Part A
ADM485EARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3013 PCS
- Package
- SOIC-8
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Compatible functional replacement candidate
The ADM485EARZ is a functional upgrade candidate for the ADM485JRZ, sharing the same RS-485 transceiver function, 8-pin SOIC package, and 5 V supply rail, while offering enhanced ESD protection and a wider operating temperature range. Designers should validate the enhanced ESD rating and extended temperature specifications against their application requirements before substituting.
Function and Protocol
High match
Package and Pinout
High match
ESD Protection Rating
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADM485JRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5246 PCS
- Package
- SOIC-8
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
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 | ADM485EARZ | Why it matters |
|---|---|---|---|
| Data Rate | 5 Mbps | 2.5 Mbps | Maximum signaling speed; the JRZ supports higher throughput, which may matter for high-speed bus applications. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) with enhanced IEC 61000-4-2 (±8 kV contact / ±15 kV air) | The EARZ variant offers enhanced system-level ESD immunity, improving robustness in harsh industrial environments. |
| Fail-Safe Receiver | Not specified / standard | True fail-safe (open, short, terminated) | True fail-safe guarantees a defined logic-high output when the bus is idle, open, or shorted, preventing indeterminate states. |
| Operating Temperature Range | 0°C to +70°C | -40°C to +85°C | The EARZ supports industrial temperature ranges, enabling use in wider environmental conditions. |
| Supply Current (Typical) | ~300 µA (quiescent) | ~300 µA (quiescent) | Quiescent current affects power budget in low-power or battery-backed systems. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V supply, so power rail compatibility is identical. |
| Duplex Mode | Half-duplex | Half-duplex | Both are half-duplex RS-485 transceivers, so bus topology and wiring requirements match. |
| Number of Drivers / Receivers | 1 / 1 | 1 / 1 | Identical driver/receiver count ensures the same network node configuration applies. |
| Package | 8-lead SOIC | 8-lead SOIC | Same package footprint allows drop-in PCB replacement without layout changes. |
| Pin Count | 8 | 8 | Identical pin count and pinout support direct substitution on existing boards. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485EARZ | 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 | 2.5Mbps | 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 primary differences between the ADM485JRZ and ADM485EARZ?
The ADM485JRZ is a standard 5 V, low-power RS-485/RS-422 transceiver specified for data rates up to 5 Mbps, while the ADM485EARZ is an enhanced ESD-protected version of the same transceiver family, featuring ±15 kV ESD protection on the RS-485 bus pins (IEC 61000-4-2) and specified for data rates up to 5 Mbps. Both are 8-lead SOIC devices with identical pinouts, but the EARZ variant adds enhanced ESD robustness.
Are the ADM485JRZ and ADM485EARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: RO, RE, DE, DI, GND, A, B, and VCC. This allows the ADM485EARZ to be used as a drop-in replacement for the ADM485JRZ on an existing PCB layout, provided the enhanced ESD rating is acceptable for the application.
What data rate do the ADM485JRZ and ADM485EARZ support?
Both the ADM485JRZ and ADM485EARZ are specified for data rates up to 5 Mbps, making them suitable for standard RS-485/RS-422 communication links. The data rate is determined by the driver and receiver specifications in the respective Analog Devices datasheets.
What is the ESD protection difference between the ADM485JRZ and ADM485EARZ?
The ADM485EARZ includes enhanced ESD protection on the RS-485 bus pins (A and B), rated to ±15 kV using the IEC 61000-4-2 contact discharge method, as specified in the Analog Devices datasheet. The ADM485JRZ does not carry this enhanced ESD rating and relies on standard handling and board-level protection. Designs exposed to harsh ESD environments should favor the ADM485EARZ.
Do both devices operate from a single 5 V supply?
Yes. Both the ADM485JRZ and ADM485EARZ operate from a single 5 V ±5% supply (4.75 V to 5.25 V) and are specified for the industrial temperature range of −40°C to +85°C, per the Analog Devices datasheets.
Can the ADM485EARZ directly replace the ADM485JRZ in an existing design?
In most cases yes, because the two parts share the same 8-lead SOIC package, pinout, supply voltage, and 5 Mbps data rate. The ADM485EARZ offers superior ESD performance, so substituting it for the ADM485JRZ generally improves robustness without requiring layout changes. Verify the target design's ESD and transient requirements against the ADM485EARZ datasheet before substitution.
What is the quiescent supply current of the ADM485JRZ and ADM485EARZ?
Both devices are low-power RS-485 transceivers with quiescent supply current typically in the low hundreds of microamperes range when the driver is disabled, as specified in the Analog Devices datasheets. For exact typical and maximum values, consult the respective ADM485 datasheet, since the EARZ variant may differ slightly due to its enhanced ESD structure.