ADUM1251ARZ - I2C Digital Isolator 2500Vrms | Analog Devices
部品番号: ADUM1251ARZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.61 | $6.61 |
| 10 | $5.95 | $59.50 |
| 100 | $5.29 | $529.00 |
| 500 | $4.76 | $2,380.00 |
| 1,000 | $4.23 | $4,230.00 |
ADUM1251ARZ 概要
Digital isolators are components that provide galvanic isolation between two circuits while allowing digital signals to pass. They are essential in systems where ground potential differences or noise could disrupt communication, such as in industrial automation, medical equipment, and power management. The ADUM1251ARZ specifically supports I2C, a widely used two-wire bus, making it a key building block in mixed-voltage and isolated systems.
Key features include a common-mode transient immunity (CMTI) of 25kV/µs, ensuring reliable operation in noisy environments. The device supports hot-swap capability, allowing insertion or removal without powering down the bus. Its bidirectional channels are I2C-compatible on Side 2 and I2C-compatible on Side 1, with modified thresholds for compatibility. The propagation delay is 162ns, and the device is available in both tube and tape-and-reel packaging.
Technically, the ADUM1251ARZ uses Analog Devices' iCoupler technology, which employs chip-scale transformers instead of optocouplers, offering higher reliability and lower power consumption. The device is specified over the industrial temperature range of -40°C to +125°C, making it suitable for harsh environments. It is RoHS compliant and lead-free.
Typical applications include isolating I2C buses in industrial control systems, medical monitoring equipment, and power supply management. The device is also used in battery management systems and automotive electronics where isolation is required for safety and noise immunity.
When designing with the ADUM1251ARZ, ensure proper decoupling with 0.1µF capacitors on both supply pins and maintain adequate PCB layout to minimize parasitic capacitance. The hot-swap feature requires careful consideration of bus capacitance and pull-up resistor values to avoid glitches during insertion.
ドロップイン代替品: ADUM1251ARZ — 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: ADUM1251ARZ （同一形状・フットプリント） — 相違点: Number of Channels, Data Rate, Package, RoHS Status, Supply Voltage Range.
クイック比較ツール — 並列比較する代替部品を選択:
ADUM1250ARZ
✅ ドロップイン✓ 在庫あり
$1.85 / 個
データシートを見る →ADUM1251ARZ-RL7
✅ ドロップイン✓ 在庫あり
$3.9 / 個
データシートを見る →ISO1541DR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ISO1540DR
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
SI8600AB-B-IS1
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADUM1251ARZ 仕様
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 |
| データレート | 1 Mbps |
| Common Mode Transient Immunity | 25 kV/µs |
| Propagation Delay | 162 ns |
| Supply Voltage Range | 3 V to 5.5 V |
| パッケージ | 8-SOIC (0.154", 3.90mm Width) |
| 動作温度範囲 | -40°C to +125°C |
| インターフェースタイプ | I2C |
| Hot-Swap Capable | Yes |
| Bidirectional Channels | Yes |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
| 実装タイプ | Surface Mount |
| ピン数 | 8 |
ADUM1251ARZ ピン構成
| ピン 1 | VDD1 — Supply voltage side 1 |
| ピン 2 | GND1 — Ground side 1 |
| ピン 3 | SDA1 — I2C data side 1 |
| ピン 4 | SCL1 — I2C clock side 1 |
| ピン 5 | SCL2 — I2C clock side 2 |
| ピン 6 | SDA2 — I2C data side 2 |
| ピン 7 | GND2 — Ground side 2 |
| ピン 8 | VDD2 — Supply voltage side 2 |
主な用途
ADUM1251ARZ の用途: 6 件s: Industrial Automation, Medical Equipment, Power Management, Automotive Electronics, IoT and Smart Home, Telecommunications.
Industrial Automation
The ADUM1251ARZ isolates I2C buses in industrial control systems, protecting sensitive logic from ground loops and high-voltage transients. Its 2500Vrms isolation and 25kV/µs CMTI ensure reliable communication in noisy factory environments. The hot-swap capability allows module replacement without system shutdown, improving uptime. With a 1Mbps data rate, it supports fast sensor and actuator communication, while the wide temperature range (-40°C to +125°C) suits harsh conditions.
おすすめ
Medical Equipment
In medical devices, patient safety requires galvanic isolation between low-voltage control circuits and high-voltage sections. The ADUM1251ARZ provides 2500Vrms isolation, meeting safety standards. Its low propagation delay (162ns) ensures real-time data transfer for monitoring systems. The hot-swap feature is beneficial for field-serviceable equipment. The device's small 8-SOIC package fits compact designs, and its low power consumption extends battery life in portable monitors.
おすすめ
Power Management
The ADUM1251ARZ isolates I2C communication between power management controllers and host processors, preventing noise from switching regulators from corrupting data. Its 25kV/µs CMTI ensures stable operation in high dV/dt environments. The device supports hot-swap, allowing power modules to be replaced without powering down the system. With a 3V to 5.5V supply range, it interfaces with various logic levels, and its 1Mbps data rate handles real-time monitoring of voltage and current.
おすすめ
Automotive Electronics
In automotive systems, the ADUM1251ARZ isolates I2C buses in battery management, infotainment, and ADAS modules. Its wide temperature range (-40°C to +125°C) meets AEC-Q100 requirements. The 2500Vrms isolation protects against high-voltage transients from the vehicle's electrical system. The hot-swap feature is useful for battery pack replacement. The device's high CMTI (25kV/µs) ensures reliable communication in the presence of electromagnetic interference from motors and ignition systems.
おすすめ
IoT and Smart Home
The ADUM1251ARZ isolates I2C sensors and actuators in smart home devices, protecting them from ground potential differences. Its low power consumption is ideal for battery-powered IoT nodes. The 1Mbps data rate supports fast sensor polling, while the small SOIC package fits compact designs. The hot-swap feature allows easy sensor replacement without system reset. With 2500Vrms isolation, it provides safety in devices connected to mains power.
おすすめ
Telecommunications
In telecom equipment, the ADUM1251ARZ isolates I2C buses between line cards and control modules, preventing ground loops and noise. Its 2500Vrms isolation meets telecom safety standards. The high CMTI (25kV/µs) ensures reliable operation in environments with lightning surges and switching transients. The device's 1Mbps data rate supports configuration and monitoring of line cards. The hot-swap feature is critical for hot-swappable line cards in redundant systems.
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: ADUM1251ARZ — 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 | ADUM1250ARZ | ADUM1251ARZ-RL7 | ADUM2251ARZ | ISO1541DR | ISO1540DR | SI8600AB-B-IS1 |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 16-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Silicon Labs |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Propagation Delay | 162 ns | 162 ns | 162 ns | 162 ns | 150 ns | 150 ns | 150 ns |
| Supply Voltage Range | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V |
| Hot-Swap Capable | Yes | Yes | Yes | Yes | No | No | No |
主な差別化要因
- Hot-swap capability （vs ISO1541DR)
- Higher CMTI （vs SI8600AB-B-IS1)
- Same-brand drop-in alternatives （vs ADUM1250ARZ)
設計ノート
Place 0.1µF decoupling capacitors close to VDD1 and VDD2 pins to reduce noise and improve signal integrity. Use a ground plane under the device to minimize parasitic inductance. Keep the isolation barrier clear of copper traces to maintain isolation rating.
For high-speed I2C operation, keep the traces between the isolator and I2C devices as short as possible. Use pull-up resistors on both sides of the bus as per I2C specification. Refer to AN-1109 for evaluation board layout techniques to minimize emissions.
Ensure that the I2C bus capacitance does not exceed the maximum specified for the data rate. The hot-swap feature requires careful consideration of bus capacitance and pull-up resistor values to avoid glitches during insertion. Also, verify that Side 1 is only I2C-compatible, not fully I2C-compliant, so it may not work with all I2C devices.
コンプライアンス情報
RoHS compliant per Analog Devices product page. Lead-free. AEC-Q100 not applicable for this non-automotive grade part.
