Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Supply | 3.3 V |
| Data rate | 12 Mbps |
| Duplex | Half duplex |
| ESD on RS-485 I/O | ±15 kV |
| Bus nodes | Up to 32 |
| Common-mode input range | −7 V to +12 V |
| Fail-safe | Receiver open-circuit fail-safe |
| Package | 8-lead SOIC_N, R-8 |
| Operating temperature | −40°C to +85°C |
Product Overview
ADM3485EARZ-REEL7 is a 3.3 V half-duplex RS-485/RS-422 transceiver with 12 Mbps signaling and ±15 kV ESD protection on its RS-485 I/O. Driver and receiver share the differential bus pair, with separate enable controls for direction management.
The E-suffixed ADM3485E must be kept distinct from ADM3485. The supplied ADM3485E datasheet specifies 12 Mbps operation and the enhanced bus-pin ESD rating, so these values should not be transferred to a non-E order code.
Key Features
- 12 Mbps half-duplex operation from a 3.3 V rail.
- ±15 kV ESD protection on RS-485 I/O.
- −7 V to +12 V bus common-mode range.
- Open-circuit fail-safe receiver and thermal protection.
Functional Highlights
At 12 Mbps, line impedance, termination, and stub length become significant system constraints.
The 75176-compatible pin arrangement can simplify evaluation, but voltage, timing, ESD, and fail-safe behavior still need exact-part comparison before substitution.
Application Fit
- Industrial control networks.
- Telecommunications RS-485 links.
- Power and energy metering interfaces.
- EMI-sensitive multipoint serial systems.
Design Considerations
- Terminate the bus for the actual cable impedance and keep stubs short.
- Coordinate DE and /RE timing to avoid bus contention.
- Check the −7 V to +12 V common-mode range against expected ground offset.
- Use the exact R-8 SOIC_N land pattern.
Product Status
Manufacturer status: PRODUCTION
Analog Devices currently lists ADM3485EARZ-REEL7 as PRODUCTION.
Related Engineering Resources
Alternative Candidates for Engineering Evaluation
| MPN | Manufacturer | Package |
|---|---|---|
| ADM3485EARZ-REEL | ADI | SOIC-8 |
| GM3485E | GATEMODE | SOP-8 |
| HG3485EIM/TR | HGSEMI | SOP-8 |
| ADM3485EARZ | ADI | SOIC-8 |
| HT6508ARZ | HTCSEMI | SOP-8 |
| HT3485EARZ | HTCSEMI | SOP-8 |
| HT3485EBRZ | HTCSEMI | SOP-8 |
| HT83485ARZ | HTCSEMI | SOP-8 |
| HT4853ARZ | HTCSEMI | SOP-8 |
| HT6506ARZ | HTCSEMI | SOP-8 |
| CBM3485AS8 | Corebai Microelectronics | SOIC-8 |
Candidate alternative parts require engineering verification before substitution. Electrical characteristics, pinout, package, qualification, and application requirements should be verified before use.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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To request a quotation, provide the exact manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
