Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.MMBZ5221B - MMBZ5257B Zener Diodes November 2015 MMBZ5221B - MMBZ5257B Zener Diodes Tolerance = 5% CONNECTION 3 DIAGRAM 3 2 1 1 2 NC SOT-23 (1, 2) Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at T = 25C unless otherwise noted. A Symbol Parameter Value Unit Referencing R , T = 25C 250 JA A P Power Dissipation mW D Referencing , T = 25C 550 JL L (3) R Junction-to-Ambient Thermal Resistance 465 C/W JA Junction-to-Lead Thermal Characteristics 220 C/W JL (with reference to Cathode) T Storage Temperature Range -55 to +150 C STG T Operating Junction Temperature +150 C J Note: 1.These ratings are based on a maximum junction temperature of 150C. 2.These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations. 3. Device mounted on FR-4 PCB, board size = 76.2 mm x 114.3 mm 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com MMBZ5221B - MMBZ5257B Rev. 1.5