Analog Devices Inc. ADUM6421AWBRNZ5

Overview

ADUM6421AWBRNZ5 from Analog Devices is a quad-channel digital isolator with integrated isoPower® DC-to-DC converter, delivering 100 mA isolated 3.3 V output from a 5 V primary supply. It provides 100 Mbps signal isolation per channel, 100 kV/µs common-mode transient immunity, and operates up to 125°C - enabling compact, high-reliability isolation in automotive on-board chargers and industrial PLCs.

For engineers reviewing the ADUM6421AWBRNZ5 datasheet, ADUM6421AWBRNZ5 pinout, ADUM6421AWBRNZ5 application, or ADUM6421AWBRNZ5 equivalent, key selection criteria include its AEC-Q100 qualification, CISPR 32 Class B emission compliance at full load on 2-layer PCB, 28-lead SOIC package with 8.3 mm creepage, and precise 3.3 V secondary regulation under varying temperature and load conditions.

Technical Context

The ADUM6421AWBRNZ5 integrates iCoupler® transformer-based signal isolation with a monolithic, regulated isolated DC-to-DC converter using chip-scale magnetic components. Its architecture supports independent 5 V input / 3.3 V isolated output operation with fixed 3.3 V setpoint (±3.3% over temperature and load), 625 kHz PWM control, and thermal shutdown at 154°C.

All four isolation channels are unidirectional (input-side to isolated-side), with propagation delay ≤16 ns (1.8–5 V operation), pulse width distortion ≤5 ns, and channel-to-channel skew ≤5 ns codirectional - ensuring deterministic timing for high-speed serial interfaces and gate drive control loops.

Key Specifications

Pinout & Package

ADUM6421AWBRNZ5 uses a 28-lead, fine-pitch SOIC package (SOIC_W) with 8.3 mm minimum creepage distance between primary and secondary sides. The package is RoHS-compliant and rated for 125°C maximum junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel isolator-with-integrated-DC-DC applications.

Compared with ADUM6421ABRNZ5 and SI88642ED-IS, the ADUM6421AWBRNZ5 uniquely combines AEC-Q100 qualification, 3.3 V/100 mA isolated output, and Class B EMI compliance in a single 28-lead SOIC - making it the only drop-in solution for automotive-grade, high-current isolated power + signal transfer.

Availability

ADUM6421AWBRNZ5 is available at Aetrix Electronics and suitable for automotive on-board charger (OBC), industrial PLC I/O modules, and isolated RS-232 interface designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for ADUM6421AWBRNZ5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADuM642xA family was designed to replace discrete isolation + DC-DC solutions in space- and reliability-constrained systems, targeting automotive traction inverters, industrial automation, and medical isolation barriers.

FAQ

What is the maximum continuous output current of the ADUM6421AWBRNZ5 at 125°C?

The ADUM6421AWBRNZ5 delivers up to 100 mA at 25°C, but output current is derated linearly above 85°C at 1.75 mA/°C. At 125°C, the maximum continuous output current is 30 mA while maintaining 3.3 V regulation within ±3.3%. This derating ensures thermal stability and long-term reliability in high-ambient automotive and industrial environments where the ADUM6421AWBRNZ5 is deployed.

Does the ADUM6421AWBRNZ5 support bidirectional data channels?

No, the ADUM6421AWBRNZ5 features four unidirectional isolation channels (A/B/C/D), each configured for input-side-to-isolated-side signal transfer only. The pinout and internal architecture do not support reverse-direction signaling. For bidirectional applications, designers must use separate dedicated channels or select alternative isolators like the ADUM6422A series, which offers configurable directionality per channel.

Can the ADUM6421AWBRNZ5 be used with a 3.3 V primary supply?

Yes, the ADUM6421AWBRNZ5 supports 3.3 V primary operation (VDDP = 3.3 V), but in that configuration, its isolated output is limited to 30 mA at 3.3 V (per Table 4). The ADUM6421AWBRNZ5 is optimized for 5 V primary input to achieve full 100 mA isolated output. Using 3.3 V primary reduces DC-DC efficiency and output capability - verify load requirements against Table 4's 3.3 V/3.3 V specifications before implementation.

What safety certifications apply to the ADUM6421AWBRNZ5?

The ADUM6421AWBRNZ5 carries UL 1577 recognition (5000 V rms for 1 minute), CSA certification to IEC 62368-1, IEC 61010-1, and IEC 60601-1, and pending VDE V 0884-11 and CQC GB4943.1-2011 approvals. Its VIORM rating is 566 V peak, and it provides 8.3 mm minimum creepage in the 28-lead SOIC package - satisfying reinforced insulation requirements for functional safety in automotive and industrial end-equipment.

How does the ADUM6421AWBRNZ5 handle undervoltage lockout (UVLO)?

The ADUM6421AWBRNZ5 implements independent UVLO on VDD1, VDD2, and VDDP rails, with a positive-going threshold of 1.6 V and negative-going threshold of 1.5 V (0.1 V hysteresis). If any supply drops below 1.5 V, all channels disable and the DC-DC converter shuts down. Recovery occurs only after all supplies exceed 1.6 V, preventing erratic operation during brown-out conditions - a critical feature for robustness in automotive and industrial power systems using the ADUM6421AWBRNZ5.