1N5278B Microchip

1N5221B-1 thru 1N5281B-1 Screening in 500 mW GLASS AXIAL-LEAD reference to Available on MIL-PRF-19500 commercial ZENER DIODES versions available DESCRIPTION The popular 1N5221B-1 thru 1N5281B-1 series of 0.5 watt Zener voltage regulators provides a selection from 2.4 to 200 volts in standard 5% or 10% tolerances as well as tighter tolerances identified by different suffix letters on the part number. These glass, axial-leaded DO-35 Zeners are also available in various up-screening levels by adding a prefix identifier as described in the Part Nomenclature section of this datasheet. Microsemi also offers numerous other Zener products to meet higher and lower power applications. Important: For the latest information, visit our website 1N5221B-1 thru 1N5281B-1 MECHANICAL and PACKAGING CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package. TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (commercial grade only) solderable per MIL-STD-750, method 2026. MARKING: Part number. POLARITY: Cathode indicated by band. Diode to be operated with the banded end positive with respect to the opposite end for Zener regulation. TAPE & REEL option: Standard per EIA-296 (add TR suffix to part number). Consult factory for quantities. WEIGHT: 0.2 grams. See Package Dimensions on last page. PART NOMENCLATURE MQ 1N5221 B -1 (e3) Reliability Level RoHS Compliance MQ (reference JAN) e3 = RoHS Compliant (available MX (reference JANTX) on commercial grade only) MV (reference JANTXV) Blank = non-RoHS Compliant MSP (reference JANS) Blank = Commercial Metallurgically Bonded JEDEC type number (see Electrical Characteristics table) Zener Voltage Tolerance A = 10% B = 5% C = 2% D = 1% SYMBOLS & DEFINITIONS Symbol Definition I Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature. R I , I , I Regulator Current: The dc regulator current (I ), at a specified test point (I ), near breakdown knee (I ). Z ZT ZK Z ZT ZK I Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating. ZM T Temperature Solder Pad: The maximum solder temperature that can be safely applied to the terminal. SP V Reverse Voltage: The reverse voltage dc value, no alternating component. R V Zener Voltage: The Zener voltage the device will exhibit at a specified current (I ) in its breakdown region. Z Z Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a Z or Z ZT ZK specified rms current modulation (typically 10% of I or I ) and superimposed on I or I respectively. ZT ZK ZT ZK T4-LDS-0232, Rev. 1 (111957) 2011 Microsemi Corporation Page 2 of 5