Part A
ADM1485JRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5495 PCS
- Package
- SOIC-8
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM1485JRZ and ADM1485AR are functionally compatible RS-485 transceivers sharing the same core interface, supply, and package family, making the ADM1485JRZ a viable replacement candidate for the ADM1485AR in most designs. The primary distinction lies in operating temperature range and package finish, so engineers should confirm the target application's thermal and assembly requirements before substituting.
Function and Interface Type
High match
Supply Voltage Range
High match
Package Type and Pinout
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 | ADM1485JRZ | ADM1485AR | Why it matters |
|---|---|---|---|
| Package / Mounting Type | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Both are SOIC-8 surface-mount, so the footprint is compatible for drop-in replacement. |
| Operating Temperature Range | 0°C to +70°C | -40°C to +85°C | The A-grade version supports industrial temperature ranges, while the J-grade is limited to commercial temperatures; this affects suitability for harsh environments. |
| Manufacturer Part Grade | J grade (commercial) | A grade (industrial) | Grade determines tested temperature limits and reliability screening, which impacts substitutability in industrial designs. |
| Data Rate | Up to 2.5 Mbps | Up to 2.5 Mbps | Identical data rate ensures the same communication throughput for RS-485 networks. |
| Duplex Mode | Half-duplex | Half-duplex | Both are half-duplex transceivers, so bus topology and driver/receiver enable logic remain compatible. |
| Supply Voltage | 5 V | 5 V | Same 5 V supply requirement means no power rail redesign is needed when substituting. |
| Number of Drivers / Receivers | 1 driver / 1 receiver | 1 driver / 1 receiver | Matching driver/receiver count preserves the network node configuration. |
| Mounting / Pin Count | 8 pins | 8 pins | Identical pin count and pinout allow direct board-level interchangeability. |
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 | ADM1485JRZ | ADM1485AR |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | 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 | 70 mV | - |
| Data Rate | 30Mbps | - |
| Operating Temperature | 0°C ~ 70°C | - |
Frequently asked questions
What are the key differences between the ADM1485JRZ and the ADM1485AR?
The ADM1485JRZ is supplied in an 8-lead SOIC package and is specified for operation over the commercial temperature range of 0°C to +70°C. The ADM1485AR is supplied in an 8-lead PDIP package and is specified over the industrial temperature range of −40°C to +85°C. Both are 5 V, low power, high speed RS-485/RS-422 transceivers with the same electrical function, but they differ in package type and rated temperature range.
Are the ADM1485JRZ and ADM1485AR electrically identical in function?
Yes. Both devices are single 5 V RS-485/RS-422 transceivers with one driver and one receiver, featuring a maximum data rate of 2.5 Mbps, driver short-circuit protection, and thermal shutdown. The functional block diagram and pin functions are the same; the differences are package and temperature grade.
Can the ADM1485JRZ be used as a drop-in replacement for the ADM1485AR?
Not as a direct drop-in replacement, because the ADM1485JRZ is an 8-lead SOIC (surface-mount) device while the ADM1485AR is an 8-lead PDIP (through-hole) device. The PCB footprint and assembly method differ. Electrical compatibility must also be confirmed against the target design's temperature requirements, since the JRZ is rated 0°C to +70°C and the AR is rated −40°C to +85°C.
What is the maximum data rate supported by the ADM1485JRZ and ADM1485AR?
Both devices support a maximum data rate of 2.5 Mbps, as specified in the Analog Devices ADM1485 datasheet.
What supply voltage do the ADM1485JRZ and ADM1485AR require?
Both devices operate from a single 5 V supply (nominally 5 V ±5%), consistent with the standard RS-485/RS-422 supply requirement specified in the Analog Devices ADM1485 datasheet.
Do the ADM1485JRZ and ADM1485AR include fail-safe receiver behavior?
The ADM1485 family is specified with a fail-safe receiver that ensures a known output state when the receiver inputs are open, shorted, or idle. This behavior is common to both the JRZ and AR variants per the Analog Devices ADM1485 datasheet.
Which temperature range applies to each variant?
The ADM1485JRZ is rated for the commercial temperature range of 0°C to +70°C. The ADM1485AR is rated for the industrial temperature range of −40°C to +85°C. Designs operating outside 0°C to +70°C should use the industrial-grade variant.
Are both devices RoHS compliant?
The ADM1485JRZ suffix "Z" denotes a lead-free, RoHS-compliant package per Analog Devices ordering conventions. RoHS status for the ADM1485AR should be confirmed against the specific manufacturer datasheet and ordering guide, as the non-Z suffix historically indicates a leaded (non-RoHS) package.