ADUM3160 USB Isolator

3 months ago

Profile:2.5kV USB 2.0 Isolator with 200mA Power Supply and Full Speed (12Mbps) Support

Open source license: CC-BY-SA 3.0

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Defective USB devices can destroy the USB port or even the motherboard of your PC. Special devices, such as a USB killer, actually serve this purpose. Furthermore, measuring devices with a USB connection can deliver incorrect measurement results due to ground loops, or even cause short circuits. This 2.5kV USB 2.0 Isolator with 200mA power supply and full speed (12Mbps) support is a simple solution to these problems.



ADuM3160 USB Isolator IC

The ADuM3160 is a 2.5kV USB port digital isolator. Combining high speed CMOS and monolithic air core transformer technology, this isolation component provides outstanding performance characteristics and is easily integrated with low and full speed USB-compatible peripheral devices.

Many microcontrollers implement USB so that it presents only the D+ and D− lines to external pins. This is desirable in many cases because it minimizes external components and simplifies the design; however, this presents particular challenges when isolation is required. Because the USB lines must switch between actively driving D+/D− and allowing external resistors to set the state of the bus, the ADuM3160 provides mechanisms for detecting the direction of data flow and control over the state of the output buffers. Data direction is determined on a packet-by-packet basis.

The isolator has a propagation delay comparable to that of a standard hub and cable. It operates with the bus voltage on either side ranging from 4.5 V to 5.5 V, allowing connection directly to V_BUSx by internally regulating the voltage to the signaling level. The ADuM3160 provides isolated control of the pull-up resistor to allow the peripheral to control connection timing. The device draws low enough idle current that a suspend state is not required. The 5kV reinforced insulation version, the ADuM4160, can also be used with this board.


  • Compatible with USB 2.0 full speed (12Mbps)
  • Bidirectional communication
  • VBUS operating voltage: 4.5V to 5.5V
  • 8mA maximum upstream supply current at 12Mbps
  • 2.3mA maximum upstream idle current
  • Upstream short circuit protection
  • Class 3A contact ESD performance
  • High common mode transient immunity: >25kV/μs

For transient voltage protection, TVS diode arrays are added at the input and the output in addition to the typical serial resistors. Note that the ADuM3160 is hardwired for USB2.0 full speed (12Mbps) support only on this board. Low speed devices may not work.


HLK-1D0505A Isolation DC/DC Converter

The HLK-1D0505A is a 5V input, 5V output 1W isolation DC/DC converter with small size and high efficiency. It is used to isolate the input from the output power of the device. It features:

  • Constant voltage input, isolated unregulated single output, 1W
  • Low super power consumption, standby power consumption is only 0.025W (input current 5mA)
  • Input and output isolation withstand voltage 1500VDC
  • Low ripple/noise <50mVpp
  • Conversion efficiency up to 88% (Typ)
  • Good output short circuit and over current protection with self-recovery
  • High reliability, long life design, continuous work >100000 hours
  • Potted with high-quality environmentally friendly waterproof and thermal conductive glue, moisture-proof and vibration-proof, and meets the IP65 standard

The output voltage is not regulated. The load at the output of the converter must be at least 10% of the specified maximum load, in this case 20mA, as otherwise the output voltage could rise significantly above 5.5V, which would damage the ADuM3160 or the connected device. A 5.1V Zener diode in connection with a small resistor provides this load if the voltage is too high. Without a connected downstream device, the maximum output voltage is limited to about 5.3V this way.



Parameter Value
USB Type USB 2.0 full speed 12Mbps
Input Voltage 4.5 - 5.5V
Output Voltage 4.7 - 5.3V
Output Voltage Ripple 30mVpp@100mA
Output Current max 200mA
Standby Current 25mA
Signal Line Isolation 2.5kV
Power Line Isolation 1.5kV


References, Links and Notes

  1. ADuM3160 Datasheet
  2. HLK-1D0505A Datasheet
  3. FSRV05-4 Datasheet
  4. Analog Devices Circuit Note CN0160




This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (


USB Isolator

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ID Name Designator Footprint Quantity BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier BOM_Supplier Part Price
1 1n C1,C2 C_0603 2 CL10B102KB8NNNC SAMSUNG LCSC C1588 0.004
2 100n C3,C4,C5,C6 C_0603 4 CC0603KRX7R9BB104 YAGEO LCSC C14663 0.003
3 4u7 C7,C8 C_0603 2 CL10A475KO8NNNC SAMSUNG LCSC C19666 0.014
4 100uF C9,C10 TANTALUM_CASE-C 2 TAJC107M016RNJ AVX LCSC C68621 0.4
5 FSRV05-4 D1,D2 SOT-23-6 2 FSRV05-4 FUXINSEMI LCSC C908218 0.039
6 5V1 D3 ZENER-SOD-123 1 MM1Z5V1 SEMTECH LCSC C81601 0.018
7 220R@100M FB1,FB2,FB3,FB4 L0603 4 UPZ1608E221-2R0TF Sunlord LCSC C98304 0.005
8 4.7uH L1,L2 L0603 2 CPY160808T-4R7M-NP Chilisin Elec LCSC C295681 0.015
9 PWR LED1 LED_0603 1 19-217/GHC-YR1S2/3T EVERLIGHT LCSC C72043 0.025
10 24R R1,R2,R3,R4,R8 0603 5 0603WAF240JT5E UniOhm LCSC C4198 0.001
11 10k R5,R6 0603 2 0603WAF1002T5E UniOhm LCSC C25804 0.001
12 1k R7 0603 1 0603WAF1001T5E UniOhm LCSC C21190 0.001
13 ADUM3160BRWZ U1 SOIC-16_L10.3-W7.5-P1.27-LS10.3-TL 1 ADUM3160BRWZ ADI LCSC C108501 5.323
14 HLK-1D0505A U2 HLK-1DXXXX_FLAT 1 HLK-1D0505A HI-LINK LCSC C465411 1.156
15 UPSTREAM USB1 USB-M-48-2 1 USB-05 SOFNG LCSC C112454 0.084
16 DOWNSTREAM USB2 USB-2.0-A-F 1 USB-A-F-90 LCSC LCSC C168708 0.147


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