What Is the HK4100F? Small SPDT Relay: Specs and Uses
The HK4100F is a small-size SPDT electromechanical relay. It comes in 5 V or 12 V coil versions; it switches ~3 A (COM/NO/NC). It is favoured on tight boards. An MCU cannot drive the coil directly → a transistor (2N2222) + flyback diode (1N4007) are needed; choose the correct coil voltage.
The HK4100F is a small-size SPDT electromechanical relay. Its low profile makes it a favourite on tight boards; it comes in 5 V or 12 V coil versions. For the concept, see what is a relay.
What is the HK4100F used for?
Medium-current load switching on small boards (relay modules, home automation, instruments). Contacts are COM/NO/NC; it is smaller than the SRD series and usually lower current (~3 A).
Watch out
Same rules as the SRD: an MCU cannot drive the coil directly → a transistor (2N2222) + flyback diode (1N4007). Choose the correct coil voltage (5 V or 12 V).
Specifications
| Parameter | Value |
|---|---|
| Type | Small SPDT relay |
| Coil | 5 V / 12 V DC |
| Contact | ~3 A |
Equivalents
- SRD-05VDC: a higher-current (10 A) relay.
- G5V-1: a low-power signal relay.
- JQC-3F (T73): a common PCB relay.
Find it in our catalog
Use the HK4100F search.