HE421A1250

Turn Off Voltage (Min):	1 VDC
Coil Resistance:	960 Ohms
Coil Power:	--
Contact Material:	--
Operating Temperature:	-40°C ~ 85°C
Termination Style:	PC Pin
Mounting Type:	Through Hole
Features:	--
Release Time:	1ms
Operate Time:	1ms
Series:	400
Turn On Voltage (Max):	8.5 VDC
Switching Voltage:	200VDC - Max
Contact Rating (Current):	500mA
Contact Form:	SPST-NO (1 Form A)
Coil Voltage:	12VDC
Coil Current:	12.5mA
Coil Type:	Non Latching
Part Status:	Obsolete
Packaging:	Tube

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Reed Relays and the HE421A1250 Application Field and Working Principle

Reed relays are a type of solid-state switching device mainly used to control UHF or VHF signals. Designed to be used in low-power signals, they are often used in telecommunications systems, communication equipment, and other applications.Reed relays are small, mechanically operated relays, and thus differs from other types of relays, which are typically electromechanical and require a separate power supply. Unlike relays, reed relays are noiseless, very low power consuming, and can operate for many years without performance degradation. These characteristics make them ideal for sensitive applications where small signals must be reliably switched without introducing noise.The HER421A1250 is a type of reed relay that is mainly used in telecommunications and test & measurement applications. It is available in a compact, two-pin, pluggable package and is compatible with many connectors. It has an impedance of 1200 ohms and can support both AC and DC signals.The HER421A1250 is designed with a sealed magnetic reed switch, which is why it can be used in direct contact with the contactor. It also has a unique circuit topology that prevents contact chatter, increases its electrical life, and minimizes transient switching.The HER421A1250 works by sensing the presence of a magnetic field. When this field is detected, the HER421A1250 activates its internal contacts and closes the circuit. This allows it to switch high frequencies without introducing noise. The HER421A1250 can also control low-level signals and works on 5-50V DC.The HER421A1250 reed relay is commonly used in telecom switching systems, cellular base stations, and mobile phone repair, as well as in test and measurement equipment. It is designed to provide economical yet reliable switching performance and can also be used for general purpose switching applications.The HER421A1250 reed relay is highly reliable and comes with a long operational life, thanks to its contactless operation. This assurance combined with its compact size, compatibility with most connectors, and its affordability has made it popular in different applications.In conclusion, the HER421A1250 reed relay is ideal for low-power signal applications, such as those found in communication and test and measurement equipment. Its small size, reliable operation, and affordability make it a popular choice for many users.

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