MAX13085EESA+ - 500kbps Fail-Safe RS-485/RS-422 | Analog Devices
MPN: MAX13085EESA+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MAX13085EESA+ Overview
An RS-485/RS-422 transceiver is an interface IC that converts logic-level UART or controller signals into balanced differential bus signals, then converts received differential signals back into CMOS-compatible logic. RS-485 supports multipoint, half-duplex buses, while RS-422 commonly emphasizes point-to-point or driver-receiver links. The MAX13085E family belongs to the transceiver hierarchy: interface transceiver, wired communication interface, and semiconductor.
The MAX13085E provides one driver and one receiver, 500 kbps operation, ±15 kV ESD protection, and fail-safe behavior that forces a logic-high receiver output when inputs are open, shorted, or all bus transmitters are disabled. Its hot-swap capability helps maintain predictable operation during connector mating. The 1/8-unit receiver loading lowers input impedance so as many as 256 compatible transceivers can share one bus.
Its half-duplex architecture requires control of driver enable and receiver enable according to the selected bus topology. Supply filtering, protected cable routing, and correct termination are essential because a compliant transceiver alone does not guarantee an immune field connection. The stated 5 V operating range also requires systems to regulate the device from compatible rail voltages.
Typical uses include industrial sensor buses, building automation, factory equipment, telecom racks, and remote monitoring links. It is particularly useful when a compact bus node needs one bidirectional half-duplex channel, robust electrostatic protection, and deterministic behavior during disabled-driver or hot-plug conditions.
Designers should confirm the manufacturer pinout and enable polarity before routing the PCB, and should not infer RS-485 network performance from the 500 kbps device rate alone. Cabling, topology, termination, grounding, and transceiver matching determine practical range and reliability.
This page combines verified manufacturer data, distributor availability information, and application-oriented engineering guidance. It also separates documented drop-in alternatives from unverified substitutions, helping engineers compare procurement and design options without treating merely similar interface ICs as pin-compatible replacements.
Drop-in alternatives for MAX13085EESA+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX13085EASA+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX13085ECSA+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX13085EASA
✅ Drop-In📋 Reference alternative (not in catalog)
MAX13085EESA+ Specifications
| Product Type | RS-485/RS-422 transceiver |
| Supply Voltage | +5.0 V |
| Maximum Data Rate | 500 kbps |
| Driver Count | 1 |
| Receiver Count | 1 |
| Communication Mode | Half-duplex |
| ESD Protection | ±15 kV |
| Fail-Safe Receiver Output | Logic-high when receiver inputs are open or shorted |
| Hot-Swap Capability | Supported |
| Receiver Input Impedance | 1/8-unit load |
| Maximum Bus Transceivers | 256 transceivers |
| Supply Current | 1.2 mA unloaded or with drivers disabled |
| Package | 8-SOIC |
| Mounting Type | Surface mount |
| Protocol Support | RS-485 and RS-422 |
MAX13085EESA+ 8-soic Pin Configuration Guide
Pin configuration for MAX13085EESA+ (8-soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MAX13085EESA+.
Refer to the datasheet for full pin configuration.
Typical Applications
MAX13085EESA+ is suitable for 6 applications: Industrial Sensor Networks, Building Automation, Telecom Remote Monitoring, Factory Equipment Interfaces, Instrumentation Data Links, Hot-Pluggable Communication Ports.
Industrial Sensor Networks
The MAX13085EESA+ fits industrial sensor nodes that exchange low-to-moderate-rate commands and measurements over a wired RS-485 bus. Its 500 kbps maximum data rate supports factory automation traffic, while the 1/8-unit receiver load permits as many as 256 compatible transceivers according to the verified data. The ±15 kV ESD rating adds valuable connector and board-level protection. Designers should still add appropriate surge protection, use controlled ground returns, and verify that the cable length remains practical at the selected signaling rate.
Recommended
Building Automation
The MAX13085EESA+ can connect thermostats, room controllers, lighting interfaces, and access-control equipment in a 5 V building-automation network. Its fail-safe receiver output provides a defined logic-high condition when inputs are open or shorted or when all transmitters are disabled, reducing uncertainty during inactive bus intervals. Hot-swap support is also useful in serviceable systems. Installation practice still matters because long cables and poor grounding can create conditions beyond the transceiver's internal ESD protection.
Recommended
Telecom Remote Monitoring
The MAX13085EESA+ is appropriate for rack equipment, remote monitoring units, and service interfaces that use RS-485 or RS-422 at rates up to 500 kbps. Fail-safe behavior helps prevent corrupted data when a connected transmitter becomes high impedance, while the compact 8-SOIC package supports dense interface layouts. Because data rate alone does not determine reliable distance, engineers should validate cable type, termination, grounding, and transient protection for the actual installation.
Recommended
Factory Equipment Interfaces
MAX13085EESA+ supports a half-duplex communications channel between a machine controller and remote actuator or sensor interface. The 5 V supply matches equipment architectures that already regulate logic rails, while ±15 kV ESD protection helps manage electrically noisy production environments. The one-driver, one-receiver arrangement is convenient for compact node designs. Enclosure grounding, isolated cable entry, and surge arrestors should be selected for the installation because ESD protection does not replace a complete industrial transient-protection strategy.
Recommended
Instrumentation Data Links
The MAX13085EESA+ can carry commands and measurement data between a laboratory instrument and a remote computer or controller when 500 kbps is sufficient. Differential signaling supports noise-resistant communication, and the documented receiver loading allows numerous bus nodes to coexist. The device is not a high-speed serial PHY, so applications requiring greater bandwidth should choose a faster transceiver. For bench and test systems, keep cable routing away from motors and switching nodes and verify termination according to the selected RS-485 or RS-422 topology.
Recommended
Hot-Pluggable Communication Ports
The MAX13085EESA+ is suitable for service connectors because the manufacturer identifies hot-swap capability and fail-safe receiver behavior as core features. These functions help a node present a known output when bus drivers are disabled or inputs are open or shorted. Hot-plug design is not complete with the IC alone: the system must control power-up, define enable sequencing, protect the cable, and prevent ground transients. Validate connector mating, bus idle state, and restart behavior before using the interface in a critical live-maintenance system.
Recommended
Recommended Products Summary
Engineering reference data for MAX13085EESA+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX13085EASA+ | MAX13085ECSA+ | MAX13085EASA |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-pin SOIC | 8-SOIC | 8-pin SOIC |
| Protocol | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 | RS-485/RS-422 |
| Maximum Data Rate | 500 kbps | 500 kbps | 500 kbps | 500 kbps |
| Driver and Receiver Count | 1 driver, 1 receiver | 1/1 transceiver | 1/1 transceiver | 1/1 transceiver |
| Operating Supply | +5.0 V | Up to 5.5 V | +5.0 V | Up to 5.5 V |
Key Differentiators
- Documented 256-node bus capability (vs MAX13085EASA+)
- Defined behavior during disabled and floating bus conditions (vs MAX13085ECSA+)
- Protection and serviceability for field-bus nodes (vs MAX13085EASA+)
Design Notes
Route the differential driver and receiver traces as a closely coupled pair on the PCB, using a continuous reference plane and minimizing stub branches. Keep the transceiver close to the connector so ESD energy is diverted before entering sensitive logic. Maintain symmetric component placement around the interface pins and follow the manufacturer layout guidance for decoupling. Because the supplied excerpts do not include the complete pin table, verify every enable and supply connection against the official datasheet before fabrication.
Provide a stable 5 V supply and place local high-frequency decoupling at the transceiver's supply pins with a low-inductance return path. Estimated operating dissipation cannot be calculated from the supplied data because no active-driver supply voltage, output termination, and data-duty-cycle values were provided. Validate both the idle 1.2 mA condition and the enabled-driver load in hardware, while monitoring bus fault current and supply droop during repeated transmissions.
Do not assume every RS-485 IC is pin-compatible based only on speed and protocol. Before approving MAX13085EASA+, MAX13085ECSA+, or MAX13085EASA, compare the complete ordering codes, pin names, enable polarity, receiver-fail-safe thresholds, bus loading, and temperature grade. Also distinguish half-duplex control from full-duplex designs. A generic transceiver with a matching data rate may require firmware, layout, or protection changes and therefore is not a verified drop-in replacement.
Termination belongs at the physical ends of a properly configured RS-485 bus rather than at every node. Select cable type and length against the selected 500 kbps signaling rate, and avoid star branches that create reflections. For RS-422, follow the topology and termination scheme required by the system rather than copying an RS-485 network blindly. Confirm ground potential, common-mode limits, and connector return paths with actual cable and loading measurements.
Compliance Information
The supplied verified excerpts do not state compliance results for this exact MPN. Compliance must be confirmed from the current manufacturer product declaration or distributor records; no status was inferred.
