Hot-Swap Receptacles for Mechanical Keyboards

Mill-Max 3305 series open-bottom solder-mount receptacles for hot-swap keyboard switches.

Mill-Max receptacles enable efficient replacement or upgrade of keyboard switches and other PCB components

Mill-Max 3305-X Hot-Swap Receptacles

Mill-Max has recently developed a new series of open bottom, low profile, solder mount receptacles specifically designed to make your mechanical key switches hot-swappable. The new 3305-X is designed to be soldered into a .062” (1,575mm) minimum mounting hole, with an ultra-thin retention shoulder so plugged-in components sit nearly flush to the board surface. The open bottom design is meant to accommodate varying lead lengths making this a very versatile receptacle.

The 3305-X series offers three length options of .105” (2,67mm), .130” (3,30mm), and .155” (3,94mm), all with an above-board height of .010” (0,25mm), providing the low profile desired for optimal switch height and functioning. And while these receptacles are compact in size, high-quality materials make these easy-to-use parts both reliable and long-lasting. Like all Mill-Max receptacles, the 3305-X series utilizes a beryllium copper contact clip to make dependable, low resistance connections with mated leads and maintain those high-quality connections after thousands of cycles (plug/unplug). The 3305-X accepts round leads of .025”-.037” (0,635-0,940mm) in diameter as well as square and rectangular leads (.019” - .026” square) – typical of the leads found on most keyboard switches.

Why Use Receptacles for Hot-Swappable Keyboards?

The introduction of the 3305-X series and this style of receptacle means that repairing, upgrading, or customizing keyboards – once tedious and time-consuming endeavors – have become viable options by eliminating the painstaking task of de-soldering then re-soldering an entire keyboard - a process which could take 90 minutes or more each time, depending on the user’s skill level. Conversely, after the one-time process of installing Mill-Max 3305-X receptacles, all the key switches can be replaced in just a few minutes, many times over, allowing users of all skill levels to join the hot-swap keyboard movement.

Open bottom design. Accommodates varying lead lengths, making this a very versatile receptacle.
Low profile. Three lengths, all with an above-board height of .010” (0,25mm) for optimal switch height and functioning.
Beryllium copper contact clip. Dependable, low resistance connections with mated leads, cycle after cycle.
Fits keyboard switch leads. Accepts round leads of .025”-.037” (0,635-0,940mm) as well as square and rectangular leads typical of most keyboard switches.

Specifications

Specification	3305 Series
Accepted leads	Round: .025”-.037” (0,635-0,940mm) diameter
Overall length / hole depth	3305-0: .105” (2,667mm); 3305-1: .130” (3,302mm); 3305-2: .155” (3,937mm)
Hole type	Open bottom
Body diameter	.058” (1,473mm)
Flange diameter	.077” (1,956mm)
Mounting	Solder mount, plated through hole. Mounting hole .062” (1,575mm)
Shell	Brass alloy. 10µ” gold over nickel (-15-) or 200-300µ” matte tin over nickel (-80-)
Contact	Beryllium copper, 6 fingers, 30µ” gold over nickel
Current rating	15A at 30°C temperature rise; 12A derated (20%)
Contact resistance	10mΩ max
Durability	1,000 cycles minimum
Operating temperature	-55°C to +125°C
Shock / vibration	No electrical discontinuity >1µs at 50g / 10-2000Hz, 20g
Packaging	Bulk (-15-) or vertically on tape & reel, 13” reel (-57-)
RoHS	Compliant

Available Part Numbers

Part Number	Description	Resources
● 3305-0-15-15-47-27-10-0	.105” long, gold shell, bulk	DatasheetOrder SampleCheck Stock
● 3305-0-15-80-47-27-10-0	.105” long, tin shell, bulk	DatasheetOrder SampleCheck Stock
● 3305-1-15-15-47-27-10-0	.130” long, gold shell, bulk	DatasheetOrder SampleCheck Stock
● 3305-1-15-80-47-27-10-0	.130” long, tin shell, bulk	DatasheetOrder SampleCheck Stock
● 3305-2-15-15-47-27-10-0	.155” long, gold shell, bulk	DatasheetOrder SampleCheck Stock
● 3305-2-15-80-47-27-10-0	.155” long, tin shell, bulk	DatasheetOrder SampleCheck Stock

^●^{Normally stocked at our Authorized Distributors.}

^{All parts are also available vertically on tape & reel: change the -15- packaging code to -57- (for example, 3305-0-15-15-47-27-10-0 becomes 3305-0-57-15-47-27-10-0).}

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Published Date

April 12th, 2021

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