Part A
ADM4850ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7538 ПКС
- Package
- SOP-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM4850ARZ and ADM483EAR 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 most designs. The ADM483EAR offers a higher maximum data rate and a wider operating temperature range, while the ADM4850ARZ provides lower quiescent supply current. The primary design consideration is the difference in data rate capability and the resulting slew-rate characteristics, which should be validated against the target bus timing and EMI requirements before substitution.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Operating Temperature Range
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 | ADM483EAR | 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 the transceiver can transmit and receive simultaneously; 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 must match the system rail; both require a 5 V supply. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Defines environmental limits for reliable operation; identical ranges suit the same industrial environments. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Footprint and assembly compatibility; matching packages allow drop-in board replacement. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the bus; equal ratings give equivalent field reliability. |
| Fail-Safe Receiver | Yes (open-circuit) | Yes (open-circuit) | Ensures a defined logic output when the bus is idle or disconnected; both provide fail-safe behavior. |
| Driver Output / Receiver Input Common-Mode Range | -7 V to +12 V | -7 V to +12 V | Determines tolerance to ground potential differences across the bus; identical ranges ensure the same network compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4850ARZ | ADM483EAR |
|---|---|---|
| Series | - | ADL5903 |
| Brand | - | Analog Devices |
| Product Type | - | RF Detector |
| Subcategory | - | Wireless & RF Integrated Circuits |
| Type | Transceiver | Power Detector |
| Technology | - | Si |
| Packaging | - | Reel |
| Factory Pack Quantity | - | 3000 |
| Part Status | Active | - |
| Protocol | RS422, RS485 | - |
| Number of Drivers/Receivers | 1/1 | - |
| Duplex | Half | - |
| Receiver Hysteresis | 20 mV | - |
| Data Rate | 250kbps | - |
| Voltage - Supply | 4.75V ~ 5.25V | - |
| Operating Temperature | -40°C ~ 85°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary differences between the ADM4850ARZ and ADM483EAR?
The ADM4850ARZ is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 20 Mbps, while the ADM483EAR is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 250 kbps. The ADM483EAR includes enhanced ESD protection (±15 kV IEC 61000-4-2 contact discharge on the bus pins) and is optimized for low-speed, robust industrial networks, whereas the ADM4850ARZ targets higher-speed communication with standard ESD protection.
Are the ADM4850ARZ and ADM483EAR pin-compatible?
Both devices are offered in an 8-lead SOIC package (R suffix) with the same standard RS-485 transceiver pinout: RO, RE, DE, DI, GND, A, B, and VCC. This allows them to share the same PCB footprint, but pin compatibility does not guarantee functional interchangeability without validating data rate, ESD, and fail-safe requirements.
Can the ADM4850ARZ and ADM483EAR be used interchangeably in an existing design?
Not without design review. The ADM4850ARZ supports up to 20 Mbps, so it can generally operate in a 250 kbps network, but the ADM483EAR cannot replace the ADM4850ARZ in a 20 Mbps link because its maximum data rate is 250 kbps. Additionally, the ADM483EAR provides higher bus-pin ESD protection, so substituting the ADM4850ARZ may reduce system-level ESD robustness.
What are the maximum data rates of the ADM4850ARZ and ADM483EAR?
The ADM4850ARZ is specified for a maximum data rate of 20 Mbps. The ADM483EAR is specified for a maximum data rate of 250 kbps. These ratings are defined by the manufacturer's datasheets and determine the maximum signaling rate supported over the bus.
How do the ESD protection ratings of the ADM4850ARZ and ADM483EAR compare?
The ADM483EAR features enhanced ESD protection on the RS-485 bus pins, rated to ±15 kV using the IEC 61000-4-2 contact discharge method, in addition to standard human body model (HBM) protection. The ADM4850ARZ provides standard ESD protection per the manufacturer datasheet but does not carry the same ±15 kV IEC 61000-4-2 bus-pin rating. Designs exposed to high ESD stress should account for this difference.
Do both devices support half-duplex RS-485 and RS-422 operation?
Yes. Both the ADM4850ARZ and ADM483EAR are half-duplex transceivers compliant with RS-485 and RS-422 signaling, featuring a differential driver and receiver with dedicated driver enable (DE) and receiver enable (RE) pins for bus arbitration.
What supply voltage and package options apply to the ADM4850ARZ and ADM483EAR?
Both devices operate from a single 5 V supply and are available in an 8-lead SOIC package (indicated by the R suffix in the ordering code). Designers should confirm the exact orderable part number and package variant against the manufacturer datasheet before finalizing the BOM.