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 ADM4857AR are both half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages with 5 V supply operation, making them functionally comparable for many designs. However, they differ in data rate, fail-safe receiver behavior, and ESD protection level, so the ADM4857AR should be validated against the specific bus timing, idle-state, and ruggedness requirements of the target application before substitution.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Receiver Fail-Safe
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 | ADM4857AR | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 10 Mbps | Maximum signaling speed; the ADM4857AR supports much faster communication, so it is not a drop-in substitute where high speed is required. |
| Duplex Mode | Half-duplex | Full-duplex | Determines whether simultaneous transmit and receive is possible; full-duplex parts require separate driver/receiver pairs and different bus wiring. |
| Number of Drivers/Receivers | 1 driver / 1 receiver | 1 driver / 1 receiver | Defines the transceiver channel count; both are single-channel devices, so channel count alone does not differentiate them. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the bus; both offer similar ESD ratings, so this is not a differentiator. |
| Supply Voltage | 5 V | 5 V | Operating supply rail; both require a 5 V supply, so power-supply design is compatible. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range; both cover the same range, so environmental compatibility is equivalent. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Footprint and assembly compatibility; identical package allows the same PCB land pattern. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Ensures a defined logic output when the bus is idle or open; both provide fail-safe behavior, aiding interoperability. |
| Low-Power Shutdown | Yes | Yes | Allows the device to enter a low-current state; both support shutdown, so power-management features are comparable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM483EARZ | ADM4857AR |
|---|---|---|
| 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 differences between the ADM483EARZ and ADM4857AR?
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, supplied in an 8-lead SOIC package. The ADM4857AR is a 5 V, high speed, half-duplex RS-485/RS-422 transceiver rated for data rates up to 10 Mbps, supplied in an 8-lead SOIC package. The key differences are data rate (250 kbps vs 10 Mbps), ESD protection level, and the associated slew-rate/supply-current characteristics.
Are the ADM483EARZ and ADM4857AR pin-compatible?
Both devices are offered in an 8-lead SOIC (R-8) package with the standard RS-485 half-duplex pinout (RO, RE, DE, DI, GND, A, B, VCC). Because they share the same package and pin functions, they are pin-compatible, but substitution still requires verification of data rate, ESD, and supply-current requirements against the target design.
What data rates do the ADM483EARZ and ADM4857AR support?
The ADM483EARZ supports data rates up to 250 kbps, making it suitable for low-speed, low-EMI buses. The ADM4857AR supports data rates up to 10 Mbps for higher-speed RS-485/RS-422 communication. The maximum cable length and bus loading should be evaluated against the selected data rate.
What ESD protection is specified for each device?
The ADM483EARZ is specified with ±15 kV ESD protection on the RS-485 bus pins (human body model) per the Analog Devices datasheet. The ADM4857AR datasheet specifies ESD protection on the bus pins as well; designers should confirm the exact ESD rating and test model from the ADM4857AR datasheet before relying on it for a given application.
What supply voltage and current do these transceivers require?
Both the ADM483EARZ and ADM4857AR operate from a single 5 V supply. The ADM483EARZ is characterized as a low-power device with quiescent supply current in the low hundreds of microamperes range, while the ADM4857AR draws higher supply current consistent with its 10 Mbps operation. Exact quiescent and operating currents should be taken from the respective manufacturer datasheets.
Can the ADM483EARZ be used as a drop-in replacement for the ADM4857AR in an existing 10 Mbps design?
No. The ADM483EARZ is limited to 250 kbps, so it cannot support a 10 Mbps bus. Replacing an ADM4857AR with an ADM483EARZ in a 10 Mbps design would violate the data-rate specification. The reverse substitution (ADM4857AR in place of ADM483EARZ) may be feasible only after confirming ESD, supply current, and EMI/slew-rate requirements are acceptable.
What are the operating temperature ranges for the ADM483EARZ and ADM4857AR?
Both devices are specified for the industrial temperature range of −40 °C to +85 °C, as stated in their respective Analog Devices datasheets. Designers should confirm the exact grade suffix and temperature range from the ordering guide of each datasheet.
Which device is better suited for long cable runs in noisy industrial environments?
The ADM483EARZ, with its 250 kbps maximum data rate and ±15 kV ESD protection, is generally better suited to long cable runs and noisy industrial environments where lower slew rates reduce EMI and reflections. The ADM4857AR is intended for shorter, higher-speed links up to 10 Mbps. Final selection should be based on cable length, data rate, and ESD requirements verified from the datasheets.