Overview
The 1SMA28AT3G is a Transient Voltage Suppressor (TVS) diode produced by Littelfuse Inc. This component is designed to protect voltage-sensitive components from high voltage and high energy transients. It features excellent clamping capability, high surge capability, low zener impedance, and a fast response time, making it ideal for various industrial and consumer applications.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Peak Power Dissipation @ TL = 25°C, Pulse Width = 1 ms | PPK | 400 | W |
| DC Power Dissipation @ TL = 75°C | PD | 1.0 | W |
| Thermal Resistance from Junction to Lead | RJL | 50 | °C/W |
| Forward Surge Current @ TA = 25°C | IFSM | 40 | A |
| Operating and Storage Temperature Range | TJ, Tstg | -65 to +150 | °C |
| Maximum Reverse Peak Pulse Current | IPP | 8.8 A (10/1000 µs) | A |
| Clamping Voltage @ IPP | VC | 45.4 V | V |
| Working Peak Reverse Voltage | VRWM | 28 V | V |
| Breakdown Voltage @ IT | VBR | 31.1 V | V |
| ESD Rating | Class 3 (> 16 kV) per Human Body Model |
Key Features
- Excellent clamping capability and high surge capability.
- Low zener impedance and fast response time (typically < 1 ns).
- 400 W peak power dissipation at 1 ms pulse width.
- ESD rating of Class 3 (> 16 kV) per Human Body Model.
- Flat handling surface for accurate placement and low profile package.
- Pb-free device with corrosion-resistant external surfaces and readily solderable leads.
Applications
- Communication systems.
- Automotive systems (e.g., power window control, seat adjustments, door lock actuators, windshield wipers).
- Numerical controls and process controls.
- Medical equipment and business machines.
- Power supplies and various industrial/consumer applications.
- Robots, electric scooters, and bikes.
- Home automation systems (e.g., smart home devices, security cameras, door locks).
Q & A
- What is the peak power dissipation of the 1SMA28AT3G? The peak power dissipation is 400 W at a pulse width of 1 ms.
- What is the ESD rating of the 1SMA28AT3G? The ESD rating is Class 3 (> 16 kV) per Human Body Model.
- What is the operating temperature range of the 1SMA28AT3G? The operating temperature range is -65°C to +150°C.
- What is the clamping voltage of the 1SMA28AT3G? The clamping voltage is 45.4 V at the maximum reverse peak pulse current.
- Is the 1SMA28AT3G Pb-free? Yes, the 1SMA28AT3G is a Pb-free device.
- What are the typical applications of the 1SMA28AT3G? Typical applications include communication systems, automotive systems, numerical and process controls, medical equipment, and various industrial/consumer applications.
- What is the package type of the 1SMA28AT3G? The package type is DO-214AC (SMA).
- What is the forward surge current rating of the 1SMA28AT3G? The forward surge current rating is 40 A at TA = 25°C.
- How is the polarity indicated on the 1SMA28AT3G? The polarity is indicated by a molded polarity notch on the cathode side.
- What is the thermal resistance from junction to lead for the 1SMA28AT3G? The thermal resistance from junction to lead is 50 °C/W.
