Weidmüller SL-SMT 3.50/04/90RF 1.5SN BK BX Male Header Guide

The Weidmüller SL-SMT 3.50/04/90RF 1.5SN BK BX is a high-temperature-resistant male header designed for board connection in compact electronic assemblies. As part of the OMNIMATE Signal BL/SL 3.50 family, it is engineered for THT/THR solder connection and optimized for modern SMT-related production processes. That combination makes it a strong fit for manufacturers seeking dependable board headers that support repeatable assembly quality.

What This Weidmüller Header Is Designed For

This product is a 4-pole male header with a 3.50 mm pitch and a 90° plugging direction. It is intended to work with compatible female plug connectors in the same ecosystem. The clip-on flange version helps support a stable mechanical interface, while the 1.5 mm solder pin length is specifically optimized for reflow soldering methods.

Technical Specifications

The official product data lists IEC values of 320 V and 15 A, along with UL values of 300 V and 10 A. The header has a width of 20.86 mm, depth of 11.1 mm, and height of 9 mm. It uses tinned contacts, a black housing, and THT/THR solder termination. These values make it a practical board-level header for industrial and electronic use where compactness and thermal process compatibility are important.

Manufacturing Advantages

One of the key advantages of the Weidmüller SL-SMT 3.50/04/90RF 1.5SN BK BX is that it is optimized for SMT process requirements while still using a robust THT/THR solder interface. The 1.5 mm pin length is specifically intended for reflow-oriented production. That allows manufacturers to integrate it into efficient assembly workflows without losing the mechanical benefits of through-hole-related solder design.

Why a 4-Pole Male Header Matters

A 4-pole header is a highly useful format for compact signal and low-power applications. It is large enough to support grouped connections while remaining space-efficient for board design. In industrial electronics, this makes it relevant for controller boards, interface cards, communication modules, and compact automation devices.

Weidmüller SL-SMT 3.50/04/90RF Typical Applications

Common use cases include compact control electronics, industrial interface boards, communication devices, automation modules, and any design that requires a reliable male PCB header in a 3.50 mm pitch format.

For more information about Weidmüller, reviewing compatible female connectors in the BL/SL 3.50 family can help finalize the mating concept.

Weidmüller SL-SMT 3.50/04/90RF FAQ

What type of product is this?

It is a 4-pole male PCB header with a 3.50 mm pitch and 90° plugging direction.

What soldering method is it designed for?

It uses THT/THR solder connection and is optimized for reflow-related production processes.

What are its rated electrical values?

It is listed at 320 V / 15 A under IEC data and 300 V / 10 A under UL data.

Why is the 1.5 mm pin length important?

The 1.5 mm pin length is optimized for reflow soldering methods and supports efficient manufacturing workflows.

Where is this header commonly used?

It is commonly used in compact industrial electronics, interface boards, and modular control systems.