Product Overview
Motorola MBRF1545 Schottky Rectifier - 15A 45V Through-Hole ITO-220 Isolated Package
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Photos show TO-220 plastic package with mounting hole, face marked 94 20, R1545, and Motorola logo with 1KH visible. Sourced from an electronics distributor consolidating inventory.
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Product Overview
Motorola MBRF1545 Schottky Power Rectifier Diode rated 15A average rectified current and 45V maximum reverse voltage. Through-hole mount in an ITO-220AC or ITO-220AB isolated package - the tab is electrically isolated from the heatsink mounting surface, which matters in layouts where multiple devices share a common heatsink. Common cathode dual-diode configuration. Designed for efficient rectification in switched-mode power supplies, DC-DC converters, and high-frequency power circuits.
Key Features
- 15A average rectified current (per device)
- 45V maximum DC reverse voltage
- Forward voltage: 0.84V at 15A, 25°C
- Reverse leakage current: 1 mA at 45V, 25°C
- Common cathode dual-diode configuration (1 pair)
- Isolated tab package - ITO-220AC / ITO-220AB
- Through-hole mounting
- Junction temperature range: -55°C to 150°C
- Fast switching speed - suited for high-frequency rectification
Applications
- Repair tech replacing a blown rectifier in a switched-mode power supply - desolder the failed diode, drop in the MBRF1545, restore efficient operation with lower forward voltage drop than a standard silicon diode
- DC-DC converter builds where minimizing heat from rectification losses is a priority
- Free-wheeling diode duty in motor drive or inductive load circuits
- Reverse battery protection in portable or automotive electronics
- Makers and hobbyists designing bench power supplies or battery chargers where the isolated tab simplifies thermal management on a shared heatsink
- High-frequency rectification stages in communication circuits and inverters
Frequently Asked Questions
Is this an isolated or non-isolated package?
Isolated. The MBRF1545 uses an ITO-220AC or ITO-220AB package, where the mounting tab is electrically isolated from the die. This allows the device to be mounted directly to a grounded heatsink without an additional insulating pad, which simplifies thermal design in multi-device assemblies.
Does this contain one diode or two?
Two diodes in a common cathode configuration - both cathodes are tied together internally. This is a 1-pair common cathode arrangement, useful for full-wave rectifier circuits with a single output connection.
Is this the same as the MBR1545?
Not exactly. The "F" in MBRF1545 designates the isolated tab package (ITO-220AC/AB). The MBR1545 without the "F" typically comes in a non-isolated TO-220AC package where the tab is connected to the circuit. Electrically the diodes are equivalent; the difference is the package isolation. Confirm which your application requires before ordering.
What if I need a higher reverse voltage rating?
The MBRF15xx series includes variants with higher reverse voltage ratings - MBRF1560CT, MBRF15100CT, MBRF15150CT, and MBRF15200CT. This listing is for the 45V version.
Forty-five volts, fifteen amps, isolated tab - the unglamorous specs that keep a power supply running cool and honest. Drop one in and stop chasing heat.
