ADUM1445ARWZ - Micropower Quad Digital Isolator | Analog Devices
MPN： ADUM1445ARWZ ✓ 啟用中ADUM1445ARWZ 概覽
Digital isolators are essential components in systems that require signal transfer across an isolation barrier to protect low-voltage circuitry from high-voltage transients, ground loops, or noise. They are commonly used in industrial automation, medical equipment, and communication interfaces where safety and signal integrity are paramount. The ADUM1445ARWZ belongs to the family of digital isolators, which are part of the broader category of interface ICs, and specifically to the micropower segment that minimizes power consumption for battery-powered or energy-efficient designs.
Key features of the ADUM1445ARWZ include its ultra-low power consumption: in standard operating mode with internal refresh enabled (ENx = 0), the current per channel is less than 10 µA, and with internal refresh disabled (ENx = 1), it drops to less than 1 µA. This makes it ideal for power-sensitive applications. The device also offers a wide operating temperature range of -40°C to +125°C, ensuring reliability in harsh environments. The 2500 Vrms isolation rating provides robust protection against voltage spikes and ground potential differences.
Technically, the ADUM1445ARWZ uses Analog Devices' iCoupler technology, which combines high-speed CMOS and monolithic air core transformers to achieve isolation without the need for external components. The device supports a 2 Mbps data rate, which is sufficient for many control and monitoring applications. The CMTI of 25 kV/µs ensures that the isolator can reject fast transients, making it suitable for noisy industrial environments. The default low output state ensures that if the input power is lost, the output defaults to a known safe state, which is critical for fail-safe designs.
Typical applications for the ADUM1445ARWZ include industrial fieldbus communication, isolated SPI interfaces, and general-purpose signal isolation in motor drives, power inverters, and medical monitoring equipment. Its low power consumption makes it particularly well-suited for battery-operated instruments and portable devices where every microamp counts.
When designing with the ADUM1445ARWZ, it is important to ensure proper decoupling of the VDD1 and VDD2 supplies with 0.1 µF capacitors placed close to the pins. Additionally, the ENx pins can be used to disable the internal refresh, further reducing power consumption in applications where the data rate is low and the input signals are static. Care should be taken to maintain the recommended operating conditions to ensure reliable isolation performance.
直接替換替代品，適用於 ADUM1445ARWZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADUM1445ARWZ （相同外形與佔位） — 差異在於 Package, Isolation Voltage, Current per Channel (ENx=0), Current per Channel (ENx=1).
ADUM1446ARWZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADUM1447ARWZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADUM1441ARWZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADUM1442ARWZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADUM1445ARWZ 規格
| Number of Channels | 4 |
| Directionality | 4/1 (4 forward, 1 reverse) |
| Isolation Voltage | 2500 Vrms |
| 資料速率 | 2 Mbps |
| Common-Mode Transient Immunity (CMTI) | 25 kV/µs |
| Supply Voltage (VDD1/VDD2) | 3.0 V to 3.6 V |
| Current per Channel (ENx=0) | <10 µA |
| Current per Channel (ENx=1) | <1 µA |
| 工作溫度範圍 | -40°C to +125°C |
| 封裝 | 16-Lead SOIC-W |
| 安裝類型 | Surface Mount |
| Default Output State | Low |
| Technology | iCoupler |
| RoHS 狀態 | Compliant |
ADUM1445ARWZ 腳位配置
| 腳位 1 | VDD1 — Supply voltage for side 1 (3.0V to 3.6V) |
| 腳位 2 | GND1 — Ground for side 1 |
| 腳位 3 | VIA — Input channel A (forward) |
| 腳位 4 | VIB — Input channel B (forward) |
| 腳位 5 | VIC — Input channel C (forward) |
| 腳位 6 | VID — Input channel D (forward) |
| 腳位 7 | EN1 — Enable for side 1 (active high, internal refresh control) |
| 腳位 8 | GND1 — Ground for side 1 |
| 腳位 9 | VOD — Output channel D (reverse) |
| 腳位 10 | VOC — Output channel C (forward) |
| 腳位 11 | VOB — Output channel B (forward) |
| 腳位 12 | VOA — Output channel A (forward) |
| 腳位 13 | EN2 — Enable for side 2 (active high, internal refresh control) |
| 腳位 14 | GND2 — Ground for side 2 |
| 腳位 15 | VDD2 — Supply voltage for side 2 (3.0V to 3.6V) |
| 腳位 16 | GND2 — Ground for side 2 |
典型應用
ADUM1445ARWZ 適用於 6 應用s: Industrial Fieldbus Communication, Isolated SPI Interface, Motor Drive Control, Medical Monitoring Equipment, Battery-Powered IoT Devices, Power Inverter Systems.
Industrial Fieldbus Communication
The ADUM1445ARWZ provides galvanic isolation for fieldbus interfaces such as RS-485 and CAN, protecting microcontrollers from ground loops and voltage transients. Its 2 Mbps data rate and 25 kV/µs CMTI ensure reliable communication in noisy industrial environments. The low power consumption (<10 µA per channel) is beneficial for power-constrained field devices. The 4/1 directionality supports bidirectional communication, making it suitable for half-duplex fieldbus protocols.
推薦
Isolated SPI Interface
The ADUM1445ARWZ can isolate SPI signals between a microcontroller and peripheral devices such as ADCs or DACs. With four forward channels, it can carry SCLK, MOSI, and two chip-select lines, while the reverse channel handles MISO. The 2 Mbps data rate is sufficient for many SPI peripherals. The default low output state ensures that the slave device is deselected if the isolator loses power, preventing bus contention. The 2500 Vrms isolation protects sensitive logic from high-voltage transients.
推薦
Motor Drive Control
In motor drives, the ADUM1445ARWZ isolates the low-voltage control circuitry from the high-voltage power stage. Its high CMTI of 25 kV/µs ensures that fast switching transients from the IGBTs or MOSFETs do not corrupt the control signals. The 2500 Vrms isolation provides safety isolation between the control and power domains. The low power consumption is advantageous in compact drive designs where heat dissipation is a concern. The default low output state ensures that the motor is safely disabled if the control power is lost.
推薦
Medical Monitoring Equipment
The ADUM1445ARWZ is used in medical devices to isolate patient-connected sensors from the main processing unit, ensuring patient safety. Its 2500 Vrms isolation rating meets the requirements for many medical isolation standards. The low power consumption is critical for battery-operated portable monitors. The wide operating temperature range of -40°C to +125°C ensures reliable operation in various clinical environments. The default low output state provides a fail-safe condition in case of power loss.
推薦
Battery-Powered IoT Devices
The ADUM1445ARWZ is ideal for IoT devices that require isolation between communication interfaces and the main controller while operating from a battery. Its micropower consumption (<1 µA per channel with refresh disabled) extends battery life significantly. The 2 Mbps data rate is sufficient for sensor data transmission. The 4/1 directionality allows for bidirectional communication with peripherals. The small SOIC-W package is suitable for space-constrained designs.
推薦
Power Inverter Systems
In solar inverters and UPS systems, the ADUM1445ARWZ isolates the control electronics from the high-voltage DC bus. Its 2500 Vrms isolation provides safety isolation, while the high CMTI ensures reliable operation in the presence of fast switching transients. The low power consumption reduces the burden on the auxiliary power supply. The default low output state ensures that the inverter shuts down safely if the control power is lost. The wide temperature range supports operation in outdoor environments.
推薦
推薦產品摘要
工程參考資料，適用於 ADUM1445ARWZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADUM1445ARQZ | ADUM1446ARWZ | ADUM1441ARWZ |
|---|---|---|---|---|
| Package | 16-Lead SOIC-W | 16-Lead QSOP | 16-Lead SOIC-W | 16-Lead SOIC-W |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Data Rate | 2 Mbps | 2 Mbps | 2 Mbps | 2 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Directionality | 4/1 | 4/1 | 4/1 | 2/2 |
| Default Output State | Low | Low | High | Low |
| Supply Voltage Range | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V |
主要差異化特點
- Ultra-low power consumption (對比ADUM1445ARQZ)
- Wide-body SOIC package for higher isolation (對比ADUM1445ARQZ)
- Default low output state for fail-safe operation (對比ADUM1446ARWZ)
設計說明
The ADUM1445ARWZ consumes very low power, but proper decoupling is essential. Place 0.1 µF ceramic capacitors close to VDD1 and VDD2 pins to filter high-frequency noise. For optimal performance, use a 10 µF capacitor in parallel for bulk decoupling, especially when the isolator is switching at 2 Mbps.
To maintain the isolation rating, ensure that the PCB layout provides adequate creepage and clearance between the two sides of the isolator. The SOIC-W package has a minimum creepage of 8 mm, but the PCB must also have a slot or gap under the component to prevent surface leakage. Follow the recommended layout in the datasheet to achieve 2500 Vrms isolation.
Do not exceed the absolute maximum supply voltage of 3.6 V on VDD1 or VDD2. Also, ensure that the ENx pins are properly configured: ENx=0 enables internal refresh (higher power), while ENx=1 disables it (lower power). If the input signals are static, disabling refresh can significantly reduce power consumption, but be aware that the output may not update if the input changes while refresh is disabled.
合規資訊
RoHS compliant per Analog Devices product page. Other compliance data not specified in the provided data.
