ADUM141D - Quad Digital Isolator, 150Mbps | Analog Devices
MPN: ADUM141D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.35 | $2.35 |
| 10 | $2.1 | $21.00 |
| 100 | $1.82 | $182.00 |
| 500 | $1.65 | $825.00 |
| 1,000 | $1.5 | $1,500.00 |
ADUM141D Overview
Digital isolators are electronic components that transmit digital signals across an isolation barrier, providing galvanic isolation to protect circuits from high voltages, ground loops, and noise. They are essential in applications where safety and signal integrity are critical, such as industrial automation, medical equipment, and communication systems. Unlike optocouplers, digital isolators offer higher speed, better timing accuracy, and longer lifespan, making them the preferred choice for modern designs.
Key features of the ADUM141D include a maximum propagation delay of 13 ns and pulse width distortion of less than 3 ns at 5 V operation, ensuring precise signal transmission. The device also features fail-safe high or low output options, which define the output state when the input power is not applied or inputs are disabled, enhancing system safety. The input disable function allows the outputs to be placed in a high-impedance state, useful for multiplexing or power saving. The device is RoHS compliant and supports high-temperature operation up to 125°C, making it suitable for harsh environments.
The ADUM141D uses iCoupler technology, which employs chip-scale transformer coils separated by polyimide insulation layers. This architecture ensures dc correctness in the absence of input logic transitions, a significant advantage over optocouplers that require continuous input current. The device also provides low dynamic power consumption, making it energy-efficient for battery-powered applications.
Typical applications include general-purpose multichannel isolation, serial peripheral interface (SPI) isolation, data converter isolation, and industrial fieldbus communication. The high CMTI and fast data rates make it ideal for motor control, power inverters, and isolated ADC/DAC interfaces.
When designing with the ADUM141D, ensure proper PCB layout with adequate creepage and clearance distances for the required isolation rating. Place decoupling capacitors close to the VDD1 and VDD2 pins to minimize noise. The input disable pins (DISABLE1 and DISABLE2) can be used to control the outputs, but must be handled carefully to avoid unintended state changes.
Drop-in alternatives for ADUM141D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM141E
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM140D
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM142D
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
Si8641
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM141D Specifications
| Number of Channels | 4 (3 forward, 1 reverse) |
| Channel Configuration | 3:1 |
| Isolation Rating | 3.0 kV RMS / 3.75 kV RMS |
| Data Rate | 150 Mbps |
| Propagation Delay | 13 ns (max) |
| Pulse Width Distortion | 3 ns (max) |
| Common-Mode Transient Immunity (CMTI) | 75 kV/µs (BRWZ), 100 kV/µs (automotive) |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40°C to +125°C |
| Package | 16-lead SOIC (wide body, 7.50 mm) |
| Input Disable | Yes (DISABLE1 and DISABLE2 pins) |
| Fail-Safe Output | High or Low options |
| Level Translation | 1.8 V to 5 V |
| RoHS Compliance | Compliant |
| UL 1577 Insulation Test Voltage | ≥ 3600 V rms for 1 sec |
ADUM141D Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 |
| 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 | DISABLE1 — Disable input for side 1 outputs |
| Pin 7 | GND1 — Ground for side 1 |
| Pin 8 | NC — No connect |
| Pin 9 | NC — No connect |
| Pin 10 | DISABLE2 — Disable input for side 2 outputs |
| Pin 11 | VOD — Output channel D (reverse) |
| Pin 12 | VOC — Output channel C (forward) |
| Pin 13 | VOB — Output channel B (forward) |
| Pin 14 | VOA — Output channel A (forward) |
| Pin 15 | GND2 — Ground for side 2 |
| Pin 16 | VDD2 — Supply voltage for side 2 |
Typical Applications
ADUM141D is suitable for 6 applications: SPI Isolation, Industrial Fieldbus Isolation, Motor Control, Isolated ADC/DAC Interface, Medical Equipment Isolation, Power Inverter Isolation.
SPI Isolation
The ADUM141D is ideal for isolating SPI buses in mixed-voltage systems. With three forward channels for MOSI, SCLK, and CS, and one reverse channel for MISO, it provides complete isolation for SPI communication. The high data rate of 150 Mbps supports fast SPI clocks, while the low propagation delay ensures timing accuracy. The device's level translation capability allows interfacing between 3.3 V and 5 V domains without additional circuitry. In a typical application, the ADUM141D is placed between a microcontroller and a peripheral, such as an ADC or DAC, to prevent ground loops and protect sensitive components from high voltages. The input disable feature can be used to tri-state the outputs during power-down or for multiplexing multiple peripherals.
Recommended
Industrial Fieldbus Isolation
In industrial automation, the ADUM141D provides galvanic isolation for fieldbus communication interfaces such as RS-485, CAN, and Profibus. Its high CMTI of 75 kV/µs ensures reliable operation in noisy environments with fast voltage transients from motors and drives. The wide operating temperature range of -40°C to +125°C makes it suitable for harsh industrial conditions. The device's fail-safe output options ensure that the bus remains in a defined state during power loss or input disconnection, preventing system errors. The ADUM141D can be used to isolate the controller side from the transceiver side, protecting the microcontroller from ground potential differences and electrical noise. Its low propagation delay and pulse width distortion maintain signal integrity over long cable runs.
Recommended
Motor Control
The ADUM141D is used in motor control systems to isolate the gate driver signals from the microcontroller, protecting the control circuitry from high-voltage transients. Its high CMTI of 100 kV/µs (automotive variant) ensures reliable operation in the presence of fast switching voltages in the power stage. The device's fast propagation delay of 13 ns allows precise timing of PWM signals, essential for efficient motor control. The input disable feature can be used to safely disable the gate drivers during fault conditions. The ADUM141D's wide supply range and level translation capability enable interfacing between the 3.3 V logic side and the 5 V gate driver side. In a typical application, the isolator is placed between the microcontroller's PWM outputs and the gate driver IC, providing both isolation and level shifting.
Recommended
Isolated ADC/DAC Interface
The ADUM141D provides isolation between precision ADCs/DACs and the host processor, preventing ground loops and reducing noise in measurement systems. Its low propagation delay and pulse width distortion ensure accurate data transfer, while the high data rate supports high-resolution converters. The device's level translation allows the ADC to operate at a different supply voltage than the processor, optimizing performance. In a typical application, the ADUM141D is used to isolate the digital interface of an ADC, such as the AD7124-4, from the microcontroller. The input disable feature can be used to power down the ADC interface when not in use, saving power. The device's high CMTI ensures reliable operation in industrial environments with electrical noise.
Recommended
Medical Equipment Isolation
In medical devices, the ADUM141D provides galvanic isolation to protect patients and operators from electrical hazards. Its high isolation rating of 3.75 kV RMS meets safety standards for medical equipment. The device's low power consumption and small footprint make it suitable for portable devices. The fail-safe output options ensure that the system enters a safe state during power loss. The ADUM141D can be used to isolate patient-connected sensors from the processing unit, preventing leakage currents. Its high data rate supports real-time monitoring applications. The device's wide temperature range and RoHS compliance make it suitable for medical environments.
Recommended
Power Inverter Isolation
The ADUM141D is used in power inverters to isolate the control signals from the high-voltage power stage. Its high CMTI of 100 kV/µs ensures reliable operation in the presence of fast switching transients. The device's fast propagation delay allows precise control of the inverter's switching timing, improving efficiency. The input disable feature can be used to safely shut down the inverter during fault conditions. The ADUM141D's wide supply range and level translation capability enable interfacing between the low-voltage control circuitry and the high-voltage gate drivers. In a typical application, the isolator is placed between the microcontroller's PWM outputs and the gate driver ICs, providing both isolation and level shifting. The device's high temperature rating of 125°C makes it suitable for the thermal environment of power inverters.
Recommended
Recommended Products Summary
Engineering reference data for ADUM141D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM141E | ADUM140D | ADUM142D | ISO7741 | Si8641 |
|---|---|---|---|---|---|---|
| Package | 16-lead SOIC (wide body) | 16-lead SOIC (wide body) | 16-lead SOIC (wide body) | 16-lead SOIC (wide body) | 16-lead SOIC (wide body) | 16-lead SOIC (wide body) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Silicon Labs |
| Channel Configuration | 3:1 (3 forward, 1 reverse) | 3:1 (3 forward, 1 reverse) | 4:0 (4 forward) | 2:2 (2 forward, 2 reverse) | 4:0 (4 forward) | 4:0 (4 forward) |
| Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 100 Mbps | 150 Mbps |
| Isolation Rating | 3.75 kV RMS | 3.75 kV RMS | 3.75 kV RMS | 3.75 kV RMS | 5 kV RMS | 5 kV RMS |
| CMTI | 75 kV/µs (standard), 100 kV/µs (automotive) | 75 kV/µs | 75 kV/µs | 75 kV/µs | 100 kV/µs | 75 kV/µs |
| Propagation Delay | 13 ns | 13 ns | 13 ns | 13 ns | 10.7 ns | 13 ns |
| Input Disable | Yes | Yes | Yes | Yes | No | No |
Key Differentiators
- Input disable feature (vs ISO7741)
- Higher data rate (vs ISO7741)
- Automotive-qualified variants (vs Si8641)
Design Notes
For the ADUM141D, ensure proper PCB layout to maintain the isolation rating. Provide adequate creepage and clearance distances between the high-voltage and low-voltage sides, as per the datasheet recommendations. Place decoupling capacitors (0.1 µF) close to VDD1 and VDD2 pins to minimize noise. Use a solid ground plane on each side, but do not connect the grounds together across the isolation barrier.
The ADUM141D operates from 1.8 V to 5.5 V on both sides. Ensure that the supply voltages are within the specified range and that the power supply is stable. The device consumes low dynamic power, but the input disable feature can be used to reduce power consumption further by placing the outputs in a high-impedance state. Consider using a low-dropout regulator (LDO) to provide clean power to the isolator.
A common pitfall is misinterpreting the fail-safe output options. The ADUM141D offers fail-safe high or low options, which determine the output state when the input power is not applied or inputs are disabled. Ensure that the correct fail-safe option is selected for the application to avoid unexpected system behavior. Also, verify the channel configuration (3:1) matches the signal direction requirements.
Compliance Information
RoHS compliant per Analog Devices datasheet. Automotive variants are AEC-Q100 qualified, but the standard ADUM141D is not.
