1-Mbps, half-duplex, 3-kVrms ultra-small isolated RS-485 & RS-422 transceiver


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 open-in-new Find other Isolated RS-485 transceivers

Package | Pins | Size

SSOP (DBQ) 16 29 mm² 4.9 x 6 open-in-new Find other Isolated RS-485 transceivers


  • 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
open-in-new Find other Isolated RS-485 transceivers


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.

open-in-new Find other Isolated RS-485 transceivers

Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
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 components.
  • Robust EMC isolated RS-485
  • Isolation barrier life > 25 years

Design tools & simulation

SLLM423.ZIP (92 KB) - IBIS Model

CAD/CAE symbols

Package Pins Download
SSOP (DBQ) 16 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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