ER421 Datasheet | Teledyne Technologies

DESCRIPTION The magnetic-latching TO-5 relay, originally conceived and developed by Teledyne, has bee 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 ranges well into the UHF spectrum. A typical RF application for this TO-5 relay is in handheld radio transceivers, wherein the bined Features of good RF performance, small size, low coil power dissipation and high reliability make it a preferred method of transmit-receive switching (see Figure 1). The Series 421 magnetic-latching relays are ideally suited for applications where coil power dissipation must be minimized. The relays can be operated with a short duration pulse. After the contacts have transferred, no external holding power is required. The magnetic latching feature of the Series 421 provides a “memory” capability, since the relays will not reset upon removal of coil power. PERMANENT MAGNET MAGNETIC CIRCUIT A SOFT IRON CORE A PRINCIPLE OF OPERATION MAGNETIC CIRCUIT B Energizing Coil B...