Overview
The ISL9R18120S3ST is a STEALTH™ diode from onsemi, optimized for low loss performance in high frequency hard switched applications. This device is part of the STEALTH family, which is known for its low reverse recovery current (IRR) and exceptionally soft recovery characteristics. These features make it ideal for use as a free wheeling or boost diode in power supplies and other power switching applications. The STEALTH diode is designed to reduce losses in switching transistors and minimize ringing, allowing for operation without additional snubber circuitry. It is particularly recommended for use with SMPS IGBTs to achieve efficient and high power density designs at lower costs.
Key Specifications
| Parameter | Symbol | Ratings | Unit |
|---|---|---|---|
| Repetitive Peak Reverse Voltage | VRRM | 1200 | V |
| Working Peak Reverse Voltage | VRWM | 1200 | V |
| DC Blocking Voltage | VR | 1200 | V |
| Average Rectified Forward Current (TC = 92°C) | IF(AV) | 18 | A |
| Repetitive Peak Surge Current (20 kHz Square Wave) | IFRM | 36 | A |
| Non-repetitive Peak Surge Current (Halfwave 1 Phase 60 Hz) | IFSM | 200 | A |
| Power Dissipation | PD | 125 | W |
| Avalanche Energy (1 A, 40 mH) | EAVL | 20 | mJ |
| Operating and Storage Temperature Range | TJ, TSTG | -55 to +175 | °C |
| Maximum Temperature for Soldering | TL | 300 | °C |
| Thermal Resistance Junction to Case | RθJC | 1.0 | °C/W |
| Thermal Resistance Junction to Ambient (TO-263) | RθJA | 62 | °C/W |
| Instantaneous Forward Voltage (IF = 18 A, TC = 25°C) | VF | 3.3 | V |
| Reverse Recovery Time (IF = 18 A, dIF/dt = 100 A/μs, VR = 30 V) | trr | 300 | ns |
Key Features
- Stealth Recovery with trr = 300 ns (@ IF = 18 A)
- Maximum Forward Voltage, VF = 3.3 V (@ TC = 25°C)
- 1200 V Reverse Voltage and High Reliability
- Avalanche Energy Rated
- Pb-Free and RoHS Compliant
- Low reverse recovery current (IRR) and exceptionally soft recovery
- Reduces loss in switching transistors and minimizes ringing
Applications
- Hard Switched PFC Boost Diode
- UPS Free Wheeling Diode
- Motor Drive FWD
- SMPS FWD
- Snubber Diode
Q & A
- What is the repetitive peak reverse voltage of the ISL9R18120S3ST? The repetitive peak reverse voltage is 1200 V.
- What is the average rectified forward current at 92°C? The average rectified forward current is 18 A.
- What is the maximum power dissipation? The maximum power dissipation is 125 W.
- What is the avalanche energy rating? The avalanche energy rating is 20 mJ.
- What are the operating and storage temperature ranges? The operating and storage temperature ranges are -55 to +175°C.
- What is the thermal resistance junction to case? The thermal resistance junction to case is 1.0 °C/W.
- What is the reverse recovery time at IF = 18 A and dIF/dt = 100 A/μs? The reverse recovery time is 300 ns.
- Is the ISL9R18120S3ST RoHS compliant? Yes, the ISL9R18120S3ST is Pb-Free and RoHS compliant.
- What are some typical applications of the ISL9R18120S3ST? Typical applications include hard switched PFC boost diode, UPS free wheeling diode, motor drive FWD, SMPS FWD, and snubber diode.
- How does the STEALTH diode reduce losses in switching transistors? The STEALTH diode reduces losses in switching transistors through its low reverse recovery current (IRR) and exceptionally soft recovery characteristics.
