ADM208EAR - 4/4 RS-232 Transceiver, 200kbps | Analog Devices
部品番号: ADM208EAR ✓ 生産中ADM208EAR 概要
An RS-232 transceiver is an interface IC that translates low-voltage digital signals into RS-232-compatible line levels and converts received line levels back into CMOS-compatible logic. The ADM2xxE family belongs to the broader hierarchy of transceiver IC, interface IC, communications IC, and semiconductor. Unlike a simple RS-232 driver or receiver, this integrated device combines four transmitters and four receivers, making it useful where multiple serial channels must share one board.
The ADM208EAR's principal features include a single 5 V supply, 0.1 µF charge-pump capacitors, four RS-232 drivers, four RS-232 receivers, and operation at up to 200 kbps. The manufacturer identifies the device as compliant with the EU EMC Directive 89/336/EEC. Its listed electrostatic-discharge protection reaches 15 kV for human-body-model and air-gap discharge and 8 kV for contact discharge. It also meets fast-transient burst-immunity requirements under IEC 1000-4-4 and low-emissions requirements under EN55022.
The integrated charge-pump design creates the positive and negative voltage levels required by RS-232 while allowing the interface to operate from only one 5 V rail. Four drivers make it appropriate for equipment that must support multiple outbound serial channels, while four receivers support multiple inbound channels. A maximum data rate of 200 kbps accommodates legacy industrial peripherals, laboratory instruments, and control equipment that operate below the highest RS-232 rates available in newer interface families.
Typical uses include multi-channel industrial controllers, data-logging systems, test and measurement instruments, service interfaces, and embedded serial-port concentrators. Its 24-lead SOIC package provides more I/O than a 16-pin dual transceiver while remaining suitable for conventional through-hole or surface-mount PCB assembly. In systems with several legacy peripherals, the four-channel architecture can reduce the number of separate driver and receiver ICs required.
Circuit design should follow the manufacturer's recommended capacitor connections and keep the charge-pump and interface traces compact. Place the required 0.1 µF capacitors close to their designated pins, provide a stable 5 V rail, and route each RS-232 signal away from sensitive analog and high-speed digital paths. External protection may still be considered for cables connected to unprotected external equipment, even though the device includes substantial ESD protection.
This product page organizes the ADM208EAR specifications, lifecycle status, package information, drop-in alternatives, application guidance, and design notes into one engineering reference. It also distinguishes the four-channel ADM208EAR from nearby interface ICs by package, channel count, data rate, protection, and control features so engineers can make a board-level compatibility decision before purchasing.
ドロップイン代替品: ADM208EAR — 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。
ADM207EARZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADM211EARZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADM206EARZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADM203EARZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADM208EARZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADM208EAR 仕様
| Device Type | RS-232 transceiver |
| Driver Count | 4 drivers |
| Receiver Count | 4 receivers |
| 電源電圧 | 5 V |
| Maximum Data Rate | 200 kbps |
| Charge-Pump Capacitance | 0.1 µF |
| Interface Standard | RS-232 |
| Compatibility Standard | EIA-232 and CCITT V.28 |
| パッケージ | 24-lead SOIC |
| 実装タイプ | Surface mount |
| 動作温度範囲 | -40 °C to +85 °C |
| ESD Protection, Human Body Model | 15 kV |
| ESD Protection, Air-Gap Discharge | 15 kV |
| ESD Protection, Contact Discharge | 8 kV |
| EMC Compliance | EU Directive 89/336/EEC |
| Fast-Transient Burst Immunity | IEC 1000-4-4 |
| Low EMI Emissions | EN55022 |
| Production Status | Production |
ADM208EAR 24-lead soic ピン配置ガイド
ADM208EAR (24-lead soic パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: ADM208EAR.
詳細は データシート をご参照ください。
主な用途
ADM208EAR の用途: 6 件s: Industrial Serial Port Concentrator, Data Acquisition and Logger Equipment, Test and Measurement Instrument, Embedded Configuration and Service Port, Telecommunications Support Equipment, Medical and Laboratory Monitoring Interface.
Industrial Serial Port Concentrator
The ADM208EAR fits multi-port industrial controllers that must communicate with several legacy RS-232 peripherals through one 5 V interface circuit. Four drivers and four receivers reduce the number of separate transceiver packages required, while the 200 kbps maximum data rate accommodates common control, configuration, and monitoring links. Its listed IEC 1000-4-4 fast-transient immunity is useful around motor drives and factory equipment. Place the 0.1 µF charge-pump capacitors close to their pins, and route protected external cable connections according to the manufacturer layout and system grounding guidance.
おすすめ
Data Acquisition and Logger Equipment
The ADM208EAR is appropriate for data loggers and acquisition systems that need several RS-232 links to instruments, computers, or service terminals. The four-driver, four-receiver arrangement supports multiple devices without duplicating the line-driver and receiver circuitry, and the single 5 V supply simplifies system power planning. At a maximum rate of 200 kbps, the interface suits many laboratory and industrial serial protocols. Its 15 kV human-body-model and air-gap ESD ratings provide useful baseline protection, although long external cables may still need dedicated surge and common-mode protection.
おすすめ
Test and Measurement Instrument
The ADM208EAR can connect laboratory instruments and automated test systems to legacy RS-232 controllers through a combination of four transmit and four receive channels. Its 200 kbps rate is well matched to many legacy instrument-control protocols, and the 24-lead SOIC package supports conventional PCB assembly. The -40 °C to +85 °C operating range also suits industrial test benches. Design the PCB with short charge-pump connections, solid grounding, and isolated separation between sensitive measurement circuits and RS-232 routing to prevent cable-borne transients from coupling into precision analog sections.
おすすめ
Embedded Configuration and Service Port
The ADM208EAR is useful in embedded controllers that expose one or more service, configuration, or diagnostic interfaces while operating from a single 5 V rail. Even when only one RS-232 link is populated, the four-channel architecture allows the same PCB to support different product configurations or additional external adapters. The interface reaches 200 kbps and includes substantial listed ESD and EMC protection for industrial environments. Use the shutdown or enable behavior of any selected family member only after checking its exact pinout, because related ADM2xxE devices may assign auxiliary functions differently.
おすすめ
Telecommunications Support Equipment
The ADM208EAR can provide legacy RS-232 connectivity in telecommunications support equipment, terminal controllers, and remote-maintenance units. Four transmitters and four receivers permit several service or diagnostic links without requiring a separate transceiver for every channel, and the 5 V operation simplifies compatibility with contemporary embedded logic. The listed -40 °C to +85 °C range and EMC protections support controlled equipment environments. Keep long external RS-232 cables away from sensitive traces, provide chassis-ground strategy appropriate to the installation, and add qualified surge protection when cables leave the enclosure.
おすすめ
Medical and Laboratory Monitoring Interface
The ADM208EAR can serve as a multi-port service interface for laboratory analyzers and monitoring equipment that retains RS-232 connectivity to controllers or service computers. Its four-driver, four-receiver configuration consolidates several legacy communication links, while the 200 kbps rate is suitable for typical configuration and status traffic. ESD ratings of 15 kV for human-body and air-gap discharge help reduce risk from routine cable-contact events. Nevertheless, medical and laboratory installations should implement the required isolation, protective grounding, and patient-safety separation outside the IC rather than relying on the transceiver alone.
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: ADM208EAR — 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 | ADM207EARZ | ADM211EARZ | ADM206EARZ | ADM203EARZ | ADM208EARZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-lead SOIC | 24-lead SOIC | 24-lead SOIC | 24-lead SOIC | 24-lead SOIC | 24-lead SOIC |
| Driver Count | 4 drivers | 4 drivers | 4 drivers | 4 drivers | 4 drivers | 4 drivers |
| Receiver Count | 4 receivers | 4 receivers | 4 receivers | 4 receivers | 4 receivers | 4 receivers |
主な差別化要因
- Four-channel integration reduces the number of separate RS-232 interface ICs （vs MAX3232IPW)
- Single 5 V operation simplifies the negative-rail interface architecture （vs ADM211EARZ)
- 200 kbps class operation suits established legacy serial protocols （vs ADM206EARZ)
- Substantial listed ESD protection for connector-facing interfaces （vs ADM203EARZ)
設計ノート
Place the manufacturer's specified 0.1 µF charge-pump capacitors directly beside their designated pins and keep their return paths short. Add local high-frequency bypass on the 5 V supply and avoid routing charge-pump current through areas carrying sensitive receiver inputs. Because the device supports four receivers, assign the ground and signal-reference strategy carefully; long return paths can reduce noise immunity or create ground-potential problems between connected equipment.
Separate RS-232 driver outputs from receiver inputs and sensitive analog traces even though both functions share one package. Route external cable-side nets directly toward the device and connector, and avoid sharing narrow copper sections with unrelated signals. The listed 15 kV air-gap and human-body-model ESD protection reduces connector-contact risk, but it does not eliminate the need for controlled cable routing, chassis grounding, or external protection in severe industrial environments.
Do not treat every 24-lead ADM2xxE-family device as an automatic replacement. Related parts can change the maximum data rate, driver and receiver behavior, auxiliary shutdown or enable pins, supply current, and protection ratings. Before substituting any listed alternative, compare the complete manufacturer pin table and RS-232 electrical characteristics. Also verify that the selected ordering code uses the same 24-lead SOIC footprint rather than a narrow SOIC, SSOP, or TSSOP variant.
コンプライアンス情報
The target documentation identifies compliance with EU EMC Directive 89/336/EEC, IEC 1000-4-4 fast-transient burst immunity, and EN55022 low-emissions requirements. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status are not established for the exact MPN.
