Part A
ADM4850ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 7538 件
- Package
- SOP-8
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The ADM4850ARZ and ADM485JR are both half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages with matching pinouts and 5 V supply operation, making the ADM4850ARZ a viable functional replacement candidate for the ADM485JR. Designers should validate the higher data rate, reduced quiescent current, and enhanced ESD robustness against the specific application requirements before final qualification.
Function and Protocol
High match
Package and Pinout
High match
Data Rate
Validation required
Supply Current
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 | ADM4850ARZ | ADM485JR | Why it matters |
|---|---|---|---|
| Data Rate | 500 kbps | 5 Mbps | Maximum signaling speed; the JR variant supports 10x higher throughput, which may be required for faster bus protocols. |
| Duplex Mode | Half-duplex | Half-duplex | Determines whether transmit and receive share the same pair; both are half-duplex so bus topology compatibility is preserved. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Confirms a single differential driver and receiver per package, matching point-to-point or multi-drop RS-485 node requirements. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V rail, so power supply design and logic-level interfacing remain unchanged. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The ARZ industrial grade covers a wider temperature span, which is critical for reliable operation in harsh environments. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Identical package and footprint allow direct board-level drop-in replacement without layout changes. |
| Fail-Safe Receiver | Yes (open/short circuit) | Yes (open/short circuit) | Guarantees a defined logic output when the bus is idle or faulted, preventing spurious data on the network. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Both offer robust ESD tolerance on the RS-485 bus pins, reducing field failures from transient events. |
| Driver Output / Receiver Input Common-Mode Range | -7 V to +12 V | -7 V to +12 V | Standard RS-485 common-mode range ensures interoperability across multi-vendor bus segments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4850ARZ | ADM485JR |
|---|---|---|
| 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 | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 20 mV | - |
| Data Rate | 250kbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the ADM4850ARZ and the ADM485JR?
The ADM4850ARZ is a 5 V, low-power, half-duplex RS-485/RS-422 transceiver in an 8-lead SOIC package with a data rate of 20 Mbps, while the ADM485JR is a 5 V, half-duplex RS-485/RS-422 transceiver in an 8-lead SOIC package with a data rate of 5 Mbps. The ADM4850ARZ is specified for a wider operating temperature range of −40°C to +85°C, whereas the ADM485JR is specified for 0°C to +70°C.
Are the ADM4850ARZ and ADM485JR pin-compatible?
Yes. Both devices are offered in an 8-lead SOIC package with the same pinout: RO, RE, DE, DI, GND, A, B, and VCC. This allows them to share the same PCB land pattern, but electrical and performance differences must still be validated before substitution.
Can the ADM4850ARZ be used as a drop-in replacement for the ADM485JR?
Pin compatibility exists, but a direct drop-in replacement requires validation. The ADM4850ARZ supports a higher data rate of 20 Mbps versus 5 Mbps for the ADM485JR and has a wider temperature range of −40°C to +85°C versus 0°C to +70°C. The designer must confirm that the higher slew rate, supply current, and receiver input characteristics meet the target design requirements.
What data rates do the ADM4850ARZ and ADM485JR support?
The ADM4850ARZ supports data rates up to 20 Mbps. The ADM485JR supports data rates up to 5 Mbps. The maximum data rate is limited by the driver slew rate and the cable length; longer cables require lower data rates for reliable communication.
What are the operating temperature ranges for these two transceivers?
The ADM4850ARZ is specified over the industrial temperature range of −40°C to +85°C. The ADM485JR is specified over the commercial temperature range of 0°C to +70°C. For industrial or outdoor applications, the ADM4850ARZ is the appropriate choice.
Do both devices operate from a single 5 V supply?
Yes. Both the ADM4850ARZ and the ADM485JR are designed for a single 5 V supply and are specified for operation over the 4.75 V to 5.25 V supply range, which is the standard 5 V ±5% tolerance.
How do the receiver input characteristics compare between the ADM4850ARZ and ADM485JR?
Both devices feature a differential receiver with a wide common-mode input range of −7 V to +12 V, compliant with the RS-485 standard. The ADM4850ARZ is a low-power device with a quiescent supply current typically in the sub-milliampere range, while the ADM485JR has a higher quiescent supply current. Exact current values should be confirmed from the respective manufacturer datasheets.
Which device is better suited for high-speed or long-cable RS-485 networks?
The ADM4850ARZ is better suited for higher-speed networks because it supports up to 20 Mbps, whereas the ADM485JR is limited to 5 Mbps. For long cable runs, both devices require proper termination and biasing, and the achievable data rate decreases with cable length regardless of the transceiver selected.