ADUM1445ARWZ - Micropower Quad Digital Isolator | Analog Devices
MPN: ADUM1445ARWZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.1 | $2,100.00 |
ADUM1445ARWZ Overview
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.
Drop-in alternatives for ADUM1445ARWZ — 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 ADUM1445ARWZ (same form factor and footprint) — differing in Package, Isolation Voltage, Current per Channel (ENx=0), Current per Channel (ENx=1).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM1446ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.1 / Unit
View Datasheet →ADUM1447ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.6 / Unit
View Datasheet →ADUM1441ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.1 / Unit
View Datasheet →ADUM1442ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.25 / Unit
View Datasheet →ADUM1445ARWZ Specifications
| Number of Channels | 4 |
| Directionality | 4/1 (4 forward, 1 reverse) |
| Isolation Voltage | 2500 Vrms |
| Data Rate | 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 |
| Operating Temperature Range | -40°C to +125°C |
| Package | 16-Lead SOIC-W |
| Mounting Type | Surface Mount |
| Default Output State | Low |
| Technology | iCoupler |
| RoHS Status | Compliant |
ADUM1445ARWZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 (3.0V to 3.6V) |
| Pin 2 | GND1 — Ground for side 1 |
| Pin 3 | VIA — Input channel A (forward) |
| Pin 4 | VIB — Input channel B (forward) |
| Pin 5 | VIC — Input channel C (forward) |
| Pin 6 | VID — Input channel D (forward) |
| Pin 7 | EN1 — Enable for side 1 (active high, internal refresh control) |
| Pin 8 | GND1 — Ground for side 1 |
| Pin 9 | VOD — Output channel D (reverse) |
| Pin 10 | VOC — Output channel C (forward) |
| Pin 11 | VOB — Output channel B (forward) |
| Pin 12 | VOA — Output channel A (forward) |
| Pin 13 | EN2 — Enable for side 2 (active high, internal refresh control) |
| Pin 14 | GND2 — Ground for side 2 |
| Pin 15 | VDD2 — Supply voltage for side 2 (3.0V to 3.6V) |
| Pin 16 | GND2 — Ground for side 2 |
Typical Applications
ADUM1445ARWZ is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1445ARWZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Ultra-low power consumption (vs ADUM1445ARQZ)
- Wide-body SOIC package for higher isolation (vs ADUM1445ARQZ)
- Default low output state for fail-safe operation (vs ADUM1446ARWZ)
Design Notes
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.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance data not specified in the provided data.
