HFD4-4.5-SR Signal Subminiature Sealed Surface-Mount SMD Relay 4.5VDC DPDT

The HFD4-4.5-SR is a compact subminiature sealed surface-mount relay designed for reliable signal switching in high-density PCB applications. With a Form 2C (DPDT / 2c/o) contact configuration, it enables control of two independent circuits while maintaining a very small footprint suitable for modern electronic designs.

This relay operates with a 4.5VDC coil voltage and a 145 coil resistance, providing efficient actuation with a maximum switching current of 2A. It is optimized for low-voltage control circuits where stable and repeatable switching performance is required.

The gold flash contacts ensure low contact resistance, excellent conductivity, and long-term reliability, making the relay suitable for sensitive signal and low-power load switching. It supports electrical ratings of 2A at 30VDC and 0.5A at 125VAC (250VAC max), allowing flexible use in both DC and AC applications.

Its sealed SMD construction protects internal components from dust and environmental contamination while enabling automated PCB assembly, making it ideal for mass production and compact electronic systems.

Features

Form 2C (DPDT / 2c/o) contact configuration

Compact sealed surface-mount (SMD) design

4.5VDC coil operation

145 coil resistance

Maximum switching current of 2A

Gold flash contacts for high signal integrity

Suitable for AC and DC switching applications

Designed for automated PCB assembly

Specifications

Model: HFD4-4.5-SR

Brand: Hongfa

Device Type: Subminiature Sealed SMD Relay

Contact Form: Form 2C (DPDT / 2c/o)

Termination: SMD

Coil Rated Voltage: 4.5VDC

Coil Resistance: 145

Maximum Switching Current: 2A

Electrical Rating:

2A at 30VDC

0.5A at 125VAC

250VAC Max

Contact Material: Gold Flash Contacts

AC/DC Voltage: DC

Applications

Compact PCB control systems

Industrial automation modules

Signal routing circuits

Embedded electronics

Low-voltage switching applications

The HFD4-4.5-SR offers a strong balance of compact SMD design, reliable sealed construction, and efficient low-voltage switching, making it ideal for modern high-density electronic applications.

What's in the box
1 x HFD4-4.5-SR Signal Subminiature Sealed Surface-Mount (SMD) Relay 4.5VDC DPDT