Product details

Duplex Half Data rate (Max) (Mbps) 1 Isolation rating (Vrms) 2500 Integrated isolated power No Operating temperature range (C) -40 to 125 Fail safe Idle, Open, Short HBM ESD (kV) 16 Surge voltage capability (Vpk) 4000
Duplex Half Data rate (Max) (Mbps) 1 Isolation rating (Vrms) 2500 Integrated isolated power No Operating temperature range (C) -40 to 125 Fail safe Idle, Open, Short HBM ESD (kV) 16 Surge voltage capability (Vpk) 4000
SSOP (DBQ) 16 29 mm² 4.9 x 6
  • Meets or exceeds requirements of TIA/EIA-485-A
  • Half-duplex transceiver
  • Low-EMI 1-Mbps data rate
  • Bus I/O protection
    • ± 16 kV HBM ESD
  • 1.71-V to 5.5-V Logic-side supply (VCC1), 4.5-V to 5.5-V Bus-side supply (VCC2)
  • 1/8 Unit load: up to 256 nodes on bus
  • Failsafe receiver for bus open, short, and idle
  • 100-kV/µs (typical) High common-mode transient immunity
  • Extended temperature range from –40°C to +125°C
  • Glitch-free power-up and power-down for hot plug-in
  • Ultra-small SSOP (DBQ-16) package
  • Safety-related certifications:
    • 4242-VPK VIOTM and 566-VPK VIORM per DIN VDE V 0884-11:2017-01
    • 3000-VRMS Isolation for 1 minute per UL 1577
    • IEC 60950-1, IEC 62368-1 and IEC 61010-1 certifications
    • CQC, TUV, and CSA certifications
  • Meets or exceeds requirements of TIA/EIA-485-A
  • Half-duplex transceiver
  • Low-EMI 1-Mbps data rate
  • Bus I/O protection
    • ± 16 kV HBM ESD
  • 1.71-V to 5.5-V Logic-side supply (VCC1), 4.5-V to 5.5-V Bus-side supply (VCC2)
  • 1/8 Unit load: up to 256 nodes on bus
  • Failsafe receiver for bus open, short, and idle
  • 100-kV/µs (typical) High common-mode transient immunity
  • Extended temperature range from –40°C to +125°C
  • Glitch-free power-up and power-down for hot plug-in
  • Ultra-small SSOP (DBQ-16) package
  • Safety-related certifications:
    • 4242-VPK VIOTM and 566-VPK VIORM per DIN VDE V 0884-11:2017-01
    • 3000-VRMS Isolation for 1 minute per UL 1577
    • IEC 60950-1, IEC 62368-1 and IEC 61010-1 certifications
    • CQC, TUV, and CSA certifications

The ISO1500 device is a galvanically-isolated differential line transceiver for TIA/EIA RS-485 and RS-422 applications. This device has a 3-channel digital isolator and an RS-485 transceiver in an ultra-small 16-pin SSOP package. The bus pins of this transceiver are protected against IEC ESD contact discharge and IEC EFT events. The receiver output has a failsafe for bus open, short, and idle conditions. The small solution size of ISO1500 greatly reduces the board space required compared to other integrated isolated RS-485 solutions or discrete implementation with optocouplers and non-isolated RS-485 transceiver.

The device is used for long distance communications. Isolation breaks the ground loop between the communicating nodes, allowing for a much larger common mode voltage range. The symmetrical isolation barrier of each device is tested to provide 3000 VRMS of isolation for 1 minute per UL 1577 between the bus-line transceiver and the logic-level interface.

The ISO1500 device can operate from 1.71 V to 5.5 V on side 1 which lets the devices interface with low-voltage FPGAs and ASICs. The supply voltage on side 2 is from 4.5 V to 5.5 V. This device supports a wide operating ambient temperature range from –40°C to +125°C.

The ISO1500 device is a galvanically-isolated differential line transceiver for TIA/EIA RS-485 and RS-422 applications. This device has a 3-channel digital isolator and an RS-485 transceiver in an ultra-small 16-pin SSOP package. The bus pins of this transceiver are protected against IEC ESD contact discharge and IEC EFT events. The receiver output has a failsafe for bus open, short, and idle conditions. The small solution size of ISO1500 greatly reduces the board space required compared to other integrated isolated RS-485 solutions or discrete implementation with optocouplers and non-isolated RS-485 transceiver.

The device is used for long distance communications. Isolation breaks the ground loop between the communicating nodes, allowing for a much larger common mode voltage range. The symmetrical isolation barrier of each device is tested to provide 3000 VRMS of isolation for 1 minute per UL 1577 between the bus-line transceiver and the logic-level interface.

The ISO1500 device can operate from 1.71 V to 5.5 V on side 1 which lets the devices interface with low-voltage FPGAs and ASICs. The supply voltage on side 2 is from 4.5 V to 5.5 V. This device supports a wide operating ambient temperature range from –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet ISO1500 3-kVRMS Basic Isolated RS-485/RS-422 Transceiver in Ultra-Small Package datasheet (Rev. D) PDF | HTML 13 Feb 2020
Application note Isolated RS-485 Transceiver Reference Design (Rev. A) PDF | HTML 23 Sep 2022
Certificate CQC Certificate for ISOxxDBQ 02 Sep 2022
More literature Isolation for RS-485 PDF | HTML 21 Aug 2022
Certificate TUV Certificate for Isolation Devices (Rev. K) 05 Aug 2022
Certificate UL Certificate of Compliance File E181974 Vol 4 Sec 6 (Rev. P) 05 Aug 2022
Application note Robust Isolated RS-485 Enables New Industrial Applications (Rev. C) PDF | HTML 26 Jul 2022
Certificate VDE Certificate for Reinforced Isolation for DIN EN IEC 60747-17 (Rev. R) 12 Jul 2022
Application note How to Isolate RS-485 for Smallest Size and Highest Reliability (Rev. C) PDF | HTML 06 Jul 2022
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
Certificate CSA Certification (Rev. Q) 14 Jun 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen PDF | HTML 11 Jun 2021
Application note How to Isolate Signal and Power for an RS-485 System (Rev. C) PDF | HTML 25 May 2021
White paper Simplifying Signal Chain Design for High Performance in Small Systems 22 Oct 2020
Technical article The hidden cost of optocouplers for isolated RS-485 and CAN designs 28 Jan 2019
More literature Blog: Top 7 design questions about isolated RS-485 transceivers 06 Aug 2018
EVM User's guide ISO1500 Isolated RS-485 Half-Duplex Evaluation Module 06 Dec 2017

Design & development

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Evaluation board

ISO1500DBQEVM — ISO1500DBQ ultra-small package, isolated RS-485 evaluation module

The ISO1500DBQEVM is an evaluaiton module (EVM) used to evaluate the high-performance, reinforced isolated RS-485 ISO1500 in a small 16-pin package (package code DBQ). The EVM features enough test points and jumper options for you to evaluate the device with minimal external (...)
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Simulation model

ISO1500 IBIS MODEL

SLLM423.ZIP (92 KB) - IBIS Model
Package Pins Download
SSOP (DBQ) 16 View options

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