MBR1645 Equivalent & Substitute Parts

Part Overview

The MBR1645 is a Schottky rectifier diode rated for 45 V DC reverse voltage and 16 A average rectified current in a through-hole TO-220-2 package. The original onsemi MBR1645 is classified as obsolete, creating a requirement for equivalent alternatives. Active substitutes with identical or compatible electrical specifications are available from multiple manufacturers including onsemi, Vishay, Taiwan Semiconductor Corporation, IXYS, STMicroelectronics, and Micro Commercial Co. Selection of an appropriate substitute depends on matching voltage, current, thermal characteristics, and package requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) (Max) @ If	630	mV @ 16 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 175	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBR1645 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 45 V to ensure safe operation in the original circuit.

Current Rating: Substitute parts must support a minimum average rectified current of 16 A. Parts rated below 16 A are classified as similar but not direct substitutes.

Package Type: Direct substitutes use through-hole TO-220-2 or TO-220AC packages. Surface-mount alternatives (TO-263AB) are listed separately due to mounting incompatibility.

Forward Voltage: Forward voltage drop at rated current affects thermal performance and efficiency. Variations within the 630 mV specification are acceptable.

Reverse Leakage Current: Leakage current at 45 V should not exceed 200 µA for optimal performance, though higher values (up to 500 µA or 5 mA) may be acceptable depending on circuit requirements.

Temperature Range: Operating junction temperature range must support the application's thermal environment. The original part specifies -65°C to 175°C.

Product Status and Compliance: Active parts with RoHS3 compliance are preferred over obsolete parts. Compliance certifications (RoHS, REACH) determine suitability for regulated applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Ir @ 45V [µA]	Package	Mounting	Tj (°C)	Status	RoHS
MBR1645	onsemi	45	16	630 @ 16A	200	TO-220-2	Through Hole	-65 to 175	Obsolete	Non-compliant
MBR1645G	onsemi	45	16	630 @ 16A	200	TO-220-2	Through Hole	-65 to 175	Active	RoHS3
MBR1645	Taiwan Semiconductor Corporation	45	16	630 @ 16A	500	TO-220-2	Through Hole	-55 to 150	Active	RoHS3
MBR1645-E3/45	Vishay General Semiconductor - Diodes Division	45	16	630 @ 16A	200	TO-220-2	Through Hole	-65 to 150	Active	RoHS3
MBRB1645	Vishay General Semiconductor - Diodes Division	45	16	630 @ 16A	200	TO-263AB	Surface Mount	-65 to 150	Obsolete	Non-compliant
DSS10-0045A	IXYS	45	10	680 @ 10A	300	TO-220-2	Through Hole	-55 to 175	Active	RoHS3
DSS10-0045B	IXYS	45	10	510 @ 10A	5000	TO-220-2	Through Hole	-55 to 150	Active	RoHS3
DSS16-0045A	IXYS	45	16	670 @ 15A	500	TO-220-2	Through Hole	Not specified	Active	RoHS3
DSS16-0045B	IXYS	45	16	480 @ 15A	10000	TO-220-2	Through Hole	-55 to 150	Active	RoHS3
MBR1645-BP	Micro Commercial Co	45	16	Not specified	200	TO-220-2	Through Hole	-55 to 150	Active	Not specified
STPS1545D	STMicroelectronics	45	15	840 @ 30A	200	TO-220-2	Through Hole	Max 175	Active	RoHS3

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Specifications):

MBR1645G (onsemi) is the primary direct substitute. It maintains all electrical parameters of the original MBR1645 while offering active product status and RoHS3 compliance. This part is recommended for new designs and replacements where the original specification must be preserved.

MBR1645-E3/45 (Vishay) provides equivalent electrical performance with active status and RoHS3 compliance. Operating temperature range is -65°C to 150°C, which is 25°C lower than the original at the maximum junction temperature. This part is suitable for applications not requiring the full 175°C upper limit.

MBR1645 (Taiwan Semiconductor Corporation) offers active status and RoHS3 compliance with identical voltage and current ratings. Reverse leakage current is specified at 500 µA versus 200 µA for the original, and the operating temperature range is -55°C to 150°C. This part is acceptable where the higher leakage and reduced temperature range do not impact circuit performance.

Similar Substitutes (16 A Rating, Compatible Electrical Performance):

DSS16-0045A (IXYS) and DSS16-0045B (IXYS) both support 16 A at 45 V with active status and RoHS3 compliance. DSS16-0045A exhibits forward voltage of 670 mV at 15 A and reverse leakage of 500 µA. DSS16-0045B shows lower forward voltage (480 mV at 15 A) but higher reverse leakage (10 mA). Both are through-hole TO-220-2 packages suitable for direct board-level replacement.

STPS1545D (STMicroelectronics) is rated for 15 A at 45 V with active status and RoHS3 compliance. Forward voltage is specified at 840 mV at 30 A. This part operates at a maximum junction temperature of 175°C, matching the original specification. The 1 A lower current rating may be acceptable in applications with design margin.

MBR1645-BP (Micro Commercial Co) supports 16 A at 45 V in a through-hole TO-220-2 package with active status. Operating temperature range is -55°C to 150°C. Compliance certifications are not specified for this part.

Lower Current Alternatives (10 A Rating):

DSS10-0045A and DSS10-0045B (IXYS) are rated for 10 A at 45 V. These parts are not direct substitutes due to the 6 A reduction in current capacity. Selection of these parts requires circuit analysis to confirm adequate design margin.

Surface-Mount Alternative (Package Change Required):

MBRB1645 (Vishay) provides 16 A at 45 V in a surface-mount TO-263AB (D2PAK) package. This part is classified as obsolete and non-RoHS compliant. Board redesign is required for implementation. This option is not recommended for new applications.

Frequently Asked Questions (FAQ)

Q: Can MBR1645G be used as a direct replacement for the obsolete MBR1645?

A: Yes. MBR1645G (onsemi) is electrically and mechanically identical to the original MBR1645. It maintains the same 45 V voltage rating, 16 A current rating, 630 mV forward voltage, and TO-220-2 through-hole package. MBR1645G is active and RoHS3 compliant, making it the recommended direct substitute.

Q: What is the difference between MBR1645-E3/45 and MBR1645G?

A: Both parts are manufactured to the same electrical specification (45 V, 16 A, 630 mV forward voltage). The primary difference is the manufacturer: MBR1645-E3/45 is from Vishay, while MBR1645G is from onsemi. MBR1645-E3/45 has a maximum operating junction temperature of 150°C compared to 175°C for MBR1645G. Both are active and RoHS3 compliant.

Q: Can DSS16-0045A or DSS16-0045B replace the MBR1645?

A: Yes, with circuit verification. Both IXYS parts support 16 A at 45 V in TO-220-2 through-hole packages. DSS16-0045A exhibits 670 mV forward voltage and 500 µA reverse leakage. DSS16-0045B shows 480 mV forward voltage but 10 mA reverse leakage. The higher reverse leakage in DSS16-0045B may affect circuit performance in sensitive applications. Both are active and RoHS3 compliant.

Q: Why is the Taiwan Semiconductor Corporation MBR1645 not recommended as a primary substitute?

A: While the Taiwan Semiconductor Corporation MBR1645 is active and RoHS3 compliant, it specifies reverse leakage current at 500 µA versus 200 µA for the original part. The operating temperature range is also reduced to -55°C to 150°C. These differences may impact circuit performance in applications sensitive to leakage current or requiring full temperature range operation. MBR1645G is preferred due to lower leakage specification.

Q: Can STPS1545D be used in place of MBR1645?

A: STPS1545D is a viable substitute with the following considerations: it is rated for 15 A instead of 16 A, and forward voltage is specified at 840 mV at 30 A (higher than the 630 mV specification of MBR1645). The part is active, RoHS3 compliant, and maintains the 45 V voltage rating and TO-220-2 through-hole package. Circuit analysis is required to confirm that the 1 A current reduction and higher forward voltage do not impact performance.

Q: Are DSS10-0045A and DSS10-0045B suitable substitutes?

A: DSS10-0045A and DSS10-0045B are not direct substitutes due to their 10 A current rating, which is 6 A below the MBR1645 specification. These parts are classified as similar alternatives and require circuit analysis to confirm adequate design margin. Selection is appropriate only when the application current requirement is confirmed to be 10 A or less.

Q: What is the difference between TO-220-2 and TO-220AC packages?

A: TO-220-2 and TO-220AC are equivalent through-hole package designations used by different manufacturers. Both refer to a three-lead package with two signal leads and one tab for thermal mounting. Parts specified with either designation are mechanically and electrically compatible for board-level replacement.

Q: Why is MBRB1645 not recommended as a substitute?

A: MBRB1645 is a surface-mount variant in a TO-263AB (D2PAK) package, whereas the original MBR1645 is a through-hole TO-220-2 package. Board redesign is required for implementation. Additionally, MBRB1645 is classified as obsolete and non-RoHS compliant. This option is not suitable for new applications or standard replacements.

Q: What compliance certifications should I verify when selecting a substitute?

A: Verify RoHS and REACH compliance status for applications subject to regulatory requirements. MBR1645G, MBR1645-E3/45, and all IXYS and STMicroelectronics alternatives listed are RoHS3 compliant and REACH unaffected. The original onsemi MBR1645 and MBRB1645 are non-compliant and should not be used in regulated applications.

Q: Can I use multiple lower-current parts in parallel to replace a single MBR1645?

A: Parallel operation of Schottky diodes is not recommended without additional circuit design considerations. Current sharing between parallel diodes is not guaranteed due to differences in forward voltage characteristics. This approach requires engineering analysis and is outside the scope of direct substitution.

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