1. Device Overview:

· Series: U1ZB3.3 - U1ZB390
· Type: Surface Mount Zener Diode
· Package: DO-214AC (SMA) – A common, small surface-mount package.
· Quantity per Package: 5000 diodes per Tape & Reel.

2. Zener Voltage Options & Electrical Characteristics (Key Data):

The datasheet lists nominal Zener voltages from 3.3V up to 390V. Here's a table summarizing a few key values, along with extracted data. Note: The table isn't exhaustive, but captures the main points. "VR" denotes Zener Voltage. "IF" is Forward Current, "IR" is Reverse Current. "ZZT" is Zener Impedance.

Device	VR (V) (Nominal)	VR (Min) (V)	VR (Typ) (V)	VR (Max) (V)	IF (mA)	IR (μA)	ZZT (Ω)
U1ZB3.3	3.3	N/A	3.3	N/A	N/A	N/A	N/A
U1ZB180	180	162	180	198	1.5	255	5000
U1ZB200	200	180	200	220	0.5	269	220
U1ZB220	220	198	220	242	0.5	309	5000
U1ZB300	300	270	300	330	0.5	428	5000
U1ZB330	330	297	330	363	0.5	470	5000
U1ZB390	390	351	390	429	0.5	555	10000

Important Notes on Electrical Characteristics:

· VR Range: Each Zener diode has a minimum and maximum Zener Voltage range. The "Typ" (typical) value is often used for design calculations.
· Forward Current (IF): Represents the current when the diode is forward-biased.
· Reverse Current (IR): Represents the small leakage current when the diode is reverse-biased.
· Zener Impedance (ZZT): Represents the impedance of the diode at the Zener voltage.
· "X","Y","Z" variants exist within some of the main voltage options; with slight differences in the electrical characteristics.



3. Package Information:

· Package Type: DO-214AC (SMA)
· Dimensions: The datasheet provides detailed dimensional outlines for the DO-214AC package in millimeters (mm). These are crucial for PCB layout and footprint design.
· Footprint: Includes a "Soldering Footprint" diagram.
· Marking Code: A code is applied to the device for identification.

4. Other Important Considerations:

· Temperature Coefficient of Zener Voltage: The datasheet mentions this, but doesn's provide specific values. This indicates how much the Zener voltage changes with temperature.
· Operating Temperature: The datasheet doesn't list specific operating temperature ranges. You would generally assume standard commercial ranges unless otherwise stated in other documentation.
· Test Conditions: Data is typically measured under specific test conditions (e.g., voltage, temperature).

In short, this is a comprehensive datasheet for a range of SMA surface-mount Zener diodes, providing voltage options, package details, and essential electrical characteristics for engineers designing circuits.