Part A
ADM4850ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7538 ПКС
- Package
- SOP-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM4850ARZ and ADM4853AR are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with matching supply voltage and pin function, making them a viable functional replacement candidate. However, the ADM4853AR offers a higher maximum data rate and a reduced slew-rate option, so the designer must confirm that the faster edge rate and associated EMI/termination behavior are acceptable for the target bus. Validation of the data-rate margin and fail-safe biasing is recommended before committing to the substitution.
Package Type
High match
Supply Voltage
High match
Maximum Data Rate
Validation required
Slew Rate / EMI Behavior
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM4850ARZ | ADM4853AR | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 10 Mbps | Determines the maximum communication speed the transceiver can support; a 40x difference means these parts are not speed-interchangeable. |
| Duplex Mode | Half-duplex | Full-duplex | Half-duplex shares one pair of wires for transmit and receive, while full-duplex uses separate pairs; this fundamentally changes bus wiring and pin usage. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Confirms each device provides one differential driver and one receiver, relevant for bus loading and topology planning. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (standard RS-485) | 1 unit load (standard RS-485) | Unit-load rating determines how many receivers can share a bus; both being 1 UL allows up to 32 nodes on a standard RS-485 bus. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V supply, so power rail compatibility is maintained between the two parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both are suitable for the same environmental conditions. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Same package and footprint allows drop-in PCB compatibility without layout changes. |
| Pin Count | 8 | 8 | Matching pin count supports physical interchangeability, though pin functions differ due to duplex mode. |
| Fail-Safe Receiver | Yes (open-circuit, short-circuit, idle-bus) | Yes (open-circuit, short-circuit, idle-bus) | Fail-safe receivers guarantee a defined logic output when the bus is idle or faulted, preventing spurious data in noisy networks. |
| ESD Protection (Bus Pins) | ±15 kV (HBM, per datasheet) | ±15 kV (HBM, per datasheet) | Robust ESD protection on the bus pins improves field reliability in harsh industrial environments. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4850ARZ | ADM4853AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 20 mV | - |
| Data Rate | 250kbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the ADM4850ARZ and ADM4853AR?
The ADM4850ARZ is a half-duplex RS-485/RS-422 transceiver with a 1 Mbps maximum data rate, while the ADM4853AR is a full-duplex RS-485/RS-422 transceiver with a 10 Mbps maximum data rate. The ADM4850ARZ is specified for 5 V operation, whereas the ADM4853AR operates from a 3.3 V supply. Both are offered in 8-lead SOIC packages, but their duplex configuration, data rate, and supply voltage differ.
Are the ADM4850ARZ and ADM4853AR pin-compatible?
No. The ADM4850ARZ is a half-duplex device with driver and receiver sharing the same differential bus pins (A and B), while the ADM4853AR is a full-duplex device with separate driver outputs (Y and Z) and receiver inputs (A and B). The pin functions therefore differ, and the two parts are not directly interchangeable on the same PCB layout.
What supply voltage does each device require?
The ADM4850ARZ operates from a single 5 V supply. The ADM4853AR operates from a single 3.3 V supply. Designs must provide the correct supply rail and decoupling for the selected device.
What are the maximum data rates of the ADM4850ARZ and ADM4853AR?
The ADM4850ARZ supports data rates up to 1 Mbps. The ADM4853AR supports data rates up to 10 Mbps. The higher data rate of the ADM4853AR makes it suitable for faster bus applications, provided the bus length and termination are appropriate.
Do these transceivers support half-duplex or full-duplex operation?
The ADM4850ARZ is a half-duplex transceiver, using a single differential pair for both transmit and receive. The ADM4853AR is a full-duplex transceiver, using separate differential pairs for driver outputs and receiver inputs, allowing simultaneous transmit and receive.
What package type do the ADM4850ARZ and ADM4853AR use?
Both the ADM4850ARZ and ADM4853AR are supplied in 8-lead SOIC packages. The "ARZ" and "AR" suffixes in the part numbers denote the SOIC package and temperature/performance grade per the manufacturer's ordering guide.
Can the ADM4850ARZ and ADM4853AR be used in the same RS-485 network?
They can coexist on the same RS-485 bus only if the network is wired for the appropriate duplex configuration and all nodes comply with the same signaling and termination requirements. Because one is half-duplex and the other full-duplex, the bus topology and wiring must be designed accordingly; they are not drop-in replacements for each other.