DSB30C45PB Equivalent & Substitute Parts

Part Overview

The DSB30C45PB is a Schottky diode array manufactured by IXYS, configured as a 1 Pair Common Cathode design rated for 45 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and is currently in Active product status with 6300 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers' components are required for supply chain diversification, or when design requirements necessitate selection from available inventory across multiple suppliers.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	590 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Operating Temperature - Junction	-55°C ~ 150°C	—
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the DSB30C45PB is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode (exact match required)
Technology: Schottky (exact match required)
Voltage - DC Reverse (Vr) (Max): 45 V (exact match or higher rating acceptable)
Current - Average Rectified (Io) (per Diode): 15 A (exact match or higher rating acceptable)
Mounting Type: Through Hole (exact match required)
Package / Case: TO-220-3 (exact match required)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Variations within typical Schottky diode specifications
Current - Reverse Leakage @ Vr: Acceptable within component tolerance ranges
Operating Temperature - Junction: Must support application requirements
Speed: Fast Recovery characteristic maintained across all substitutes

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria at 15 A rating) and Functional Alternatives (matching primary criteria with different current ratings or voltage ratings).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Leakage @ Vr	Tj (Operating)	Package	Status
DSB30C45PB	IXYS	45 V	15 A	590 mV @ 15 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
STPS3045CT	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	-55°C ~ 200°C	TO-220-3	Active
MBRP3045NTU	Fairchild Semiconductor	45 V	15 A	650 mV @ 15 A	1 mA @ 45 V	-65°C ~ 150°C	TO-220-3	Active
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	500 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Obsolete
MBR1545CTG	onsemi	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	1 mA @ 50 V	-65°C ~ 150°C	TO-220-3	Obsolete
MBR60L45CTG	onsemi	45 V	30 A	550 mV @ 30 A	1.2 mA @ 45 V	-65°C ~ 175°C	TO-220-3	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred Selection):

The following parts are direct functional equivalents to the DSB30C45PB, matching all primary substitution criteria with Active product status:

MBR2545CTG (onsemi): Matches 45 V / 15 A specifications exactly. Extended operating temperature range (-65°C ~ 175°C) provides broader thermal capability. ROHS3 compliant. 15,312 units in stock.
STPS3045CT (STMicroelectronics): Matches 45 V / 15 A specifications exactly. Forward voltage (570 mV) is lower than DSB30C45PB, indicating superior efficiency characteristics. Extended maximum junction temperature (200°C). ROHS3 compliant. 38,369 units in stock.
MBRP3045NTU (Fairchild Semiconductor): Matches 45 V / 15 A specifications exactly. Extended operating temperature range (-65°C ~ 150°C). ROHS3 compliant. 2,235 units in stock.

Functional Alternatives (Current Rating Variations):

MBR60L45CTG (onsemi): Rated for 30 A per diode at 45 V, providing higher current capacity than the DSB30C45PB. Suitable for applications requiring increased current handling. Active status. 2,949 units in stock.
MBR1545CTG (onsemi): Rated for 7.5 A per diode at 45 V, providing reduced current capacity. Suitable only for applications with lower current requirements. Active status. 28,260 units in stock.

Obsolete Parts (Not Recommended):

MBR20L45CTG (onsemi): Obsolete status. 10 A rating does not match 15 A requirement.
MBR2550CT (Diodes Incorporated): Obsolete status. 50 V rating exceeds requirement; REACH Affected status.

Compliance Considerations:

All recommended active substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the DSB30C45PB. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for the main part; onsemi substitutes show Not Applicable MSL, indicating superior moisture handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can MBR2545CTG be used as a direct replacement for DSB30C45PB?

A: Yes. MBR2545CTG is a direct functional equivalent. Both devices are rated for 45 V DC reverse voltage and 15 A average rectified current per diode in TO-220-3 packaging. The forward voltage specification (620 mV @ 15 A for MBR2545CTG versus 590 mV @ 15 A for DSB30C45PB) represents a minor variation within acceptable Schottky diode performance ranges. MBR2545CTG offers extended operating temperature range (-65°C ~ 175°C) compared to DSB30C45PB (-55°C ~ 150°C).

Q: What is the difference between the DSB30C45PB and MBR60L45CTG?

A: MBR60L45CTG is rated for 30 A per diode, double the 15 A rating of DSB30C45PB, while maintaining the same 45 V reverse voltage rating and TO-220-3 package. MBR60L45CTG is suitable for applications requiring higher current capacity. Both devices use Schottky technology with fast recovery characteristics. The forward voltage at rated current (550 mV @ 30 A for MBR60L45CTG) is lower than DSB30C45PB, indicating improved efficiency at higher currents.

Q: Why is MBR20L45CTG listed as a substitute if it is obsolete?

A: MBR20L45CTG is included in the substitute list based on the provided input data. However, its Obsolete product status makes it unsuitable for new designs or procurement. The 10 A current rating also does not match the 15 A requirement of DSB30C45PB. Active alternatives such as MBR2545CTG or STPS3045CT are recommended instead.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts listed are packaged in TO-220-3 through-hole format, matching the DSB30C45PB package specification. This ensures mechanical and electrical compatibility in existing PCB designs without layout modifications.

Q: What is the significance of the 1 Pair Common Cathode configuration?

A: The 1 Pair Common Cathode configuration indicates that the diode array contains two diodes with a shared cathode terminal. This configuration is critical for substitution compatibility. All listed substitute parts maintain this exact configuration, ensuring pin-for-pin compatibility and identical circuit functionality.

Q: Can MBR1545CTG be used in place of DSB30C45PB?

A: MBR1545CTG is not a direct equivalent. It is rated for 7.5 A per diode, which is half the 15 A rating of DSB30C45PB. MBR1545CTG is suitable only for applications with lower current requirements. Using MBR1545CTG in a circuit designed for 15 A operation would result in device overstress and potential failure.

Q: What compliance certifications are maintained across substitute parts?

A: All recommended active substitute parts (MBR2545CTG, STPS3045CT, MBRP3045NTU, and MBR60L45CTG) maintain ROHS3 compliance and REACH Unaffected status, consistent with the DSB30C45PB. These certifications ensure regulatory compliance for applications in restricted substance environments.

Q: How does forward voltage variation affect circuit performance?

A: Forward voltage (Vf) variations among substitute parts range from 570 mV to 650 mV at 15 A. These variations are within typical Schottky diode specifications and represent normal manufacturing tolerance ranges. In most applications, this variation produces negligible impact on circuit performance. Applications with strict voltage regulation requirements should verify forward voltage specifications against circuit design margins.

Q: Is STPS3045CT suitable for high-temperature applications?

A: Yes. STPS3045CT is rated for maximum junction temperature of 200°C, which exceeds the DSB30C45PB specification (-55°C ~ 150°C). STPS3045CT is suitable for applications requiring extended high-temperature operation within the 200°C maximum limit.

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