ER421DD

www.DataSheet4U.com SERIES MAGNETIC-LATCHING ESTABLISHED RELIABILITY TO-5 RELAYS SPDT SERIES DESIGNATION 421 421D 421DD SPDT basic relay SPDT relay with internal diode for coil transient suppression SPDT relay with internal diodes for coil transient suppression and polarity reversal protection RELAY TYPE 421 DESCRIPTION The magnetic-latching TO-5 relay, originally conceived and developed by Teledyne, has become one of the industry standards for low-level switching from dry circuit to 0.5 ampere. Designed for high-density PC board mounting, its small size and low coil power dissipation make the 421 relay one of the most versatile ultraminiature relays available. The following unique construction features and manufacturing techniques provide excellent resistance to environmental extremes and overall high reliability: All welded construction. Unique uni-frame design providing high magnetic efficiency and mechanical rigidity. High force/mass ratios for resistance to shock and vibration. Advanced cleaning techniques provide maximum assurance of internal cleanliness. Precious metal alloy contacts material with gold plating assures excellent high current and dry circuit switching capabilities. The Series 421D and 421DD utilize discrete silicon diodes for coil suppression and polarity reversal protection. By virtue of its inherently low intercontact capacitance and contact circuit losses, the 421 relay has proven to be an excellent ultraminiature RF switch for frequency...