1. Overview:

· Product Type: Zener Diodes. These are diodes designed to operate in reverse breakdown, maintaining a stable voltage across them when the reverse voltage exceeds a certain level (the Zener voltage).
· Series: U1ZB6.8 - U1ZB390. This signifies a range of Zener voltages, starting at 6.8V and going up to 390V.
· Manufacturer: Galaxy (implied by the "BL GALAXY ELECTRICAL" mentions).
· Document Type: Datasheet. This provides technical specifications, ratings, characteristics, and application guidelines.
· Document Number: 0284025. Used for reference and revision tracking.

2. Key Specifications (from the tables – important values):

The core of the datasheet lies in the tables listing the specifications for each diode within the series. Here are the primary parameters and how to interpret them. (Note: The tables are complex to fully extract all values. I will focus on providing the format and key features.)

· Zener Voltage (Vz): This is the primary characteristic. It's the reverse voltage at which the diode begins to conduct in reverse breakdown. (e.g., U1ZB6.8 has a Zener voltage of 6.8V, U1ZB390 has a Zener voltage of 390V.)
· Zener Impedance (Z): This specifies the internal resistance of the diode. The lower this is, the more easily current flows during the Zener breakdown state.
· Temperature Coefficient (αT): This indicates how much the Zener voltage changes with temperature. A lower αT means the Zener voltage is more stable with changes in temperature. It's expressed in mV/°C.
· Maximum Power Dissipation (Pmax): This defines the maximum amount of power the diode can handle without being damaged.
· Maximum Forward Current (If): The maximum current the diode can handle when operating in the forward direction.
· Reverse Breakdown Voltage: The Voltage at which Zener Breakdown is occurring.

3. Figures and Graphs (important aspects):

· FIG.1: AT YZ - VZ This is likely a graph showing the temperature coefficient of the Zener voltage, plotted against the Zener voltage. It provides a visual representation of how the stability of the Zener voltage changes across the series.
· Rectangular Waveform PRSM TW: Shows recommended pulse waveform parameters and limitations. This helps determine how these diodes can be used in pulsed circuits. It likely shows maximum voltage and current limits for rectangular pulse signals.

4. Important Considerations:

· Operating Conditions: The datasheet details the operating conditions for the diodes, including ambient temperature limits and maximum ratings for voltage and current.
· Application Guidelines: The datasheet includes recommendations for circuit design and application.
· Pulse Waveform: The rectangular waveform graph and associated data are critical for applications involving pulsed voltage or current. Exceeding the pulse limits can damage the diode.
· Safety: Proper heat sinking and derating may be required when operating the diodes near their maximum ratings.



How to use this information:

1. Select the right Zener Voltage: Choose a Zener diode whose Zener voltage matches the voltage you need to regulate or clamp.
2. Check Power Dissipation: Ensure the diode's power dissipation rating is sufficient for the application's power requirements.
3. Consider Temperature Stability: If the application is subject to significant temperature variations, choose a diode with a low temperature coefficient.
4. Follow Pulse Ratings: If the Zener diode will be used in a pulsed circuit, make sure that the pulse parameters (voltage, current, pulse width) are within the datasheet's specifications.

Disclaimer:

*This is an interpretation based on the provided text and images. The complete picture would be gained by referring to the full datasheet, including any supplementary information.*