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【Popular Science 】Pitfalls in Component Selection: A Complete Guide to Classification Criteria & Application Scenario Selection for Board-to-Board, Wire-to-Board and Wire-to-Wire Connectors
- Categories:Industry News
- Author:Guangdong Deke Electric Co., Ltd.
- Origin:https://www.de-ke.cn/
- Time of issue:2026-08-04 15:34
- Views:
【Popular Science 】Pitfalls in Component Selection: A Complete Guide to Classification Criteria & Application Scenario Selection for Board-to-Board, Wire-to-Board and Wire-to-Wire Connectors
- Categories:Industry News
- Author:Guangdong Deke Electric Co., Ltd.
- Origin:https://www.de-ke.cn/
- Time of issue:2026-08-04 15:34
- Views:
At the schematic design and BOM component selection stages of hardware development, most engineers tend to confuse three basic interconnect connector types: board-to-board, wire-to-board and wire-to-wire connectors. Improper selection will trigger a series of implicit cost losses, including PCB redesign, rework of vehicle wiring harnesses, excess inventory of supply chain materials and extended R&D cycles. Combined with universal specifications in the electronic interconnection industry, this article systematically analyzes structural differences, applicable working conditions, key selection parameters and verification criteria for the three types of connectors.
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DEKEELEC—— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— ——
I. General Conclusions for Rapid Selection
The core distinction among the three types of connectors lies in mating media. Their structures, mounting methods and application scenarios are not interchangeable.
1. Board-to-Board (B2B): No external wires. Two PCBs are interconnected directly. It delivers the shortest signal transmission path, suitable for miniaturized equipment and high-density stacking applications.
2. Wire-to-Board (WTB): One end is soldered to PCB via SMT/DIP, and the other end is crimped to wire harnesses. It serves as the dominant internal wiring solution for industrial control and energy storage equipment.
3. Wire-to-Wire (WTW): Both ends are crimped with cables, independent of PCB boards. Mostly applied to detachable extension harnesses outside equipment and outdoor vibration-prone working conditions.
Mandatory prerequisites for selection include completing reliability tests such as temperature rise, temperature cycling and mating endurance based on rated current, pin pitch, temperature resistance range and vibration class.
Primary Application Fields
Industrial automation servo systems, new energy energy storage PACKs, medical imaging inspection equipment, server power supplies, and supporting hardware for AI computing cabinets.
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II. Comparison Table of Core Parameters for the Three Connector Types (Available for Enterprise Standardized Material Classification)
Specification Note: This classification follows the general criteria adopted by the global electronic interconnection industry. It can be applied to enterprise BOM lists, part numbering systems, and warehouse inventory management for standardized supply chain control.
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III. Key Selection Points for Each Connector Category
3.1 Board-to-Board (B2B) Connectors
With no intermediate wire transition, B2B connectors deliver the lowest signal link loss and offer prominent advantages in equipment space optimization, making them the preferred choice for slim, high-density modular hardware.
Main pitch variants: 0.4mm ultra-fine high-speed precision series, 1.0~1.27mm general signal series, 2.0/2.54mm high-current pin headers, and PCIe mezzanine power connectors.
Optimal application scenarios: Main control boards of AI computing servers, core stacked modules of industrial all-in-one machines, portable medical testing equipment, and precision wearable hardware.
Selection Tips: For high-speed and high-frequency signal transmission, emphasis shall be placed on terminal shielding structure, differential impedance matching and dielectric stability to avoid signal crosstalk and EMI issues.
3.2 Wire-to-Board (WTB) Connectors
As the most widely adopted interconnect type for industrial equipment, WTB connectors balance wiring flexibility and ease of maintenance. They cover full specifications ranging from 1–5-pin low-signal variants to multi-pin high-current power types, with mainstream high-current pitches including 3.96mm, 5.08mm and 7.92mm.
Application scenarios: PLCs, photovoltaic inverters, CT medical imaging equipment, industrial switching power supplies, and internal power connections for servo drives.
Selection Tips: Wire-to-board structures are preferred when the mainboard requires multiple external wiring and frequent disassembly for maintenance. This category features the highest maturity of domestic substitution, with outstanding advantages in cost reduction and delivery flexibility.
3.3 Wire-to-Wire (WTW) Connectors
Wire-to-wire connectors realize direct cable-to-cable interconnection independent of PCBs. Their structure allows easy integration of waterproof and anti-vibration locking components, making them ideal for harsh outdoor environments with drastic temperature fluctuations, continuous vibration, humidity and dust.
Application scenarios: Charging cables for new energy vehicle chargers, wiring for two-wheeler battery packs, field extension cables for energy storage power stations, and outdoor industrial sensor harnesses.
Selection Tips: Wire-to-wire connectors are recommended for segmented external equipment wiring, quick field mating and disassembly, and open-air humid environments. For waterproof versions, verify the compression rate of sealing rings and weather resistance grade of plastic housings to ensure protective performance does not degrade after temperature-humidity cycling.
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IV. Five-Step Implementation Process for Standardized Selection
1. Architecture Sorting: Break down all interconnection points of the complete equipment, distinguish PCB interconnection, board-to-wire interconnection and cable-to-cable interconnection areas one by one, and define the application scope of the three connector types.
2. Parameter Confirmation: Clarify five core operating parameters: rated current, pin pitch, operating temperature range, vibration class and IP protection rating.
3. Sample Benchmarking: Obtain reference samples and carry out comparative reliability tests.
4. Reliability Verification: Conduct a full set of tests including temperature rise test, random vibration test, temperature-humidity cycling test, mating endurance test and contact resistance stability test.
5. Small-Batch Trial Production: Perform assembly verification in small batches to check compatibility. Mass production can be launched only after confirming no risks such as overheating, loosening and poor contact, so as to guarantee consistent quality.
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V. Frequently Asked Questions on Selection
Q1: What is the simple method to quickly distinguish the three types of connectors?
A: Check the mating objects at both ends of the connector. Board-to-Board: Both ends soldered to PCBs; Wire-to-Board: One end soldered to PCB, the other end crimped to wires; Wire-to-Wire: Both ends crimped with cables.
Q2: Which connector type should be adopted for internal power supply and probe cables of medical equipment respectively?
A: Wire-to-board connectors are used for connections between the main control board and internal power harnesses of equipment. Board-to-board connectors apply to multi-layer module stacking on main boards. Waterproof wire-to-wire connectors are selected for extension cables of external detection probes.
Q3: Is PCB redesign required for the introduction of domestic alternatives?
A: Board-to-board and wire-to-board models with identical pin pitch and pad footprint can be seamlessly compatible with the original PCB without redesign. Wire-to-wire connectors have no PCB-dependent structure; only the matching wire gauge needs to be verified.
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