1. Device Identification & Overview

️· Product Family: CDLL5221B through CDLL5272B (a series of Zener diodes)
️· Type: Zener diodes – likely used for voltage regulation.
️· Manufacturer: CDI Diodes
️· Website: http://www.cdi-diodes.com
️· Contact: (781) 665-1071 / (781) 665-7379
️· Location: 22 Corey Street, Melrose, Massachusetts 02176

2. Electrical Characteristics (Key Parameters - From the Table)

️· Zener Voltage: The primary characteristic. The table lists Zener voltages for each device in the series, ranging approximately from 16V to 110V (and 100V in CDLL5272B).
- Note 1: Suffixes indicate tolerance/variation:
■ "-B": +5.0%
■ "-A": +10%
■ No suffix: +20%
■ "-C": +2%
■ "-D": +1%
️· Test Current (IzT): Also varies for each device, ranging from 0.1mA to 7.8mA. This is the current used to measure the Zener voltage.
️· Zener Impedance: Varies with the test current. Graphically shown in Figure 3.
️· Reverse Breakdown Voltage: Listed for CDLL5266B, CDLL5267B, CDLL5268B, CDLL5269B, CDLL5270B and CDLL5272B
️· Forward Voltage: Listed for CDLL5266B, CDLL5267B, CDLL5268B, CDLL5269B, CDLL5270B and CDLL5272B

3. Physical Characteristics & Packaging

️· Case Style: DO-213AA (also referenced as Hermetically sealed glass case. (MELF, SOD-80, LL34)
️· Lead Finish: Tin / Lead (potentially outdated – lead content is increasingly regulated)
️· Dimensions (in mm & inches): (Table shows dimensions)
- D (Body Length): 1.60 - 2.70 mm
- F (Body Width): 0.41 - 0.55 mm
- G (Lead Length): 3.30 - 3.70 mm
- G1 (Lead Spacing): 2.54 mm
- S (Lead Spread): 0.03 mm
️· Polarity: Band indicates the cathode (positive) side of the diode.

4. Thermal Characteristics

️· Thermal Resistance (RθJC): 100 °C/W maximum (at L = 0 inch). Indicates how much the temperature rises for a given power dissipation.
️· Thermal Impedance (ZθJC): 35 °C/W maximum.
️· Coefficient of Thermal Expansion (CTE): +6 PPM/°C. Important for mounting considerations.

5. Figures & Diagrams

️· Figure 1: Shows device dimensions.
️· Figure 3: Shows the Zener Impedance vs. Operating Current.
️· Design Data Section: General mounting and thermal data.

Important Notes/Considerations:

️· Lead Content: The lead finish information suggests this datasheet may be older. Modern electronics often require lead-free components.
️· Thermal Management: The thermal resistance and impedance values, as well as the CTE, should be considered during circuit board design and component placement.
️· Mounting: The CTE is a critical mounting factor.