MBR1545CT-BP Equivalent & Substitute Parts

Part Overview

The MBR1545CT-BP is a Schottky diode array manufactured by Micro Commercial Co, configured as a 1 Pair Common Cathode arrangement rated for 45 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 case suitable for high-current rectification applications.

This part is classified as Obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array configuration.

Substiute Parts

MBR1545CT-BP

Micro Commercial CoIn Stock: 837MBR1545CT-BP Datasheet

Current PartRFQ

MBR1645CT-BP

Micro Commercial CoIn Stock: 1043MBR1645CT-BP Datasheet

MFR RecommendedRFQ

VT3045C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1734VT3045C-M3/4W Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MBR1545CT-BP is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode (electrical topology must match)
• Technology: Schottky (device type must remain consistent)
• Voltage - DC Reverse (Vr) (Max): 45 V (voltage rating must be equal or greater)
• Current - Average Rectified (Io) (per Diode): 15 A minimum (current capacity must meet or exceed requirement)
• Package / Case: TO-220-3 (mechanical form factor must be identical)
• Mounting Type: Through Hole (PCB assembly method must be compatible)

Secondary Compatibility Parameters:

• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature Range: Must encompass or match the application requirement

Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding current ratings while maintaining all other parameters are classified as compatible upgrades.

Parameter Comparison

Engineering Selection Recommendations

MBR1645CT-BP (Manufacturer Recommended Substitute)

The MBR1645CT-BP is the manufacturer-recommended substitute for the obsolete MBR1545CT-BP. This part maintains identical electrical specifications across all primary substitution criteria: 45 V reverse voltage rating, 1 Pair Common Cathode configuration, Schottky technology, and TO-220-3 package. The MBR1645CT-BP provides a 1 A increase in average rectified current capacity (16 A versus 15 A), representing a compatible upgrade with no derating required. The part is currently in Active product status with 983 units in stock, ensuring supply chain continuity. Both parts share identical reverse leakage characteristics (100 µA @ 45 V) and operating temperature range (-55°C ~ 150°C). The MBR1645CT-BP is the primary selection for direct replacement applications.

VT3045C-M3/4W (Alternative Substitute)

The VT3045C-M3/4W, manufactured by Vishay General Semiconductor - Diodes Division, meets all primary substitution criteria with identical 45 V reverse voltage, 15 A current rating, 1 Pair Common Cathode configuration, Schottky technology, and TO-220-3 package. This part is currently in Active product status with 1700 units in stock. The VT3045C-M3/4W includes AEC-Q101 automotive qualification and is designated as Automotive grade, providing additional quality assurance for applications requiring automotive-level reliability. The operating temperature range is -40°C ~ 150°C, which is narrower at the lower bound compared to the MBR1545CT-BP (-55°C). The reverse leakage specification is higher at 2 mA @ 45 V compared to 100 µA @ 45 V for the original part. Selection of the VT3045C-M3/4W is appropriate for automotive applications or where automotive-grade qualification is required, provided the -40°C minimum junction temperature meets application requirements.

Frequently Asked Questions (FAQ)

Q: Can the MBR1645CT-BP be used as a direct replacement for the MBR1545CT-BP?

A: Yes. The MBR1645CT-BP is the manufacturer-recommended substitute. Both parts share identical voltage ratings (45 V), diode configuration (1 Pair Common Cathode), technology (Schottky), package (TO-220-3), and operating temperature range (-55°C ~ 150°C). The MBR1645CT-BP provides 16 A current capacity compared to 15 A, representing a compatible upgrade with no design modifications required.

Q: What is the difference between the MBR1645CT-BP and VT3045C-M3/4W?

A: Both parts are functionally equivalent substitutes for the MBR1545CT-BP with identical voltage (45 V), current (15 A for VT3045C-M3/4W, 16 A for MBR1645CT-BP), configuration, technology, and package. The primary differences are: (1) Manufacturer: Micro Commercial Co versus Vishay; (2) Reverse leakage: 100 µA @ 45 V (both Micro Commercial parts) versus 2 mA @ 45 V (Vishay); (3) Operating temperature minimum: -55°C (Micro Commercial) versus -40°C (Vishay); (4) Qualification: VT3045C-M3/4W includes AEC-Q101 automotive qualification. Selection depends on application requirements for temperature range, leakage specifications, and automotive qualification.

Q: Are there any package compatibility issues between these substitutes?

A: No. All three parts use the TO-220-3 Through Hole package. The MBR1545CT-BP and MBR1645CT-BP use the TO-220AB supplier device package designation, while the VT3045C-M3/4W uses TO-220-3 designation. These designations refer to the same physical package form factor and are mechanically and electrically compatible for PCB assembly.

Q: What is the significance of the current rating difference between MBR1545CT-BP (15 A) and MBR1645CT-BP (16 A)?

A: The MBR1645CT-BP provides 1 A additional average rectified current capacity per diode. This represents a compatible upgrade with no derating or design modification required. Applications designed for 15 A operation will function within specification using the MBR1645CT-BP without thermal or electrical stress.

Q: Why does the VT3045C-M3/4W have higher reverse leakage (2 mA @ 45 V) compared to the Micro Commercial parts (100 µA @ 45 V)?

A: Reverse leakage specifications vary between manufacturers based on device design, process technology, and quality grade. The VT3045C-M3/4W is specified at 2 mA @ 45 V, which is within acceptable limits for Schottky diode arrays. Applications sensitive to reverse leakage should evaluate this parameter against circuit requirements. The higher leakage does not preclude use in most rectification applications.

Q: Is the narrower operating temperature range of the VT3045C-M3/4W (-40°C ~ 150°C versus -55°C ~ 150°C) a limitation?

A: The VT3045C-M3/4W minimum junction temperature of -40°C is suitable for most industrial and automotive applications. Selection of this part is appropriate when the application environment does not require operation below -40°C. Applications requiring operation at -55°C must use the MBR1545CT-BP or MBR1645CT-BP.

Q: What is the inventory status of these substitute parts?

A: MBR1545CT-BP (original, Obsolete): 826 units in stock. MBR1645CT-BP (recommended substitute, Active): 983 units in stock. VT3045C-M3/4W (alternative substitute, Active): 1700 units in stock. Both active substitutes have adequate inventory for production requirements.