Part A
ADM485ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6497 PCS
- Package
- SOIC-8
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM485JRZ and ADM485ARZ are functionally interchangeable half-duplex RS-485 transceivers from the same manufacturer family, sharing identical pinout, supply voltage, data rate, and interface characteristics. The ADM485JRZ is specified over the commercial temperature range, while the ADM485ARZ is specified over the industrial temperature range, making the ARZ variant the more robust choice for extended-temperature applications. Both parts can serve as drop-in replacements for one another in commercial environments, with the ARZ offering broader thermal headroom.
Interface Protocol
High match
Pinout and Package
High match
Supply Voltage
High match
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 | ADM485JRZ | ADM485ARZ | Why it matters |
|---|---|---|---|
| Data Rate | 5 Mbps | 5 Mbps | Determines the maximum signaling speed the transceiver can support on the RS-485 bus; identical here so both suit the same bus speed requirements. |
| Duplex Mode | Half-duplex | Half-duplex | Defines whether transmit and receive share the same differential pair; both are half-duplex, so they are interchangeable in two-wire bus topologies. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Indicates one driver and one receiver per package; matching counts means identical bus node capability and pin function. |
| Supply Voltage | 5 V | 5 V | Both require a single 5 V supply, so power rail design and level compatibility remain unchanged when substituting. |
| Operating Temperature Range | 0°C to +70°C | -40°C to +85°C | The A-grade part supports the industrial temperature range while the J-grade is commercial only; this affects suitability for harsh or outdoor environments. |
| 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 | Determines how many nodes can share the bus (up to 32 for 1-unit-load devices); equal here so node-count limits are the same. |
| 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; both provide this, preserving deterministic behavior on the network. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Bus-pin ESD robustness affects field reliability; matching ratings mean equivalent protection against handling and transient events. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485ARZ | ADM485JRZ |
|---|---|---|
| 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 | 70 mV |
| Data Rate | 5Mbps | 5Mbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM485JRZ and ADM485ARZ?
Both devices are 5 V, low-power, half-duplex RS-485/RS-422 transceivers from Analog Devices in an 8-lead SOIC package. The primary difference is the operating temperature range: the ADM485JRZ is specified for 0°C to +70°C (commercial grade), while the ADM485ARZ is specified for −40°C to +85°C (industrial grade).
Are the ADM485JRZ and ADM485ARZ pin-compatible?
Yes. Both parts are offered in the same 8-lead SOIC (R-8) package with identical pin assignments: RO, RE, DE, DI, GND, A, B, and VCC. They share the same footprint and can use the same PCB land pattern.
Do the ADM485JRZ and ADM485ARZ have the same data rate and driver/receiver specifications?
Yes. Both are specified for a maximum data rate of 5 Mbps and include one differential driver and one differential receiver. Both feature slew-rate-limited outputs for reduced EMI and are designed for half-duplex RS-485/RS-422 communication.
Can the ADM485ARZ be used as a drop-in replacement for the ADM485JRZ?
Electrically and mechanically they are interchangeable, and the ADM485ARZ covers the full 0°C to +70°C range of the ADM485JRZ while extending to −40°C to +85°C. However, substitution should be validated against the specific design's thermal, supply, and bus-loading requirements using the respective manufacturer datasheets.
What supply voltage and quiescent current do the ADM485JRZ and ADM485ARZ require?
Both devices operate from a single 5 V ±5% supply. They are low-power transceivers with typical quiescent supply current in the hundreds of microamperes range; refer to the Analog Devices datasheet for the exact specified maximum and typical values at the relevant temperature grade.
Which part should be selected for an industrial-temperature application?
The ADM485ARZ should be selected for industrial environments because it is specified over −40°C to +85°C. The ADM485JRZ is limited to the commercial range of 0°C to +70°C and is not specified for operation outside that range.
Are the ADM485JRZ and ADM485ARZ RoHS compliant?
Yes. The "Z" suffix in both part numbers denotes a lead-free, RoHS-compliant package per Analog Devices' ordering nomenclature. Designers should confirm compliance status on the current manufacturer datasheet or product page for the specific lot.