Part A
ADM1485JRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5495 Stückzahl
- Package
- SOIC-8
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The ADM1490EBRZ is a functional replacement candidate for the ADM1485JRZ, sharing the same RS-485 transceiver function, 8-pin SOIC package, and 5 V supply rail, but it is not a pin-for-pin drop-in substitute. Designers must validate the differing data rate, duplex configuration, and receiver input impedance against the target application before substitution.
Data Rate
Validation required
Duplex Configuration
Not compatible
Package Type
High match
Receiver Input Impedance
Validation required
Parts at a glance
Part B
ADM1490EBRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4522 Stückzahl
- Package
- SOIC-8
- Series
- Interface-Treiber, Empfänger, Transceiver
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 | ADM1490EBRZ | Why it matters |
|---|---|---|---|
| Data Rate | 2.5 Mbps | 16 Mbps | The maximum signaling rate determines whether the transceiver can support the bus speed required by the application; a faster part can replace a slower one if timing margins allow. |
| Duplex Mode | Half-duplex | Full-duplex | Half-duplex uses a single shared pair while full-duplex uses separate transmit and receive pairs, so the wiring topology and pin usage must match the system design. |
| Number of Drivers/Receivers | 1 driver / 1 receiver | 1 driver / 1 receiver | The driver/receiver count defines how many bus lines the device can drive and monitor, affecting multi-node bus architectures. |
| Supply Voltage | 5 V | 5 V | The operating supply voltage must match the system rail; both parts operate from a single 5 V supply, simplifying substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range determines suitability for industrial environments; matching ranges ensure the replacement meets the same environmental requirements. |
| Package / Mounting | 8-SOIC, surface mount | 8-SOIC, surface mount | Package and mounting style must be compatible with the PCB footprint and assembly process for a drop-in replacement. |
| Fail-Safe Receiver | Yes | Yes | Fail-safe receivers guarantee a defined logic output when the bus is idle or open, preventing indeterminate states in the network. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | ESD protection levels indicate robustness against electrostatic discharge on the bus pins, affecting field reliability. |
| Common-Mode Range | -7 V to +12 V | -7 V to +12 V | The common-mode input range defines the allowable ground potential difference between nodes, critical for reliable long-bus operation. |
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 | ADM1490EBRZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Full |
| Receiver Hysteresis | 70 mV | 30 mV |
| Data Rate | 30Mbps | 16Mbps |
| 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 primary differences between the ADM1485JRZ and ADM1490EBRZ?
The ADM1485JRZ is a 5 V low-power RS-485/RS-422 transceiver specified for data rates up to 2.5 Mbps, while the ADM1490EBRZ is a 5 V RS-485/RS-422 transceiver rated for data rates up to 16 Mbps. The ADM1490EBRZ also includes a driver enable (DE) and receiver enable (RE) pin configuration supporting higher-speed operation, whereas the ADM1485JRZ is optimized for lower-speed, low-power applications.
Are the ADM1485JRZ and ADM1490EBRZ pin-compatible?
Both devices are offered in an 8-lead SOIC package (RZ suffix) with the same pinout: RO, RE, DE, DI, GND, A, B, and VCC. This allows them to share a common PCB footprint, but the higher data rate and different slew-rate characteristics of the ADM1490EBRZ must be validated against the target design before substitution.
What data rate does each device support?
The ADM1485JRZ supports data rates up to 2.5 Mbps, while the ADM1490EBRZ supports data rates up to 16 Mbps. The higher rate of the ADM1490EBRZ makes it suitable for faster bus applications, whereas the ADM1485JRZ is intended for lower-speed networks.
Do both devices operate from a single 5 V supply?
Yes. Both the ADM1485JRZ and ADM1490EBRZ are specified for operation from a single 5 V supply (VCC = 5 V ± 5%). Neither device requires a separate logic supply.
How do the driver slew rates differ between the two parts?
The ADM1485JRZ is a low-slew-rate device intended to reduce EMI and reflections on lower-speed buses, consistent with its 2.5 Mbps rating. The ADM1490EBRZ is a high-speed device with faster output transitions to support up to 16 Mbps. The faster edges of the ADM1490EBRZ may require more careful PCB layout and termination to control EMI.
What is the operating temperature range for these transceivers?
Both the ADM1485JRZ and ADM1490EBRZ are specified over the industrial temperature range of −40°C to +85°C, making them suitable for industrial RS-485/RS-422 bus applications.
Can the ADM1490EBRZ directly replace the ADM1485JRZ in an existing design?
Because both parts share the same 8-lead SOIC pinout and 5 V supply, the ADM1490EBRZ can be considered a candidate replacement. However, the higher 16 Mbps data rate and faster slew rate of the ADM1490EBRZ change EMI, termination, and bus-length considerations, so the substitution must be validated against the manufacturer datasheets and the specific bus design before use.