MBR1645 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MBR1645 is a 45V, 16A Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division in a TO-220AC package. This component is classified as obsolete, though 1697 pieces remain in stock as new original inventory. The MBR1645 serves as a fast recovery rectifier suitable for power supply and switching applications requiring low forward voltage drop and rapid switching characteristics.

Due to the obsolete product status, identification of active equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability. Multiple manufacturers offer parametrically equivalent alternatives with active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	45	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) Maximum @ If	630 mV @ 16 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Technology	Schottky
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the MBR1645 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) Maximum: 45 V
Current - Average Rectified (Io): 16 A (or higher)
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Voltage - Forward (Vf) Maximum @ If: 630 mV @ 16 A (or equivalent at rated current)
Current - Reverse Leakage @ Vr: 200 µA @ 45 V (or lower)
Operating Temperature - Junction: -65°C to 150°C minimum range

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents: Parts with identical electrical specifications and active product status from the same manufacturer (Vishay).

Upgrade Options: Parts with identical core specifications but enhanced operating temperature range or improved compliance status from alternative manufacturers.

Manufacturer Recommended Alternatives: Parts from other manufacturers meeting the primary matching criteria with minor variations in secondary parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io A	Vf (Max) mV	Reverse Leakage µA @ 45V	Tj (°C)	Product Status	RoHS Status
MBR1645	Vishay General Semiconductor	45	16	630 @ 16A	200	-65 to 150	Obsolete	Non-compliant
MBR1645-E3/45	Vishay General Semiconductor	45	16	630 @ 16A	200	-65 to 150	Active	ROHS3 Compliant
VS-MBR1645-M3	Vishay General Semiconductor	45	16	630 @ 16A	200	-65 to 150	Active	ROHS3 Compliant
MBR1645G	onsemi	45	16	630 @ 16A	200	-65 to 175	Active	ROHS3 Compliant
DSS16-0045A	IXYS	45	16	670 @ 15A	500	Not specified	Active	ROHS3 Compliant
MBR1645-BP	Micro Commercial Co	45	16	Not specified	200	-55 to 150	Active	Not specified
STPS1545D	STMicroelectronics	45	15	840 @ 30A	200	Max 175	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Status:

MBR1645-E3/45 and VS-MBR1645-M3 are the primary recommended substitutes. Both are manufactured by Vishay General Semiconductor and provide identical electrical specifications to the obsolete MBR1645. Both parts carry ROHS3 compliance certification and active product status. VS-MBR1645-M3 offers higher inventory availability (8511 pieces) compared to MBR1645-E3/45 (2300 pieces).

For Enhanced Operating Temperature Range:

MBR1645G, manufactured by onsemi, provides an extended maximum junction temperature of 175°C compared to the 150°C maximum of the original MBR1645. This part maintains identical electrical specifications and carries ROHS3 compliance. This option is suitable for applications requiring higher thermal headroom. Inventory availability is substantial at 17020 pieces.

For Alternative Manufacturer Options:

DSS16-0045A (IXYS) and STPS1545D (STMicroelectronics) are active alternatives meeting the 45V, 16A core requirements. DSS16-0045A maintains the 16A current rating with slightly elevated forward voltage (670 mV @ 15A) and reverse leakage (500 µA @ 45V). STPS1545D operates at 15A average rectified current, representing a minor current derating, with elevated forward voltage specification (840 mV @ 30A). Both carry ROHS3 compliance.

MBR1645-BP (Micro Commercial Co) provides an active alternative with identical core specifications and 979 pieces in stock. Operating temperature range is reduced to -55°C to 150°C.

Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance certification. The original MBR1645 is RoHS non-compliant. Selection of compliant alternatives ensures alignment with current regulatory requirements and supply chain standards.

Frequently Asked Questions (FAQ)

Q: Can MBR1645-E3/45 be used as a direct replacement for the obsolete MBR1645?

A: Yes. MBR1645-E3/45 is a parametric equivalent with identical electrical specifications: 45V reverse voltage, 16A average rectified current, 630 mV forward voltage @ 16A, and identical operating temperature range (-65°C to 150°C). The primary difference is active product status and ROHS3 compliance. Packaging is TO-220AC in both cases.

Q: What is the difference between MBR1645-E3/45 and VS-MBR1645-M3?

A: Both are Vishay parametric equivalents with identical electrical specifications. VS-MBR1645-M3 includes capacitance specification (1400 pF @ 5V, 1MHz) not provided for MBR1645-E3/45. VS-MBR1645-M3 has significantly higher inventory (8511 pieces vs. 2300 pieces). Both carry ROHS3 compliance and active product status.

Q: Why would I select MBR1645G over the Vishay alternatives?

A: MBR1645G offers an extended maximum junction temperature of 175°C compared to 150°C for Vishay alternatives. This provides additional thermal margin in high-temperature applications. MBR1645G is manufactured by onsemi and carries ROHS3 compliance with the highest inventory availability (17020 pieces).

Q: Is STPS1545D a suitable substitute despite the 15A current rating?

A: STPS1545D operates at 15A average rectified current, representing a 1A derating from the 16A specification of MBR1645. This part is suitable only for applications where the actual operating current does not exceed 15A. The forward voltage specification is elevated (840 mV @ 30A) compared to the original part. This substitute is appropriate for current-limited applications only.

Q: What are the package compatibility considerations?

A: All listed substitutes use TO-220-2 package / case designation with TO-220AC supplier device package. Physical pin configuration and mounting footprint are compatible. Thermal characteristics may vary slightly between manufacturers due to die and substrate design differences, though all parts are rated for the same voltage and current specifications.

Q: Are there any compliance differences between the substitute options?

A: All active substitute parts carry ROHS3 compliance certification. The original MBR1645 is RoHS non-compliant. MBR1645-BP compliance status is not specified in available documentation. For applications requiring documented RoHS compliance, select from MBR1645-E3/45, VS-MBR1645-M3, MBR1645G, DSS16-0045A, or STPS1545D.

Q: What is the significance of the "Fast Recovery" speed classification?

A: Fast Recovery ≤ 500ns, > 200mA (Io) indicates the diode switching speed and reverse recovery time. All listed substitutes maintain this classification, ensuring compatibility in switching power supply and high-frequency rectification applications. This parameter is critical for minimizing switching losses and electromagnetic interference.

Q: Can I use MBR1645-BP as a substitute?

A: MBR1645-BP is an active alternative with identical core electrical specifications (45V, 16A, 200 µA reverse leakage). The operating temperature range is reduced to -55°C to 150°C compared to -65°C to 150°C for the original part. This substitute is suitable for applications not requiring the full -65°C lower temperature limit. Packaging is TO-220AC compatible.

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