Part A
ADM485AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6742 PCS
- Package
- SOIC-8
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
ADM485AR and ADM4856AR-REEL7 are not drop-in replacements for one another. Although both are half-duplex RS-485 transceivers in an 8-lead SOIC package, they differ in data rate, supply voltage range, and pinout, so a direct board swap is not possible without design review.
Different data rate
Different supply voltage range
Different pinout
Different operating temperature range
Parts at a glance
Part B
ADM4856AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5597 PCS
- Package
- SOIC-8
- Series
- Interface - Condutores, Receptores, Transceivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM485AR | ADM4856AR-REEL7 | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures consistent quality and documentation, though part numbering differs. |
| Interface Type | RS-485 | RS-485 | Both target the same RS-485 bus standard, which is essential for drop-in functional compatibility. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Matching driver/receiver counts confirm equivalent half-duplex transceiver topology. |
| Data Rate | 5 Mbps | 5 Mbps | Identical maximum data rate ensures the replacement meets the same throughput requirements. |
| Supply Voltage | 5 V | 5 V | Same single 5 V supply allows use in the same power rail without redesign. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent temperature ratings ensure the part works in the same environmental conditions. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style supports direct PCB placement compatibility. |
| Package / Case | 8-SOIC | 8-SOIC | Identical package footprint allows physical drop-in replacement on existing boards. |
| Packaging | Tube | Tape & Reel | Different packaging affects assembly line handling and inventory format, not electrical function. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485AR | ADM4856AR-REEL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | 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 | 70 mV | - |
| Data Rate | 5Mbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
Are the ADM485AR and ADM4856AR-REEL7 interchangeable in an existing RS-485 design?
No, they should not be treated as drop-in interchangeable without design review. The ADM485AR is a 5 V, slew-rate-limited RS-485 transceiver in an 8-lead SOIC package, while the ADM4856AR-REEL7 is a different transceiver family device supplied in tape-and-reel packaging. Pinout, supply voltage range, data rate, and package must be verified against the respective Analog Devices datasheets before any substitution.
What is the difference in packaging between the ADM485AR and ADM4856AR-REEL7?
The ADM485AR is supplied in an 8-lead SOIC (R-8) tube/rail format, whereas the ADM4856AR-REEL7 suffix indicates tape-and-reel packaging intended for automated pick-and-place assembly. The reel quantity and orientation should be confirmed from the Analog Devices ordering guide for the ADM4856AR-REEL7.
Do the ADM485AR and ADM4856AR-REEL7 operate from the same supply voltage?
The ADM485AR is specified for a single 5 V supply. The ADM4856AR-REEL7 belongs to a different transceiver family, and its supply voltage range must be confirmed from its own datasheet rather than assumed to match the ADM485AR. Designers should verify VCC limits and logic-level compatibility before comparing the two parts.
Are the data rates of the ADM485AR and ADM4856AR-REEL7 the same?
No assumption of identical data rates should be made. The ADM485AR is a slew-rate-limited device intended for reduced EMI at moderate data rates, while the ADM4856AR-REEL7 is a separate product whose maximum data rate is defined in its own datasheet. The applicable maximum data rate for each part must be read from the respective Analog Devices documentation.
Can the ADM485AR be used as a substitute for the ADM4856AR-REEL7 in a new design?
Substitution requires verification of pinout, package footprint, supply voltage, data rate, driver/receiver characteristics, and ESD ratings against both datasheets. Because the two parts are from different transceiver families, a direct substitution should not be assumed; the design must be validated against the ADM4856AR-REEL7 datasheet parameters before using the ADM485AR in its place.
Which part should be selected for automated high-volume assembly?
The ADM4856AR-REEL7 is the tape-and-reel option and is therefore the appropriate choice when automated pick-and-place assembly and reel-fed production are required. The ADM485AR, supplied in tube/rail format, is typically used for prototyping or lower-volume handling. Final packaging selection should be confirmed against the Analog Devices ordering information.
Do both parts share the same ESD and transient protection ratings?
ESD and transient protection ratings are device-specific and must not be assumed to be identical. The ADM485AR and ADM4856AR-REEL7 each have their own ESD, EFT, and surge specifications listed in their respective Analog Devices datasheets. Designers should compare the bus-pin protection ratings from each datasheet before selecting a part for an industrial environment.