HE721A24 - Reed Relay in Dual-In-Line (DIP) Package Series

Series: HE700
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Miniature reed relay in a dual-in-line (DIL) package with a choice of normally open, normally open high-voltage, normally closed or changeover contacts capable of switching up to 300Vdc at 10W. Available with 5V, 12V and 24V coils and diode suppression. Magnetic shield option available. Ideally suited for security, telecom, instrumentation, process control and industrial applications.


  • Miniature dual-in-line (DIL) package
  • Optional coil suppression diode is available to protect coil drive circuits
  • Available with normally open contacts
  • External magnetic shield option available


  • One relay, various contact choices help to reduce space and cost without compromising flexibility
  • Lower coil power consumption than electromechanical devices
  • Hermetically sealed switching contacts are immune to their environment
  • Transfer molded package gives maximum component protection


  • Security systems
  • Telecom equipment
  • Process control systems
  • Industrial equipment
  • Instrumentation

cRUicon CUR_NRNT8_E47258

uricon UR_NRNT2_E47258

pdficon Littelfuse Reed Relays HE700 datasheet

pdficon Inductive Load Arc Suppression Application Note

When a reed switch or reed sensor is used to control an inductive device (relay coil solenoid transformer small motor etc.)

pdficon Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary

pdficon Vibration Testing and Precautions Application Note

Littelfuse tests sinusoidal vibration according to Mil. Std. 202G Method 204D Test Condition G (10 ? 2000 Hz frequency sweep at 30 G or 0.06 inch double amplitude whichever is less).

pdficon Capacitive Loads Application Note

When there is significant capacitance in a reed sensor reed relay or reed switch circuit the peak current and energy switched by the reed contacts should be considered.

pdficon Reed Switch Extended Shock Capabilities Application Note

The maximum shock specifications in the Littelfuse catalog are very conservative for most switches smaller than the DRxxxx type. T

pdficon Handling of Reed Sensors Relays And Switches Application Note

When used within their capabilities Littelfuse reed sensors reed relays and reed switches provide many years of robust performance

pdficon Measuring Reed Switch Sensitivity and Contact Resistance Application Note

The purpose of this application note is to document the preferred method of reading the sensitivity and contact resistance of Littelfuse reed switches.

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
HE721A2410 HE721A2410 REED RELAY RoHS No 05/27/2018 PbFree No 05/27/2018 CoC_RoHS9_HE721A2410 REACH181_Declaration_HE721A2410 No
Does not Contain
HE721A2400 HE721A2400 REED RELAY RoHS No 05/27/2018 PbFree No 05/27/2018 CoC_RoHS10_HE721A2400 REACH_SVHC Declaration_HE721A2400 No
Does not Contain
HE721A2430 HE721A2430 RoHS No 05/27/2018 PbFree No 05/27/2018 No
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