Analog Devices Inc. ADUM1246ARSZ

Overview

ADUM1246ARSZ from Analog Devices is a micropower, dual-channel digital isolator based on iCoupler® technology, providing reinforced 3750 V_rms isolation in a 20-lead SSOP package. It supports bidirectional NRZ communication up to 2 Mbps, operates from 2.25 V to 3.6 V supplies, and delivers ultralow quiescent current (0.3 μA/channel with refresh disabled) for battery-powered or thermally constrained industrial interfaces.

For engineers reviewing the ADUM1246ARSZ datasheet, ADUM1246ARSZ pinout, ADUM1246ARSZ application, or ADUM1246ARSZ equivalent, this page provides verified functional block mapping, side-specific supply current behavior under 2.5 V/3.3 V asymmetrical operation, propagation delay skew limits, and safety-certified insulation parameters aligned with UL 1577 and VDE V 0884-10.

Technical Context

The ADUM1246ARSZ implements two independent CMOS-to-air-core-transformer signal channels with integrated input/output refresh control via EN1 and EN2 pins. Its architecture enables deterministic low-power operation: when ENx = 1 (high), internal refresh is disabled, reducing per-channel quiescent current to ≤0.13 μA at 3.3 V; when ENx = 0 (low), refresh is enabled and current rises to ≤10 μA per channel.

It supports asymmetric supply configurations (e.g., VDD1 = 3.3 V / VDD2 = 2.5 V), with side-specific DC thresholds (VIH = 0.7×VDDx), output drive capability (±4 mA), and guaranteed pulse width distortion <12 ns across −40°C to +125°C. Input hysteresis (ΔVT = 0.5–0.6 V) and an input glitch filter provide noise immunity in noisy industrial environments.

Key Specifications

Pinout & Package

ADUM1246ARSZ is packaged in a 20-lead SSOP (RS-20) with 0.65 mm pitch, 5.1 mm minimum PCB creepage/clearance, and reinforced insulation rated to 849 V_PEAK.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel digital isolator applications.

Compared with ADUM1240ARSZ, ADUM1246ARSZ provides intentional channel inversion on A-side for direct interface with complementary logic, while SI8620ED-IS trades regulatory certification and pin-level power control for lower unit cost and smaller footprint - making ADUM1246ARSZ the sole choice for certified, configurable, high-isolation dual-channel isolation.

Availability

ADUM1246ARSZ is available at Aetrix Electronics and suitable for industrial process control, motor drive feedback interfaces, precision SPI isolation, and low-power sensor node designs requiring stable component supply and long-term lifecycle support.

Supply support for ADUM1246ARSZ 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 ADuM124x family is part of Analog Devices' iCoupler® digital isolator product line, engineered specifically for ultra-low-power, high-reliability galvanic isolation in harsh industrial, medical, and energy infrastructure applications.

FAQ

What is the isolation rating of the ADUM1246ARSZ and which safety standards does it meet?

The ADUM1246ARSZ provides 3750 V_rms isolation for 1 minute per UL 1577 and is certified to DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 for reinforced insulation with VIORM = 849 V_PEAK. It also carries CSA Component Acceptance Notice 5A approval. These ratings are validated for the 20-lead SSOP package variant and apply across the full −40°C to +125°C operating temperature range. The ADUM1246ARSZ meets all requirements for reinforced insulation in industrial equipment operating up to 400 V_rms mains voltage.

How does the EN1 and EN2 pin configuration affect power consumption in ADUM1246ARSZ?

In ADUM1246ARSZ, tying EN1 and EN2 to VDD1 disables internal refresh and watchdog functions, reducing quiescent current to ≤0.13 μA per channel at 3.3 V. Tying both to GND1 enables refresh, increasing current to ≤10 μA per channel. EN1 and EN2 must be set to identical logic states; mismatched states cause undefined behavior. This dual-pin control allows system-level optimization - for example, disabling refresh during deep sleep while enabling it during active communication phases.

Can ADUM1246ARSZ operate with different supply voltages on each side, and what are the limits?

Yes, ADUM1246ARSZ supports asymmetric supply operation: VDD1 and VDD2 may differ, with valid ranges of 2.25 V to 3.6 V each. Tested configurations include VDD1 = 3.3 V / VDD2 = 2.5 V and VDD1 = 2.5 V / VDD2 = 3.3 V. In such cases, DC specifications (VIH, VIL, VOH, VOL) scale with their respective supply rails, and propagation delay asymmetry is characterized - e.g., side-1-to-side-2 delay is 84–180 ns, while side-2-to-side-1 is 120–180 ns under VDD1 = 3.3 V / VDD2 = 2.5 V conditions.

What is the maximum data rate supported by ADUM1246ARSZ and how is timing performance specified?

ADUM1246ARSZ supports up to 2 Mbps NRZ data rate with guaranteed pulse width distortion ≤12 ns and codirectional propagation delay skew ≤10 ns across −40°C to +125°C. Propagation delay (tPHL/tPLH) is 80–180 ns at 3.3 V and 112–180 ns at 2.5 V. Minimum pulse width is 500 ns, and output rise/fall times are ≤2 ns (10% to 90%). These parameters ensure reliable operation in 1 MHz SPI interfaces and isolated PWM feedback paths without added timing margin overhead.

Does ADUM1246ARSZ include any built-in protection features against electrical noise or supply faults?

Yes, ADUM1246ARSZ integrates multiple hardware-level protections: an input glitch filter rejects short-duration noise spikes on VIA/VIB; side-specific undervoltage lockout (UVLO = 1.5 V) forces outputs to a known state during brownout; and absolute maximum ratings include ±100 kV/μs common-mode transient tolerance. Additionally, each channel has input hysteresis (ΔVT = 0.5–0.6 V) to prevent chatter near logic thresholds. These features collectively ensure robust operation in electrically noisy environments like factory automation and motor drives without external RC filtering.