Part A
ADM483EARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6730 PCS
- Package
- SOIC-8
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM483EARZ and ADM4856AR are both half-duplex RS-485 transceivers in 8-pin SOIC packages with 5 V supply and similar data rates, making them a viable functional replacement candidate. However, the ADM483EARZ provides ±15 kV ESD protection and a reduced slew rate for lower EMI, while the ADM4856AR offers a higher 20 Mbps data rate with standard ESD ratings. Designers should validate ESD robustness, data rate margin, and fail-safe behavior against the target application before substituting.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
ESD Protection
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 | ADM483EARZ | ADM4856AR | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 20 Mbps | Maximum signaling speed; the ADM4856AR supports much higher throughput, so it is not a drop-in replacement where the bus runs at high speed. |
| Duplex Mode | Half-duplex | Full-duplex | Determines whether transmit and receive can occur simultaneously; full-duplex parts require separate A/B and Y/Z pairs and different cabling. |
| Number of Drivers/Receivers | 1 driver / 1 receiver | 1 driver / 1 receiver | Defines the transceiver channel count; both are single-channel, so channel count alone does not differentiate them. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V rail, so the power supply architecture is compatible between the two parts. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Bus-pin ESD robustness affects field reliability in harsh RS-485 environments; both offer comparable protection. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range compatibility ensures both parts suit the same environmental conditions. |
| Package | 8-lead SOIC | 8-lead SOIC | Footprint and pinout compatibility; matching packages simplify board-level substitution. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Fail-safe receivers guarantee a defined logic output when the bus is idle or open, preventing spurious data. |
| Low-Power Shutdown | Yes | Yes | Shutdown capability reduces standby current in battery or power-sensitive designs; both support it. |
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 | ADM483EARZ | ADM4856AR |
|---|---|---|
| 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 | 4.5V ~ 5.5V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 70 mV | - |
| Data Rate | 250kbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary functional differences between the ADM483EARZ and the ADM4856AR?
The ADM483EARZ is a ±15 kV ESD-protected, low-power, half-duplex RS-485/RS-422 transceiver specified for data rates up to 250 kbps. The ADM4856AR is a ±15 kV ESD-protected, full-duplex RS-485/RS-422 transceiver specified for data rates up to 2.5 Mbps. The key differences are duplex configuration (half-duplex vs. full-duplex) and maximum data rate (250 kbps vs. 2.5 Mbps).
Are the ADM483EARZ and ADM4856AR pin-compatible?
No. The ADM483EARZ is supplied in an 8-lead SOIC package with a half-duplex pinout (RO, RE, DE, DI, GND, A, B, VCC). The ADM4856AR is supplied in a 14-lead SOIC package with a full-duplex pinout (including separate A/B driver outputs and Y/Z receiver inputs). The different package sizes and pin functions prevent direct pin-to-pin substitution.
Can the ADM483EARZ and ADM4856AR be used interchangeably in an existing RS-485 design?
No, not without design changes. The ADM483EARZ is a half-duplex transceiver, while the ADM4856AR is a full-duplex transceiver. Full-duplex operation requires four bus wires (two differential pairs) versus two for half-duplex, and the PCB land patterns differ (8-lead vs. 14-lead SOIC). The higher 2.5 Mbps rate of the ADM4856AR also requires appropriate bus termination and layout considerations.
What are the maximum data rates of the ADM483EARZ and ADM4856AR?
The ADM483EARZ supports data rates up to 250 kbps. The ADM4856AR supports data rates up to 2.5 Mbps. Both figures are specified by Analog Devices in the respective datasheets.
What ESD protection levels do the ADM483EARZ and ADM4856AR provide on their bus pins?
Both devices provide ±15 kV ESD protection on their RS-485/RS-422 bus pins, specified per the Human Body Model (HBM) and IEC 61000-4-2 contact discharge, as stated in the Analog Devices datasheets.
What are the supply voltage and operating temperature ranges for the ADM483EARZ and ADM4856AR?
Both devices operate from a single 5 V ±5% supply. The ADM483EARZ is specified over the industrial temperature range of −40°C to +85°C. The ADM4856AR is specified over the industrial temperature range of −40°C to +85°C. These ranges are confirmed in the respective Analog Devices datasheets.
How do the quiescent supply currents of the ADM483EARZ and ADM4856AR compare?
The ADM483EARZ is a low-power transceiver with a typical quiescent supply current of 300 µA in receive mode (driver disabled). The ADM4856AR has a higher typical quiescent supply current, specified in its datasheet, reflecting its higher-speed full-duplex architecture. Designers should consult the respective datasheets for exact operating and shutdown current specifications.
Which device is better suited for a multi-point bus with many nodes?
The ADM483EARZ is a half-duplex transceiver well suited to standard two-wire multi-point RS-485 buses, supporting up to 32 unit loads (one unit load per transceiver). The ADM4856AR is a full-duplex transceiver intended for four-wire point-to-point or multi-drop configurations. For a conventional two-wire multi-point bus, the ADM483EARZ is the appropriate choice; the ADM4856AR is used where full-duplex communication is required.