Analog Devices Inc. ADUM4120-1BRIZ

Overview

ADUM4120-1BRIZ from Analog Devices is a single-channel, isolated gate driver IC with 2.3 A peak output current, 7.3 V VDD2 UVLO threshold (Grade B), and 42 ns maximum rising-edge propagation delay. It delivers galvanic isolation between low-voltage control logic (2.5–6.5 V) and high-side power stages (4.5–35 V), enabling robust IGBT/MOSFET switching in industrial inverters and GaN/SiC-based power supplies.

For engineers reviewing the ADUM4120-1BRIZ datasheet, ADUM4120-1BRIZ pinout, ADUM4120-1BRIZ application, or ADUM4120-1BRIZ equivalent, this device is selected for high-CMTI (>150 kV/μs), precise timing-critical gate drive where input glitch filtering is disabled and secondary-side undervoltage lockout must trigger at 7.3 V (typical positive-going).

Technical Context

The ADUM4120-1BRIZ uses iCoupler® chip-scale transformer isolation with OOK encoding to transmit CMOS-level logic across a reinforced insulation barrier. Its architecture integrates isolated power domain management, thermal shutdown (155°C), and dual UVLO-fixed 2.5 V on VDD1 and selectable Grade B (7.3 V) on VDD2-to ensure fail-safe operation during brownout conditions.

Unlike optocoupler-based drivers, it eliminates LED aging and current transfer ratio drift, while delivering sub-50 ns propagation delay matching and <17 ns pulse width distortion under 2 nF load. The default-low output state and internal NMOS/PMOS gate resistances (0.6–1.8 Ω) support direct connection to enhancement-mode power devices without external pull-downs.

Key Specifications

Pinout & Package

ADUM4120-1BRIZ is housed in a wide-body 6-lead SOIC package (SOIC_WB) with 8 mm minimum creepage and clearance, optimized for reinforced isolation in high-voltage systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM4120-1ARIZ and ADUM4120-1CRIZ, the ADUM4120-1BRIZ offers intermediate VDD2 UVLO (7.3 V) ideal for 12–15 V gate drive systems-balancing immunity to supply sag while avoiding premature enable in mid-range rails.

Availability

ADUM4120-1BRIZ is available at Aetrix Electronics and suitable for industrial motor drives, switch-mode power supplies, GaN power converters, and renewable energy inverters requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ADUM4120-1BRIZ 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 ADUM4120/ADUM4120-1 product line was designed specifically for isolated gate driving in high-reliability power conversion systems-emphasizing precision timing, reinforced safety certification, and immunity to harsh electrical environments.

FAQ

What is the key functional difference between ADUM4120-1BRIZ and ADUM4120BRIZ?

The ADUM4120-1BRIZ has the input glitch filter disabled, resulting in lower propagation delay (22–42 ns rising edge) compared to the ADUM4120BRIZ (44–68 ns). Both share identical Grade B VDD2 UVLO (7.3 V), 2.3 A output, and 6-lead SOIC packaging. The -1 suffix denotes absence of the internal input noise filter, making ADUM4120-1BRIZ optimal for ultra-fast switching applications where minimal latency is critical.

Does ADUM4120-1BRIZ support both high-side and low-side gate driving configurations?

Yes, ADUM4120-1BRIZ is a single-channel, unidirectional isolated gate driver capable of driving either high-side or low-side N-channel MOSFETs, IGBTs, or GaN FETs. Its VOUT pin sources and sinks 2.3 A peak current, and its isolated GND2 reference allows direct connection to floating source/emitter nodes in half-bridge or three-phase inverter topologies without additional level-shifting circuitry.

What safety certifications apply to ADUM4120-1BRIZ?

ADUM4120-1BRIZ carries pending UL 1577 recognition (5 kV rms, 1 min), CSA Component Acceptance Notice 5A, and VDE V 0884-10 certification (VIORM = 849 V peak, reinforced insulation). It meets IEC 60601-1 (2 MOPP), IEC 61010-1, and GB4943.1-2011 requirements. Final certificates are issued upon completion of qualification testing, and design-in may proceed using pending status per Analog Devices' compliance documentation.

How does the Grade B UVLO setting impact system startup behavior in ADUM4120-1BRIZ?

In ADUM4120-1BRIZ, the Grade B UVLO sets the VDD2 rising-edge threshold to 7.3 V (typical), meaning the output remains disabled until the high-side supply reaches ≥7.3 V. This prevents partial gate turn-on during slow-ramping DC bus voltages-common in soft-start PFC stages-and ensures full gate drive strength is available before switching begins, reducing conduction losses and thermal stress on power devices.

Can ADUM4120-1BRIZ drive SiC MOSFETs directly without external components?

Yes, ADUM4120-1BRIZ can directly drive most discrete SiC MOSFETs with gate thresholds ≤4 V and Qg ≤50 nC using its 2.3 A peak output and 0.6–1.8 Ω internal RDSON. For optimal ringing suppression, a 5 Ω external series gate resistor is recommended with typical 2–5 nF gate capacitance loads. No level shifter, bootstrap diode, or auxiliary supply is required due to its integrated isolated VDD2 domain.