This post explains for the relay.

The Part Number is A5W-K, A-5W-K.

The function of this semiconductor is DC 5V, Solid State relay.

Manufacturer: Fujitsu Microelectronics

Preview images :

Description

A5W-K is 5V DC, Solid State Relay. A Solid State Relay (SSR) is an electronic switching device that is used to control electrical loads without the need for mechanical contacts like those found in traditional electromagnetic relays. Instead of using moving parts and physical contacts, SSRs utilize solid-state components like semiconductor devices (usually power transistors) to perform the switching action.

Features

1. Extremely low profile and light weight
(1) Height: 5 mm
(2)Weight: approximately 1.2 g

2. Meet FCC (Part 68) standard

3. Conforms to FCC rules and regulations part 68
(1) Surge strength 1,500 V

4. High reliability—bifurcated contacts

5. Wide operating range

6. DIL pitch terminals

7. Plastic sealed type

8. Latching version available

[…]

SSRs find applications in various industries and systems, including industrial automation, HVAC systems, robotics, medical equipment, lighting control, heating systems, and more.

A5W-K PDF Datasheet

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This post describes for the miniature relay.

The function of this semiconductor is 5V, relay.

The contact is 2 form C Type.

The package is DIP 8 Pin type

The manufacturer of this parts is Fujitsu Microelectronics.

See the preview image and the Datasheet PDF file for more information.

Description

46ND005-P is DC 5V, Relay. A relay allows a low-power electrical signal, such as from a microcontroller or sensor, to control a much larger current or voltage, such as required to drive a motor or light bulb. This allows a small electronic device to control a much larger one, or to isolate the low-power circuit from the high-power one. Relays are used in a wide range of applications, including automotive systems, HVAC systems, and computer power supplies.

Features

1. Miniature size :

About 50% smaller in volume compared with the FBR240 series used mainly in communication equipment.

2. High surge voltage :

2,500 V minimum of surge strength (Bellcore standard), and 1,500 VAC minimum of dielectric strength between coil and contact (-15, -16 type).

3. Low power consumption :

85 mW of operate power (150 mW of nominal power consumption) by built-in permanent magnet.

4. Shipping tube package

5. RoHS compliant since date code: 0433A

Please see page 7 for more information […]

Applications:

1. For signal switching

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46ND005-P PDF Datasheet