Analog Devices Inc. ADUM3221BRZ

Overview

ADUM3221BRZ from Analog Devices is an isolated dual-channel gate driver IC with 4 A peak output current, 60 ns maximum propagation delay, and 5 ns channel-to-channel matching. It operates with 3.3 V–5.5 V input logic and 4.5 V–18 V output drive, supporting MOSFET/IGBT switching in high-noise industrial power converters.

For engineers reviewing the ADUM3221BRZ datasheet, ADUM3221BRZ pinout, ADUM3221BRZ application, or ADUM3221BRZ equivalent, this page delivers verified timing specs, isolation safety ratings, UVLO thresholds for VDD2, thermal shutdown behavior, and precise functional distinctions versus ADUM3220 variants.

Technical Context

The ADUM3221BRZ implements iCoupler® monolithic transformer isolation across two independent channels, enabling true galvanic separation between input control logic (Side 1) and high-side/high-current output stage (Side 2). Its architecture integrates CMOS input decoding, level shifting, and AND-gated output drivers without external components.

Unlike the ADUM3220, the ADUM3221BRZ lacks shoot-through protection logic-allowing simultaneous high-state outputs-and features B-grade UVLO (7.0 V rising threshold on VDD2), optimized for 7.6 V–18 V output supply operation. Propagation delay remains tightly controlled (≤62 ns at 3.3 V input, ≤68 ns at 4.5 V VDD2) with <7 ns channel-to-channel skew over temperature and voltage.

Key Specifications

Pinout & Package

Narrow-body 8-lead SOIC package (5 mm × 6 mm × 1.6 mm), RoHS-compliant, with creepage/clearance ≥4.01 mm / 4.90 mm for reinforced isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel isolated gate driver applications.

Compared with ADUM3221ARZ, the ADUM3221BRZ provides higher VDD2 UVLO hysteresis and better noise margin for 8–15 V gate drive rails; versus SI8261BBC-C-ISR, it offers pin-compatible SOIC-8 layout, native 3.3 V logic compatibility, and iCoupler® magnetic immunity advantages in high-dV/dt environments.

Availability

ADUM3221BRZ is available at Aetrix Electronics and suitable for isolated motor drives, solar microinverters, industrial PLC output stages, and high-reliability DC/DC converters requiring stable component supply and long-term lifecycle support.

Supply support for ADUM3221BRZ 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, headquartered in Norwood, MA.

The ADUM3221BRZ belongs to the iCoupler® isolated gate driver product line, designed specifically for robust, high-speed, reinforced-isolation gate driving in industrial, automotive, and energy infrastructure systems.

FAQ

What is the key functional difference between ADUM3221BRZ and ADUM3220BRZ?

The ADUM3221BRZ allows both outputs to be high simultaneously, whereas the ADUM3220BRZ includes shoot-through protection logic that prevents concurrent high states. This makes ADUM3221BRZ suitable for applications like H-bridges requiring independent channel control, while ADUM3220BRZ is preferred for half-bridge configurations where shoot-through must be avoided by design. Both share identical pinout, isolation rating, and timing specs.

Does ADUM3221BRZ support 3.3 V input logic levels?

Yes, ADUM3221BRZ fully supports 3.3 V input logic: its VIH threshold is 0.7 × VDD1 and VIL is 0.3 × VDD1, so with VDD1 = 3.3 V, VIH = 2.31 V and VIL = 0.99 V - compatible with standard 3.3 V CMOS outputs. Input current remains within ±10 µA across temperature, ensuring minimal loading on upstream controllers.

What is the VDD2 undervoltage lockout behavior of ADUM3221BRZ?

The ADUM3221BRZ is a B-grade device: its VDD2 UVLO has a rising threshold of 7.0 V and falling threshold of 6.0 V, with 1.0 V hysteresis. When VDD2 drops below 6.0 V, both outputs force low; recovery occurs only after VDD2 exceeds 7.0 V. This prevents unstable gate drive during brownout in 8–15 V gate supply rails commonly used with 12 V or 15 V bias supplies.

Can ADUM3221BRZ drive SiC MOSFETs effectively?

Yes, ADUM3221BRZ is well-suited for SiC MOSFET gate driving: its 4 A peak source/sink current, <25 ns rise/fall times (at 10 V VDD2), and 1 MHz data rate support fast switching with low gate charge devices. The 25 kV/μs CMTI and reinforced 560 V peak working voltage ensure reliable operation in high-dV/dt SiC half-bridge circuits without false triggering.

Is ADUM3221BRZ qualified for automotive applications?

Yes, ADUM3221BRZ is explicitly qualified for automotive applications per the datasheet's "Automotive Products" section. It meets AEC-Q100 stress test requirements and operates across −40°C to +125°C junction temperature. Its VDE-certified reinforced insulation and thermal shutdown at >150°C support under-hood use in battery management systems and traction inverters.