Part A
ADM4852ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4726 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM4852ARZ and ADM4850AR are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with identical pinout and 5 V supply operation, making them strong functional replacement candidates. The ADM4852ARZ offers a higher maximum data rate (2.5 Mbps versus 500 kbps) and a wider receiver common-mode range, while the ADM4850AR provides lower quiescent supply current. Designers should validate the data-rate margin and receiver common-mode requirements against the target bus before substituting.
Package Type
High match
Pin Configuration
High match
Data Rate
Validation required
Receiver Common-Mode 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 | ADM4852ARZ | ADM4850AR | Why it matters |
|---|---|---|---|
| Data Rate | 2.5 Mbps | 250 kbps | Determines the maximum communication speed the transceiver can support; a faster part may be required for high-throughput buses, while a slower part may be sufficient for legacy low-speed networks. |
| Duplex Mode | Half-duplex | Half-duplex | Defines whether the device can transmit and receive simultaneously; both are half-duplex, so they are functionally interchangeable in two-wire bus topologies. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Indicates the transceiver channel count; identical 1 driver/1 receiver configuration means both fit the same point-to-point or multi-drop node role. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V rail, so no power-supply redesign is needed when substituting one for the other. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts are rated for industrial temperature environments, ensuring reliable operation across the same application conditions. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (32 nodes) | 1 unit load (32 nodes) | Determines how many transceivers can share a single RS-485 bus; both support up to 32 nodes, so bus sizing remains unchanged. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Ensures a defined logic output when the bus is idle or open, preventing spurious data; both provide this protection so behavior is consistent. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Bus-pin ESD robustness affects field reliability in harsh environments; matching ratings mean equivalent protection when swapping parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4852ARZ | 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 | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 20 mV | - |
| Data Rate | 2.5Mbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the ADM4852ARZ and ADM4850AR?
The ADM4852ARZ is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 2.5 Mbps, while the ADM4850AR is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 250 kbps. Both are 5 V single-supply devices in 8-lead SOIC packages, but they differ in maximum data rate, slew-rate limiting, and quiescent supply current.
Are the ADM4852ARZ and ADM4850AR 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 allows a common PCB footprint, but electrical differences must still be validated before substitution.
What is the maximum data rate of each device?
The ADM4852ARZ supports data rates up to 2.5 Mbps. The ADM4850AR supports data rates up to 250 kbps and is slew-rate limited to reduce EMI and reflections on long cables.
Do both parts operate from a single 5 V supply?
Yes. Both the ADM4852ARZ and ADM4850AR operate from a single 5 V ±5% supply (4.75 V to 5.25 V) and are specified over the industrial temperature range of −40°C to +85°C.
How do the quiescent supply currents compare?
The ADM4850AR is a low-power, slew-rate-limited device with a typical quiescent supply current of 300 µA. The ADM4852ARZ, being a higher-speed device, has a higher typical quiescent supply current. Designers should confirm exact supply-current limits in the respective Analog Devices datasheets for the target operating conditions.
Can the ADM4850AR be used as a drop-in replacement for the ADM4852ARZ?
Not unconditionally. Although the pinout and package match, the ADM4850AR is limited to 250 kbps and is slew-rate limited, so it cannot replace the ADM4852ARZ in applications requiring up to 2.5 Mbps. Substitution is only valid when the system data rate is within 250 kbps and the slew-rate-limited behavior is acceptable.
Which device is better suited for long cable runs or noisy environments?
The ADM4850AR is generally preferred for long cable runs and EMI-sensitive environments because its slew-rate-limited driver reduces high-frequency emissions and cable reflections. The ADM4852ARZ is intended for higher-speed links where the 2.5 Mbps data rate is required.
Do both devices include fail-safe receiver inputs?
Both the ADM4852ARZ and ADM4850AR incorporate a fail-safe receiver feature that ensures a known logic-high receiver output when the bus inputs are open or floating, helping to prevent indeterminate states on an idle bus. Designers should confirm the exact fail-safe conditions in the Analog Devices datasheets.