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

All trademarks are the property of their respective owners.

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

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 14
Type Title Date
* Data sheet ISO1500 3-kVRMS Basic Isolated RS-485/RS-422 Transceiver in Ultra-Small Package datasheet (Rev. D) Feb. 13, 2020
More literature UL Certification (Rev. O) Feb. 03, 2021
White paper Simplifying Signal Chain Design for High Performance in Small Systems Oct. 22, 2020
More literature TUV certificate for isolation devices (Rev. I) Mar. 14, 2020
More literature CSA Certification (Rev. P) Nov. 19, 2019
More literature VDE certificate for reinforced isolation for DIN VDE V 0884-11:2017-01 (Rev. N) Nov. 13, 2019
More literature CQC Certification (Rev. F) Sep. 13, 2019
Application note Isolated RS-485 Transceiver Reference Design May 10, 2019
Technical article The hidden cost of optocouplers for isolated RS-485 and CAN designs Jan. 28, 2019
Application note How to isolate RS-485 for smallest size and highest reliability (Rev. A) Oct. 18, 2018
Application note How to isolate signal and power for an RS-485 system (Rev. B) Oct. 16, 2018
Application note Robust isolated RS-485 enables new industrial applications (Rev. A) Aug. 13, 2018
More literature Blog: Top 7 design questions about isolated RS-485 transceivers Aug. 06, 2018
User guide ISO1500 Isolated RS-485 Half-Duplex Evaluation Module Dec. 06, 2017

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

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​