1. Device Description & Types

️· Device: Zener Diode
️· Series: CDI Diodes - Specific part numbers include 1N5518BUR-1 through 1N5546BUR-1, and CDLL5518 through CDLL5546D.
️· Variants: Devices are categorized by suffix indicating tolerance:
- No Suffix: +20% tolerance (limited parameters)
- "A" Suffix: +10% tolerance (limited parameters)
- "B" Suffix: +5.0% tolerance (guaranteed limits for key parameters)
- "C" Suffix: +2.0% tolerance
- "D" Suffix: +1.0% tolerance
️· Polarity: Band indicates the cathode (positive) end.

2. Electrical Characteristics (Key Values - see full table within the document)

️· Zener Voltage (VZ): Varies depending on the specific part number (CDLL5518 to CDLL5546D) - see full table.
️· Reverse Leakage Current (IR): Varies depending on part number - see full table.
️· Forward Voltage (VF): Guaranteed limits for "B", "C", and "D" suffix parts.
️· Zener Impedance: Shown graphically vs. Operating Current (Figure 3).
️· Operating Current (IZT): Graphically represented in Figure 3.

3. Physical Characteristics

️· Case Style: DO-213AA (MELF, SOD-80, LL34)
️· Lead Finish: Tin / Lead
️· Thermal Resistance (RθJC): 100 °C/W maximum
️· Thermal Impedance (ZOJ X): 35 °C/W maximum
️· Dimensions (in millimeters and inches):
- D: 1.60 - 1.70 mm / 0.063 - 0.067 in
- F: 0.41 - 0.55 mm / 0.016 - 0.022 in
- G: 3.30 - 3.70 mm / .130 - .146 in
- G1: 2.54 REF. / .100 REF.
- S: 0.03 MIN. / .001 MIN.

4. Thermal & Mounting Information

️· Coefficient of Expansion (COE): +6 PPM/°C - suggests matching mounting surface COE for stability.
️· Power Derating Curve: Graphically shown in Figure 2 – shows how maximum power dissipation changes with temperature.

5. Contact Information

️· Company: CDI Diodes
️· Address: 22 Corey Street, Melrose, Massachusetts 02176
️· Phone: (781) 665-1071
️· Fax: (781) 665-7379
️· Website: http://www.cdi-diodes.com
️· Email: mail@cdi-diodes.com



To fully understand the device's operation, refer to the full tables included in the document, specifically focusing on the specific part numbers you're interested in.