HE3300 Series - Reed Relay in Single-In-Line (SIL) 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 single-in-line (SIL) package with a choice of normally open, normally open high-voltage or changeover contacts capable of switching up to 300Vdc at 10W and 140Vac at 10VA. Available with 5V, 12V and 24V coils and has external magnetic shield options. Ideally suited for security, telecom, instrumentation, process control, industrial and automatic test equipment (ATE) applications.


  • Miniature single-in-line (SIL) package
  • Available with standard 5V, 12V or 24V coil options
  • High-voltage switching version available
  • Normally open and change-over contact configurations available
  • External magnetic shield option available


  • Single-in-line configuration allows high packing densities, minimizing space and cost
  • 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

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

pdficon Littelfuse Reed Relays HE3300 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
HE3321A0400 HE3321A0400 REED RELAY RoHS No 04/26/2016 PbFree No 04/26/2016 CoC_RoHS10_HE3321A0400 REACH_SVHC Declaration_HE3321A0400 No
Does not Contain
HE3321C0500 HE3321C0500 RELAY RoHS No 04/29/2019 PbFree No 04/29/2019 CoC_RoHS10_HE3321C0500 No
HE3321C1200 HE3321C1200 RELAY RoHS No 09/23/2021 PbFree No 09/23/2021 CoC_RoHS10_HE3321C1200 REACH219_Declaration_HE3321C1200 No
Does not Contain
HE3321C2400 HE3321C2400 RELAY RoHS No 09/24/2018 PbFree No 09/24/2018 CoC_RoHS10_HE3321C2400 No
HE3351A1200 HE3351A1200 RoHS No 03/08/2021 PbFree No 03/08/2021 CoC_RoHS10_HE3351A1200 REACH211_Declaration_HE3351A1200 No
Does not Contain
HE3351A2400 HE3351A2400 RoHS No 02/20/2019 PbFree No 02/20/2019 CoC_RoHS10_HE3351A2400 REACH197_Declaration_HE3351A2400 No
Does not Contain
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