MBRB3045CT-1G Equivalent & Substitute Parts

Part Overview

The MBRB3045CT-1G is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 15 A per diode. The device is packaged in TO-262-3 (I2PAK) through-hole configuration with long leads. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different mounting technologies and package formats.

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	620 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRB3045CT-1G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 15 A minimum
Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Thermal Compatibility:

Operating Temperature - Junction: Must support -65°C to 175°C range or equivalent

Mounting and Packaging: Substitutes are grouped into two categories:

Through-Hole Direct Equivalents (Same mounting technology): Parts maintaining TO-262-3 through-hole configuration with identical lead configuration
Surface-Mount Alternatives (Different mounting technology): Parts with equivalent electrical specifications but in TO-263-3 (D2PAK) surface-mount packages, requiring PCB design modification

Parts with reduced current ratings (10 A, 5 A) or reduced temperature ranges are classified as parametric equivalents with application-specific limitations.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Tj (Operating)	Mounting Type	Package	Product Status
MBRB3045CT-1G	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	-65 to 175°C	Through Hole	TO-262-3 (I2PAK)	Obsolete
30CTQ045-1	SMC Diode Solutions	45 V	15 A	620 mV @ 15 A	1 µA @ 45 V	-55 to 175°C	Through Hole	TO-262-3 (I2PAK)	Active
VS-30CTQ045-1-M3	Vishay General Semiconductor - Diodes Division	45 V	15 A	620 mV @ 15 A	2 mA @ 45 V	-55 to 175°C	Through Hole	TO-262-3 (I2PAK)	Active
DSA30C45PC-TRL	IXYS	45 V	15 A	750 mV @ 15 A	250 µA @ 45 V	-55 to 175°C	Surface Mount	TO-263-3 (D2PAK)	Active
DSSK28-0045BS-TRL	IXYS	45 V	15 A	480 mV @ 15 A	20 mA @ 45 V	-55 to 150°C	Surface Mount	TO-263-3 (D2PAK)	Active
STPS20L45CG-TR	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	Max 150°C	Surface Mount	TO-263-3 (D2PAK)	Active
VBT1045C-M3/8W	Vishay General Semiconductor - Diodes Division	45 V	5 A	580 mV @ 5 A	500 µA @ 45 V	-40 to 150°C	Surface Mount	TO-263-3 (D2PAK)	Active
VBT2045CBP-M3/4W	Vishay General Semiconductor - Diodes Division	45 V	10 A	580 mV @ 10 A	2 mA @ 45 V	-40 to 150°C	Surface Mount	TO-263-3 (D2PAK)	Active
VS-MBRB2545CTL-M3	Vishay General Semiconductor - Diodes Division	45 V	15 A	820 mV @ 30 A	200 µA @ 45 V	-65 to 150°C	Surface Mount	TO-263-3 (D2PAK)	Active

Engineering Selection Recommendations

Through-Hole Direct Substitutes (Recommended for Pin-Compatible Replacement):

The 30CTQ045-1 (SMC Diode Solutions) and VS-30CTQ045-1-M3 (Vishay) are direct through-hole equivalents maintaining the TO-262-3 package format. Both parts are active products with ROHS3 compliance and identical electrical specifications to the MBRB3045CT-1G. The 30CTQ045-1 exhibits superior reverse leakage characteristics (1 µA vs. 200 µA), while VS-30CTQ045-1-M3 maintains the same forward voltage profile (620 mV @ 15 A). Both support the full -55°C to 175°C operating temperature range. These parts enable direct PCB substitution without layout modification.

Surface-Mount Alternatives (For Design Revision):

Surface-mount substitutes require PCB redesign but offer improved thermal management and manufacturing efficiency. Selection depends on current requirements:

15 A Rated (Full Current Equivalence): DSA30C45PC-TRL (IXYS) and VS-MBRB2545CTL-M3 (Vishay) maintain 15 A per-diode ratings. DSA30C45PC-TRL exhibits lower forward voltage (750 mV @ 15 A) with standard reverse leakage. VS-MBRB2545CTL-M3 supports extended temperature range (-65°C to 150°C) but shows elevated forward voltage (820 mV @ 30 A).
10 A Rated (Reduced Current): STPS20L45CG-TR (STMicroelectronics) and VBT2045CBP-M3/4W (Vishay) are suitable for applications with 10 A maximum per-diode requirements. STPS20L45CG-TR provides superior forward voltage characteristics (550 mV @ 10 A). VBT2045CBP-M3/4W offers excellent reverse leakage performance (2 mA @ 45 V).
5 A Rated (Limited Current): VBT1045C-M3/8W (Vishay) is restricted to 5 A per-diode applications and is not suitable for full-current replacement scenarios.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited), and EAR99 classification. Inventory availability ranges from 791 to 2100 pieces across active substitutes, supporting production requirements.

Frequently Asked Questions (FAQ)

Q: Can the MBRB3045CT-1G be replaced with a surface-mount equivalent on an existing through-hole PCB?

A: No. Surface-mount substitutes (D2PAK/TO-263-3 package) require PCB redesign and cannot be installed in through-hole footprints. Through-hole direct equivalents (30CTQ045-1 or VS-30CTQ045-1-M3) must be used for pin-compatible replacement on existing boards.

Q: What is the difference between the 30CTQ045-1 and VS-30CTQ045-1-M3?

A: Both are through-hole TO-262-3 equivalents with identical electrical specifications (45 V, 15 A, 620 mV @ 15 A). The primary difference is reverse leakage current: 30CTQ045-1 exhibits 1 µA while VS-30CTQ045-1-M3 exhibits 2 mA at 45 V. Both support -55°C to 175°C operating temperature. Selection depends on leakage performance requirements for the application.

Q: Why do some substitutes have lower current ratings (10 A or 5 A)?

A: STPS20L45CG-TR, VBT2045CBP-M3/4W, and VBT1045C-M3/8W are parametric equivalents with reduced average rectified current specifications. These parts are suitable only for applications with lower current demands and cannot replace the 15 A rating of the MBRB3045CT-1G in full-current scenarios.

Q: What is the impact of forward voltage differences among substitutes?

A: Forward voltage variations (480 mV to 820 mV) affect power dissipation and thermal performance. Lower forward voltage (DSSK28-0045BS-TRL at 480 mV) reduces heat generation, while higher forward voltage (VS-MBRB2545CTL-M3 at 820 mV) increases dissipation. Selection depends on thermal budget and efficiency requirements of the circuit.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and manufacturing standards equivalent to the original MBRB3045CT-1G.

Q: What is the significance of the operating temperature range differences?

A: The MBRB3045CT-1G supports -65°C to 175°C. Most surface-mount substitutes support -55°C to 175°C or -40°C to 150°C. Applications requiring operation below -55°C must use through-hole equivalents (30CTQ045-1 or VS-30CTQ045-1-M3) or VS-MBRB2545CTL-M3 (which extends to -65°C but in surface-mount format).

Q: Can DSSK28-0045BS-TRL be used as a direct replacement despite lower maximum operating temperature (150°C vs. 175°C)?

A: DSSK28-0045BS-TRL is suitable only for applications with maximum junction temperature requirements of 150°C or lower. Applications requiring 175°C operation must use alternatives supporting the full temperature range.

Q: What packaging format should be selected for new designs?

A: Surface-mount D2PAK (TO-263-3) packages offer superior thermal performance and manufacturing efficiency for new designs. Through-hole TO-262-3 packages are appropriate for legacy board compatibility or applications requiring through-hole mounting.

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