Part A
ADM483EARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6730 PCS
- Package
- SOIC-8
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM483EARZ and ADM4850AR are both half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages with 5 V supply and similar data rates, making them a viable functional replacement pairing for many designs. However, the ADM483EARZ provides enhanced ESD protection and a wider common-mode range, while the ADM4850AR offers a lower quiescent supply current. Designers should validate ESD robustness, common-mode performance, and power budget against the target application before substituting one for the other.
Package Type
High match
Data Rate
High match
ESD Protection
Validation required
Supply Current
Validation required
Parts at a glance
Part B
ADM4850AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9264 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 | ADM483EARZ | ADM4850AR | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 250 kbps | Maximum signaling speed; both support the same rate, so timing compatibility is preserved. |
| Duplex Mode | Half-duplex | Half-duplex | Determines whether transmit and receive share the same bus lines; both are half-duplex, so bus topology is interchangeable. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Defines the transceiver channel count; identical configuration allows direct functional substitution. |
| Supply Voltage | 5 V | 5 V | Operating supply rail must match the system power design; both use a 5 V single supply. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the RS-485 bus; equal ratings mean similar field reliability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for the device; matching ranges ensure equivalent application coverage. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Footprint and assembly compatibility; identical package allows drop-in PCB replacement. |
| Fail-Safe Receiver | Yes (open/short circuit) | Yes (open/short circuit) | Ensures a defined logic output when the bus is idle or faulted; both provide fail-safe behavior for reliable communication. |
| Driver Output Voltage (Loaded) | ±1.5 V min (54 Ω load) | ±1.5 V min (54 Ω load) | Guarantees RS-485 differential drive level into a standard load; equal minimums ensure bus signal integrity. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM483EARZ | ADM4850AR |
|---|---|---|
| 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 ADM4850AR?
The ADM483EARZ is a ±15 kV ESD protected, slew-rate-limited RS-485/RS-422 transceiver specified for 5 V operation, while the ADM4850AR is a 3.3 V, ±15 kV ESD protected, slew-rate-limited RS-485/RS-422 transceiver. The key differences are the supply voltage (5 V vs. 3.3 V), package type (8-lead SOIC_N for the ADM483EARZ vs. 8-lead SOIC_N for the ADM4850AR), and the associated logic-level compatibility and power consumption characteristics.
Are the ADM483EARZ and ADM4850AR pin-compatible?
Both devices are offered in an 8-lead SOIC_N package with the same pinout (RO, RE, DE, DI, GND, A, B, VCC). However, pin compatibility alone does not guarantee interchangeability because the ADM483EARZ operates from a 5 V supply and the ADM4850AR operates from a 3.3 V supply; the supply voltage and logic thresholds must be verified against the target design before substitution.
What data rate does each device support?
Both the ADM483EARZ and ADM4850AR are slew-rate-limited transceivers specified for a maximum data rate of 250 kbps, which reduces EMI and reflections on improperly terminated buses. Designs requiring higher throughput should not substitute these parts without verifying the required data rate against the datasheet.
What is the ESD protection rating of these transceivers?
Both the ADM483EARZ and ADM4850AR are specified with ±15 kV ESD protection on the RS-485/RS-422 bus pins (A and B), using the human body model (HBM). This protection applies to the bus interface pins and should not be assumed for other pins or for system-level surge events beyond the datasheet conditions.
How do the supply voltage requirements compare?
The ADM483EARZ is specified for a 5 V ±5% supply (4.75 V to 5.25 V), while the ADM4850AR is specified for a 3.3 V ±5% supply (3.0 V to 3.6 V). The supply voltage difference affects logic input thresholds, driver output swing, and compatibility with the host controller's I/O levels, so each part must be matched to the system rail.
Can the ADM4850AR directly replace the ADM483EARZ in an existing 5 V design?
No. The ADM4850AR is a 3.3 V device and is not specified for 5 V operation; applying 5 V to its supply pin exceeds its absolute maximum ratings. A replacement requires verifying the supply rail, logic-level compatibility, and bus parameters against the ADM4850AR datasheet before any substitution is attempted.
What receiver input impedance and bus loading do these parts present?
Both the ADM483EARZ and ADM4850AR are specified as 1/8-unit-load (1/8 UL) receivers, allowing up to 256 transceivers to share a single RS-485 bus. This reduced bus loading is a shared characteristic of both devices and supports large multi-node networks within the datasheet's specified conditions.
What are the operating temperature ranges for these devices?
The ADM483EARZ is specified over the industrial temperature range of −40°C to +85°C. The ADM4850AR is also specified over the industrial temperature range of −40°C to +85°C. Both parts are therefore suitable for industrial RS-485/RS-422 applications within that range, subject to the other datasheet limits.