VT3045CBP-M3/4W Equivalent & Substitute Parts

Part Overview

The VT3045CBP-M3/4W is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode in a Through Hole TO-220-3 package. The part is currently Active and RoHS3 Compliant. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring Schottky diode arrays with matching or comparable electrical and mechanical specifications.

Key Parameters

Parameter	VT3045CBP-M3/4W
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	570 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 45 V
Operating Temperature - Junction (Max)	200°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	RoHS3 Compliant
Part Status	Active

Substitute Part Grouping Explanation

Substitution of the VT3045CBP-M3/4W is determined by the following critical parameters:

Electrical Compatibility Requirements:

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

Mechanical Compatibility Requirements:

Package / Case: TO-220-3 (primary) or compatible through-hole packages

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications (45 V, 15 A, Schottky, Common Cathode, Fast Recovery) and the same TO-220-3 package. These parts are direct functional replacements.

Manufacturer Recommended Alternatives: Parts with comparable electrical specifications but variations in forward voltage, reverse leakage current, or operating temperature range. These parts satisfy the core electrical requirements but may have different performance characteristics in specific applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Max)	Package	Status
VT3045CBP-M3/4W	Vishay	45 V	15 A	570 mV @ 15 A	2 mA @ 45 V	200°C	TO-220-3	Active
VT3045C-M3/4W	Vishay	45 V	15 A	570 mV @ 15 A	2 mA @ 45 V	150°C	TO-220-3	Active
STPS3045CT	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	200°C	TO-220-3	Active
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	175°C	TO-220-3	Active
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	500 µA @ 45 V	150°C	TO-220-3	Obsolete
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	150°C	TO-220-3	Active
STPS1545CT	STMicroelectronics	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	175°C	TO-220-3	Active
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	1 mA @ 50 V	150°C	TO-220-3	Obsolete
STPS3045CW	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	200°C	TO-247-3	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Direct Replacement):

STPS3045CT (STMicroelectronics) and VT3045C-M3/4W (Vishay) are parametric equivalents with identical voltage and current ratings, matching forward voltage characteristics, and the same TO-220-3 package. Both parts are Active status. STPS3045CT offers a lower reverse leakage current (200 µA vs. 2 mA) and maintains the same maximum junction temperature of 200°C. VT3045C-M3/4W is an automotive-grade variant (AEC-Q101 qualified) with a reduced maximum junction temperature of 150°C.

Active Status Alternatives with Comparable Specifications:

MBR2545CTG (onsemi) provides 45 V / 15 A ratings in TO-220-3 package with Active status. Forward voltage is slightly elevated at 620 mV @ 15 A compared to 570 mV, and maximum junction temperature is 175°C. This part is suitable for applications where the higher forward voltage drop is acceptable.

STPS40L45CT (STMicroelectronics) is rated for 20 A per diode at 45 V, exceeding the 15 A requirement of the main part. This part offers lower forward voltage (530 mV @ 20 A) and is Active status, suitable for applications requiring higher current capacity. Maximum junction temperature is 150°C.

Obsolete Status Parts (Not Recommended for New Designs):

MBR20L45CTG (onsemi) and MBR2550CT (Diodes Incorporated) are marked Obsolete and should not be selected for new designs. MBR20L45CTG is rated for only 10 A per diode, below the 15 A requirement. MBR2550CT is rated for 50 V / 15 A but exhibits significantly higher forward voltage (750 mV @ 15 A).

Package Variant:

STPS3045CW (STMicroelectronics) is electrically identical to STPS3045CT but uses a TO-247-3 package instead of TO-220-3. This part is suitable only if the PCB layout and thermal management design accommodate the larger TO-247-3 footprint.

Current Derating Consideration:

STPS1545CT (STMicroelectronics) is rated for 7.5 A per diode at 45 V, below the 15 A requirement. This part is not suitable as a direct substitute for applications requiring the full 15 A rating.

Frequently Asked Questions (FAQ)

Q: Can STPS3045CT be used as a direct replacement for VT3045CBP-M3/4W?

A: Yes. STPS3045CT is a parametric equivalent with identical voltage (45 V), current (15 A), forward voltage (570 mV @ 15 A), and package (TO-220-3) specifications. Both parts are Active status and RoHS3 compliant. The primary difference is reverse leakage current: STPS3045CT exhibits 200 µA @ 45 V compared to 2 mA @ 45 V for the VT3045CBP-M3/4W. This lower leakage may provide improved performance in low-current standby conditions.

Q: What is the difference between VT3045C-M3/4W and VT3045CBP-M3/4W?

A: Both parts are manufactured by Vishay and share identical electrical specifications (45 V, 15 A, 570 mV @ 15 A forward voltage). VT3045C-M3/4W is automotive-grade with AEC-Q101 qualification and a maximum junction temperature of 150°C. VT3045CBP-M3/4W has a maximum junction temperature of 200°C. Selection depends on application requirements and automotive qualification needs.

Q: Can MBR2545CTG replace VT3045CBP-M3/4W?

A: MBR2545CTG is functionally compatible with matching 45 V and 15 A ratings in TO-220-3 package. However, forward voltage is higher at 620 mV @ 15 A compared to 570 mV @ 15 A. This 50 mV difference results in approximately 8.3% higher power dissipation at rated current. Applications sensitive to thermal performance or power efficiency should evaluate this difference. MBR2545CTG is Active status and suitable for applications where the higher forward voltage is acceptable.

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

A: MBR20L45CTG is included in the substitute list as a historical reference and for legacy design support. However, it is marked Obsolete and rated for only 10 A per diode, below the 15 A requirement of the main part. New designs should not use this part. Active alternatives such as STPS3045CT or MBR2545CTG are recommended.

Q: Can STPS40L45CT be used in place of VT3045CBP-M3/4W?

A: STPS40L45CT is rated for 20 A per diode at 45 V, exceeding the 15 A requirement. The part is electrically compatible and offers lower forward voltage (530 mV @ 20 A). However, maximum junction temperature is 150°C compared to 200°C for the main part. STPS40L45CT is suitable for applications where higher current capacity is beneficial and thermal constraints allow operation at 150°C maximum junction temperature.

Q: What is the significance of the TO-247-3 package variant STPS3045CW?

A: STPS3045CW is electrically identical to STPS3045CT but uses a TO-247-3 package instead of TO-220-3. The TO-247-3 package is physically larger and provides improved thermal performance through increased lead surface area. This variant is suitable only if the PCB layout, mounting hardware, and thermal design accommodate the larger footprint. Direct pin-for-pin substitution with TO-220-3 designs is not possible without PCB modification.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current determines standby power consumption and is critical in low-power or battery-operated applications. VT3045CBP-M3/4W exhibits 2 mA @ 45 V leakage, while STPS3045CT exhibits 200 µA @ 45 V. The lower leakage of STPS3045CT reduces standby power by approximately 90%. Applications with stringent standby power budgets should prioritize parts with lower reverse leakage specifications.

Q: Is MBR2550CT suitable as a substitute?

A: MBR2550CT is marked Obsolete and should not be selected for new designs. While it provides 15 A at a higher voltage rating (50 V), forward voltage is significantly elevated at 750 mV @ 15 A compared to 570 mV @ 15 A for the main part. This represents a 31.6% increase in forward voltage drop and corresponding increase in power dissipation. Active alternatives are available and should be used instead.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: (1) Diode Configuration (1 Pair Common Cathode), (2) Technology (Schottky), (3) Voltage - DC Reverse (Vr) minimum 45 V, (4) Current - Average Rectified (Io) minimum 15 A per diode, (5) Speed (Fast Recovery ≤ 500 ns), (6) Mounting Type (Through Hole), and (7) Package (TO-220-3 for direct PCB compatibility). Variations in forward voltage, reverse leakage, and junction temperature are secondary considerations dependent on application requirements.

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