ADM485AQ - 5 V Low-Power RS-485/422 Transceiver | Analog Devices
MPN: ADM485AQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5507 | $1.55 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
| 3,000 | $0 | $0.00 |
ADM485AQ Overview
An RS-485 transceiver is an interface IC that converts single-ended logic signals into a differential signal and receives differential signals back into logic levels. Its differential signaling improves noise immunity and allows reliable communication over longer cable runs. The ADM485 belongs to the RS-485/RS-422 transceiver family within interface ICs and the broader industrial-communications semiconductor hierarchy.
Key verified features include support for both EIA RS-485 and RS-422, operation from a single 5 V supply, extremely fast switching speeds, minimal driver propagation delay, and operation over the commercial and industrial temperature range. The analog.devices.com product description specifically highlights data rates up to 5 Mbit/s and low skew for reduced EMI interference. The AQ package designation identifies the ceramic-DIP ordering option represented by the verified distributor listings.
The device is intended for balanced data transmission on multipoint bus transmission lines. Its driver and receiver architecture supports robust two-wire RS-485 networks as well as compatible RS-422 point-to-point or multidrop arrangements, subject to the system-level termination and biasing requirements specified in the manufacturer documentation. The 5 V supply simplifies interfacing with conventional digital logic systems.
Typical uses include industrial automation controllers, sensor and instrumentation links, factory data buses, laboratory equipment, and embedded control systems. For a new board, verify the exact ceramic-DIP footprint, pin orientation, supply decoupling, cable termination, and protection requirements before layout release. ADM485AQ is not an automotive-qualified transceiver in the verified data.
This page combines the verified ADM485 product-page information, distributor pricing references, package details, and replacement guidance for engineers evaluating an 8-pin ceramic-DIP RS-485 interface. Because the supplied source excerpts do not expose the complete electrical tables, pin names, lifecycle statement, or certified drop-in replacement list, missing values remain explicitly marked as data-needed rather than inferred.
Drop-in alternatives for ADM485AQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADM485AQ (same form factor and footprint) — differing in Operating Temperature Range, Package, Supply Voltage, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM485ARZ
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →SN75176BD
✅ Drop-In✓ In Stock
$0.1501 / Unit
View Datasheet →MAX485EPE+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX485CSE+
✅ Drop-In📋 Reference alternative (not in catalog)
ST485BN
✅ Drop-In📋 Reference alternative (not in catalog)
ADM485AQ Specifications
| Product Type | Differential RS-485/RS-422 line transceiver |
| Supply Voltage | 5 V |
| Maximum Data Rate | 5 Mbit/s |
| Driver and Receiver Count | 1 differential driver and 1 differential receiver |
| Communication Standards | EIA RS-485 and RS-422 |
| Topology | Bidirectional multipoint bus transmission lines |
| Operating Temperature Range | Commercial and industrial temperature range |
| Package | 8-pin ceramic DIP |
| Package Designation | AQ |
| Switching Speed | Extremely fast switching speed |
| Driver Propagation Delay | Minimal |
| Differential Signaling | Balanced data transmission |
| EMI Behavior | Low skew is designed to minimize EMI interference |
| Mounting Style | Through-hole |
ADM485AQ aq Pin Configuration Guide
Pin configuration for ADM485AQ (aq 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 ADM485AQ.
Refer to the datasheet for full pin configuration.
Typical Applications
ADM485AQ is suitable for 6 applications: Industrial Automation Bus, Factory Sensor Networks, Laboratory Instrumentation, Embedded Control Communication, Building and HVAC Controls, Data Acquisition Systems.
Industrial Automation Bus
The ADM485AQ fits industrial automation links that need a balanced differential interface between a controller and remote field equipment. Its verified 5 V supply and data-rate capability of up to 5 Mbit/s suit short industrial bus segments, while the receiver provides a differential signal path that is less susceptible to common-mode noise than a single-ended connection. The designer should still account for cable length, node count, termination, idle biasing, and industrial surge protection. A 5 V transceiver also requires a local regulator or supply rail with appropriate noise control and decoupling.
Recommended
Factory Sensor Networks
The ADM485AQ can connect remote sensors and actuator controllers over a balanced RS-485 segment when the system prioritizes noise immunity and multi-drop capability. Its differential driver and receiver architecture is appropriate for industrial environments where motor equipment, switching supplies, and long cables can introduce transients. Use termination at the two bus ends and bias resistors to establish a defined idle state. Protection networks and chassis-ground strategy should be selected for the installation because the supplied source excerpts do not specify transient ratings.
Recommended
Laboratory Instrumentation
The ADM485AQ is suitable for connecting laboratory instruments, data-acquisition modules, and computer-controlled test fixtures over a short balanced RS-485 link. The verified 5 Mbit/s capability provides margin for instrument control and status traffic, while differential signaling helps maintain data integrity near switching power stages. Keep the cable pair tightly routed and provide local bypass capacitance at the transceiver supply. The system designer should define grounding and isolation policy, especially when instruments are connected to high-voltage or earth-referenced test equipment.
Recommended
Embedded Control Communication
The ADM485AQ can serve as the communication front end for an embedded controller that must exchange commands and telemetry with remote equipment. Its single-driver, single-receiver arrangement is convenient for a half-duplex two-wire bus when firmware controls transmit enable timing. Compared with a single-ended UART link, the differential interface improves common-mode rejection. Firmware must enforce bus turnaround delays and avoid multiple drivers driving the pair simultaneously. Verify logic thresholds and timing against the complete datasheet before finalizing firmware timing margins.
Recommended
Building and HVAC Controls
The ADM485AQ is applicable to building-control and HVAC equipment where distributed controllers communicate over a wired field bus. Its differential RS-485/RS-422 interface is useful when controllers and sensors are spread across a panel or building and the cable path may pass near motors and switching loads. The device supports up to 5 Mbit/s, allowing short control networks to maintain responsive communication. System integration still requires correct polarity, termination, grounding, surge mitigation, and a defined protocol; the transceiver alone does not define the application protocol.
Recommended
Data Acquisition Systems
The ADM485AQ can connect remote transducers and measurement front ends to a data-acquisition controller when a balanced bus is preferred for noise rejection. Its receiver converts differential bus levels into logic signals, while the driver supports command transmission back toward remote nodes. The verified 5 Mbit/s rate is ample for many control and status messages, but designers should account for cable propagation, baud-rate error, and bus topology. Place the transceiver near the cable entry and supply bypass, and consider galvanic isolation when ground potentials or surge exposure exceed the application requirements.
Recommended
Recommended Products Summary
Engineering reference data for ADM485AQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM485ARZ | SN75176BD | MAX485EPE+ | ST485BN |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Texas Instruments | Maxim Integrated | STMicroelectronics |
| Package | 8-pin ceramic DIP | 8-pin ceramic DIP | 8-pin SOIC | 8-pin DIP | 8-pin DIP |
| Communication Standard | EIA RS-485 and RS-422 | ADM485 family; exact standard details not supplied | RS-485/RS-422 related interface | RS-485 related interface | RS-485/RS-422 |
| Drop-In Verification | Target device | Same-family lead required | Same-package and pinout verification required | Same-package and pinout verification required | Same-package and pinout verification required |
Key Differentiators
- Verified 5 Mbit/s operation (vs SN75176BD)
- Same-family Analog Devices sourcing path (vs ADM485ARZ)
- Balanced RS-485/RS-422 positioning (vs MAX485EPE+)
Design Notes
Place the ADM485AQ close to the RS-485 cable entry and route the differential pair as a tightly coupled pair. Keep the pair away from switching nodes, high-current return paths, and isolated barriers unless the system architecture specifically accounts for those crossings. For a ceramic-DIP design, preserve the mechanical lead spacing and connector clearances of the selected board footprint; the supplied data does not include the full land pattern, so use the manufacturer package drawing.
Do not treat a family-name equivalent as a drop-in replacement without checking the exact pinout. In a two-wire bus, the differential pair must have termination at the two physical ends, and an idle-bias network may be needed to prevent a floating bus. Confirm direction-control timing in firmware so that only one driver actively transmits at a time. These practices reduce false transitions, bus contention, and unreliable receiver states.
Use a local bypass capacitor close to the transceiver supply pins and keep the 5 V return path short. The verified excerpts do not provide the recommended capacitor values or supply-current limits, so those values must be taken from the complete ADM485 datasheet and the surrounding transceiver network. Avoid routing the RS-485 cable return through high-current logic ground when a separate or isolated reference strategy is available.
Compliance Information
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable based on the available evidence because this product is presented as an industrial RS-485/RS-422 interface rather than an automotive-qualified device.
