Terminal Blocks - Headers, Plugs and Sockets

Image	Part Number	Description / PDF	Quantity	Rfq
	A-TB500-TJ02 ASSMANN WSW Components	TERM BLOCK PLUG 2POS STR 5MM	0
	A-TB350-OQ11CH ASSMANN WSW Components	TERM BLOCK HDR 11POS 90DEG 3.5MM	0
	A-TB762-OQ12CH ASSMANN WSW Components	TERM BLOCK HDR 12POS 7.62MM	0
	A-TB500-VG15SB ASSMANN WSW Components	TERM BLOCK PLUG 15POS 90DEG 5MM	0
	A-TB381-OQ20CV ASSMANN WSW Components	TERM BLOCK HDR 20POS VERT 3.81MM	0
	A-TB381-OQ18CV ASSMANN WSW Components	TERM BLOCK HDR 18POS VERT 3.81MM	0
	A-TB350-TT02 ASSMANN WSW Components	TERM BLOCK PLUG 2POS 90DEG 3.5MM	0
	A-TB750-TJ16 ASSMANN WSW Components	TERM BLOCK PLUG 16POS STR 7.5MM	0
	A-TB350-TH11 ASSMANN WSW Components	TERM BLOCK PLUG 11POS 3.5MM	0
	A-TB750-OQ03CH ASSMANN WSW Components	TERM BLOCK HDR 3POS 90DEG 7.5MM	0
	A-TB350-TT16 ASSMANN WSW Components	TERM BLOCK PLUG 16POS 3.5MM	0
	A-TB500-OQ04CV ASSMANN WSW Components	TERM BLOCK HDR 4POS VERT 5MM	0
	A-TB500-TJ07 ASSMANN WSW Components	TERM BLOCK PLUG 7POS STR 5MM	0
	A-TB500-OQ09CH ASSMANN WSW Components	TERM BLOCK HDR 9POS 90DEG 5MM	0
	A-TB500-VK18 ASSMANN WSW Components	TERM BLOCK HDR 18POS 45DEG 5MM	0
	A-TB350-TH23 ASSMANN WSW Components	TERM BLOCK PLUG 23POS 3.5MM	0
	A-TB508-OQ16CV ASSMANN WSW Components	TERM BLOCK HDR 16POS VERT 5.08MM	0
	A-TB762-OQ05CH ASSMANN WSW Components	TERM BLOCK HDR 5POS 90DEG 7.62MM	0
	A-TB508-VK16 ASSMANN WSW Components	TERM BLOCK HDR 16POS 5.08MM	0
	A-TB500-VK07 ASSMANN WSW Components	TERM BLOCK HDR 7POS 45DEG 5MM	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