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 ADM483JR are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with a 5 V supply and pin-compatible footprint, making the ADM483JR a viable functional replacement candidate for the ADM4850ARZ in many designs. However, the two devices differ in data rate, fail-safe receiver behavior, and ESD/transient protection, so the replacement should be validated against the specific bus signaling, termination, and surge requirements of the target application before adoption.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Fail-Safe Receiver
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 | ADM483JR | Why it matters |
|---|---|---|---|
| Data Rate | 500 kbps | 250 kbps | Maximum signaling speed; determines whether the part meets the bus bandwidth requirements of the application. |
| Duplex Mode | Half-duplex | Half-duplex | Defines whether the transceiver can transmit and receive simultaneously; both are half-duplex so they are functionally aligned here. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Indicates the transceiver channel count; matching counts support direct functional substitution on a bus node. |
| Supply Voltage | 5 V | 5 V | Operating supply rail; both require a 5 V supply, so the power architecture of the design is compatible. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | Determines the environments in which the part can be reliably used; the wider industrial range of one part affects suitability for harsh conditions. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Footprint and assembly compatibility; identical package types allow drop-in replacement on the PCB. |
| Fail-Safe Receiver | Yes (open-circuit, short-circuit, idle-bus) | Yes (open-circuit, short-circuit, idle-bus) | Ensures a defined logic output when the bus is idle or faulted, preventing spurious data in multi-node networks. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the bus; matching ratings indicate comparable field reliability. |
| Driver Output / Receiver Input Common-Mode Range | -7 V to +12 V | -7 V to +12 V | Defines the allowable common-mode voltage on the bus; matching ranges ensure interoperability on the same RS-485 network. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4850ARZ | ADM483JR |
|---|---|---|
| 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 primary differences between the ADM4850ARZ and ADM483JR?
The ADM4850ARZ is a 5 V, half-duplex RS-485/RS-422 transceiver in an 8-lead SOIC package featuring ±15 kV ESD protection (HBM) and a 20 Mbps maximum data rate. The ADM483JR is a 5 V, half-duplex RS-485/RS-422 transceiver in an 8-lead SOIC package with a 250 kbps maximum data rate and ±8 kV ESD protection (contact discharge, IEC 61000-4-2). The ADM4850ARZ targets higher-speed buses, while the ADM483JR targets lower-speed, longer-cable applications.
Are the ADM4850ARZ and ADM483JR pin-compatible?
Yes. Both devices are offered in an 8-lead SOIC package with the standard half-duplex RS-485 pinout (RO, RE, DE, DI, GND, A, B, VCC), so they share the same footprint and pin functions. Electrical differences must still be validated before substitution.
What are the maximum data rates of the ADM4850ARZ and ADM483JR?
The ADM4850ARZ supports data rates up to 20 Mbps. The ADM483JR supports data rates up to 250 kbps. The lower slew rate of the ADM483JR reduces EMI and improves performance over long cables, while the ADM4850ARZ is intended for higher-speed networks.
How do the ESD protection ratings compare between the ADM4850ARZ and ADM483JR?
The ADM4850ARZ provides ±15 kV ESD protection on the RS-485 bus pins per the human body model (HBM). The ADM483JR provides ±8 kV contact discharge and ±15 kV air discharge protection per IEC 61000-4-2 on the bus pins. Both exceed standard HBM requirements, but the ADM483JR specifies IEC 61000-4-2 system-level ratings.
What are the supply voltage and operating temperature ranges for these devices?
Both the ADM4850ARZ and ADM483JR operate from a single 5 V supply (4.75 V to 5.25 V typical). The ADM4850ARZ is specified over the industrial temperature range of −40°C to +85°C. The ADM483JR is specified over the commercial temperature range of 0°C to +70°C (J grade).
Can the ADM4850ARZ and ADM483JR be used interchangeably in an existing RS-485 design?
They are pin-compatible, but interchangeability depends on the application. The ADM4850ARZ supports 20 Mbps and is suitable for high-speed buses, while the ADM483JR is limited to 250 kbps. A design requiring 20 Mbps cannot use the ADM483JR. Conversely, the ADM4850ARZ can generally operate at 250 kbps, but its higher slew rate may increase EMI on long cables. Verify timing, termination, and ESD requirements against the datasheets before substitution.
What are the receiver input sensitivity and common-mode range specifications?
Both devices feature a receiver input sensitivity of ±200 mV and a common-mode input voltage range of −7 V to +12 V, compliant with the TIA/EIA-485-A standard. These parameters are common to both the ADM4850ARZ and ADM483JR.
How do the driver output levels and bus loading compare?
Both the ADM4850ARZ and ADM483JR are specified as full-duplex-capable half-duplex transceivers supporting up to 32 unit loads on the bus. Driver differential output voltage is specified at 1.5 V minimum into a 54 Ω load for both devices, meeting RS-485 requirements. The ADM483JR is a standard 32-unit-load device, and the ADM4850ARZ is likewise rated for 32 unit loads.