1. Product Overview:

️· Device Type: 1.5KE series TVS diodes. These are used to protect circuits from voltage transients (sudden spikes) like those caused by lightning, ESD (electrostatic discharge), or inductive switching.
️· Variants: The document covers both unidirectional and bidirectional versions.
️· Voltage Range: The datasheet covers a wide range of standoff voltages (VBR) from 200V to 440V.

2. Key Electrical Characteristics (Important Parameters):

️· VBR (Breakdown Voltage): The voltage at which the diode starts to conduct significantly, clamping the voltage.
️· Ipp (Peak Pulse Current): The maximum current the diode can handle for a single pulse.
️· Ppp (Peak Pulse Power): The maximum power the diode can dissipate during a pulse.
️· VRRM (Repetitive Reverse Voltage): Maximum repetitive reverse voltage.
️· αT (Temperature Coefficient): How much the breakdown voltage changes with temperature. A critical parameter for understanding how performance shifts with operating conditions.
️· Capacitance (C): Important for high-frequency applications, as it affects impedance.

3. Performance Graphs & Figures:

The datasheet includes numerous graphs illustrating:

️· Peak Pulse Power Dissipation vs. Junction Temperature: Shows how the maximum power handling capability decreases as the diode gets hotter.
️· Clamping Voltage vs. Peak Pulse Current: Shows the clamping behavior of the diode—how much it limits the voltage for a given pulse current.
️· Capacitance vs. Reverse Voltage: Indicates how capacitance changes with the applied reverse voltage.
️· Transient Thermal Impedance: Shows how the diode's temperature rises during a pulse.
️· Leakage Current vs. Junction Temperature

4. Packaging & Mechanical Data:

️· Package Type: DO-201 (Plastic)
️· Dimensions: Detailed mechanical drawings and dimensions of the DO-201 package are provided.
️· Weight: Approximately 0.876g
️· Packaging: Supplied in tape and reel.

5. Important Notes & Cautions:

️· Temperature Effects: The datasheet emphasizes the importance of considering temperature when designing with these diodes.
️· Repetitive Stress: The diodes are designed for transient events, not continuous high voltage or current.
️· Life Support Applications: The diodes are not intended for use as critical components in life support devices without explicit approval from STMicroelectronics.



In essence, this datasheet provides all the necessary information for an engineer to select, design with, and understand the performance characteristics of STMicroelectronics' 1.5KE series TVS diodes.