DSSK20-0045B Equivalent & Substitute Parts

Part Overview

The DSSK20-0045B is a Schottky diode array manufactured by IXYS, configured as a 1 Pair Common Cathode with a maximum reverse voltage of 45 V and average rectified current of 10 A per diode. The device is packaged in TO-220-3 through-hole configuration and is currently in Active product status with 2000 pieces in stock.

Substitute parts are necessary when the DSSK20-0045B becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when design requirements allow for compatible electrical and mechanical parameters within the same package class.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	10 A
Voltage - Forward (Vf) (Max) @ If	510 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DSSK20-0045B is determined by the following criteria:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Mounting Type: Through Hole
Package / Case: TO-220-3
Technology: Schottky or Super Barrier (functionally equivalent fast recovery rectifier technology)
Voltage - DC Reverse (Vr) (Max): 45 V or higher
Current - Average Rectified (Io) (per Diode): 10 A or higher
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Compliance Requirements:

RoHS3 Compliant
ECCN: EAR99

Substitute parts are grouped into three categories based on current rating capacity: equal current (10 A), reduced current (7.5 A), and elevated current (15 A and 30 A). Parts with elevated current ratings are suitable substitutes as they meet or exceed the electrical requirements of the main part. The part with reduced current rating (7.5 A) is included as a substitute option where current derating is acceptable within the application design.

Parameter Comparison

Parameter	DSSK20-0045B (IXYS)	SBR2045CT (Diodes Inc.)	MBR20L45CTG (onsemi)	MBR1545CTG (onsemi)	MBR2545CTG (onsemi)	MBR2550CT (Diodes Inc.)	MBR60L45CTG (onsemi)
Manufacturer	IXYS	Diodes Incorporated	onsemi	onsemi	onsemi	Diodes Incorporated	onsemi
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Super Barrier	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	50 V	45 V
Current - Average Rectified (Io) (per Diode)	10 A	10 A	10 A	7.5 A	15 A	15 A	30 A
Voltage - Forward (Vf) (Max) @ If	510 mV @ 10 A	540 mV @ 10 A	500 mV @ 10 A	840 mV @ 15 A	620 mV @ 15 A	750 mV @ 15 A	550 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 mA @ 45 V	500 µA @ 45 V	500 µA @ 45 V	100 µA @ 45 V	200 µA @ 45 V	1 mA @ 50 V	1.2 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Active	Active	Obsolete	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Electrical Equivalence):

SBR2045CT (Diodes Incorporated) and MBR20L45CTG (onsemi) are direct electrical equivalents with matching 10 A current ratings and 45 V reverse voltage. SBR2045CT uses Super Barrier technology instead of Schottky but maintains identical fast recovery speed specifications. Both are ROHS3 compliant. SBR2045CT is currently in Active status with 23,581 pieces in stock. MBR20L45CTG is marked Obsolete and should be considered only when SBR2045CT is unavailable.

Secondary Substitutes (Active Status, Elevated Current Rating):

MBR2545CTG (onsemi) and MBR60L45CTG (onsemi) provide elevated current ratings of 15 A and 30 A respectively, both at 45 V reverse voltage. These parts are suitable for applications where the design allows for higher current capacity. Both are in Active status and ROHS3 compliant. MBR2545CTG has 15,312 pieces in stock; MBR60L45CTG has 2,949 pieces in stock.

Reduced Current Substitute (Active Status, Current Derating):

MBR1545CTG (onsemi) operates at 7.5 A, which is below the DSSK20-0045B specification. This part is suitable only when application requirements allow for reduced current capacity. It is in Active status and ROHS3 compliant with 28,260 pieces in stock.

Obsolete Parts (Not Recommended for New Designs):

MBR2550CT (Diodes Incorporated) is marked Obsolete and should not be selected for new designs. This part has a higher reverse voltage rating of 50 V but is no longer actively supported.

Frequently Asked Questions (FAQ)

Q: Can MBR1545CTG replace DSSK20-0045B in all applications?

A: MBR1545CTG has a reduced current rating of 7.5 A compared to the DSSK20-0045B specification of 10 A. It is a suitable substitute only when the application design allows for operation at the lower current capacity. All other electrical parameters, including voltage rating, package, and temperature range, are compatible.

Q: What is the difference between Schottky and Super Barrier technology in the SBR2045CT?

A: Both Schottky and Super Barrier are fast recovery rectifier technologies with identical speed specifications (≤ 500ns). The SBR2045CT uses Super Barrier technology and maintains the same electrical performance as the DSSK20-0045B Schottky device for this application.

Q: Why are MBR2545CTG and MBR60L45CTG listed as substitutes if they have higher current ratings?

A: Parts with equal or higher current ratings are functionally compatible substitutes. A 15 A or 30 A rated device can safely operate at the 10 A requirement of the DSSK20-0045B. The higher current capacity provides design flexibility and does not compromise performance in the application.

Q: Can I use MBR2550CT as a substitute?

A: MBR2550CT is marked as Obsolete and should not be selected for new designs. Although it meets the electrical requirements with a 50 V reverse voltage and 15 A current rating, its obsolete status makes it unsuitable for long-term supply chain reliability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the compliance status of the DSSK20-0045B.

Q: What is the difference in forward voltage drop between the main part and substitutes?

A: The DSSK20-0045B has a forward voltage of 510 mV @ 10 A. Substitutes range from 500 mV to 840 mV depending on the part and measurement conditions. For applications sensitive to forward voltage drop, SBR2045CT (540 mV @ 10 A) and MBR20L45CTG (500 mV @ 10 A) are closest to the original specification.

Q: Do all substitute parts use the same TO-220-3 package?

A: Yes, all substitute parts listed use the TO-220-3 through-hole package, ensuring mechanical and thermal compatibility with the DSSK20-0045B.

Q: Which substitute has the best availability?

A: MBR1545CTG has the highest inventory with 28,260 pieces in stock. SBR2045CT has 23,581 pieces. For equal current rating (10 A), SBR2045CT is the preferred choice with strong availability and Active product status.

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