Analog Devices Inc. ADUM251N1BRIZ

Overview

ADUM251N1BRIZ from Analog Devices is a 5-channel, 5.0 kV_RMS digital isolator based on iCoupler® monolithic air-core transformer technology. It provides bidirectional signal isolation with 150 Mbps guaranteed data rate, 13 ns max propagation delay at 5 V, and 1.8 V to 5.5 V dual-supply operation for level translation-used in SPI bus isolation between microcontrollers and isolated ADCs or DACs.

For engineers reviewing the ADUM251N1BRIZ datasheet, ADUM251N1BRIZ pinout, ADUM251N1BRIZ application, or ADUM251N1BRIZ equivalent, key selection criteria include channel directionality (3 forward + 2 reverse), fail-safe high/low output configuration, reinforced insulation compliance (VDE V 0884-10, UL 1577), and 100 kV/μs common-mode transient immunity in industrial noise environments.

Technical Context

The ADUM251N1BRIZ implements five independent CMOS-isolated channels using integrated air-core transformers-enabling dc-correct output states without input transitions. Its functional block diagram confirms three channels (A–C) are input-to-output (forward), while two channels (D–E) are output-to-input (reverse), supporting full-duplex SPI communication across the isolation barrier.

This architecture delivers tight channel-to-channel propagation delay matching (≤4.0 ns codirectional skew) and low jitter (70 ps rms at 5 V), with independent supply domains (VDD1/VDD2) allowing 1.7–5.5 V operation per side and built-in undervoltage lockout (1.6 V threshold) for robust power sequencing.

Key Specifications

Pinout & Package

ADUM251N1BRIZ uses a 16-lead, RoHS-compliant, wide-body SOIC_IC package (RI-16) with 8.3 mm creepage and clearance, optimized for reinforced insulation in high-voltage applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel digital isolator applications.

Compared with SI8651ED-B-IS and ISO6751QDWR, ADUM251N1BRIZ offers superior propagation delay matching (≤4.0 ns vs. ≥6 ns) and configurable fail-safe outputs-critical for deterministic SPI timing and safety shutdown in industrial motion control.

Availability

ADUM251N1BRIZ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and energy metering applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADUM251N1BRIZ 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 ADuM25xxN series belongs to Analog Devices' iCoupler® digital isolator product line, designed specifically for high-reliability, high-speed galvanic isolation in industrial, medical, and energy infrastructure systems demanding reinforced insulation and low-latency signal transfer.

FAQ

What is the channel direction configuration of ADUM251N1BRIZ?

ADUM251N1BRIZ has three forward channels (input-to-output) and two reverse channels (output-to-input), enabling full-duplex SPI isolation. This matches the functional block diagram in the datasheet (Figure 2), where channels A–C are unidirectional input-to-output and D–E are unidirectional output-to-input-distinct from ADUM250N (5 forward) and ADUM252N (2 forward, 3 reverse). The "N1" suffix denotes the specific fail-safe configuration.

Does ADUM251N1BRIZ support 1.8 V operation on both sides simultaneously?

Yes, ADUM251N1BRIZ operates with VDD1 and VDD2 independently set from 1.7 V to 5.5 V, including simultaneous 1.8 V operation on both sides. At 1.8 V, it guarantees 150 Mbps data rate with ≤15 ns propagation delay and maintains 100 kV/μs common-mode transient immunity-verified in Table 7 of the Rev. A datasheet.

What safety certifications apply to ADUM251N1BRIZ?

ADUM251N1BRIZ holds pending certifications for UL 1577 (5000 V_RMS), CSA Component Acceptance Notice 5A, VDE V 0884-10 (VIORM = 849 V_PEAK), and CQC GB4943.1-2011. It is rated for reinforced insulation and 2 MOPP per IEC 60601-1 Ed.3, with 8.3 mm creepage/clearance meeting DIN VDE 0110 pollution degree 2 requirements.

How does the fail-safe feature work on ADUM251N1BRIZ?

The ADUM251N1BRIZ "N1" variant configures outputs to default to a logic high state when either VDD1 or VDD2 supply is absent or drops below UVLO threshold (1.5 V). This behavior is hardwired per the N1 ordering option and eliminates undefined states during power-up/power-down sequences-critical for preventing spurious actuator activation in safety systems.

What is the maximum junction temperature and thermal resistance of ADUM251N1BRIZ?

ADUM251N1BRIZ has a maximum junction temperature (T_J) of 150°C and a junction-to-ambient thermal resistance (θ_JA) of 45°C/W, measured with thermocouple at package center underside. Its total power dissipation limit is 2.78 W at 25°C ambient, derating linearly above that per the thermal derating curve in Figure 4 of the datasheet.