10 A average rectified current in a Through Hole TO-220-2 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 10 A	mV
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBR1045 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 10 A minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2 or compatible variant

Secondary Compatibility Factors:

Forward voltage drop (Vf) at rated current
Reverse leakage current (Ir) at rated voltage
Recovery speed characteristics
Operating temperature range
RoHS and REACH compliance status

Parts are grouped into three categories based on electrical equivalence and product status:

Parametric Equivalents maintain identical electrical specifications and active product status, enabling direct substitution without circuit redesign.

Direct Manufacturer Alternatives provide equivalent electrical performance from different manufacturers with active availability.

Upgrade Options offer enhanced specifications or extended operating temperature ranges while maintaining core electrical parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Speed	Tj (Max) [°C]	Product Status	Package
MBR1045	Vishay General Semiconductor	45	10	570 @ 10 A	100 @ 45 V	Fast Recovery ≤ 500ns	150	Obsolete	TO-220-2
MBR1045-E3/45	Vishay General Semiconductor	45	10	570 @ 10 A	100 @ 45 V	Fast Recovery ≤ 500ns	150	Active	TO-220-2
STPS1045D	STMicroelectronics	45	10	600 @ 10 A	100 @ 45 V	Fast Recovery ≤ 500ns	175	Active	TO-220-2
MBR1045G	onsemi	45	10	840 @ 20 A	100 @ 45 V	Fast Recovery ≤ 500ns	175	Active	TO-220-2
MBR1040F-BP	Micro Commercial Co	40	10	550 @ 10 A	500 @ 40 V	Fast Recovery ≤ 500ns	150	Active	TO-220-2 Isolated Tab
MBR1045-BP	Micro Commercial Co	45	10	Not Specified	100 @ 45 V	No Recovery Time > 500mA	150	Active	TO-220-2
MBR1045	Taiwan Semiconductor Corporation	45	10	700 @ 10 A	100 @ 45 V	Fast Recovery ≤ 500ns	150	Active	TO-220-2
MBR1040-BP	Micro Commercial Co	40	10	Not Specified	100 @ 40 V	No Recovery Time > 500mA	150	Active	TO-220-2
MBR1050	Fairchild Semiconductor	50	10	950 @ 10 A	100 @ 50 V	Fast Recovery ≤ 500ns	150	Active	TO-220-2

Engineering Selection Recommendations

Recommended Primary Substitute: MBR1045-E3/45

The MBR1045-E3/45 from Vishay General Semiconductor - Diodes Division is the optimal substitute for the obsolete MBR1045. This part maintains identical electrical specifications including 45 V reverse voltage rating, 10 A average rectified current, and 570 mV forward voltage drop at 10 A. The part is in active product status with ROHS3 compliance and 2,350 units in stock. Direct pin-to-pin and functional compatibility is assured.

Alternative Equivalent: STPS1045D

The STPS1045D from STMicroelectronics provides equivalent electrical performance with 45 V reverse voltage and 10 A current rating. Forward voltage is specified at 600 mV at 10 A, representing a 30 mV increase over the original specification. Maximum junction temperature extends to 175°C compared to 150°C for the original part. This part is active with 55,200 units in stock and ROHS3 compliance.

Alternative Equivalent: MBR1045 (Taiwan Semiconductor Corporation)

Taiwan Semiconductor Corporation manufactures an MBR1045 variant with identical voltage and current ratings. Forward voltage is specified at 700 mV at 10 A. The part is active with ROHS3 compliance and 4,214 units in stock. Operating temperature range is -55°C to 150°C.

Upgrade Option: MBR1045G

The MBR1045G from onsemi offers extended maximum junction temperature of 175°C while maintaining 45 V and 10 A ratings. Forward voltage is specified at 840 mV at 20 A. This part is active with 50,200 units in stock and ROHS3 compliance. The extended temperature rating provides design margin for thermal management.

Lower Voltage Alternatives: MBR1040F-BP and MBR1040-BP

The MBR1040F-BP and MBR1040-BP from Micro Commercial Co are rated for 40 V reverse voltage, representing a 5 V reduction from the original specification. These parts maintain 10 A current rating and are suitable only for applications where the 45 V rating is not required. MBR1040F-BP features isolated tab packaging (ITO-220AC) and forward voltage of 550 mV at 10 A. MBR1040-BP does not specify forward voltage characteristics.

Higher Voltage Alternative: MBR1050

The MBR1050 from Fairchild Semiconductor is rated for 50 V reverse voltage, providing 5 V additional margin over the original specification. Current rating remains 10 A. Forward voltage is specified at 950 mV at 10 A. This part is active and suitable for applications requiring higher voltage headroom.

Frequently Asked Questions (FAQ)

Q: Can MBR1045-E3/45 be used as a direct replacement for the obsolete MBR1045?

A: Yes. The MBR1045-E3/45 maintains identical electrical specifications: 45 V reverse voltage, 10 A average rectified current, 570 mV forward voltage at 10 A, and TO-220-2 package. The part is in active production status with ROHS3 compliance.

Q: What is the difference between MBR1045-E3/45 and STPS1045D?

A: Both parts meet the core electrical requirements of 45 V and 10 A. The STPS1045D has a forward voltage of 600 mV at 10 A (30 mV higher) and maximum junction temperature of 175°C (25°C higher). STPS1045D is manufactured by STMicroelectronics with significantly higher inventory availability (55,200 units).

Q: Can MBR1040F-BP or MBR1040-BP be used in place of MBR1045?

A: These parts are rated for 40 V reverse voltage, which is 5 V lower than the original 45 V specification. Substitution is only permissible in applications where the actual reverse voltage stress does not exceed 40 V. Circuit analysis is required to confirm voltage margins.

Q: What is the significance of the isolated tab variant (ITO-220AC) in MBR1040F-BP?

A: The isolated tab design electrically isolates the mounting tab from the cathode terminal, enabling direct mounting to a common heat sink without electrical isolation hardware. Standard TO-220-2 packages have the tab connected to the cathode. Application requirements determine whether isolated tab functionality is necessary.

Q: Is MBR1050 suitable as a substitute for MBR1045?

A: MBR1050 is rated for 50 V reverse voltage, providing 5 V additional margin. The 10 A current rating is identical. Forward voltage is 950 mV at 10 A, which is 380 mV higher than the original specification. Substitution is permissible in applications where the higher forward voltage drop does not compromise circuit performance or thermal management.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode exhibits fast recovery characteristics with recovery time not exceeding 500 nanoseconds when switching currents greater than 200 mA. This parameter is critical for high-frequency switching applications and power supply circuits.

Q: Are all substitute parts RoHS compliant?

A: MBR1045-E3/45, STPS1045D, MBR1045G, and the Taiwan Semiconductor Corporation MBR1045 are ROHS3 compliant. MBR1040F-BP, MBR1040-BP, and MBR1050 do not specify RoHS status in the provided data. Compliance verification is required for applications with RoHS requirements.

Q: What is the difference between "Fast Recovery ≤ 500ns" and "No Recovery Time > 500mA"?

A: "Fast Recovery ≤ 500ns" specifies a maximum recovery time of 500 nanoseconds for switching transients. "No Recovery Time > 500mA" indicates the part does not specify a defined recovery time characteristic for currents exceeding 500 mA. The fast recovery specification is preferred for high-frequency switching applications.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: Interchangeability depends on circuit-specific requirements. Parts with identical electrical specifications (MBR1045-E3/45) are directly interchangeable. Parts with different forward voltage drops (STPS1045D, MBR1045G, MBR1050) may require thermal analysis and circuit performance verification before substitution.

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