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Analog Devices MAX5943AEEE+ — Analog & Data Acquisition
Analog Devices

MAX5943AEEE+ N+1 ORing Controller, 7.5V–37V, 100ns turn-off

MPNMAX5943AEEE+
End of Life

Maxim MAX5943AEEE+, N+1 ORing Controller, N-Channel FET drive, 7.5V–37V supply, 1.3 mA supply current, 100 ns turn-off delay, -40°C to 85°C, 16-QSOP package.

$5.54Ref. price · indicative, final on quote
MAX5943AEEE+ datasheet
Packaging16-SSOP (0.154", 3.90mm Width)
StockContact for availability
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Specifications

MAX5943AEEE+ Technical Specifications
ParameterValue
TypeN+1 ORing Controller
FET typeN-Channel
Mounting typeSurface Mount
Voltage7.5V ~ 37V
Current - supply1.3 mA
Operating temperature-40°C ~ 85°C
PackageTube
ApplicationsFireWire®
Case16-SSOP (0.154\", 3.90mm Width)
Delay time - OFF100 ns
Internal switchNo
Ratio - Input:OutputN:1

Product details

What the MAX5943AEEE+ is and where it fits

The MAX5943AEEE+ is an N+1 ORing controller that drives an external N-channel MOSFET in redundant power-supply ORing configurations. It targets FireWire applications. The 100 ns turn-off delay is the headline speed figure: when the input voltage drops below the output, the controller shuts the external FET in 100 ns, preventing reverse current that could collapse the output rail. That speed matters for hot-swap and redundant-supply designs where millisecond delays cause bus droop.

Package and footprint

Housed in a 16-pin QSOP (3.90 mm body width, 0.154" pitch), the surface-mount package fits dense PCB layouts. The supplier device package is 16-QSOP, a common footprint for ORing controllers in this class.

Lifecycle and sourcing

The MAX5943AEEE+ is listed as Active in production with ROHS3 compliance.

Frequently asked questions

What is the MAX5943AEEE+ used for?

It is an N+1 ORing controller for redundant power-supply ORing, primarily in FireWire (IEEE 1394) applications. It drives an external N-channel MOSFET to replace a Schottky diode, reducing forward drop and power dissipation.

Is MAX5943AEEE+ compatible with 12V systems?

Yes — the supply range is 7.5V to 37V, so it covers 12V and 24V rails without issue.

What is the difference between MAX5943AEEE+ and MAX5943BEEE+?

The difference lies in the turn-off threshold and timing; the 'A' variant is the standard-speed version with 100 ns turn-off, while the 'B' variant targets a different threshold. Both are pin-compatible in the same 16-QSOP footprint.