MBR1645 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MBR1645 is a 45V, 16A Schottky rectifier diode in TO-220AC package manufactured by Diodes Incorporated. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Schottky diodes in this voltage and current class are widely used in power supply circuits, rectification applications, and reverse polarity protection where fast recovery and low forward voltage drop are critical performance factors.

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	mV
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 45 V
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 MBR1645 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: ≤ 630 mV at rated current
Current - Reverse Leakage @ Vr: ≤ 200 µA @ 45V
Operating Temperature - Junction: -65°C ~ 150°C minimum

Parts are grouped into three categories based on their relationship to the MBR1645:

Direct Manufacturer Equivalents: Identical electrical specifications and base product number (MBR1645 series variants)
MFR Recommended Substitutes: Active parts meeting or exceeding all critical parameters with minor specification variations
Parametric Equivalents: Parts with identical core electrical performance and package compatibility

Parameter Comparison

Parameter	MBR1645	MBR1645-E3/45	DSS16-0045A	MBR1645-BP	STPS1545D	VS-MBR1645-M3
Manufacturer	Diodes Inc.	Vishay	IXYS	Micro Commercial Co	STMicroelectronics	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active
Vr (Max) [V]	45	45	45	45	45	45
Io [A]	16	16	16	16	15	16
Vf (Max) @ If [mV]	630 @ 16A	630 @ 16A	670 @ 15A	Not specified	840 @ 30A	630 @ 16A
Speed [ns]	≤ 500	≤ 500	≤ 500	≤ 500	≤ 500	≤ 500
Ir @ Vr [µA]	200 @ 45V	200 @ 45V	500 @ 45V	200 @ 45V	200 @ 45V	200 @ 45V
Package	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Tj (Operating) [°C]	-65 ~ 150	-65 ~ 150	Not specified	-55 ~ 150	Max 175	-65 ~ 150
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Inventory [Pcs]	1697	2300	1123	979	35200	8511

Engineering Selection Recommendations

Preferred Primary Substitutes:

VS-MBR1645-M3 (Vishay General Semiconductor - Diodes Division) is the optimal direct replacement. This part maintains identical electrical specifications to the MBR1645 across all critical parameters: 45V reverse voltage, 16A average rectified current, 630 mV forward voltage at 16A, and fast recovery characteristics. The part is active with ROHS3 compliance and REACH unaffected status. Inventory availability is substantial at 8511 pieces.

MBR1645-E3/45 (Vishay General Semiconductor - Diodes Division) provides equivalent performance with identical electrical ratings and base product number. This variant is active with ROHS3 compliance and REACH unaffected status, offering 2300 pieces in inventory.

Secondary Substitutes:

MBR1645-BP (Micro Commercial Co) maintains core electrical specifications with identical 45V/16A ratings and 200 µA reverse leakage. Operating temperature range is -55°C to 150°C, which is acceptable for most applications requiring -65°C minimum. This part is active with 979 pieces available.

DSS16-0045A (IXYS) meets the 45V/16A requirement with fast recovery characteristics. Reverse leakage is elevated at 500 µA compared to 200 µA of the original part. Forward voltage is 670 mV at 15A, representing a minor increase. This part is active with 1123 pieces in inventory.

STPS1545D (STMicroelectronics) operates at 45V with 15A average rectified current, representing a 1A reduction from the original 16A specification. Forward voltage is specified at 840 mV at 30A, which is higher than the original part. This part is active with the highest inventory availability at 35200 pieces and operates to 175°C maximum junction temperature.

Compliance Considerations:

All active substitute parts maintain ROHS3 compliance. The original MBR1645 carries REACH Affected status, while all active substitutes are REACH Unaffected, providing regulatory advantage for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can the VS-MBR1645-M3 directly replace the MBR1645 without circuit modification?

A: Yes. The VS-MBR1645-M3 is a parametric equivalent with identical voltage rating (45V), current rating (16A), forward voltage (630 mV @ 16A), and fast recovery characteristics (≤ 500ns). Both use TO-220-2 package with through-hole mounting. No circuit modifications are required.

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

A: Both are Vishay products with identical electrical specifications and base product number MBR1645. The primary difference is packaging: MBR1645-E3/45 is supplied in tube packaging while VS-MBR1645-M3 is supplied in tube packaging. Electrical performance is equivalent across all critical parameters.

Q: Why does STPS1545D have lower current rating (15A vs 16A)?

A: The STPS1545D is rated for 15A average rectified current compared to the MBR1645's 16A. This 1A difference may require circuit analysis to confirm suitability for applications operating at or near the 16A limit. The STPS1545D is suitable for applications with maximum sustained current below 15A.

Q: Is the DSS16-0045A suitable for applications requiring low reverse leakage?

A: The DSS16-0045A has reverse leakage of 500 µA at 45V, compared to 200 µA for the MBR1645. Applications sensitive to reverse leakage current should use VS-MBR1645-M3, MBR1645-E3/45, MBR1645-BP, or STPS1545D, all rated at 200 µA maximum.

Q: What is the impact of the MBR1645-BP operating temperature range of -55°C to 150°C?

A: The MBR1645-BP minimum operating temperature is -55°C compared to -65°C for the original MBR1645. Applications requiring operation below -55°C must use VS-MBR1645-M3, MBR1645-E3/45, or STPS1545D. Most commercial and industrial applications operate within the -55°C to 150°C range.

Q: Are all substitute parts available in the same TO-220-2 package?

A: Yes. All substitute parts listed use TO-220-2 package with through-hole mounting, ensuring mechanical and thermal compatibility with existing PCB designs and heat sink arrangements.

Q: Which substitute offers the best inventory availability?

A: STPS1545D offers the highest inventory at 35200 pieces. However, this part has reduced current rating (15A vs 16A) and higher forward voltage. For applications requiring full 16A capability, VS-MBR1645-M3 with 8511 pieces provides optimal availability with complete electrical equivalence.

Q: Do all substitutes maintain ROHS3 compliance?

A: All active substitute parts maintain ROHS3 compliance. The original MBR1645 is ROHS3 compliant. All substitutes are REACH Unaffected, providing regulatory advantage over the original REACH Affected status.

Q: Can MBR1645-BP be used in high-temperature applications?

A: The MBR1645-BP maximum junction temperature is 150°C, identical to the original MBR1645. For applications requiring higher temperature operation, STPS1545D is rated to 175°C maximum junction temperature.

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