Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
282822-2 TE Connectivity AMP Connectors	TERM BLOCK HDR 2POS VERT 5MM	0
1546931-9 TE Connectivity AMP Connectors	TERM BLOCK HDR 9POS VERT 5MM	0
1-1986693-7 TE Connectivity AMP Connectors	TERM BLOCK PLUG 17POS STR 3.5MM	0
2350398-4 TE Connectivity AMP Connectors	4 POS SPRING TB PLUG PITCH 3.50	3803
1986717-3 TE Connectivity AMP Connectors	TERM BLOCK HDR 3POS VERT 3.5MM	694
796638-4 TE Connectivity AMP Connectors	TERM BLOCK HDR 4POS 90DEG 5.08MM	876
282832-7 TE Connectivity AMP Connectors	TERM BLOCK HDR 7POS VERT 5MM	0
2351885-3 TE Connectivity AMP Connectors	3POS TB HDR 180 DEG PITCH 5.0&TL	2288
2351885-4 TE Connectivity AMP Connectors	4POS TB HDR 180 DEG PITCH 5.0&TL	2959
1-2342077-5 TE Connectivity AMP Connectors	TERM BLCK HDR 15POS 90DEG 3.81MM	200
284513-4 TE Connectivity AMP Connectors	TERM BLOCK HDR 4POS 90DEG 3.81MM	1004
1546111-8 TE Connectivity AMP Connectors	TERM BLOCK HDR 8POS VERT 5.08MM	0
1986692-8 TE Connectivity AMP Connectors	TERM BLOCK PLUG 8POS STR 3.5MM	0
2-2342077-5 TE Connectivity AMP Connectors	TERM BLCK HDR 25POS 90DEG 3.81MM	99
1-2342082-7 TE Connectivity AMP Connectors	TERM BLOCK HDR 17POS VERT 5MM	200
284541-3 TE Connectivity AMP Connectors	TERM BLOCK HDR 3POS 90DEG 3.81MM	284
2342078-4 TE Connectivity AMP Connectors	4POS HDR ST HT 3.81MM PITCH TL 1	600
2350398-3 TE Connectivity AMP Connectors	3 POS SPRING TB PLUG PITCH 3.50	3953
2342084-6 TE Connectivity AMP Connectors	6POS HDR ST HT 5.08MM PITCH TL 2	400
1-2342071-6 TE Connectivity AMP Connectors	TERM BLOCK HDR 16POS VERT 3.5MM	200

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