0.4mm Pitch, 34-Pin, Micro-Coaxial Cable Connector
Purpose-built for medical imaging and precision electronics, the USLS21 series brings KEL’s proven micro-coaxial connector platform to a solder-terminated, 34-pin format engineered around the signal counts medical devices demand.
Overview
Micro-coaxial cable is prized for being thin and compact while retaining a coaxial structure for high signal integrity and flexibility. KEL’s micro-coax connectors carry those signals without sacrificing that advantage, and have an established track record in imaging equipment and a broad range of markets, earning strong evaluations for product size, noise performance, and reliability.
The USLS21 series extends that heritage. It keeps the compact footprint, EMI countermeasures, and reliability of the existing line, while adding the signal count and cable-assembly solder termination that medical equipment requires.
Why 34 Pins?
When KEL surveyed medical equipment to develop the USLS series, a pattern emerged: required signal counts are typically multiples of 16. For a 32-signal application, a 30-pin connector falls short and a 40-pin connector is oversized.
The answer was a 34-pin part with 32 signals plus 2 spare. It is, in the truest sense, a connector made for medical devices.
The solder-type development also widened cable compatibility, adding support for AWG#42 and AWG#44. Existing press-fit (IDC) versions are available in 20, 30, and 40-pin.
EMI Countermeasures
Preserving the transmission characteristics of coaxial cable at the connector interface is critical. USLS21 does this through three design choices:
• Gold plating for stable, low-resistance contact
• Multi-point ground contact — 8 grounding points on the board side
• A shortened, single-path ground route via the mated cross-section, reducing the ground path distance
Together these improve both transmission and EMI performance, keeping signal quality intact from cable to board.
Spezifikationen
General
Product type: Micro-coaxial cable connector / stacking connection
Cable connection: Solder type
Pitch: 0.4 mm
Number of pins: 34 (32 signal + 2 spare)
Compatible cable: Micro-coax AWG#40, 42, 44, 46; cable OD φ0.39 mm or less
Mated height / width: 1.65 mm / 3.05 mm
Effective mating length: 0.35 mm
Electrical & Environmental Ratings
Rated current: 0.25 A per terminal
Contact resistance: 100 mΩ max (excluding cable resistance)
Withstand voltage: AC 200 V for 1 minute
Insulation resistance: DC 250 V, 100 MΩ min
Insertion / extraction durability: 30 cycles
Operating temperature: -40 °C to +85 °C
Materials & Finishes
Insulator: LCP (glass-fiber filled), UL94V-0, black
Contact: Copper alloy — nickel underplate, gold finish
Shell (board side): Copper alloy — nickel underplate, gold finish
Metal shell (cable side): Stainless steel — nickel underplate, gold finish
At a Glance
The USLS21 is a compact, reliable, EMI-conscious micro-coax connector, re-engineered in solder-type, 34-pin form for the exact signal counts medical imaging and precision equipment call for. All without giving up the size and performance the USLS platform is known for.