ADM4850ARZ Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The ADM4850ARZ is an EIA-485/EIA-422 half-duplex line transceiver from Analog Devices featuring differential Schmitt trigger inputs, 1 µA maximum high-level input current, and a single driver/receiver pair in an 8-pin SOIC package. It is designed for robust RS-485 multi-drop communication in industrial and building automation networks.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- ADM4850ARZ Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- EIA-485 and EIA-422 compliant differential line transceiver
- Differential Schmitt trigger receiver input for noise immunity on long cables
- 1 µA maximum high-level input current for minimal bus loading
- Single driver and receiver for half-duplex RS-485 multi-drop networks
- Differential output for balanced 120-Ω twisted-pair transmission
- 8-pin SOIC package for compact RS-485 interface designs
Applications
The ADM4850ARZ is used in industrial RS-485 networks for multi-drop communication between PLCs, sensors, and motor drives over cable runs exceeding 100 meters. It serves as the physical layer interface in building automation systems using protocols such as Modbus RTU and BACnet MS/TP, which rely on half-duplex EIA-485 transceivers. The device is also deployed in process control transmitters, HVAC controllers, and remote I/O modules where differential signaling provides immunity to common-mode noise in electrically noisy environments.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | R-8 |
| YTEOL | 10 |
| Differential Output | YES |
| Driver Number of Bits | 1 |
| High Level Input Current-Max | 0.000001A |
| Input Characteristics | DIFFERENTIAL SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-422; EIA-485 |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Out Swing-Min | 1.5V |
| Output Characteristics | 3-STATE |
| Output Low Current-Max | 0.004A |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Receive Delay-Max | 1000ns |
| Receiver Number of Bits | 1 |
| Supply Current-Max | 0.5mA |
| Supply Voltage-Max | 5.25V |
| Supply Voltage-Min | 4.75V |
| Supply Voltage-Nom | 5V |
| Supply Voltage1-Max | 5.25V |
| Supply Voltage1-Min | 4.75V |
| Supply Voltage1-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 2500ns |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Taiwan |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Which communication standards does the ADM4850ARZ support, and what cable topology is it designed for?
The ADM4850ARZ supports both EIA-485 and EIA-422 differential communication standards, making it compatible with RS-485 multi-drop bus topologies using 120 Ω terminated twisted-pair cables. EIA-485 mode allows up to 32 unit loads on a single bus, while EIA-422 mode supports point-to-point or multi-drop configurations at data rates up to several Mbps.
How does the differential Schmitt trigger input of the ADM4850ARZ improve noise rejection?
The differential Schmitt trigger receiver in the ADM4850ARZ adds hysteresis to the differential input threshold, typically around 50 mV to 200 mV, which prevents false toggling on noisy bus lines where reflections or common-mode noise can cause the differential signal to hover near the 0 V threshold. This is critical in industrial environments where 120 Ω RS-485 cables may run alongside motor drive cables carrying hundreds of volts.
How many devices can share an RS-485 bus when using the ADM4850ARZ, and what limits the count?
The ADM4850ARZ presents a standard 1 unit load on the RS-485 bus, allowing up to 32 standard-load devices on a single differential bus segment. The 1 µA maximum high-level input current ensures minimal DC loading on the bus, and the differential driver output can drive a 54 Ω load (the parallel combination of 120 Ω termination and 32 unit loads of approximately 12 kΩ each).
For which industrial protocol implementations is the ADM4850ARZ a commonly specified transceiver?
The ADM4850ARZ is commonly specified for Modbus RTU, BACnet MS/TP, PROFIBUS DP, and DMX512 implementations that all use the EIA-485 physical layer. These protocols operate at baud rates from 1200 bps up to 12 Mbps (for PROFIBUS), and the ADM4850ARZ half-duplex architecture supports the direction-switched master-slave communication model used by all these protocols over twisted-pair cables up to 1200 meters at lower baud rates.
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