HE3621A05 - HE3600 Series

Series: HE3600
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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 single-in-line (SIL) package with a choice of normally open or data switching contacts capable of switching up to 200Vdc at 10W. Available with 5V, 12V and 24V coils and has external magnetic shield and diode-suppressed coil options. Ideally suited for telecom, instrumentation, process control and industrial applications. Data switching contacts are especially recommended for automatic test equipment (ATE) applications.


  • Miniature single-in-line (SIL) package
  • Optional coil suppression diode is available to protect coil drive circuits
  • Available with normally open contacts
  • Available in specialist ATE version
  • External magnetic shield option available


  • Sub-miniature size and single-in-line configuration allows very high packing densities, minimizing space and cost
  • Designed specifically to meet the requirements of the ATE environment
  • 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
  • Automatic test equipment
  • Instrumentation

HE3621A05 ECAD Models

curus cUR_NRNT8_E47258_100213036

UR UR_NRNT2_E47258_100213036

pdf icon PIR motion detector

pdf icon Sensing Products Selection Guide

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

pdf icon 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.

pdf icon Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary

pdf icon 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

pdf icon 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.)

pdf icon 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.

pdf icon 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

pdf icon 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)
HE3621A0500 HE3621A0500 REED RELAY RoHS No 03/16/2015 PbFree No 03/16/2015 CoC_RoHS10_HE3621A0500_11-18-2019 REACH209_Declaration_HE3621A0500_12-09-2020 No
Does not Contain
HE3621A0510 HE3621A0510 REED RELAY RoHS No 03/16/2015 PbFree No 03/16/2015 CoC_RoHS9_HE3621A0510_8-27-2019 REACH211_Declaration_HE3621A0510_02-17-2021 No
Does not Contain
HE3621A0540 HE3621A0540 RoHS No 03/16/2015 PbFree No 03/16/2015 CoC_RoHS10_HE3621A0540_11-18-2019 REACH201_Declaration_HE3621A0540_11-18-2019 No
Does not Contain
HE3621A0550 HE3621A0550 RELAY RoHS No 03/16/2015 PbFree No 03/16/2015 No
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