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Product Detailed Parameters
- Description：DIODE SCHOTTKY 45V 18A TO263AB
- Series：-
- Mfr：Vishay General Semiconductor - Diodes Division
- Package：Tube
- Technology：Schottky
- Voltage - DC Reverse (Vr) (Max)：45 V
- Current - Average Rectified (Io)：18A
- Voltage - Forward (Vf) (Max) @ If：600 mV @ 18 A
- Speed：Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr)：-
- Current - Reverse Leakage @ Vr：2.5 mA @ 45 V
- Capacitance @ Vr, F：-
- Mounting Type：Surface Mount
- Package / Case：TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Supplier Device Package：TO-263AB (D2PAK)
- Operating Temperature - Junction：-55°C ~ 175°C
- Grade：-
- Qualification：-
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Overview
The Vishay 18TQ045S is a Schottky rectifier in the TO-263AB (D2PAK) package. It features an average forward current of 18 A and a maximum repetitive peak reverse voltage of 45 V. The device supports junction temperatures up to 175 °C, with a typical forward voltage drop of 0.53 V at 18 A and 125 °C. Maximum non-repetitive surge current reaches 1800 A for 5 µs pulses. Thermal resistance from junction to case is 1.50 °C/W under DC operation.
Feature Summary
- Optimized for low reverse leakage current at elevated temperatures using proprietary barrier technology
- Guard ring structure provides enhanced ruggedness and long-term reliability
- High purity epoxy encapsulation ensures mechanical strength and moisture resistance
- Qualified for automotive Q101 standards
Applications
- Switching power supplies
- Converters
- Freewheeling diodes
- Reverse battery protection
Procurement Notes
Verify the specific suffix against the datasheet ordering table to confirm packaging orientation and lead-free status. Confirm that the D2PAK variant matches the required thermal management design. Ensure the 45 V rating aligns with the circuit's peak reverse voltage requirements. Check for any recent revisions to the document number 93950 regarding electrical characteristics.
Selection Notes
Select this component when high-frequency operation and low forward voltage drop are critical for efficiency. The 175 °C junction temperature capability allows for robust performance in thermally constrained environments. Consider the 1.50 °C/W thermal resistance for heatsink calculations. The D2PAK package offers a balance of current handling and surface mount convenience.
Part Context
This part belongs to the Vishay 18TQ...S Schottky rectifier series, which includes variants with different voltage ratings such as 35 V and 40 V. All members share the same 18 A current rating and D2PAK package style. The series is designed for general-purpose high-power applications requiring reliable switching performance.
Replacement Considerations
Direct substitutes within the same series include the 18TQ035S and 18TQ040S if lower voltage ratings are acceptable. Verify pinout compatibility and thermal resistance specifications when considering alternative manufacturers' Schottky rectifiers in the D2PAK package.
FAQ
What is the maximum operating junction temperature?
The maximum junction temperature range is -55 °C to 175 °C.
How does the forward voltage drop vary with temperature?
At 18 A, the forward voltage drop is 0.60 V at 25 °C and decreases to 0.53 V at 125 °C.
What is the typical junction capacitance?
The typical junction capacitance is 1400 pF measured at VR = 5 VDC with a test signal frequency between 100 kHz and 1 MHz.
