RS-485 & RS-422
The RS-485 specification meets the requirements for a truly multipoint communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus. Some RS-485 transceivers modify the input impedance to allow up to 8× more nodes to be connected to the same bus. Analog Devices offers a wide range of standard RS-485/RS-422 transceivers and iCoupler® isolated RS-485/RS-422 transceivers to suit many applications.
Product Selection Table
Latest Resources
Application Notes
Technical Articles
- Balancing the Major Elements of an Isolator for Safety's Sake
- RS-485 Communication Link vs. the Electric Fence: A Demonstration of RS-485 EMC Robustness
- Creepage Requirements for Medical Applications
- Safeguard Your RS485 Communication Networks from Harmful EMC Events PDF
- MS-2155: Options and Solutions for Partitioning Isolated Power in Isolated RS-485 Nodes PDF
User Guides
- iCoupler,_Isolated_RS-485_Transceiver____________ab1e8f28-6615-4143-b3c2-40f53c7b6605> UG-496: Evaluating the ADM2490E—5 kV, Signal Isolated, High Speed, 16 Mbps, ESD Protected, Full Duplex, iCoupler, Isolated RS-485 Transceiver PDF
- UG-464: Evaluating the ADM4168E ±15 kV ESD Protected Dual RS-422 Transceiver PDF
- UG-543:Evaluation Boards for Full-Duplex and Half-Duplex RS-485 Transceivers PDF
- UG-311: Reliability Handbook PDF
- UG-317: Evaluation Board for the ADM2682E/ADM2687E 5 kV rms Signal and Power Isolated RS-485 Transceivers with ±15 kV ESD Protection PDF
- UG-316: Evaluation Board for the ADM2481 2.5 kV Signal Isolated, 500 kbps, Half-Duplex RS-485 Transceiver PDF
- UG-302: Evaluation Board for the ADM2491E ±8 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver PDF
- UG-213: Evaluation Board for the ADM2485 Half-Duplex, Isolated RS-485 Transceiver with Transformer Driver PDF
- UG-210: Evaluation Boards for the ADM2482E and ADM2487E Isolated RS-485 Transceivers PDF
Circuit Notes
RS-485 & RS-422
| SortOrder | Part# | Interface Protocol | Data Rate (max) (bps) | Number Rx | Number Tx | Full or Half Duplex Operation | ESD Protection (V) | Fail Safe | Vs+ (min) (V) | Vs+ (max) (V) | US Price 1000 to 4999 ($ US) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ADM3062E | RS-485 | 500k | 1 | 1 | Half | 30k | Idle, Open, Short | 3 | 5.5 | $1.07 (ADM3062EACPZ) |
| 2 | ADM3061E | RS-485 | 500k | 1 | 1 | Half | 30k | Idle, Open, Short | 3 | 5.5 | $1.05 (ADM3061EARMZ) |
| 3 | LTC2862A-2 | -422, TIA/EIA-485 | 20M | 1 | 1 | Half-Duplex | 40 | Idle, Open, Short | 3 | 5.5 | $2.35 (LTC2862ACS8-2#PBF) |
| 4 | LTC2862A-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Half-Duplex | 40 | Idle, Open, Short | 3 | 5.5 | $2.35 (LTC2862ACS8-1#PBF) |
| 5 | ADM3066E | RS-485 | 50M | 1 | 1 | Half | 30k | Idle, Open, Short | 3 | 5.5 | $1.23 (ADM3066EACPZ-R7) |
| 6 | LTC1690 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 6 | $1.65 (LTC1690CN8#PBF) |
| 7 | ADM3095E | RS-485 | 2.5M | 1 | 1 | Half | 30k | Idle, Open, Short | 3 | 5.5 | $4.50 (ADM3095EARZ-RL7) |
| 8 | ADM3065E | RS-485 | 50M | 1 | 1 | Half | 30k | Idle, Open, Short | 3 | 5.5 | $1.21 (ADM3065EARMZ-R7) |
| 9 | LTC2877 | PROFIBUS IEC 61158-2, RS485 | 2.5M | 1 | 1 | PROFIBUS IEC 61158-2 Compliant | 52 | Open, Shorted, Terminated | 3 | 5.5 | $2.73 (LTC2877CMSE#PBF) |
| 10 | LTC2876 | PROFIBUS IEC 61158-2, RS485 | 20M | 1 | 1 | PROFIBUS IEC 61158-2 Compliant | 52 | Open, Shorted, Terminated | 3 | 5.5 | $2.48 (LTC2876CDD#PBF) |
| 11 | ADM4168E | RS-422 | - | - | - | Half | - | - | - | 5 | $0.80 (ADM4168EBRUZ-RL7) |
| 12 | LTC2865 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3 | 5.5 | $2.65 (LTC2865CMSE#PBF) |
| 13 | LTC2864-2 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3 | 5.5 | $2.55 (LTC2864CS-2#PBF) |
| 14 | LTC2864-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3 | 5.5 | $2.55 (LTC2864CS-1#PBF) |
| 15 | LTC2863-2 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3 | 5.5 | $2.35 (LTC2863CS8-2#PBF) |
| 16 | LTC2863-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3 | 5.5 | $2.35 (LTC2863CS8-1#PBF) |
| 17 | LTM2881-5 | PROFIBUS, RS422, RS485 | 20M | 1 | 1 | Full-Duplex, Half-Duplex, Isolated Transceiver | 15 | Idle, Open, Short | 1.62 | 5.5 | $8.45 (LTM2881CY-5#PBF) |
| 18 | LTM2881-3 | PROFIBUS, RS422, RS485 | 20M | 1 | 1 | Full-Duplex, Half-Duplex, Isolated Transceiver | 15 | Idle, Open, Short | 1.62 | 5.5 | $8.45 (LTM2881CY-3#PBF) |
| 19 | ADM489A | RS-422, RS-485 | 250k | 1 | 1 | Full | - | Open | 4.5 | 5.5 | $1.08 (ADM489ABRZ) |
| 20 | ADM488A | RS-422, RS-485 | 250k | 1 | 1 | Full | - | Open | 4.5 | 5.5 | $0.93 (ADM488ABRZ) |
| 21 | ADM1490E | RS-422, RS-485 | 16M | 1 | 1 | Full | 8k | Open | 4.75 | 5.25 | $1.18 (ADM1490EBRZ) |
| 22 | ADM1491E | RS-422, RS-485 | 16M | 1 | 1 | Full | 8k | Open | 4.75 | 5.25 | $1.18 (ADM1491EBRZ-REEL7) |
| 23 | ADM487E | RS-422, RS-485 | 250k | 1 | 1 | Half | 15k | Open | 4.75 | 5.25 | $1.36 (ADM487EARZ-REEL7) |
| 24 | ADM485E | RS-422, RS-485 | 2.5M | 1 | 1 | Half | 15k | Open | 4.75 | 5.25 | $0.98 (ADM485EARZ) |
| 25 | ADM1487E | RS-422, RS-485 | 2.5M | 1 | 1 | Half | 15k | Open | 4.75 | 5.25 | $0.98 (ADM1487EARZ) |
| 26 | ADM3491E | RS-422, RS-485 | 12M | 1 | 1 | Full | 15k | Open | 3 | 3.6 | $1.46 (ADM3491EARZ) |
| 27 | ADM3490E | RS-422, RS-485 | 12M | 1 | 1 | Full | 15k | Open | 3 | 3.6 | $1.41 (ADM3490EARZ-REEL7) |
| 28 | ADM3488E | RS-422, RS-485 | 250k | 1 | 1 | Full | 15k | Open | 3 | 3.6 | $1.36 (ADM3488EARZ-REEL7) |
| 29 | ADM3486E | RS-422, RS-485 | 2.5M | 1 | 1 | Half | 15k | Open | 3 | 3.6 | $1.36 (ADM3486EARZ-REEL7) |
| 30 | ADM3483E | RS-422, RS-485 | 250k | 1 | 1 | Half | 15k | Open | 3 | 3.6 | $1.36 (ADM3483EARZ) |
| 31 | ADM3078E | RS-422, RS-485 | 16M | 1 | 1 | Half | 15k | Idle, Open, Short | 3 | 3.6 | $1.60 (ADM3078EARZ) |
| 32 | ADM3077E | RS-422, RS-485 | 16M | 1 | 1 | Full | 15k | Idle, Open, Short | 3 | 3.6 | $1.62 (ADM3077EARZ-REEL7) |
| 33 | ADM3076E | RS-422, RS-485 | 16M | 1 | 1 | Full | 15k | Idle, Open, Short | 3 | 3.6 | $1.67 (ADM3076EARZ) |
| 34 | ADM3075E | RS-422, RS-485 | 500k | 1 | 1 | Half | 15k | Idle, Open, Short | 3 | 3.6 | $1.57 (ADM3075EARZ-REEL7) |
| 35 | ADM3074E | RS-422, RS-485 | 500k | 1 | 1 | Full | 15k | Idle, Open, Short | 3 | 3.6 | $1.62 (ADM3074EARZ) |
| 36 | ADM3073E | RS-422, RS-485 | 500k | 1 | 1 | Half | 15k | Idle, Open, Short | 3 | 3.6 | $1.67 (ADM3073EARZ-REEL7) |
| 37 | ADM3072E | RS-422, RS-485 | 250k | 1 | 1 | Half | 15k | Idle, Open, Short | 3 | 3.6 | $1.57 (ADM3072EARZ) |
| 38 | ADM3071E | RS-422, RS-485 | 250k | 1 | 1 | Full | 15k | Idle, Open, Short | 3 | 3.6 | $1.62 (ADM3071EARZ) |
| 39 | ADM3070E | RS-422, RS-485 | 250k | 1 | 1 | Full | 15k | Idle, Open, Short | 3 | 3.6 | $1.67 (ADM3070EARZ) |
| 40 | LTC2858-2 | RS422, RS485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.55 (LTC2858CMS-2#PBF) |
| 41 | LTC2858-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.55 (LTC2858CMS-1#PBF) |
| 42 | LTC2857-2 | RS422, RS485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.55 (LTC2857CMS8-2#PBF) |
| 43 | LTC2857-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.55 (LTC2857CMS8-1#PBF) |
| 44 | LTC2856-2 | RS422, RS485 | 20M | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.45 (LTC2856CMS8-2#PBF) |
| 45 | LTC2856-1 | -422, TIA/EIA-485 | 250k | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.45 (LTC2856CMS8-1#PBF) |
| 46 | LTC2861 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.70 (LTC2861CGN#PBF) |
| 47 | LTC2859 | -422, TIA/EIA-485 | 20M | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 5 | 5.5 | $1.55 (LTC2859CDD#PBF) |
| 48 | LTC2855 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3.3 | 5.5 | $1.70 (LTC2855CDE#PBF) |
| 49 | LTC2854 | -422, TIA/EIA-485 | 20M | 1 | 1 | Half-Duplex | 25 | Idle, Open, Short | 3.3 | 5.5 | $1.55 (LTC2854CDD#PBF) |
| 50 | LTC2852 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3.3 | 5.5 | $1.55 (LTC2852CDD#PBF) |
| 51 | LTC2851 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 3.3 | 5.5 | $1.55 (LTC2851CS8#PBF) |
| 52 | LTC2850 | -422, TIA/EIA-485 | 20M | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 3.3 | 5.5 | $1.45 (LTC2850CDD#PBF) |
| 53 | ADM3493 | RS-422, RS-485 | 250k | 1 | 1 | Half | - | Open | 3 | 3.6 | $0.99 (ADM3493ARZ-REEL7) |
| 54 | ADM3490 | RS-422, RS-485 | 10M | 1 | 1 | Full | - | Open | 3 | 3.6 | $1.04 (ADM3490ARZ) |
| 55 | ADM3488 | RS-422, RS-485 | 250k | 1 | 1 | Full | - | Open | 3 | 3.6 | $0.94 (ADM3488ARZ-REEL7) |
| 56 | ADM3485 | RS-422, RS-485 | 10M | 1 | 1 | Half | - | Open | 3 | 3.6 | $1.04 (ADM3485ARZ-REEL7) |
| 57 | ADM3483 | RS-422, RS-485 | 250k | 1 | 1 | Half | - | Open | 3 | 3.6 | $0.94 (ADM3483ARZ-REEL7) |
| 58 | ADM4857 | RS-422, RS-485 | 10M | 1 | 1 | Full | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4857ARZ) |
| 59 | ADM4856 | RS-422, RS-485 | 2.5M | 1 | 1 | Full | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4856ARZ-REEL7) |
| 60 | ADM4855 | RS-422, RS-485 | 500k | 1 | 1 | Full | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4855ARZ) |
| 61 | ADM4854 | RS-422, RS-485 | 115k | 1 | 1 | Full | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4854ARZ) |
| 62 | ADM4853 | RS-422, RS-485 | 10M | 1 | 1 | Half | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4853ARZ-REEL7) |
| 63 | ADM4852 | RS-422, RS-485 | 2.5M | 1 | 1 | Half | - | Open, Short | 4.75 | 5.25 | $0.73 (ADM4852ACPZ-REEL7) |
| 64 | ADM4851 | RS-422, RS-485 | 500k | 1 | 1 | Half | - | Open, Short | 4.75 | 5.25 | $0.82 (ADM4851ARZ) |
| 65 | ADM4850 | RS-422, RS-485 | 115k | 1 | 1 | Half | - | Open, Short | 4.75 | 5.25 | $0.73 (ADM4850ACPZ-REEL7) |
| 66 | ADM483 | RS-422, RS-485 | 250k | 1 | 1 | Half | - | Open | 4.75 | 5.25 | $0.69 (ADM483JRZ) |
| 67 | ADM1486 | RS-422, RS-485 | 30M | 1 | 1 | Half | - | Open | 4.75 | 5.25 | $1.20 (ADM1486ARZ-REEL) |
| 68 | LTC1535 | -422, TIA/EIA-485 | 52M | 1 | 1 | Full-Duplex, Isolated Transceiver | 8 | Idle, Open, Short | 4.5 | 5.5 | $5.35 (LTC1535CSW#PBF) |
| 69 | LTC1689 | -422, TIA/EIA-485 | 5M | - | 4 | Quad Driver | 4 | - | 3 | 5.5 | $4.95 (LTC1689CS#PBF) |
| 70 | LTC1688 | -422, TIA/EIA-485 | 100M | - | 4 | Quad Driver | 4 | - | 3 | 5.5 | $4.95 (LTC1688CS#PBF) |
| 71 | LT1791 | -422, TIA/EIA-485 | 2.5M | 1 | 1 | Full-Duplex | 15 | Idle, Open, Short | 4.75 | 5.25 | $2.15 (LT1791CN#PBF) |
| 72 | LT1785 | -422, TIA/EIA-485 | 250k | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 4.75 | 5.25 | $1.95 (LT1785CN8#PBF) |
| 73 | LTC1484 | -422, TIA/EIA-485 | 10M | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 4.5 | 5.5 | $1.65 (LTC1484CN8#PBF) |
| 74 | LTC1482 | -422, TIA/EIA-485 | 150k | 1 | 1 | Half-Duplex | 15 | Idle, Open, Short | 4.5 | 5.5 | $1.95 (LTC1482CN8#PBF) |
| 75 | ADM3485E | RS-422, RS-485 | 12M | 1 | 1 | Half | 15k | Open | 3 | 3.6 | $1.45 (ADM3485EARZ) |
| 76 | ADM3491 | RS-422, RS-485 | 10M | 1 | 1 | Full | - | Open | 3 | 3.6 | $1.51 (ADM3491ARZ) |
| 77 | ADM489 | RS-422, RS-485 | 250k | 1 | 1 | Full | - | Open | 4.5 | 5.5 | $1.96 (ADM489ARUZ) |
| 78 | ADM488 | RS-422, RS-485 | 250k | 1 | 1 | Full | - | Open | 4.5 | 5.5 | $1.34 (ADM488ANZ) |
| 79 | LTC1687 | -422, TIA/EIA-485 | 100M | 1 | 1 | Full-Duplex | 4 | Open | 5 | 6 | $4.20 (LTC1687CS#PBF) |
| 80 | LTC1686 | -422, TIA/EIA-485 | 52M | 1 | 1 | Full-Duplex | 4 | Open | 5 | 6 | $4.20 (LTC1686CS8#PBF) |
| 81 | LTC1685 | -422, TIA/EIA-485 | 52M | 1 | 1 | Half-Duplex | 4 | Idle, Open, Short | 5 | 6 | $2.95 (LTC1685CS8#PBF) |
| 82 | LTC1519 | -422, TIA/EIA-485 | 50M | 4 | - | Quad Receiver | 4 | Idle, Open, Short | 4.5 | 5.5 | $5.35 (LTC1519CS#PBF) |
| 83 | LTC1518 | -422, TIA/EIA-485 | 52M | 4 | - | Quad Receiver | 4 | Idle, Open, Short | 4.5 | 5.5 | $5.35 (LTC1518CS#PBF) |
| 84 | ADM483E | RS-422, RS-485 | 250k | 1 | 1 | Half | 15k | Open | 4.5 | 5.5 | $1.40 (ADM483EARZ) |
| 85 | LTC1520 | -422, TIA/EIA-485 | 350k | 4 | - | Quad Receiver | 4 | - | 4.5 | 5.5 | $5.35 (LTC1520CS#PBF) |
| 86 | LTC1480 | -422, TIA/EIA-485 | 2.5M | 1 | 1 | Half-Duplex | - | Open | 4.5 | 5.5 | $2.55 (LTC1480CN8#PBF) |
| 87 | LTC1487 | -422, TIA/EIA-485 | 52M | 1 | 1 | Half-Duplex | 10 | Open | 4.5 | 5.5 | $1.45 (LTC1487CN8#PBF) |
| 88 | LTC1483 | -422, TIA/EIA-485 | 4M | 1 | 1 | Half-Duplex | 10 | Open | 4.5 | 5.5 | $1.45 (LTC1483CN8#PBF) |
| 89 | LTC1481 | -422, TIA/EIA-485 | 4M | 1 | 1 | Half-Duplex | 10 | Open | 4.5 | 5.5 | $1.45 (LTC1481CN8#PBF) |
| 90 | ADM485 | RS-422, RS-485 | 5M | 1 | 1 | Half | - | Open | 4.75 | 5.25 | $0.90 (ADM485JRZ) |
| 91 | ADM1485 | RS-422, RS-485 | 30M | 1 | 1 | Half | - | Open | 4.75 | 5.25 | $1.10 (ADM1485JRZ-REEL) |
| 92 | LTC490 | -422, TIA/EIA-485 | 2.5M | 1 | 1 | Full-Duplex | 2 | Open | 4.75 | 5.25 | $2.40 (LTC490CN8#PBF) |
| 93 | LTC1485 | -422, TIA/EIA-485 | 250k | 1 | 1 | Half-Duplex | 10 | Open | 4.5 | 5.5 | $1.60 (LTC1485CN8#PBF) |
| 94 | LTC491 | -422, TIA/EIA-485 | 20M | 1 | 1 | Full-Duplex | 2 | Open | 4.75 | 5.25 | $2.65 (LTC491CN#PBF) |
| 95 | LTC489 | -422, TIA/EIA-485 | 2.5M | 4 | - | Quad Receiver | 4 | Open | 4.75 | 5.25 | $3.55 (LTC489CN#PBF) |
| 96 | LTC488 | -422, TIA/EIA-485 | 10M | 4 | - | Quad Receiver | 2 | Open | 4.75 | 5.25 | $3.55 (LTC488CN#PBF) |
| 97 | LTC487 | -422, TIA/EIA-485 | 10M | - | 4 | Quad Driver | 2 | Open | 4.75 | 5.25 | $3.55 (LTC487CN#PBF) |
| 98 | LTC486 | -422, TIA/EIA-485 | 10M | - | 4 | Quad Driver | 2 | Open | 4.75 | 5.25 | $3.55 (LTC486CN#PBF) |
| 99 | LTC485 | -422, TIA/EIA-485 | 10M | 1 | 1 | Half-Duplex | 4 | Open | 4.75 | 5.25 | $1.30 (LTC485CN8#PBF) |
