Part A
ADM483EARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6730 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM483EARZ and ADM4851AR are both half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages with 5 V supply operation, making them functionally interchangeable for many designs. However, the ADM483EARZ offers enhanced ESD protection and a higher data rate, while the ADM4851AR provides a lower quiescent supply current. Designers should validate slew-rate, ESD robustness, and supply-current budgets against the target application before final substitution.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
ESD Protection
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 | ADM483EARZ | ADM4851AR | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 500 kbps | Maximum signaling speed; determines whether the part meets the bus bandwidth requirements of the application. |
| Duplex Mode | Half-duplex | Half-duplex | Defines whether transmit and receive share the same pair; must match the network topology and cabling. |
| Number of Drivers / Receivers | 1 / 1 | 1 / 1 | Indicates the transceiver channel count; must align with the node configuration on the RS-485 bus. |
| Supply Voltage | 5 V | 5 V | Operating rail voltage; must match the system power supply for direct substitution. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the bus; affects field reliability and required external protection. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Environmental range over which the device is specified; must cover the application's ambient conditions. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Footprint and assembly compatibility; identical packages allow drop-in board replacement. |
| Fail-Safe Receiver | Yes | Yes | Guarantees a defined logic output when the bus is idle or open, preventing indeterminate states. |
| Driver Output / Receiver Input Compliance | RS-485 / RS-422 compatible | RS-485 / RS-422 compatible | Confirms electrical interoperability with the target bus standard for reliable multi-drop communication. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM483EARZ | ADM4851AR |
|---|---|---|
| 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 | 4.5V ~ 5.5V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 70 mV | - |
| Data Rate | 250kbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary differences between the ADM483EARZ and ADM4851AR?
The ADM483EARZ is a ±15 kV ESD-protected, slew-rate-limited RS-485/RS-422 transceiver in an 8-lead SOIC package, specified for 5 V operation. The ADM4851AR is a 3.3 V, ±15 kV ESD-protected, slew-rate-limited RS-485/RS-422 transceiver in an 8-lead SOIC package. The key differences are the supply voltage (5 V vs. 3.3 V) and the corresponding logic-level compatibility and output drive characteristics.
Are the ADM483EARZ and ADM4851AR pin-compatible?
Both devices are offered in an 8-lead SOIC package with the standard RS-485 transceiver pinout (RO, RE, DE, DI, GND, A, B, VCC). However, pin compatibility alone does not guarantee interchangeability because the supply voltage and logic thresholds differ. The ADM483EARZ operates from 5 V, while the ADM4851AR operates from 3.3 V, so the VCC pin requires a different supply rail.
Can the ADM483EARZ be replaced directly by the ADM4851AR in an existing 5 V design?
No. The ADM4851AR is specified for 3.3 V operation and is not rated for a 5 V supply. Replacing a 5 V ADM483EARZ with a 3.3 V ADM4851AR would require redesigning the supply rail and verifying logic-level compatibility with the connected UART or controller. Direct substitution without validation is not supported by the datasheets.
What data rate do the ADM483EARZ and ADM4851AR support?
Both devices are slew-rate-limited transceivers intended for reduced EMI. The ADM483EARZ is specified for data rates up to 250 kbps. The ADM4851AR is also a slew-rate-limited device; its datasheet specifies a maximum data rate in the low-hundreds-of-kbps range consistent with slew-rate-limited RS-485 operation. Designers should confirm the exact rated data rate from the respective manufacturer datasheet for the target operating conditions.
What ESD protection do the ADM483EARZ and ADM4851AR provide?
Both devices are specified with ±15 kV ESD protection on the RS-485 bus pins (A and B) using the human body model (HBM), per their respective manufacturer datasheets. This bus-pin ESD rating is a key selection criterion for industrial RS-485 interfaces exposed to handling and field transients.
How do the supply voltage and logic levels compare between the two parts?
The ADM483EARZ operates from a 5 V ±5% supply and its logic inputs/outputs are compatible with 5 V logic levels. The ADM4851AR operates from a 3.3 V supply and its logic interface is designed for 3.3 V logic levels. Mixing the two in a shared bus is possible at the RS-485 differential level, but the local logic interface of each node must match its own supply and controller levels.
Are both devices suitable for half-duplex RS-485 networks?
Yes. Both the ADM483EARZ and ADM4851AR are half-duplex RS-485/RS-422 transceivers with a single differential pair (A and B) and driver-enable (DE) and receiver-enable (RE) control pins. They are intended for multipoint bus applications where nodes share one twisted pair.
What package and temperature range do the ADM483EARZ and ADM4851AR offer?
Both parts are available in an 8-lead SOIC package. The ADM483EARZ is specified over the industrial temperature range of −40 °C to +85 °C. The ADM4851AR is likewise specified over the industrial temperature range of −40 °C to +85 °C. Designers should verify the exact orderable part number suffix against the manufacturer datasheet for the intended temperature grade.