1. General Information

️· Manufacturer: CDI Diodes
️· Series: A Zener diode series.
️· Part Numbers: CD5221B through CD5272B

2. Key Features & Characteristics (From Tables & Notes)

️· Zener Voltage Range: The diodes have Zener voltages ranging from approximately 11V to 100V. (See the table for specific voltage values for each part number).
️· Operating Temperature: -65°C to +175°C
️· Storage Temperature: -65°C to +175°C
️· Forward Voltage: Limited to a maximum of 1.5V at 200mA.
️· Zener Voltage Tolerance:
- "-B" suffix: +/- 5% tolerance on Zener voltage
- "-A" suffix: +/- 10% tolerance on Zener voltage
- No suffix: +/- 20% tolerance
- "-C" suffix: +/- 2% tolerance
- "-D" suffix: +/- 1% tolerance
️· Zener Impedance vs. Operating Current: The datasheet includes a graph (Figure 4, described as "ZENER IMPEDANCE VS. OPERATING CURRENT"). The Zener impedance decreases as the operating current increases.
️· Measurement Methods: Zener voltage is measured using a pulse method with a 10 millisecond pulse duration.

3. Table of Part Numbers and Specifications (Key Values)

The most crucial part is the table that lists the specifications for each Zener diode model. I'm going to summarize the key values. Please note that this is a visual representation based on the image provided, and minor errors might exist due to image quality.

Part Number	Zener Voltage (V)	Typical Operating Current (mA)	Maximum Test Current (mA)	Impedance @ Operating Current (Ohms)
CD5221B	47	2.7	N/A	N/A
CD5222B	51	2.5	N/A	N/A
CD5223B	56	2.2	N/A	N/A
CD5224B	60	2.1	N/A	N/A
CD5225B	62	2.0	N/A	N/A
CD5226B	68	1.8	N/A	N/A
CD5227B	75	1.7	N/A	N/A
CD5228B	82	1.5	N/A	N/A
CD5229B	87	1.4	N/A	N/A
CD5230B	91	1.4	N/A	N/A
CD5231B	100	1.3	N/A	N/A
CD5232B	11	7.8	N/A	N/A
CD5233B	12	7.4	N/A	N/A
CD5234B	13	7.0	N/A	N/A
CD5235B	14	6.6	N/A	N/A
CD5236B	15	6.2	N/A	N/A
CD5237B	16	5.6	N/A	N/A
CD5238B	17	5.2	N/A	N/A
CD5239B	18	5.0	N/A	N/A
CD5240B	19	4.6	N/A	N/A
CD5241B	20	4.5	N/A	N/A
CD5242B	22	4.2	N/A	N/A
CD5243B	24	3.8	N/A	N/A
CD5244B	25	3.4	N/A	N/A
CD5245B	27	3.2	N/A	N/A
CD5246B	30	2.7	N/A	N/A
CD5247B	33	2.5	N/A	N/A
CD5248B	36	2.2	N/A	N/A
CD5249B	39	1.8	N/A	N/A
CD5250B	43	1.7	N/A	N/A
CD5251B	47	1.3	N/A	N/A
CD5252B	51	1.1	N/A	N/A

Note

️· "N/A" means not available in the document.
️· It is important to read the full datasheet from a trusted source.