8-MOSFET: A stackable, DIN-rail mountable, solid-state power driver for
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Eight MOSFETs Per Card & Up to Eight Cards per StackWhen looking to drive high loads with a microprocessor, hardware designers
typically turn to relays, in part because relatively inexpensive relays are
still quite reliable under most circumstances. While they tend to perform well
under AC loads, however, they fall short when faced with high DC voltages, fast
switching times, and endurance requirements. Which is where 8-MOSFET comes in.
Drive High DC LoadsPopular relay boards for the Arduino and Raspberry Pi platforms can drive loads
of up to 250 VAC but only 30 VDC. It is, of course, possible to find specialized
relays capable of driving 240 VDC loads, but they’re quite expensive—somewhere
in the $10 range—and they’re lacking in other areas. A $1 solid-state MOSFET
driver, on the other hand, can easily drive a 240 VDC load while also providing
other benefits, such as…
Fast Switching TimesRelays switch their loads by mechanically moving blades. As a result, their
switch time is rather high—typically tens of milliseconds. Furthermore, moving
parts tend to vibrate, which creates electrical noise when they make or break
contact. For applications that require fast, clean switching times, a MOSFET
will get the job done in under 0.1 mS with no electrical noise.
High Endurance Under Heavy LoadsLast but not least, while relays have acceptable endurance when switching low
currents, their lifespans shrink to somewhere in the neighborhood of 100,000
cycles at high currents. So, if a relay needs to switch a large load once per
minute, it might reach the end of its life within a couple of months. A MOSFET,
by contrast, has nearly unlimited longevity.
Industrial Reliability at a Reasonable PriceDesigned for the industrial automation market, where reliability is critical,
8-MOSFET can drive four high-current loads (24 VDC at 10 A) and four
high-voltage loads (240 VDC at 2 A). At the same time, its price tag brings it
within reach of anyone who appreciates performance and reliability.
It’s also quite easy to use. 8-MOSFET employs industrial-grade, pluggable
connectors that facilitate field installation and debugging. Status LEDs show
when MOSFETs are on or off.
And it’s scalable. Up to eight cards can be stacked on top of a single Raspberry
Pi, giving your Pi the ability to drive up to 64 loads. And, because 8-MOSFET
only occupies the I²C interface, you’ll still have 24 GPIO pins to use for other
applications.
Two DIN-rail Mounting Options8-MOSFET supports two different DIN-rail orientations.
Parallel to the RailFor a single card or a two-card stack, the parallel mounting kit is ideal.
While one kit can technically support any number of cards, it becomes
mechanically unstable once you get two or three 8-MOSFET cards piled up on your
Raspberry Pi.
Perpendicular to the RailBe
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