ADM485ARZ-REEL - 5V 5Mbps Half-Duplex RS-485/RS-422 Transceiver | Analog Devices
部品番号: ADM485ARZ-REEL ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.82 | $1,820.00 |
| 2,500 | $1.62 | $4,050.00 |
ADM485ARZ-REEL 概要
An RS-485 transceiver is a physical-layer interface IC that converts a single-ended TTL/CMOS logic signal into a differential signal transmitted across a twisted-pair cable, then converts the differential signal back into a single-ended logic signal at the receiver. This differential signaling rejects common-mode noise and allows reliable communication over cable lengths up to 1200 m, making RS-485 the most common wired bus for industrial multipoint networks. RS-485 transceivers fall under the broader category of interface ICs in the data-communication PHY layer.
Key features of the ADM485ARZ-REEL include 5 Mbps signaling rate, low power consumption suitable for 5 V single-supply operation, independent driver/receiver enable pins, thermal-shutdown protection, current limiting on the driver outputs, and receiver fail-safe for an open, shorted, or idle bus. The wide common-mode range of -7 V to +12 V exceeds the EIA-485 requirement of -7 V to +12 V, allowing robust operation in electrically noisy industrial environments.
Technically, the ADM485 uses a bipolar CMOS process with a 1 driver + 1 receiver half-duplex topology. Minimal driver propagation delays permit high-speed transmission while low skew minimizes EMI emissions - a key consideration when the part is placed near sensitive analog circuits inside PLCs and motor drives.
Designed for industrial multipoint bus transmission, telematics, and embedded networking, the ADM485ARZ-REEL fits any application where multiple nodes must communicate reliably over a single twisted pair: factory-floor PLC links, building-automation networks, security and surveillance panels, and HVAC fieldbus nodes. The 8-pin SOIC footprint is industry-standard for RS-485 PHYs, simplifying PCB layout and second-sourcing.
A key design tip: place 100 ohm termination only at the two physical ends of the bus; stub lengths must be kept short to suppress signal integrity issues at 5 Mbps. The RE/DE pins allow hardware-driven direction control; tie RE high and use DE to switch direction if the host UART does not natively manage bus direction. This page synthesizes distributor pricing, drop-in same-package alternatives, and SOIC-8 PCB layout guidance not aggregated into the manufacturer datasheet.
ドロップイン代替品: ADM485ARZ-REEL — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADM485ARZ-REEL （同一形状・フットプリント） — 相違点: Package, Protocol, Data Rate, Supply Voltage, Mounting Type.
クイック比較ツール — 並列比較する代替部品を選択:
ADM485JRZ-REEL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM485JRZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1487ESA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX485ESA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN75176BD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ST485ECDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1785CS8
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SIT485EESA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM485ARZ-REEL 仕様
| Type | Transceiver |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| 電源電圧 | 5 V (single supply) |
| データレート | 5 Mbps (max) |
| Common-Mode Range | -7 V to +12 V |
| 動作温度範囲 | -40 C to +85 C |
| パッケージ | SOIC-8 (SO-8) / SO-8 |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| REACH Status | Unaffected |
| MSLレベル | 1 (Unlimited) |
| Compliance | ROHS3 Compliant |
| Enable Pins | Yes (DE driver enable, RE receiver enable, active-low/GPIO logic) |
ADM485ARZ-REEL ピン構成
| ピン 1 | RO — Receiver output (single-ended, referenced to GND) |
| ピン 2 | RE — Receiver enable, active-low (tie to GND to enable) |
| ピン 3 | DE — Driver enable, active-high (tie to VCC to enable) |
| ピン 4 | DI — Driver input (single-ended, TTL/CMOS) |
| ピン 5 | GND — Ground |
| ピン 6 | A — Non-inverting differential bus line |
| ピン 7 | B — Inverting differential bus line |
| ピン 8 | VCC — +5 V power supply |
主な用途
ADM485ARZ-REEL の用途: 6 件s: Industrial PLC Fieldbus Communication, Building Automation Networks (BACnet / Modbus), Security and Surveillance Panels, HVAC Fieldbus Nodes, Embedded Industrial Networking Gateways, Solar Inverter and Energy Storage Communication.
Industrial PLC Fieldbus Communication
The ADM485ARZ-REEL drives multipoint RS-485 links between PLCs, distributed I/O modules, and motor drives on the factory floor. Its 5 Mbps data rate, -7 V to +12 V common-mode range, and -40 C to +85 C industrial temperature range meet the electrical noise, ground-potential difference, and ambient-temperature challenges of industrial control cabinets. The half-duplex 1 driver + 1 receiver topology matches the daisy-chained RS-485 bus topology used in Modbus RTU and PROFIBUS fieldbus segments, where a single twisted pair carries both directions with hardware-controlled direction switching. The 8-pin SOIC footprint simplifies PCB layout in PLC backplane cards, and the part's 5 V single-supply operation interfaces directly to common 5 V logic-level UARTs on PLC mainboards.
おすすめ
Building Automation Networks (BACnet / Modbus)
The ADM485ARZ-REEL serves as the physical-layer transceiver on BACnet MS-TP and Modbus RTU segments that link HVAC controllers, lighting panels, and access-control readers over distances up to 1200 m. Its -7 V to +12 V common-mode range tolerates ground-potential differences between buildings, and the half-duplex topology matches the daisy-chained MS-TP topology specified in the BACnet standard. The 5 Mbps maximum rate covers the modest bandwidth needs of building-automation traffic while leaving margin for future protocol upgrades. The 5 V single-supply and SOIC-8 footprint simplify integration with the low-cost microcontrollers typical in HVAC controllers, lighting panels, and elevator-control units, and the part's receiver fail-safe for an idle bus prevents controller misinterpretation when no driver is active.
おすすめ
Security and Surveillance Panels
The ADM485ARZ-REEL connects multiple keypad, card-reader, and PIR-sensor nodes on the RS-485 bus that links distributed security panels in commercial buildings. The 5 Mbps maximum data rate and -7 V to +12 V common-mode window provide robust operation across the long cable runs and ground-bounce environments typical of multi-floor security installations. Receiver fail-safe for an idle bus prevents false alarms when a remote node is offline or its cable is disconnected, and the half-duplex topology matches the daisy-chained RS-485 wiring used by most commercial intrusion-detection panels. Independent driver/receiver enable control lets the panel host UART manage bus direction directly without external logic.
おすすめ
HVAC Fieldbus Nodes
The ADM485ARZ-REEL is the physical-layer driver inside rooftop-unit controllers, air-handler controllers, and chiller interface boards that communicate over Modbus RTU on a single twisted pair. Its 5 V single-supply operation matches the common 5 V logic rails of HVAC controller boards, and the SOIC-8 footprint enables compact node placement inside the small enclosures typical of rooftop-unit controllers. The -40 C to +85 C industrial temperature grade covers outdoor rooftop installations where ambient temperature can drop below -20 C in winter or exceed +70 C in direct sun. The 5 Mbps maximum rate exceeds the bandwidth needs of typical HVAC telemetry, providing margin for future protocol upgrades to higher-rate BACnet profiles.
おすすめ
Embedded Industrial Networking Gateways
The ADM485ARZ-REEL is the RS-485 physical-layer interface on protocol-conversion gateways that bridge legacy industrial networks to Ethernet-based IIoT backbones. The 5 V single-supply operation simplifies power-tree design inside the gateway enclosure, and the half-duplex 1 driver + 1 receiver topology matches the daisy-chained RS-485 topology of legacy Modbus RTU segments. The -7 V to +12 V common-mode window tolerates ground-potential differences between factory-floor segments that may be powered from different sources. The SOIC-8 footprint minimizes PCB area, allowing the RS-485 interface to fit alongside the gateway's Ethernet PHY, Wi-Fi module, and power supply on a compact 4-layer PCB.
おすすめ
Solar Inverter and Energy Storage Communication
The ADM485ARZ-REEL provides the RS-485 link between string inverters, combiner boxes, and the plant-level data logger in commercial-scale solar installations. Its -7 V to +12 V common-mode window tolerates the large ground-potential differences typical of floating-ground solar arrays, and the -40 C to +85 C industrial temperature grade covers outdoor combiner-box and inverter-tray environments. The 5 Mbps maximum rate exceeds the bandwidth needs of typical solar telemetry (Modbus RTU or Sunspec) while leaving margin for higher-rate diagnostic polling. The 5 V single-supply operation simplifies power-tree design inside combiner-box PCBs that share a 5 V rail with the MPPT controller and protection logic.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADM485ARZ-REEL — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADM485JRZ-REEL7 | MAX1487ESA | SN75176BD | ST485ECDR |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Maxim Integrated | Texas Instruments | STMicroelectronics |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Duplex | Half | Half | Half | Half | Half |
| Drivers / Receivers | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 |
| RoHS Compliance | Yes (ROHS3) | Yes | Yes | Yes | Yes |
主な差別化要因
- Higher maximum data rate than the legacy MAX485 （vs MAX485ESA)
- Wider common-mode tolerance than EIA-485 minimum （vs SN75176BD)
- Industrial temperature grade standard on Z-suffix part （vs SN75176BD)
設計ノート
RS-485 bus signal integrity at 5 Mbps depends on keeping stub lengths short and placing 100 ohm termination only at the two physical ends of the bus. Each stub (the trace from the bus main run to a node's A/B pins) should be kept under one-tenth of the driver's rise-time equivalent length to suppress reflections. Keep the A/B traces as a tightly coupled differential pair with 100 ohm differential impedance; route over a continuous ground plane and avoid splitting the plane under the bus traces.
Do not leave RE floating: the ADM485 receiver enables when RE is LOW, so RE must be tied either to GND (always enabled) or driven by the host. Tie DE to GND during power-up to keep the driver in high impedance until the host initializes. Avoid tying RE and DE together with software-only control because contention can briefly occur during direction switching; if hardware allows, drive DE and RE from separate host GPIO lines to ensure deterministic tri-state timing.
Minimize EMI by placing a 100 nF ceramic decoupling capacitor as close as possible to pin 8 (VCC) with a short, direct trace to pin 5 (GND). For longer cables with high common-mode noise, add a common-mode choke (e.g., 100 ohm at 100 MHz) in series with the A/B lines and provide a low-ESR path to chassis ground through 1 nF / 100 ohm RC network at each cable end. The ADM485's 5 Mbps slew rate can produce significant common-mode current on long cables, so chassis-ground bonding is essential to avoid common-mode voltage exceeding the -7 V to +12 V receiver range.
The 8-SOIC package has a theta_JA of approximately 160 C/W on a standard JEDEC 4-layer test board, which is adequate for the ADM485's low supply current (typically under 1 mA quiescent plus load-dependent driver current). Power dissipation is dominated by the output current delivered into the bus termination, so at 5 Mbps with 100 ohm termination the part dissipates well under 100 mW. No heatsink is required. Ensure the supply trace can deliver the worst-case short-circuit current limit (typically 250 mA per the datasheet) without significant IR drop.
コンプライアンス情報
ROHS3 compliant per Analog Devices product page and the partgenie.ai summary. REACH unaffected per the same. Not AEC-Q100 qualified - this part is intended for industrial/commercial use, not automotive. Halogen-free and conflict-minerals status not explicitly listed in the verified web data.
