Terminal Blocks - Headers, Plugs and Sockets

Image	Part Number	Description / PDF	Quantity	Rfq
	A-TB500-TJ09 ASSMANN WSW Components	TERM BLOCK PLUG 9POS STR 5MM	0
	A-TB381-OQ02CH ASSMANN WSW Components	TERM BLOCK HDR 2POS 90DEG 3.81MM	0
	A-TB350-TT08 ASSMANN WSW Components	TERM BLOCK PLUG 8POS 90DEG 3.5MM	0
	A-TB350-VK21 ASSMANN WSW Components	TERM BLOCK HDR 21POS 45DEG 3.5MM	0
	A-TB381-OQ21CV ASSMANN WSW Components	TERM BLOCK HDR 21POS VERT 3.81MM	0
	A-TB381-OQ05CV ASSMANN WSW Components	TERM BLOCK HDR 5POS VERT 3.81MM	0
	A-TB381-VK11 ASSMANN WSW Components	TERM BLOCK HDR 11POS 3.81MM	0
	A-TB750-OQ14CH ASSMANN WSW Components	TERM BLOCK HDR 14POS 90DEG 7.5MM	0
	A-TB350-TH19 ASSMANN WSW Components	TERM BLOCK PLUG 19POS 3.5MM	0
	A-TB508-VK12 ASSMANN WSW Components	TERM BLOCK HDR 12POS 5.08MM	0
	A-TB500-OQ20CH ASSMANN WSW Components	TERM BLOCK HDR 20POS 90DEG 5MM	0
	A-TB350-OQ09CV ASSMANN WSW Components	TERM BLOCK HDR 9POS VERT 3.5MM	0
	A-TB381-OQ11CV ASSMANN WSW Components	TERM BLOCK HDR 11POS VERT 3.81MM	0
	A-TB500-OQ23CV ASSMANN WSW Components	TERM BLOCK HDR 23POS VERT 5MM	0
	A-TB508-OQ17CH ASSMANN WSW Components	TERM BLOCK HDR 17POS 5.08MM	0
	A-TB508-TJ22 ASSMANN WSW Components	TERM BLOCK PLUG 22POS STR 5.08MM	0
	A-TB350-VK18 ASSMANN WSW Components	TERM BLOCK HDR 18POS 45DEG 3.5MM	0
	A-TB500-VK11 ASSMANN WSW Components	TERM BLOCK HDR 11POS 45DEG 5MM	0
	A-TB350-TH22 ASSMANN WSW Components	TERM BLOCK PLUG 22POS 3.5MM	0
	A-TB508-VK15 ASSMANN WSW Components	TERM BLOCK HDR 15POS 5.08MM	0

Terminal Blocks - Headers, Plugs and Sockets

1. Overview

Terminal blocks, headers, plugs, and sockets are essential components in electrical and electronic systems for establishing reliable connections between circuits. These devices enable signal transmission, power distribution, and system modularity. Their standardized designs ensure interoperability, scalability, and ease of maintenance in complex systems.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Terminal Blocks	Screw/clamp-based connections for high current/ voltage	Industrial control panels, power distribution units
PCB Headers	Pin/grid arrays for board-to-board connections	Embedded systems, Arduino shields
RJ Connectors	Modular jacks for data/telecom signals	Ethernet networks (RJ45), telephone systems (RJ11)
D-Sub Connectors	Multi-pin trapezoidal shells for analog/digital signals	Legacy serial interfaces, industrial sensors
USB Connectors	Hot-pluggable interfaces for power/data	Consumer electronics, peripheral devices

3. Structure and Components

Typical structures include:

Insulating housing (PA66, PBT, or LCP plastics)
Contact elements (phosphor bronze, beryllium copper)
Plating materials (gold, tin, nickel for corrosion resistance)
Actuation mechanisms (screws, spring clamps, or friction fits)
EMI shielding layers (for high-frequency applications)

4. Key Technical Specifications

Parameter	Importance
Current Rating (A)	Determines power handling capacity
Voltage Rating (V)	Defines dielectric strength requirements
Contact Resistance (m )	Impacts signal integrity and power loss
Insertion Loss (dB)	Critical for high-speed data transmission
Mating Cycles	Indicates mechanical durability
Operating Temperature (- C to + C)	Defines environmental tolerance

5. Application Fields

Primary industries include:

Industrial automation (PLCs, HMIs)
Telecommunications (5G base stations, routers)
Consumer electronics (smartphones, wearables)
Medical equipment (imaging devices, patient monitors)
Automotive (EV charging systems, ADAS)

6. Leading Manufacturers and Products

Manufacturer	Representative Product
Phoenix Contact	COMBICON series terminal blocks
TE Connectivity	MICRO MATCH connectors
Molex	SL Series headers
Amphenol	D-Subminiature connectors
Samtec	QTE high-speed socket systems

7. Selection Guidelines

Key considerations:

Electrical requirements (current/voltage levels)
Mechanical constraints (space, vibration)
Environmental factors (temperature, humidity)
Signal integrity needs (frequency, noise rejection)
Cost vs. reliability trade-offs
Compliance with standards (IPC, IEC, UL)

8. Industry Trends

Emerging developments include:

Miniaturization for wearable devices
High-speed connectors for 5G/6G ( 25 Gbps)
Hybrid connectors integrating power/data
Eco-friendly materials (halogen-free, RoHS compliant)
Smart connectors with built-in sensors
Automotive-grade connectors for EVs