Part A
ADM3485EAR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3150 PCS
- Package
- SOIC-8
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM3485EAR and ADM3488ARZN are both half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages with 3.3 V supply operation, making them strong functional candidates for substitution. However, the ADM3485EAR offers a higher maximum data rate and full ±15 kV ESD protection on the bus pins, while the ADM3488ARZN provides a lower data rate with reduced ESD rating. Designers should validate data-rate headroom and ESD robustness requirements before finalizing the replacement.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
ESD Protection
Validation required
Parts at a glance
Part B
ADM3488ARZN
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4406 PCS
- Package
- SOIC-8
- Series
- Interface - Drivers, Receivers, Transceivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM3485EAR | ADM3488ARZN | Why it matters |
|---|---|---|---|
| Data Rate | 10 Mbps | 250 kbps | Maximum signaling speed; the two parts are not speed-compatible, so a drop-in swap changes achievable bus throughput. |
| Duplex Mode | Half duplex | Full duplex | Determines whether transmit and receive can occur simultaneously and how many bus wires are required; a direct functional substitution is not possible. |
| Number of Drivers / Receivers | 1 / 1 | 1 / 1 | Confirms the transceiver channel count; both provide a single differential driver and receiver pair. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (12 kΩ) | 1 unit load (12 kΩ) | Sets how many nodes can share the RS-485 bus; both are standard 1-unit-load devices supporting up to 32 nodes. |
| Supply Voltage | 3.3 V | 3.3 V | Both operate from a 3.3 V rail, so power-supply compatibility is maintained. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Indicates the industrial temperature envelope in which the device is guaranteed to meet specifications. |
| Package / Mounting | 8-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Same footprint and mounting style allow board-level interchangeability without layout changes. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Ensures a defined logic output when the bus is idle or disconnected, preventing indeterminate receiver states. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Bus-pin ESD robustness affects field reliability and handling tolerance in harsh environments. |
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 | ADM3485EAR | ADM3488ARZN |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Full |
| Receiver Hysteresis | 50 mV | 50 mV |
| Data Rate | 10Mbps | 250kbps |
| Voltage - Supply | 3V ~ 3.6V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADM3485EAR and ADM3488ARZN?
The ADM3485EAR is a 3.3 V, half-duplex RS-485/RS-422 transceiver specified for data rates up to 12 Mbps, while the ADM3488ARZN is a 3.3 V, full-duplex RS-485/RS-422 transceiver specified for data rates up to 250 kbps. The ADM3485EAR is offered in an 8-lead SOIC package, whereas the ADM3488ARZN is offered in a 14-lead SOIC package to accommodate the full-duplex pinout.
Are the ADM3485EAR and ADM3488ARZN pin-to-pin compatible?
No. The ADM3485EAR uses an 8-lead SOIC package with a half-duplex pinout (including DE and /RE control pins), while the ADM3488ARZN uses a 14-lead SOIC package with a full-duplex pinout (separate A/B driver outputs and Y/Z receiver inputs). The different package sizes and pin functions prevent direct pin-to-pin substitution.
Can the ADM3485EAR and ADM3488ARZN be used interchangeably in an existing design?
Not without design changes. The ADM3485EAR is half-duplex and requires DE and /RE control for bus direction, while the ADM3488ARZN is full-duplex and uses independent driver and receiver pairs. The differing package footprints, pinouts, and duplex configurations mean a direct drop-in replacement is not possible.
What are the maximum data rates of the ADM3485EAR and ADM3488ARZN?
The ADM3485EAR is specified for data rates up to 12 Mbps. The ADM3488ARZN is specified for data rates up to 250 kbps. The data rate difference reflects the different target applications and slew-rate characteristics of each device.
Do both devices operate from a 3.3 V supply?
Yes. Both the ADM3485EAR and ADM3488ARZN are 3.3 V RS-485/RS-422 transceivers designed to operate from a single 3.3 V supply, making them suitable for low-power and mixed-supply systems.
What are the package options for the ADM3485EAR and ADM3488ARZN?
The ADM3485EAR is available in an 8-lead SOIC package. The ADM3488ARZN is available in a 14-lead SOIC package. The package difference is driven by the half-duplex versus full-duplex pin requirements of each device.
Which device should be selected for a full-duplex RS-485 application?
The ADM3488ARZN should be selected for full-duplex RS-485/RS-422 applications because it provides separate driver outputs and receiver inputs for simultaneous transmit and receive operation. The ADM3485EAR is a half-duplex device and is not suitable for full-duplex bus configurations.
Are the ADM3485EAR and ADM3488ARZN compliant with RS-485 and RS-422 standards?
Yes. Both devices are designed as RS-485/RS-422 transceivers and are intended to meet the electrical requirements of those standards. Designers should confirm specific compliance parameters against the respective manufacturer datasheets for their target application.