HE700 Series - Reed Relay in Dual-In-Line (DIP) Package

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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 and 140Vac at 10VA. 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

Access specifications, certifications, check availability and order parts below

Catalog #Coil VoltageCoil ResistanceSwitching Voltage (V DC)Switching Current (A DC)Switching Power (W)Switch TypePartner ECAD ModelsStockSamplesCompare

pdf icon Sensing Products Selection Guide

This guide provides an introduction to magnetic sensing and options for value-added custom design packages.

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 Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary

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 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 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.

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 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).

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
HE721A2410 HE721A2410 REED RELAY RoHS No 05/27/2018 PbFree No 05/27/2018 CoC_RoHS9_HE721A2410_05-28-2018 No
HE721A2400 HE721A2400 REED RELAY RoHS No 05/27/2018 PbFree No 05/27/2018 CoC_RoHS10_HE721A2400_09-07-2018 REACH201_Declaration_HE721A2400_9-30-2019 No
Does not Contain
HE721A2430 HE721A2430 RoHS No 05/27/2018 PbFree No 05/27/2018 No
HE721B0510 HE721B0510 RELAY RoHS No 04/19/2018 PbFree No 04/19/2018 CoC_RoHS9_HE721B0510_04-20-2018 No
HE721C0510 HE721C0510 RELAY RoHS No 09/19/2017 PbFree No 09/19/2017 CoC_RoHS9_HE721C0510_09-26-2019 REACH205_Declaration_HE721C0510_04-02-2020
Does not Contain
HE721C0520 HE721C0520 RELAY RoHS No 09/19/2017 PbFree No 09/19/2017
HE721C0530 HE721C0530 REED RELAY RoHS No 09/19/2017 PbFree No 09/19/2017 CoC_RoHS9_HE721C0530_05-13-2021 REACH211_Declaration_HE721C0530_05-13-2021
Does not Contain
HE721C0500 HE721C0500 RELAY RoHS No 09/19/2017 PbFree No 09/19/2017 CoC_RoHS10_HE721C0500_11-05-2019 REACH201_Declaration_HE721C0500_11-05-2019
Does not Contain
HE721C0540 HE721C0540 REED RELAY RoHS No 09/19/2017 PbFree No 09/19/2017
HE722A0510 HE722A0510 REED RELAY RoHS No 04/19/2018 PbFree No 04/19/2018 CoC_RoHS9_HE722A0510_04-24-2019 No
HE722A0530 HE722A0530 REED RELAY RoHS No 04/19/2018 PbFree No 04/19/2018 No
HE722A0500 HE722A0500 REED RELAY RoHS No 04/19/2018 PbFree No 04/19/2018 CoC_RoHS10_HE722A0500_12-12-2019 REACH201_Declaration_HE722A0500_12-12-2019 No
Does not Contain
HE722A1210 HE722A1210 REED RELAY RoHS No 03/11/2020 PbFree No 03/11/2020 CoC_RoHS9_HE722A1210_03-11-2020 REACH205_Declaration_HE722A1210_03-11-2020
Does not Contain
HE722A1250 HE722A1250 REED RELAY RoHS No 03/11/2020 PbFree No 03/11/2020
HE722A1200 HE722A1200 REED RELAY RoHS No 03/11/2020 PbFree No 03/11/2020 CoC_RoHS10_HE722A1200_04-13-2020 REACH205_Declaration_HE722A1200_04-13-2020
Does not Contain
HE751A0500 HE751A0500 REED RELAY RoHS No 01/26/2016 PbFree No 01/26/2016 CoC_RoHS10_HE751A0500_10-18-2019 REACH201_Declaration_HE751A0500_10-18-2019 No
Does not Contain
HE751A0510 HE751A0510 RELAY RoHS No 01/26/2016 PbFree No 01/26/2016 CoC_RoHS9_HE751A0510_10-01-2019 REACH201_Declaration_HE751A0510_10-1-2019 No
Does not Contain
HE751A1210 HE751A1210 REED RELAY RoHS No 12/20/2019 PbFree No 12/20/2019 CoC_RoHS9_HE751A1210_03-05-2021 REACH211_Declaration_HE751A1210_03-05-2021 No
Does not Contain
HE751A1200 HE751A1200 RoHS No 12/20/2019 PbFree No 12/20/2019 CoC_RoHS10_HE751A1200_10-31-2019 REACH201_Declaration_HE751A1200_10-31-2019 No
Does not Contain
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