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Home > Products > Isolators > Digital Isolators

Analog Devices Inc. ADUM1240ARZ-RL7

Name: ADUM1240ARZ-RL7
Brand: Analog Devices Inc.
SKU: ADUM1240ARZ-RL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADUM1240ARZ-RL7

Manufacturer:: Analog Devices Inc.

Category:: Digital Isolators

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

Datasheet:: ADUM1240ARZ-RL7.pdf

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

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Product details

Overview

ADUM1240ARZ-RL7 from Analog Devices is a micropower, dual-channel, bidirectional digital isolator based on iCoupler® transformer technology, delivering 2 Mbps NRZ data rate, <8 ns pulse width distortion, and 3000 V_rms reinforced isolation in an 8-lead SOIC package. It operates from 2.25 V to 3.6 V supplies and supports low-power industrial serial interfaces including SPI and 4 mA–20 mA loop control.

For engineers reviewing the ADUM1240ARZ-RL7 datasheet, ADUM1240ARZ-RL7 pinout, ADUM1240ARZ-RL7 application, or ADUM1240ARZ-RL7 equivalent, key selection criteria include quiescent current (0.3 μA/channel refresh disabled), common-mode transient immunity (>25 kV/μs), thermal operation up to +125°C, and UL/VDE safety certification for 3000 V_rms isolation.

Technical Context

The ADUM1240ARZ-RL7 implements two independent, bidirectional CMOS-isolated channels using monolithic air-core transformers-no optocoupler LED aging or bias drift. Each channel features input hysteresis (ΔV_T = 0.6 V), undervoltage lockout (UVLO = 1.5 V), and glitch filtering for noise immunity.

It supports asymmetric supply operation (e.g., VDD1 = 3.3 V / VDD2 = 2.5 V), with propagation delay skew ≤10 ns (codirectional) and PWD ≤8 ns at 3.3 V. Refresh enable/disable pins are absent in the 8-lead SOIC variant-refresh is permanently enabled per its fixed internal architecture.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2 Mbps NRZ - supports full-speed SPI clocking and real-time sensor feedback loops without encoding overhead.
Isolation Rating	3000 V_rms for 1 minute (UL 1577) - meets basic insulation requirements for industrial I/O and PLC backplanes.
Pulse Width Distortion	<8 ns - ensures accurate timing alignment between isolated channels for synchronous protocols.
Quiescent Current	5.6 μA per channel at 3.3 V (refresh enabled) - enables battery-powered or energy-harvesting systems with multi-year runtime.
Common-Mode Transient Immunity	>25 kV/μs - sustains reliable operation in motor drives and power converters with fast-switching noise.
Supply Voltage Range	2.25 V to 3.6 V per side - interoperates with both 2.5 V logic and 3.3 V microcontrollers without level shifters.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor metering environments.

Pinout & Package

ADUM1240ARZ-RL7 is housed in an 8-lead SOIC (R-8) package with gull-wing leads, 1.27 mm pitch, and 4.5 mm minimum PCB clearance between input and output sides per VDE 0884-10.

Pin	Circuit Role	Design Meaning
1	VDD1	Side 1 supply (2.25–3.6 V); requires local 0.01–0.1 μF ceramic bypass to GND1.
2	VIA	Logic input A (Side 1); accepts CMOS levels referenced to VDD1.
3	VIB	Logic input B (Side 1); bidirectionally coupled to VOA/VOB via internal transformer core.
4	GND1	Side 1 ground reference; electrically isolated from GND2.
5	GND2	Side 2 ground reference; galvanically separated from GND1 for noise suppression.
6	VOB	Logic output B (Side 2); driven by VIB with <180 ns propagation delay.
7	VOA	Logic output A (Side 2); driven by VIA with matched channel timing.
8	VDD2	Side 2 supply (2.25–3.6 V); independent of VDD1 for level-shifting applications.

Key Features

Feature	Design Value
Ultralow power operation	5.6 μA/channel quiescent current at 3.3 V enables always-on isolation in IoT edge nodes.
Bidirectional communication	Full-duplex channel pairing eliminates need for separate TX/RX isolators in SPI bus isolation.
High CMTI	>25 kV/μs common-mode rejection prevents data corruption in high-noise motor drive gate driver circuits.
Input glitch filter	Integrated noise suppression rejects sub-100 ns transients-no external RC filtering required.
Thermal robustness	Rated for continuous operation at +125°C ambient-suitable for enclosed industrial enclosures without forced cooling.

Applications

Industrial SPI Isolation	4–20 mA Loop Interface
Use Scenario: Isolating SPI signals between a microcontroller and isolated ADC/DAC in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel bidirectional isolator preserving SCLK, MOSI, MISO, and CS timing integrity across isolation barrier. Use Value: Eliminates ground loop errors and enables safe hot-swap of field I/O modules while maintaining 2 Mbps throughput.	Use Scenario: Galvanic separation of 4–20 mA transmitter circuitry from host controller in process automation systems. IC Role / Device Role / Timing Role: Isolating digital control lines (enable, fault flag, calibration) between loop-powered sensor and system MCU. Use Value: Prevents ground potential differences from corrupting analog current loop accuracy; supports SIL-2 functional safety architectures.
Motor Drive Feedback	Energy Metering Interface
Use Scenario: Isolating encoder quadrature signals and fault status from high-voltage inverter stages in servo drives. IC Role / Device Role / Timing Role: Low-skew dual-channel isolator transmitting A/B phase and error flags with <10 ns inter-channel mismatch. Use Value: Maintains position resolution at high RPM while rejecting dv/dt noise from IGBT switching transients.	Use Scenario: Isolating metrology IC digital outputs (e.g., pulse train, UART) from mains-connected microcontroller in smart electricity meters. IC Role / Device Role / Timing Role: Providing reinforced 3000 V_rms barrier between measurement side and communication interface side. Use Value: Meets IEC 62053-21 and EN 50470-3 creepage/clearance requirements without additional isolation components.

Industrial SPI Isolation

4–20 mA Loop Interface

Use Scenario: Isolating SPI signals between a microcontroller and isolated ADC/DAC in programmable logic controllers.

IC Role / Device Role / Timing Role: Dual-channel bidirectional isolator preserving SCLK, MOSI, MISO, and CS timing integrity across isolation barrier.

Use Value: Eliminates ground loop errors and enables safe hot-swap of field I/O modules while maintaining 2 Mbps throughput.

Use Scenario: Galvanic separation of 4–20 mA transmitter circuitry from host controller in process automation systems.

IC Role / Device Role / Timing Role: Isolating digital control lines (enable, fault flag, calibration) between loop-powered sensor and system MCU.

Use Value: Prevents ground potential differences from corrupting analog current loop accuracy; supports SIL-2 functional safety architectures.

Motor Drive Feedback

Energy Metering Interface

Use Scenario: Isolating encoder quadrature signals and fault status from high-voltage inverter stages in servo drives.

IC Role / Device Role / Timing Role: Low-skew dual-channel isolator transmitting A/B phase and error flags with <10 ns inter-channel mismatch.

Use Value: Maintains position resolution at high RPM while rejecting dv/dt noise from IGBT switching transients.

Use Scenario: Isolating metrology IC digital outputs (e.g., pulse train, UART) from mains-connected microcontroller in smart electricity meters.

IC Role / Device Role / Timing Role: Providing reinforced 3000 V_rms barrier between measurement side and communication interface side.

Use Value: Meets IEC 62053-21 and EN 50470-3 creepage/clearance requirements without additional isolation components.

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	2.5 kV_rms isolation rating; higher 7.5 mA output drive; no input hysteresis.	Limited to lower-voltage industrial equipment; lacks built-in glitch filter for noisy environments.	Choose when higher output current is needed and CMTI >25 kV/μs is not required.
ISO6720DWR	5000 V_rms reinforced isolation; 50 Mbps max data rate; 1.65–5.5 V supply range.	Overqualified for 2 Mbps SPI but suitable for future-proofed designs requiring higher voltage margins.	Prefer when designing for long-term compliance with IEC 61800-5-1 or UL 61800-5-1 motor drive standards.

Compared with SI8620ED-B-IS and ISO6720DWR, the ADUM1240ARZ-RL7 delivers optimal balance of ultra-low power (5.6 μA/channel), certified 3000 V_rms isolation, and precise timing (<8 ns PWD) for cost-sensitive, thermally constrained industrial control nodes.

Availability

ADUM1240ARZ-RL7 is available at Aetrix Electronics and suitable for industrial PLCs, energy metering systems, and motor drive feedback circuits requiring stable component supply, long-lifecycle support, and UL/VDE-certified isolation performance.

Supply support for ADUM1240ARZ-RL7 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, with design centers worldwide.

The ADuM124x family was engineered specifically for low-power, space-constrained industrial isolation applications-emphasizing micropower operation, high CMTI, and regulatory-compliant reinforced insulation in compact SOIC and SSOP packages.

FAQ

What is the maximum data rate supported by the ADUM1240ARZ-RL7?

The ADUM1240ARZ-RL7 supports a maximum data rate of 2 Mbps in nonreturn-to-zero (NRZ) format. This is validated across the full operating temperature range (−40°C to +125°C) and supply range (2.25 V to 3.6 V), with pulse width distortion maintained below 8 ns to ensure signal integrity in timing-critical interfaces like SPI.

Does the ADUM1240ARZ-RL7 support asymmetric supply voltages?

Yes, the ADUM1240ARZ-RL7 supports asymmetric operation-for example, VDD1 = 3.3 V and VDD2 = 2.5 V. Electrical characteristics tables in the datasheet explicitly define propagation delay, supply current, and logic thresholds under these mixed-supply conditions, enabling direct interfacing between 3.3 V microcontrollers and 2.5 V sensors or ADCs without external level shifters.

What safety certifications does the ADUM1240ARZ-RL7 hold?

The ADUM1240ARZ-RL7 is certified to UL 1577 (3000 V_rms/1 min), CSA Component Acceptance Notice 5A, and VDE V 0884-10 (DIN V VDE V 0884-10:2006-12) for reinforced insulation. Its 8-lead SOIC package carries VIORM = 560 V_peak, meeting IEC 60950-1 and IEC 61000-4-5 surge immunity requirements for industrial end equipment.

How does the ADUM1240ARZ-RL7 achieve ultralow power consumption?

The ADUM1240ARZ-RL7 achieves ultralow power via iCoupler® transformer architecture-eliminating LED bias current-and optimized CMOS circuitry. At 3.3 V, it draws only 5.6 μA per channel with refresh enabled, and includes an input glitch filter that removes the need for external RC networks, further reducing system-level power and component count.

Is the ADUM1240ARZ-RL7 pin-compatible with other ADuM124x variants?

No-the ADUM1240ARZ-RL7 (8-lead SOIC) is not pin-compatible with the 20-lead SSOP variants (e.g., ADUM1240ARWZ). The SOIC version lacks EN1/EN2 pins and internal refresh disable functionality; those features exist only in the SSOP package. Pin mapping, footprint, and thermal characteristics differ significantly between packages.

ADUM1240ARZ-RL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: iCoupler®

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

Packaging:: Tape & Reel (TR)

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:: 2Mbps

Propagation Delay tpLH / tpHL (Max):: 180ns, 180ns

Pulse Width Distortion (Max):: 8ns

Rise / Fall Time (Typ):: 2ns, 2ns

Voltage - Supply:: 2.25V ~ 3.6V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

ADUM1240ARZ-RL7 FAQ

1.How can I place an order for ADUM1240ARZ-RL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ADUM1240ARZ-RL7 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 ADUM1240ARZ-RL7 reliable?

The price and inventory of ADUM1240ARZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1240ARZ-RL7 is usually 5 days.

3.What payment methods are accepted for ADUM1240ARZ-RL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1240ARZ-RL7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADUM1240ARZ-RL7?

ADUM1240ARZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADUM1240ARZ-RL7 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 ADUM1240ARZ-RL7?

For technical support, including ADUM1240ARZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1240ARZ-RL7 requirements.

6.How does Aetrix verify that ADUM1240ARZ-RL7 is sourced from the original manufacturer or authorized distributors?

All ADUM1240ARZ-RL7 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 ADUM1240ARZ-RL7 meets industry standards.

7.What is the process for return or replacement of ADUM1240ARZ-RL7?

All ADUM1240ARZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1240ARZ-RL7, 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 ADUM1240ARZ-RL7 part is unused and in its original packaging.

Return procedure for ADUM1240ARZ-RL7:

1.Submit a request within 90 days.

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

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