HIRESFI ISAR740 USB Isolator Hi-Speed 480MBit

100 % of 100
€42.60 €35.21
In stock
USBUp to USB 2.1 High-Speed 480Mbps bidirectional
USB Voltage Regulator and Isolator5V 2000mW w/o external power supply
USB Signal Isolationup to 2500 V (ADuM3165)
USB Voltage Isolationup to 3000 V (muRata NXE2)
Sampling Rates with DACup to 384kHz
InUSB-A plug
OutUSB-A socket
Function ControlPower LED on output voltage
Dimensions20mm x 10mm
Lengthapprox. 65mm
Weightapprox. 10g

Package Contains

  • HIRESFI ISAR740 USB Isolator USB-A Plug / USB-A Socket

ISAR740 - USB Isolator with ADuM3165/ADuM3166 and Ultra-Low-Noise DC-DC Converter muRata NXE2.

ISAR740 is an USB isolator for interconnection of sensitive USB devices, such as USB DACs or Weather Stations. It will isolate the power from the USB host and the connected device and provides a cleaner 5V DC USB voltage to the USB device. The isolator will create a new ground for the USB device so that it doesn't have to share ground with your computer and other devices you might have connected in the same premise. USB devices with their own power supply can still be connected.

The effective isolation of the USB device from the host most often ensures not only a measurable, but also a hearable improvement when using it together with an USB DAC. Without isolation, the digital signal processing in the computer otherwise impacts stability of ground signals quite dramatically.

As soon as an audio amplifier with its own ground and its own power supply is connected for analog audio amplification, current flows for potential compensation between computer and amplifier on common ground signals. This current will then most often be heard as noise, high frequency whistling, humming, howling or chirping. Some applications on the computer, which sometimes generate pretty intense noise are scolling in the internet browser or playing videos - and its related CPU- and GPU-intense signal processing.

When connecting a Weather Station with its own grounding or relatively long USB cable outdoors, sometimes connection between Weather Station and computer suffers.

A new ground - to be more precise, an isolation of computer-ground and device ground - adds clarity and cares for a strict separation of different ground signals. Therefore, ISAR740 is the prerequisite for a high quality sound experience and reliable data connection.

Unfortunately, all DC-DC converters, not only those for USB isolation, quite often generate a new little problem with their ripple and noise on the new USB ground by themselves. While most USB isolators are based on simple DC-DC converters, ISAR740 on the other hand utilizes a high-end converter muRata NXE2. This fact improves sound quality significantly.

NXE2 by muRata specifies its output ripple & noise with 55mVp-p. ISAR740 in addition utilizes a L-C circuit which lowers noise at normal load to 5mVp-p.

Analog Devices ADuM3165/ADuM3166 is a USB 2.0 port isolator, utilizing AD iCoupler® technology to dynamically support all USB 2.0 data rates: low (1.5 Mbps), full (12 Mbps), or high (480 Mbps), as required. The devices support host isolation with automatic speed negotiation as well as peripheral isolation. High speed data is retimed for jitter reduction. The ADuM3165/ADuM3166 supports the clock or crystal input on the upstream side to best suit the system design. The low power standby mode for downstream (Side 2) supports applications with limited available power, such as battery-operated peripherals. The upstream (Side 1) standby current meets USB 2.0 requirements for suspended operation.

Unlike ISAR520 or ISAR540, ISAR740 supports three USB protocols: USB HIGH SPEED with 480Mbps, USB FULL SPEED with 12 Mbps and USB LOW SPEED. The current protocol is automatically detected by the isolator. Thus, all common DAC sampling rates with 384kHz 192kHz 96kHz 48KHz and 44.1kHz are supported. ISAR740 is the all-rounder among the USB isolators.

Typical Applications

USB DAC with USB High Speed (480Mbps) and 384kHz or 192 KHz, USB Full Speed (12 Mbps) up to 96kHz 24bit; USB Sound Card; USB Sound Box; USB Oscilloscope; USB Logic Analyzer; ...

Supports USB adaptive mode and USB asynchronous mode.


  1. Und nichts brummt mehr
    Ich habe das Ding gekauft weil ich an meinem KHV ein Brummen hatte beim bewegen der Maus und
    auch so, wenn die Musik aus war und die Lautstärke aufgedreht.
    Vorab: mein PC besteht aus relativ teuren Komponenten. ein ASUS Z390 Gene Board + 850W COrsair
    Platinum HX850i Netzteil. Also man dürfte eigentlich nicht davon ausgehen, dass es an mangelnder
    Qualität der Bauteile liegt.
    Mein PC ist mit einem aune x1s verbunden, welcher widerum an einem Little Dot MkII hängt. Sowohl
    der x1s, also auch der Little Dot MkII und der PC stecken jeweils in einer eigenen Wand-Steckdose.
    Das USB-Teil hat das Brummen einfach komplett eliminiert. Der DAC meines aune x1s lässt sich auch
    trotz Angabe, dass maximal DACs mit 48khz betrieben werden können mit 32 Bit und 96khz betreiben.
    Absolut empfehlenswert.

    Review by

    Posted on

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