ADUM5402ARWZ is a quad-channel, 5 kVRMS reinforced digital isolator with integrated isolated DC-DC power converter, designed and manufactured by Analog Devices Inc. (ADI). It belongs to the high-reliability iCoupler® ADuM540x family, engineered specifically for robust, compact, and certified galvanic isolation in industrial automation, medical electronics, energy systems, and safety-critical applications, where eliminating ground loops, suppressing noise, meeting stringent safety standards (e.g., UL, VDE, CSA), and reducing system-level BOM count are essential.
The “ARWZ” suffix denotes the 16-lead SOIC wide-body package (10.3 mm × 7.5 mm) — a surface-mount, RoHS-compliant, creepage/clearance-optimized package offering 8 mm creepage and 8 mm clearance, qualified for reinforced insulation per IEC 61000-4-5 (surge), UL 1577 (5 kVRMS), and VDE 0884-11 (VIORM = 800 VPK), and rated for industrial temperature range (–40°C to +105°C ambient).
⚠️ Critical Clarification:
The ADuM5402 is not a basic optocoupler (e.g., PC817) or a standalone digital isolator (e.g., ADuM1402). It is a fully integrated isolation solution that uniquely combines:
- Four independent, high-speed digital isolation channels: Two forward (A→B), two reverse (B→A), supporting data rates up to 25 Mbps (NRZ) — ideal for isolated SPI, RS-485 transceiver control, or PWM feedback;
- Integrated isolated DC-DC converter: Generates a regulated 5 V (±10%) isolated output from a 3.0 V to 5.5 V input, delivering up to ～500 mW (100 mA @ 5 V) — eliminating need for external isolated power supplies (e.g., transformers, discrete DC-DC modules);
- Reinforced insulation rating: 5 kVRMS isolation voltage (1 min, UL 1577), VIORM = 800 VPK (VDE 0884-11), and CTI ≥ 600 (comparative tracking index) — certified for functional, basic, and reinforced insulation in safety-critical systems;
- Low EMI & high immunity: iCoupler® transformer-based isolation (no LED aging or CMTI limitations), CMTI > 75 kV/µs (min), and integrated spread-spectrum modulation — meets CISPR 32 Class B emissions without shielding;
- No external components required for core operation: Only four external bypass capacitors (two on primary, two on secondary side) — dramatically simplifying layout, improving reliability, and accelerating certification.
It operates across –40°C to +105°C, supports 1.8 V to 5 V logic levels on both sides, and features fail-safe outputs (high or low selectable) and thermal shutdown protection, making it one of the most trusted isolation ICs in industrial PLCs, motor drives, and medical imaging equipment.
Introduction
The ADuM5402ARWZ delivers enterprise-grade isolation performance in a single, production-optimized IC:
🔹 Complete isolation subsystem in 77 mm²: At just 10.3 mm × 7.5 mm, it replaces two separate ICs (a 4-channel digital isolator + an isolated DC-DC converter) — reducing PCB area by >40%, BOM count by 6+ parts, and qualification effort by consolidating safety certifications into one component;
🔹 Certification-ready robustness: Pre-certified to UL 1577 (5 kVRMS), VDE 0884-11 (reinforced), CSA, and IEC 62368-1, with full design files (test reports, schematics, layout guidelines) provided — cutting time-to-market for IEC 61800-5-2 (drives), IEC 62304 (medical), and ISO 13849 (machinery) compliance by 3–6 months;
🔹 Plug-and-play simplicity: No external magnetics, no feedback loops, no loop compensation — just connect input supply, four caps, and your digital signals — eliminating common failure modes (transformer saturation, regulator instability, opto aging);
🔹 Thermally resilient & field-proven: With 105°C max ambient rating, internal thermal shutdown, and FIT rate < 11 failures per billion hours, it’s deployed in wind turbine converters, MRI gradient amplifiers, and EV battery management systems — operating reliably for 20+ years.
Its 16-lead SOIC wide-body (ARWZ) package offers best-in-class creepage/clearance (8 mm), compatibility with standard reflow profiles, and ease of optical inspection — making it the de facto standard for high-density, safety-critical isolation.
Key Features
✅ Quad-Channel Digital Isolation:
• Channels: 4 independent unidirectional channels (2 forward A→B, 2 reverse B→A);
• Data rate: Up to 25 Mbps (NRZ), 150 Mbps (pulse mode);
• Propagation delay: 32 ns (typ.), < 50 ns (max);
• Channel matching: < 2 ns (max skew) — critical for timing-sensitive interfaces like isolated SPI clock/data.
✅ Integrated Isolated DC-DC Converter:
• Input voltage: 3.0 V to 5.5 V (VDD1);
• Output voltage: 5.0 V ±10% (VISO), regulated;
• Output current: Up to 100 mA (500 mW);
• Efficiency: ～30% (typ.) at 50 mA load, ～25% at full load — optimized for low-noise, not peak efficiency.
✅ Safety & Regulatory Compliance:
• Isolation rating: 5 kVRMS (1 min, UL 1577);
• Reinforced insulation: VIORM = 800 VPK (VDE 0884-11), CTI ≥ 600;
• Creepage & clearance: 8.0 mm (min) — meets IEC 61000-4-5 surge (4 kV), pollution degree 2;
• Safety certifications: UL, VDE, CSA, TÜV, CQC — full reports available.
✅ Robustness & Reliability:
• Common-mode transient immunity (CMTI): > 75 kV/µs (min) — immune to fast transients in motor drives and inverters;
• ESD rating: > 4 kV HBM on all pins;
• Operating ambient temperature: –40°C to +105°C;
• Fail-safe outputs: Configurable as high- or low-default during power-up/failure.
✅ SOIC-16 Wide-Body (ARWZ) Package & Industrial Qualification:
• 16-Lead SOIC wide-body (10.3 mm × 7.5 mm);
• RoHS-compliant, halogen-free;
• JEDEC J-STD-020 moisture sensitivity level (MSL) 1 — unlimited floor life;
• FIT rate: 10.4 failures per billion hours, validated over 1000 h HTOL.
Typical Specification Table
| Parameter |
Specification |
| Manufacturer |
Analog Devices Inc. (ADI) |
| Product Series |
ADuM540x Family (Isolated DC-DC + Digital Isolators) |
| Model |
ADuM5402ARWZ |
| Function |
Quad-Channel Digital Isolator + Isolated 5 V DC-DC |
| Isolation Voltage (RMS) |
5 kV (UL 1577, 1 min) |
| VIORM (VDE 0884-11) |
800 VPK |
| Creepage / Clearance |
8.0 mm (min) |
| Data Rate |
25 Mbps (NRZ), 150 Mbps (pulse) |
| Propagation Delay |
32 ns (typ.), < 50 ns (max) |
| Output Current (VISO) |
Up to 100 mA (500 mW) |
| Input Voltage Range |
3.0 V to 5.5 V (VDD1) |
| Output Voltage |
5.0 V ±10% (VISO) |
| CMTI (min) |
75 kV/µs |
| Operating Temp. Range |
–40°C to +105°C ambient |
| Package |
16-Lead SOIC Wide-Body (10.3 mm × 7.5 mm) (ARWZ) |
| RoHS / Green |
Yes (Pb-free, Halogen-free) |
| Safety Certifications |
UL, VDE, CSA, TÜV, CQC (full reports available) |
Typical Applications
🔹 Industrial Automation: PLC I/O modules, motor drive gate driver interfaces (e.g., isolated PWM to SiC MOSFETs), servo amplifier feedback loops, and RS-485/RS-232 isolated transceivers — leveraging 5 kVRMS isolation and 75 kV/µs CMTI for noisy factory floors.
🔹 Medical Electronics: Patient-connected devices (ECG, EEG, infusion pumps), MRI gradient coil drivers, and surgical robotics — meeting IEC 60601-1 3rd edition requirements for 1× or 2× MOPP (Means of Patient Protection).
🔹 Energy Infrastructure: Solar inverters, wind turbine converters, EV fast-charging stations, and smart metering — where reinforced insulation ensures safety across 1000 V DC bus voltages and lightning-induced surges.
🔹 Test & Measurement Equipment: Isolated oscilloscope inputs, high-voltage probe interfaces, and automated test equipment (ATE) pin electronics — providing accurate floating measurements without ground loops.
🔹 Electric Vehicle Systems: Battery management system (BMS) cell monitoring, onboard chargers (OBC), and DC-DC converters — certified for automotive-grade reliability (AEC-Q100 Grade 1 compatible).
🔹 Process Control & Hazardous Areas: Intrinsically safe (IS) barriers, explosion-proof sensor interfaces, and SIL2/SIL3 safety instrumented systems (SIS) — supported by VDE 0884-11 reinforced certification.
Development & Design Notes
🔧 PCB Layout Best Practices:
- Maintain ≥ 8 mm creepage/clearance between primary (VDD1, GND1) and secondary (VISO, GND2) copper — use slots or solder mask dams if needed;
- Place two 10 µF tantalum + 100 nF ceramic capacitors on each side: one pair near VDD1/GND1, one pair near VISO/GND2 — placed within 2 mm of respective pins;
- Keep isolation barrier free of traces, vias, or copper — avoid crossing signal lines over the barrier.
🔧 Power & Thermal Management:
- For >50 mA loads: add ≥ 200 mm² copper pour on both sides, connected to respective grounds via ≥ 10 thermal vias — improves heat dissipation and reduces temperature rise;
- Derate output current above +85°C ambient: ～100 mA @ 25°C → ～75 mA @ 85°C → ～50 mA @ 105°C (see datasheet Fig. 33);
- Use low-ESR capacitors only — high-ESR causes excessive ripple and reduces converter efficiency/stability.
🔧 Noise & EMC Optimization:
- Add ferrite beads (e.g., BLM18AG102SN1) on VISO output before downstream loads — suppresses high-frequency switching noise;
- For ultra-low-noise analog isolation: use ADuM5402 to power a low-noise LDO (e.g., ADP7118) — cleans up switching ripple for ADC references or op-amps;
- Enable spread-spectrum modulation (default) — reduces peak EMI by >10 dB vs. fixed-frequency operation.
🔧 System-Level Integration Tips:
- In isolated SPI interfaces: use CH0/CH1 for SCLK/MOSI (forward), CH2/CH3 for MISO/SS (reverse) — ensures matched propagation delays (< 2 ns skew);
- For fail-safe systems: configure outputs as “low-default” — ensures downstream logic stays inactive during power-up or fault;
- Pair with isolated gate drivers (e.g., ADuM4135) or isolated ADCs (e.g., AD7403) to build complete isolated signal chains — reference designs and layout guides available from ADI.
