10pcs HFD4 SMD DIP Signal Relay – 3V 5V 12V 24V Variants

HFD4 Series SMD & DIP Signal Relays – 10-Piece Pack

Stock your workbench with this convenient 10-piece assortment of HFD4 series signal relays, available in both SMD (surface-mount) and DIP (through-hole) configurations. Compatible models include HFD4/3-SR, HFD4/4.5-SR, HFD4/5-SR, HFD4/9-SR, HFD4/12-SR, and HFD4/24-SR, making this pack ideal for electronics engineers, hobbyists, and repair technicians who need reliable switching components across a range of coil voltages.

Made in Mainland China.

Key Features

• Wide Voltage Range: Available in 3V, 4.5V, 5V, 9V, 12V, and 24V coil voltage options to suit diverse circuit designs
• SMD & DIP Packages: Choose surface-mount or through-hole variants depending on your PCB layout requirements
• General Purpose Use: Suitable for signal switching, automation circuits, consumer electronics, and control boards
• International Standard Compliance: Built to internationally recognised contact load, protection, and operating standards
• 10-Piece Quantity: Generous pack size ensures you have spares on hand for prototyping or production runs
• No High-Concern Chemicals: Clean construction with no restricted or hazardous substances of concern

Specifications

Who Is This For?

These relays are a go-to component for PCB designers, electronics repair professionals, and DIY enthusiasts 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.

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Frequently Asked Questions

Q: What is the difference between the SMD and DIP versions of the HFD4 relay?

A: 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.

Q: Which coil voltage should I choose for my circuit?

A: 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.

Q: Are these HFD4 relays compatible with standard PCB footprints?

A: 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.

Q: Can I use these relays for both prototyping and production?

A: 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.