Terminal Blocks - Wire to Board

Part Number	Description / PDF	Quantity
691243110008 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, HORIZONT	373
691244700006 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	199
691216610001 Würth Elektronik Midcom	TERM BLOCK 1POS SIDE ENTRY PCB	0
691210910002 Würth Elektronik Midcom	TERM BLOCK 2P HORIZON 2.54MM PCB	598
691502710002 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	1326
691508110308 Würth Elektronik Midcom	TERM BLOCK 8POS 3.5MM SMD	50
691412220005 Würth Elektronik Midcom	TERM BLOCK 5POS 45DEG 7MM PCB	0
691243200008 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, VERTICAL	99
691253500002 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, VERTICAL	499
691241610003 Würth Elektronik Midcom	TERM BLK 3P SIDE ENT 10.16MM PCB	0
691132700008 Würth Elektronik Midcom	TERM BLK 8POS TOP ENTRY 5MM PCB	0
691243100007 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, VERTICAL	499
691241800010 Würth Elektronik Midcom	TERM BLK 10P TOP ENTRY 10MM PCB	0
691212200101 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, VERTICAL	996
691132700003 Würth Elektronik Midcom	TERM BLK 3POS TOP ENTRY 5MM PCB	0
691104700002 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	588
691243200003 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, VERTICAL	2000
691413720011B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, 45 ENTR	167
691412420009 Würth Elektronik Midcom	TERM BLOCK 9POS 45DEG 7.62MM PCB	0
691411910012 Würth Elektronik Midcom	7.50 MM TERMINAL BLOCK, HORIZONT	24

Terminal Blocks - Wire to Board

1. Overview

Terminal blocks - wire to board are modular, insulated connectors used to securely join wires to printed circuit boards (PCBs). They provide reliable electrical connections while enabling easy maintenance and reconfiguration. These components play a critical role in bridging wired systems with electronic control units, ensuring signal integrity and power transmission in applications ranging from industrial automation to consumer electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Screw Terminal Blocks	Use screws for mechanical clamping force, offering high reliability and vibration resistance	Industrial control panels, HVAC systems
Spring Clamp Terminal Blocks	Utilize spring pressure for quick wire insertion/removal without tools	Smart home devices, test equipment
IDC (Insulation Displacement Connectors)	Cut through wire insulation for rapid termination, eliminating pre-stripping	Telecom equipment, automotive wiring harnesses
Push-in Terminal Blocks	Accept pre-stripped wires with minimal insertion force	Lighting control systems, factory automation
PCB Terminal Blocks	Through-hole or surface-mount designs optimized for board-level integration	Medical devices, embedded systems

3. Structure and Components

A typical wire-to-board terminal block consists of: - Insulating Housing: Made from high-temperature resistant thermoplastics (e.g., PA66, PBT) for dielectric isolation - Conductive Terminals: Brass or phosphor bronze contacts with plating (Sn, Ag, Au) for corrosion resistance - Clamping Mechanism: Screw, spring, or lever-actuated systems for wire fixation - PCB Interface: Male/female contacts or solder tails for board mounting - Retention Features: Polarization keys and mechanical stops to prevent misalignment

4. Key Technical Specifications

Parameter	Importance	Typical Values
Rated Current	Determines maximum continuous operating current capacity	1-30A
Rated Voltage	Defines safe operating voltage range	50-600V
Contact Resistance	Impacts power loss and thermal performance	10m
Insulation Resistance	Ensures electrical safety and signal integrity	100M
Operating Temperature	Determines material stability in working environment	-40 C to +120 C
Wire Gauge Range	Specifies compatible conductor sizes	26-4AWG
Material Glow-Wire Rating	Measures fire resistance per IEC 60335	650-960 C

5. Application Fields

Key industries include: - Industrial Automation: PLCs, motor drives, CNC machines - Consumer Electronics: Home appliances, audio equipment - Renewable Energy: Solar inverters, wind turbine controllers - Medical Equipment: Diagnostic devices, patient monitors - Automotive: EV charging systems, battery management units

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	PTSA 1.5/2-H-PE	Spring clamp, 1.5mm wire capacity, push-in PCB interface
TE Connectivity	CXT PCB Terminal Block	Surface-mount design, 3A rating, halogen-free
Weidm ller	SAM 2.5/ 4-GN	Plug-in connectors, vibration-proof, 2.5mm pitch
Molex	PicoBlade 0.8mm	Ultra-compact IDC terminals for fine wires

7. Selection Recommendations

Key considerations: 1. Electrical Requirements: Match current/voltage ratings with system specifications 2. Mechanical Needs: Choose clamping method based on maintenance frequency 3. Environmental Factors: Select materials for temperature/humidity extremes 4. PCB Compatibility: Verify pitch, height, and footprint specifications 5. Total Cost: Balance upfront cost vs. long-term reliability in mission-critical applications

8. Industry Trends

Emerging trends include: - Miniaturization for IoT and wearable devices - High-density connectors supporting 0.4mm pitch - Smart terminal blocks with integrated diagnostics - Increased adoption of press-fit technology - RoHS-compliant materials with improved tracking resistance - Connectors for high-voltage EV systems (800V+)