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Home > Products > Isolators > Digital Isolators

Analog Devices Inc. ADUM1280CRZ

Name: ADUM1280CRZ
Brand: Analog Devices Inc.
SKU: ADUM1280CRZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADUM1280CRZ

Manufacturer:: Analog Devices Inc.

Category:: Digital Isolators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ADUM1280CRZ.pdf

Description:: DGTL ISO 3000VRMS 2CH GP 8SOIC

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Product details

Overview

ADUM1280CRZ from Analog Devices is a 3 kV_RMS dual-channel digital isolator based on iCoupler® transformer technology, providing bidirectional signal isolation with default-high output logic state. It supports up to 100 Mbps NRZ data rate, exhibits 23 ns typical propagation delay, and operates across 3.135 V–5.5 V supply rails on both sides for level translation-used in industrial field bus interfaces and battery monitor systems requiring reinforced insulation.

For engineers reviewing the ADUM1280CRZ datasheet, ADUM1280CRZ pinout, ADUM1280CRZ application, or ADUM1280CRZ equivalent, key selection criteria include its 3000 V_RMS isolation rating, 25 kV/μs common-mode transient immunity, C-grade timing performance (≤2 ns pulse width distortion), and narrow-body SOIC-8 package with reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17).

Technical Context

The ADUM1280CRZ implements two independent galvanic isolation channels using monolithic air-core transformers, enabling dc-correct signal transmission without optical components. Its patented refresh circuit maintains output state during input inactivity, eliminating optocoupler-style signal decay.

It supports mixed-voltage operation (e.g., 5 V side 1 / 3.3 V side 2), delivers ≤2 ns pulse width distortion at C grade, and achieves tight channel-to-channel matching of 2 ns codirectional skew-critical for time-sensitive serial interfaces like SPI and isolated ADC control.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	Up to 100 Mbps NRZ - supports high-speed SPI, RS-485, and CAN FD interface isolation without oversampling.
Propagation Delay	23 ns typical - enables sub-50 ns round-trip latency in closed-loop motor control feedback paths.
Pulse Width Distortion	≤2 ns (C grade) - preserves duty cycle integrity for PWM gate drive signals and clock forwarding.
Common-Mode Transient Immunity	>25 kV/μs - sustains reliable operation in noisy motor drive and power converter environments.
Isolation Rating	3000 V_RMS for 1 minute - meets reinforced insulation requirements per UL 1577 and IEC/EN/CSA 62368-1.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions.
Supply Voltage Range	3.135 V to 5.5 V per side - enables 3.3 V ↔ 5 V level translation across isolation barrier.

Pinout & Package

Narrow-body, RoHS-compliant 8-lead SOIC package (SOIC_N-8) with creepage/clearance ≥4.0 mm and internal insulation gap ≥18 μm per DIN EN IEC 60747-17.

Pin/Terminal	Circuit Role	Design Meaning
1 - VDD1	Input-side power supply	Supplies side 1 logic (inputs VIA/VIB); accepts 3.135–5.5 V; includes undervoltage lockout (2.75 V threshold).
2 - VIA	Input A	CMOS-compatible logic input referenced to VDD1/GND1; drives isolated output VOA.
3 - VIB	Input B	CMOS-compatible logic input referenced to VDD1/GND1; drives isolated output VOB.
4 - GND1	Input-side ground	Reference return for side 1 inputs and VDD1; must be separated from GND2 by ≥4 mm PCB clearance.
5 - GND2	Output-side ground	Reference return for side 2 outputs and VDD2; galvanically isolated from GND1.
6 - VOB	Output B	CMOS output referenced to VDD2/GND2; default-high when unpowered; sinks/sourses ±10 mA.
7 - VOA	Output A	CMOS output referenced to VDD2/GND2; default-high when unpowered; matches VOB timing within 2 ns.
8 - VDD2	Output-side power supply	Supplies side 2 logic (outputs VOA/VOB); accepts 3.135–5.5 V; independent of VDD1.

Key Features

Feature	Design Value
Default-high output state	Ensures fail-safe logic high on VOA/VOB during side-1 power loss-critical for enabling safety interlocks in motor drives.
Patented dc-correct refresh	Maintains output state indefinitely without input toggling-eliminates need for external watchdog timers in static control lines.
Reinforced insulation certification	DIN EN IEC 60747-17 (VDE 0884-17) approval with VIORM = 565 V_PEAK-supports functional safety architectures up to SIL 3.
High-temperature operation	125°C ambient rating with thermal derating per DIN EN IEC 60747-17-enables placement near power stages without heatsinking.
Low dynamic power	0.09 mA/Mbps input + 0.04 mA/Mbps output current-reduces thermal load in dense isolation clusters.

Applications

Industrial Field Bus Isolation	Data Converter Interface
Use Scenario: Isolating RS-485 transceivers in PLC backplanes exposed to ground potential differences up to 1 kV. IC Role / Device Role / Timing Role: Dual-channel isolator separating controller-side UART signals from bus-side differential drivers while preserving full-duplex timing. Use Value: Prevents ground loop currents and enables 25 kV/μs transient suppression-maintaining communication integrity during ESD events and lightning surges.	Use Scenario: Isolating SPI clock and data lines between microcontroller and isolated Σ-Δ ADC in energy metering systems. IC Role / Device Role / Timing Role: Providing matched-propagation-delay isolation for SCLK, MOSI, and MISO to avoid setup/hold violations at 20 MHz. Use Value: Achieves ≤2 ns channel skew and 23 ns delay-enabling accurate phase-aligned sampling without additional timing compensation.
Hybrid Electric Vehicle Battery Monitor	Motor Drive Gate Control
Use Scenario: Isolating cell voltage measurement data from high-voltage battery packs (up to 800 VDC) to low-voltage MCU domains. IC Role / Device Role / Timing Role: Transmitting daisy-chained ADC results across reinforced insulation barrier with default-high fault signaling. Use Value: VIORM = 565 V_PEAK and 3000 V_RMS withstand support ASIL-B compliance; refresh feature ensures valid data during sleep modes.	Use Scenario: Isolating PWM signals from gate driver ICs controlling IGBTs in 3-phase inverters subject to fast dv/dt transients. IC Role / Device Role / Timing Role: Delivering synchronized, low-skew gate enable/disable signals to upper/lower half-bridge drivers. Use Value: 25 kV/μs CMTI rating prevents false triggering during 10 kV/μs switching noise; 100 Mbps capability supports >200 kHz PWM frequencies.

Industrial Field Bus Isolation

Data Converter Interface

Use Scenario: Isolating RS-485 transceivers in PLC backplanes exposed to ground potential differences up to 1 kV.

IC Role / Device Role / Timing Role: Dual-channel isolator separating controller-side UART signals from bus-side differential drivers while preserving full-duplex timing.

Use Value: Prevents ground loop currents and enables 25 kV/μs transient suppression-maintaining communication integrity during ESD events and lightning surges.

Use Scenario: Isolating SPI clock and data lines between microcontroller and isolated Σ-Δ ADC in energy metering systems.

IC Role / Device Role / Timing Role: Providing matched-propagation-delay isolation for SCLK, MOSI, and MISO to avoid setup/hold violations at 20 MHz.

Use Value: Achieves ≤2 ns channel skew and 23 ns delay-enabling accurate phase-aligned sampling without additional timing compensation.

Hybrid Electric Vehicle Battery Monitor

Motor Drive Gate Control

Use Scenario: Isolating cell voltage measurement data from high-voltage battery packs (up to 800 VDC) to low-voltage MCU domains.

IC Role / Device Role / Timing Role: Transmitting daisy-chained ADC results across reinforced insulation barrier with default-high fault signaling.

Use Value: VIORM = 565 V_PEAK and 3000 V_RMS withstand support ASIL-B compliance; refresh feature ensures valid data during sleep modes.

Use Scenario: Isolating PWM signals from gate driver ICs controlling IGBTs in 3-phase inverters subject to fast dv/dt transients.

IC Role / Device Role / Timing Role: Delivering synchronized, low-skew gate enable/disable signals to upper/lower half-bridge drivers.

Use Value: 25 kV/μs CMTI rating prevents false triggering during 10 kV/μs switching noise; 100 Mbps capability supports >200 kHz PWM frequencies.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SI8620ED-B-IS	Capacitive isolation; 5000 V_RMS rating; 150 Mbps max; no default output state.	Lacks default-high behavior-requires external pull-up for fail-safe startup; higher CMTI (35 kV/μs) but no AEC-Q100 qualification.	Prefer for ultra-high-noise environments where CMTI >30 kV/μs is mandatory and default state is managed externally.
ISO7721D	Capacitive isolation; 5000 V_RMS; 100 Mbps; default-low output; no AEC-Q100.	Default-low contradicts ADUM1280CRZ's fail-safe high assertion; lower propagation delay (11 ns) but reduced temperature range (−40°C to +105°C).	Select only if system requires lowest possible latency and default-low assertion aligns with safety architecture.

Compared with SI8620ED-B-IS and ISO7721D, ADUM1280CRZ provides guaranteed default-high output for safety-critical startup, AEC-Q100 qualification for automotive use, and tighter channel matching (2 ns vs. ≥3 ns), making it optimal for motor control and battery monitoring where deterministic initial state and timing coherence are essential.

Availability

ADUM1280CRZ is available at Aetrix Electronics and suitable for industrial field bus isolation, battery monitor systems, and motor drive gate control requiring stable component supply across extended temperature and regulatory-compliant designs.

Supply support for ADUM1280CRZ 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 precision instrumentation, industrial automation, and automotive markets.

The ADuM1280CRZ belongs to the iCoupler® digital isolator product line, engineered specifically for high-reliability galvanic isolation in harsh electromagnetic environments-targeting applications demanding reinforced insulation, high CMTI, and fail-safe default states.

FAQ

What is the default output state of ADUM1280CRZ?

The ADUM1280CRZ features a default-high output state: when VDD1 is unpowered or absent, both VOA and VOB assert logic high. This behavior is confirmed in the truth tables for ADUM1280 and ADUM1285 in the datasheet and supports fail-safe operation in safety-critical systems such as motor enable circuits. The ADUM1280CRZ maintains this default state until valid input transitions occur after VDD1 power restoration.

Does ADUM1280CRZ support level translation between 3.3 V and 5 V domains?

Yes, ADUM1280CRZ supports true bidirectional level translation: VDD1 may operate from 3.135 V to 5.5 V independently of VDD2, which also ranges from 3.135 V to 5.5 V. Mixed-supply configurations-including 5 V on side 1 with 3.3 V on side 2-are fully characterized in Tables 7 and 10 of the datasheet, with verified timing and drive strength across all combinations. This enables direct interfacing between legacy 5 V controllers and modern 3.3 V peripherals without external level shifters.

What safety certifications does ADUM1280CRZ hold?

ADUM1280CRZ is certified to UL 1577 (3000 V_RMS, 1 min), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. Its VIORM = 565 V_PEAK and working voltage rating of 400 V_RMS meet requirements for basic and reinforced insulation in industrial and automotive applications. The "*" marking on the package denotes VDE 0884-17 compliance.

How does ADUM1280CRZ maintain dc correctness without input toggling?

ADUM1280CRZ uses a patented internal refresh circuit that periodically samples and retransmits the last valid input state across the isolation barrier-even when inputs remain static. This ensures outputs retain correct logic levels indefinitely, unlike optocouplers that drift or require minimum data rates. The refresh period is fixed at 1.6 µs, as specified in Table 3, Table 6, Table 9, and Table 12 of the datasheet.

Is ADUM1280CRZ qualified for automotive applications?

Yes, ADUM1280CRZ is AEC-Q100 qualified for automotive applications (Grade 1: −40°C to +125°C). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD-ensuring reliability in under-hood and battery management systems. The datasheet explicitly lists "AEC-Q100 qualified for automotive applications" in the FEATURES section and confirms operating temperature compliance in Table 17.

ADUM1280CRZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: iCoupler®

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Technology:: Magnetic Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 2

Inputs - Side 1/Side 2:: 2/0

Channel Type:: Unidirectional

Voltage - Isolation:: 3000Vrms

Common Mode Transient Immunity (Min):: 25kV/µs

Data Rate:: 100Mbps

Propagation Delay tpLH / tpHL (Max):: 24ns, 24ns

Pulse Width Distortion (Max):: 2ns

Rise / Fall Time (Typ):: 2.5ns, 2.5ns

Voltage - Supply:: 3V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

ADUM1280CRZ FAQ

1.How can I place an order for ADUM1280CRZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ADUM1280CRZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADUM1280CRZ reliable?

The price and inventory of ADUM1280CRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1280CRZ is usually 5 days.

3.What payment methods are accepted for ADUM1280CRZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1280CRZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADUM1280CRZ?

ADUM1280CRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADUM1280CRZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADUM1280CRZ?

For technical support, including ADUM1280CRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1280CRZ requirements.

6.How does Aetrix verify that ADUM1280CRZ is sourced from the original manufacturer or authorized distributors?

All ADUM1280CRZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADUM1280CRZ meets industry standards.

7.What is the process for return or replacement of ADUM1280CRZ?

All ADUM1280CRZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1280CRZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADUM1280CRZ part is unused and in its original packaging.

Return procedure for ADUM1280CRZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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