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Catalogue Flex Circuits Design Guide

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Value Added Design Options

Terminations

There are a variety of terminations for a flex circuit, and a variety of methods for applying these terminations.

Connectors

Connectors are usually customer selected, but Minco can recommend certain types of connectors to meet specific application requirements. Connectors can be attached to flex circuits by hand soldering, wave soldering, crimping, or simple insertion with zero insertion force (ZIF) models. Connectors can be potted after attachment or conformally coated for protection and insulation with epoxy, polyurethane, or RTV.

One good option for many low cost applications is the Clincher™ insulation displacement connector.

High density connectors, with 0.050" (1.27mm) or 0.025" (0.63mm) center-to-center terminals, are available from Omnetics Connector Corporation in several forms, including high temperature and MIL-spec options.


	Finger type	Centerline distance
	Supported	0.006" (0.15mm) min.
	Unsupported	0.020" (0.51mm) min.

Pins

• Socket pins are pressed in place and then soldered. Pins can be swaged to the circuit and soldered after the swaging procedure, or pins can be swaged to an FR-4 stiffener and then soldered. Swaged/soldered pins are moderately priced and have good mechanical strength.

• End pins that are in line with conductors can be brazed, soldered, or crimped to conductors. Pins can be bent to form a staggered arrangement.

• Flex circuits can interface to hardboards via soldered lap joints, lap joints applied with an anisotropic adhesive (conductive in the Z-axis only).

Pins can be inserted separately or ganged in a header. Minco recommends using an FR-4 or polyimide stiffener in pin areas to improve mechanical strength and simplify assembly.


	Pin type	Centerline distance
	Swaged	0.100" (2.54mm) typical, 0.085" (2.15mm) min.
	Brazed	0.100" (2.54mm) typical, 0.035" (0.89mm) min.

Vertical or horizontal mounting to fit your designs.

Up to 44 Beryllium Copper pins in less than half the space of an 0.050"(1.27mm) connector!

Crimped sockets and pins

Mil-spec connectors with temperature ratings to 200°C.

Round form connectors for surface mount installation.


	Connector type	Centerline distance
	Clincher connector	0.100" (2.54mm) min.
	Micro series pin center-to-center	0.050" (1.27mm) min.
	Nano series pin center-to-center	0.025" (0.63mm) min.

Swaged or nailhead pins with stiffener

Fingers

Fingers can be supported or unsupported. Supported fingers are ideal for ZIF connectors mounted on rigid boards. Unsupported fingers can be hot bar soldered to hard circuit boards.

Supported fingers

Unsupported fingers