{"product_id":"10pcs-hfd4-smd-dip-signal-relay-3v-5v-12v-24v-variants","title":"10pcs HFD4 SMD DIP Signal Relay – 3V 5V 12V 24V Variants","description":"\u003ch2\u003eHFD4 Series SMD \u0026amp; DIP Signal Relays – 10-Piece Pack\u003c\/h2\u003e\n\u003cp\u003eStock your workbench with this convenient 10-piece assortment of \u003cstrong\u003eHFD4 series signal relays\u003c\/strong\u003e, available in both SMD (surface-mount) and DIP (through-hole) configurations. Compatible models include \u003cstrong\u003eHFD4\/3-SR, HFD4\/4.5-SR, HFD4\/5-SR, HFD4\/9-SR, HFD4\/12-SR, and HFD4\/24-SR\u003c\/strong\u003e, making this pack ideal for electronics engineers, hobbyists, and repair technicians who need reliable switching components across a range of coil voltages.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Range:\u003c\/strong\u003e Available in 3V, 4.5V, 5V, 9V, 12V, and 24V coil voltage options to suit diverse circuit designs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD \u0026amp; DIP Packages:\u003c\/strong\u003e Choose surface-mount or through-hole variants depending on your PCB layout requirements\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeneral Purpose Use:\u003c\/strong\u003e Suitable for signal switching, automation circuits, consumer electronics, and control boards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternational Standard Compliance:\u003c\/strong\u003e Built to internationally recognised contact load, protection, and operating standards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10-Piece Quantity:\u003c\/strong\u003e Generous pack size ensures you have spares on hand for prototyping or production runs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo High-Concern Chemicals:\u003c\/strong\u003e Clean construction with no restricted or hazardous substances of concern\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModels Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHFD4\/3-SR, HFD4\/4.5-SR, HFD4\/5-SR, HFD4\/9-SR, HFD4\/12-SR, HFD4\/24-SR\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSMD \/ DIP (through-hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Voltages\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3V, 4.5V, 5V, 9V, 12V, 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 pieces per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGeneral Purpose Signal Switching\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThese relays are a go-to component for \u003cstrong\u003ePCB designers, electronics repair professionals, and DIY enthusiasts\u003c\/strong\u003e working on automation systems, microcontroller projects, signal routing boards, and more. Whether you're prototyping a new design or restocking your components drawer, this 10-piece HFD4 relay pack offers excellent versatility and value.\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between the SMD and DIP versions of the HFD4 relay?\u003c\/h4\u003e\n\u003cp\u003eA: The SMD (surface-mount device) version is designed to be soldered directly onto the surface of a PCB without through-holes, making it ideal for compact, automated assembly processes. The DIP (dual in-line package) version uses through-hole pins that are inserted into the board and soldered on the underside, which is often preferred for hand-soldering, prototyping, or applications where mechanical strength is important.\u003c\/p\u003e\n\u003ch4\u003eQ: Which coil voltage should I choose for my circuit?\u003c\/h4\u003e\n\u003cp\u003eA: Select the coil voltage (3V, 4.5V, 5V, 9V, 12V, or 24V) that matches your circuit's control voltage supply. For microcontroller-driven circuits, 3V or 5V variants are most common. For industrial or automotive control boards, 12V or 24V versions are typically more appropriate. Always verify your power supply and control signal levels before selecting a model.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these HFD4 relays compatible with standard PCB footprints?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the HFD4 series follows internationally recognised standard footprints, making them compatible with most PCB designs that call for this relay family. Always double-check the specific model's datasheet dimensions against your PCB layout to ensure a perfect fit.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use these relays for both prototyping and production?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The 10-piece pack is well-suited for both prototyping new circuit designs and small production runs. The inclusion of multiple voltage variants in one purchase gives engineers the flexibility to test different configurations without needing to source components separately.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between the SMD and DIP versions of the HFD4 relay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The SMD (surface-mount device) version is designed to be soldered directly onto the surface of a PCB without through-holes, making it ideal for compact, automated assembly processes. 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