Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX PCB Header
The Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX is a 20-pole pluggable PCB male header developed for applications that need structured signal routing, dependable board connection, and compact industrial connector geometry. In practice, this kind of component is chosen by design engineers who want repeatable electrical contact, manageable installation, and an efficient way to connect multiple circuits on one board without sacrificing service accessibility.
Understanding the connector format
The product belongs to the OMNIMATE Signal family and uses a 3.50 mm pitch. That pitch remains highly relevant in industrial electronics because it gives a balanced compromise between compact footprint and workable pole spacing. With 20 poles available in one connector body, the Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX product is well positioned for control electronics, interface boards, signal conditioning assemblies, and compact I/O platforms.
The 135° outgoing direction is especially useful where wire routing must follow the physical architecture of the housing or board stack. This can help reduce awkward bends, improve cable organization, and create a more professional service layout inside the final device.
Technical profile of the Weidmüller 1003700000
This version is a male header with flange and THT/THR solder connection. It uses 3.2 mm tinned solder pins, a black housing, and box packaging. In terms of headline electrical data, the connector is listed at IEC 320 V / 15 A and UL 300 V / 10 A. Those values are important reference points for engineers working with industrial control boards and pluggable PCB connectors, although final performance in equipment always depends on real application conditions such as temperature rise, spacing, conductor selection, and relevant certification rules.
The 20-pole arrangement can be particularly valuable in electronics that require grouped terminals for sensors, field signals, actuator control, communication interfaces, or segmented low-voltage power distribution. Instead of breaking the design into several smaller headers, a 20-pole version often makes documentation, assembly, and service interpretation much more straightforward.
Why this 20-pole version matters
Not every board needs a 20-pole connector, but many do. That number often appears in practical layouts where multiple channels, commons, references, and control lines must be presented together. The Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX PCB header serves that requirement without moving into a larger pitch family that would consume more board area.
Another advantage is consistency. When a product family shares mechanical and electrical design logic across multiple pole counts, engineers can scale layouts more efficiently. If a project needs a close variant later, the family-based approach helps preserve assembly methods, mating logic, and design familiarity. This is one reason OMNIMATE signal connectors remain widely discussed in industrial PCB connector selection.
Mechanical and material considerations
The flange design gives the header a more deliberate mounted presence, which can be useful for alignment and structural confidence. The family platform uses an industrial-grade insulating material with flame-retardant behavior and copper-alloy contacts with tin-plated surfaces. That combination supports stable processing, dependable mating behavior, and practical long-term use in equipment that may experience maintenance cycles over time.
Because this is a THT/THR style header, it also appeals to designers who prefer the mechanical security that through-hole style terminations can provide. In industrial environments, that preference is often connected to handling stress, vibration expectations, or general robustness targets rather than only electrical performance.
Common use cases
The Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX connector can be relevant in building automation boards, HVAC controls, industrial monitoring devices, machine interface modules, access systems, compact controllers, and instrumentation assemblies. Anywhere that several lines must be connected in a compact, organized, pluggable format, this type of header becomes a logical engineering candidate.
Weidmüller 1003700000 For more information about Weidmüller, reviewing compatible pluggable connector series can help create a more standardized design platform across multiple PCB products.
Weidmüller 1003700000 FAQ
What is the main advantage of the Weidmüller 1003700000 SL-SMT 3.50/20/135F 3.2SN BK BX connector?
Its main advantage is the combination of compact 3.50 mm pitch and a relatively high 20-pole count, which supports dense but still practical board-level wiring in industrial and control applications.
Is this a screw terminal or a male header?
It is a male PCB header. It is designed to work within a pluggable connector system rather than acting as a standalone screw-clamp terminal block.
Why would an engineer choose a 20-pole header instead of two smaller connectors?
Using one 20-pole header can simplify layout, labeling, service access, and wiring logic. It may also reduce board clutter and help keep related circuits grouped together in a more understandable way.
What kind of solder connection does it use?
This version uses a THT/THR solder connection with 3.2 mm solder pins, making it suitable for board mounting strategies that emphasize retention and reliable assembly.
Where is this part commonly used?
It is commonly relevant in industrial electronics, building control, compact automation, interface boards, and other PCB-based systems where multi-line pluggable connectivity is part of the design strategy.