Part A
ADM4850ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7538 PCS
- Package
- SOP-8
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Compatible functional replacement candidate
The ADM4850ARZ and ADM487EWARZ are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with a 5 V supply and a pinout that supports functional substitution in many designs. However, the ADM487EWARZ offers a wider operating temperature range and enhanced ESD protection, while the ADM4850ARZ provides a higher maximum data rate. Designers should validate data-rate requirements, ESD robustness targets, and thermal margins before adopting one part in place of the other.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADM487EWARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4892 PCS
- Package
- SOIC-8
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
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 | ADM487EWARZ | Why it matters |
|---|---|---|---|
| Data Rate | 500 kbps | 250 kbps | Maximum signaling speed; a faster device may be substituted only if the bus timing and cable length support it, but a slower device cannot meet higher-speed requirements. |
| Duplex Mode | Half-duplex | Full-duplex | Half-duplex uses a single shared pair while full-duplex uses separate transmit and receive pairs; these are not functionally interchangeable in a given network topology. |
| Number of Drivers / Receivers | 1 driver, 1 receiver | 1 driver, 1 receiver | Confirms the transceiver channel count; both provide a single bidirectional channel, which is relevant when matching to bus architecture. |
| Operating Supply Voltage | 5 V | 5 V | Both require a 5 V supply, so power-rail compatibility is maintained between the two parts. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (standard) | 1 unit load (standard) | Determines how many nodes can share the bus; matching unit-load ratings ensures the same maximum node count per bus segment. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Fail-safe receivers define a known output state when the bus is idle or open, preventing indeterminate logic levels in the network. |
| ESD Protection (Bus Pins) | ±15 kV (HBM, bus pins) | ±15 kV (HBM, bus pins) | Bus-pin ESD robustness affects field reliability and transient immunity; equivalent ratings indicate comparable ruggedness. |
| Package | 8-lead SOIC (R-8) | 16-lead SOIC (RW-16) | Footprint and pin count differ, so the parts are not drop-in board replacements even if electrical function is similar. |
| 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. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4850ARZ | ADM487EWARZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Series | - | Automotive |
| Part Status | Active | Active |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Half |
| Receiver Hysteresis | 20 mV | 70 mV |
| Data Rate | 250kbps | 250kbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADM4850ARZ and the ADM487EWARZ?
The ADM4850ARZ is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 115.2 kbps with slew-rate-limited outputs, housed in an 8-lead SOIC package and rated for the 0°C to +70°C commercial temperature range. The ADM487EWARZ is a half-duplex RS-485/RS-422 transceiver rated for data rates up to 250 kbps, supplied in an 8-lead SOIC package and specified over the −40°C to +85°C extended industrial temperature range. The ADM487EWARZ also integrates enhanced ESD protection on the bus pins, whereas the ADM4850ARZ provides standard ESD protection.
Are the ADM4850ARZ and ADM487EWARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout: RO, /RE, DE, DI, GND, A, B, and VCC. This common pinout allows a board designed for one part to accept the other, provided the electrical and temperature specifications are validated for the application.
What data rates do the ADM4850ARZ and ADM487EWARZ support?
The ADM4850ARZ supports data rates up to 115.2 kbps and features slew-rate-limited driver outputs to reduce EMI and reflections. The ADM487EWARZ supports data rates up to 250 kbps. The maximum achievable rate in a given system also depends on bus length, cable characteristics, and termination.
What are the operating temperature ranges for these two transceivers?
The ADM4850ARZ is specified over the commercial temperature range of 0°C to +70°C. The ADM487EWARZ is specified over the extended industrial temperature range of −40°C to +85°C, making it suitable for harsher environments.
How do the ESD protection levels differ between the ADM4850ARZ and ADM487EWARZ?
The ADM487EWARZ includes enhanced ESD protection on the RS-485 bus pins (A and B), specified to withstand ±15 kV human body model (HBM) contact discharges, which exceeds the standard ESD rating of the ADM4850ARZ. Designs exposed to frequent bus transients should account for this difference.
Can the ADM4850ARZ and ADM487EWARZ be used interchangeably in an existing design?
Because they share the same package and pinout, they can often be interchanged, but the designer must verify that the data rate, temperature range, and ESD requirements of the target application are met by the selected part. The ADM487EWARZ offers a higher data rate and wider temperature range, while the ADM4850ARZ provides slew-rate-limited outputs for lower EMI.
What supply voltage do the ADM4850ARZ and ADM487EWARZ require?
Both devices operate from a single +5 V supply (nominally 5 V ±5%). They are not 3.3 V parts, so the supply rail and logic interface levels must be compatible with 5 V operation.
Do both parts support half-duplex RS-485 and RS-422 communication?
Yes. Both the ADM4850ARZ and ADM487EWARZ are half-duplex transceivers suitable for RS-485 and RS-422 networks, with a differential driver and receiver sharing the A and B bus pins. Full-duplex operation would require a different device with separate driver and receiver bus pairs.