Part A
ADM485JRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5246 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM4852ARZ and ADM485JRZ are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with matching pinout and supply voltage, making them functionally interchangeable in most designs. The ADM4852ARZ offers a higher maximum data rate and a wider operating temperature range, while the ADM485JRZ provides a lower unit cost. Designers should verify data-rate requirements and thermal margins before substituting, but the two parts are strong drop-in candidates for standard RS-485 interface applications.
Package Type
High match
Pin Configuration
High match
Data Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADM4852ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4726 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
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 | ADM485JRZ | Why it matters |
|---|---|---|---|
| Data Rate | 2.5 Mbps | 5 Mbps | Maximum signaling speed; the JRZ supports twice the data rate, which may be required for higher-throughput buses. |
| 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 each device provides one differential driver and one receiver, matching typical RS-485 node requirements. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V rail, so power supply design does not need to change when substituting. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The ARZ version supports industrial temperature extremes, while the JRZ is limited to commercial ranges, affecting harsh-environment use. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Identical package and footprint allow direct board-level drop-in replacement without layout changes. |
| Receiver Input Impedance (Unit Loads) | 1 unit load | 1 unit load | Defines how many nodes can share the bus; both being 1 unit load supports up to 32 standard nodes. |
| 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 during disconnects. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Higher ESD tolerance improves robustness in field wiring; both share the same rating so protection level is unchanged. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485JRZ | ADM4852ARZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Half |
| Receiver Hysteresis | 70 mV | 20 mV |
| Data Rate | 5Mbps | 2.5Mbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM4852ARZ and ADM485JRZ?
The ADM4852ARZ is a half-duplex RS-485/RS-422 transceiver specified for data rates up to 2.5 Mbps, while the ADM485JRZ is specified for data rates up to 5 Mbps. Both are 5 V single-supply devices in 8-lead SOIC packages, but they differ in data rate, slew-rate limiting, and specified operating temperature range. The ADM4852ARZ is rated for the industrial temperature range of −40°C to +85°C, whereas the ADM485JRZ is rated for 0°C to +70°C.
Are the ADM4852ARZ and ADM485JRZ 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 them to share a common PCB footprint, but electrical differences must still be validated before substitution.
Can the ADM4852ARZ directly replace the ADM485JRZ in an existing design?
Not unconditionally. Although the pinout and package match, the ADM4852ARZ is limited to 2.5 Mbps versus 5 Mbps for the ADM485JRZ, and its specified temperature range differs (−40°C to +85°C versus 0°C to +70°C). A replacement is acceptable only if the system data rate is within 2.5 Mbps and the operating temperature range is covered by the ADM4852ARZ specification.
What data rate does each device support?
The ADM4852ARZ supports data rates up to 2.5 Mbps. The ADM485JRZ supports data rates up to 5 Mbps. Designs requiring 5 Mbps operation must use the ADM485JRZ or another device rated for that rate.
What are the operating temperature ranges of these two transceivers?
The ADM4852ARZ is specified over the industrial temperature range of −40°C to +85°C. The ADM485JRZ is specified over the commercial temperature range of 0°C to +70°C. The ADM4852ARZ therefore offers wider thermal headroom for industrial applications.
Do both devices operate from a single 5 V supply?
Yes. Both the ADM4852ARZ and ADM485JRZ are 5 V single-supply RS-485/RS-422 transceivers, which simplifies power architecture and allows them to share the same supply rail in a common design.
Are the ADM4852ARZ and ADM485JRZ slew-rate limited?
The ADM4852ARZ is a slew-rate limited version intended for reduced EMI and lower data rates up to 2.5 Mbps. The ADM485JRZ is specified for higher-speed operation up to 5 Mbps. Designers should confirm the exact slew-rate and EMI characteristics against the respective manufacturer datasheets for their application.
Which device should be selected for an industrial RS-485 network?
For industrial environments requiring operation below 0°C or above +70°C, the ADM4852ARZ is the appropriate choice because of its −40°C to +85°C rating, provided the network data rate does not exceed 2.5 Mbps. If the application requires 5 Mbps and operates within 0°C to +70°C, the ADM485JRZ is suitable.