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Home > Products > Isolators > Digital Isolators

Analog Devices Inc. AD261AND-2

Name: AD261AND-2
Brand: Analog Devices Inc.
SKU: AD261AND-2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD261AND-2

Manufacturer:: Analog Devices Inc.

Category:: Digital Isolators

Package:: 22-DIP Module

Datasheet:: AD261AND-2.pdf

Description:: DGTL ISO 1.75KV GEN PURP 22DIP

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Product details

Overview

AD261AND-2 from Analog Devices is a high-speed logic isolator with 2 input / 3 output unidirectional channel configuration, 20 MHz minimum signal bandwidth, 14 ns propagation delay, and 3.5 kV_rms isolation rating (B-grade), designed for field-to-system digital signal isolation in PLC analog I/O cards and motor drive controls.

For engineers reviewing the AD261AND-2 datasheet, AD261AND-2 pinout, AD261AND-2 application, or AD261AND-2 equivalent, this device supports fast PWM signal isolation, offers dual enable-controlled three-state outputs on both sides, maintains ±1 ns edge symmetry, and operates across –25°C to +85°C with HCMOS-compatible thresholds and <10 pF barrier capacitance.

Technical Context

The AD261AND-2 implements five isolated logic channels using capacitive coupling across a 3.5 kV_rms tested barrier, with each channel featuring a Schmidt trigger input and transparent latch-based output stage. Its continuous update circuit ensures output validity within 12 µs after power-up reset or fault recovery.

It supports independent three-state control via ENABLESYS (pins 6) and ENABLEFLD (pin 17), allowing system-side and field-side outputs to be disabled separately. All inputs are HCMOS-compatible with 0.9–4.2 V threshold range and ≥0.4 V hysteresis, enabling noise-immune operation in industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	3.5 kV_rms test voltage (B-grade); enables safe interface between 750 V mains-referenced field circuits and low-voltage system logic.
Signal Bandwidth	20 MHz minimum; supports accurate isolation of fast digital signals including 50% duty-cycle square waves up to 20 MHz.
Propagation Delay	14 ns typical; ensures minimal timing skew in real-time control loops such as IGBT gate drive sequencing.
Edge Symmetry Error	±1 ns max (t_PHL vs t_PLH); preserves PWM duty cycle fidelity critical for motor current regulation.
Common-Mode Transient Immunity	10 kV/µs minimum; prevents false triggering during high-dv/dt events in motor drives or relay switching.
Supply Voltage Range	4.0 V to 5.75 V per side; accommodates brown-out conditions while maintaining full logic functionality.
Operating Temperature	–25°C to +85°C rated performance; suitable for industrial enclosures without active thermal management.

Pinout & Package

AD261AND-2 is housed in a 22-pin plastic DIP package (ND-22A) with 18 mm creepage distance between system and field sides, supporting CSA/IS and IEC 60950-compliant 750 V mains isolation.

Pin/Terminal	Circuit Role	Design Meaning
1–2, 18–20	S0, S1 (System Inputs); F0–F2 (Field Outputs)	Two unidirectional system-side inputs drive three field-side outputs; direction fixed per model - no bidirectional arbitration required.
6	ENABLESYS	Active-high enable controlling all system-side outputs (S0–S4); when low, forces high-impedance state for multiplexing multiple AD261s.
7, 8	+5 V_dcSYS, 5 V RTN_SYS	Dedicated 5 V supply pair for system-side logic; requires local 0.01 µF bypass capacitor per supply pin.
15, 16	5 V RTN_FLD, +5 V_dcFLD	Isolated 5 V supply pair for field-side logic; galvanically separated from system supply to break ground loops.
17	ENABLEFLD	Active-high enable controlling all field-side outputs (F0–F4); allows safe power-up presetting using pull-up/down resistors.

Key Features

Feature	Design Value
Five-channel capacitive isolation	Replaces up to five optocouplers with lower power, higher speed, and no LED aging or CTR degradation.
Dual independent three-state enables	Enables dynamic bus sharing and safe hot-plug operation by disabling outputs on either side without affecting the other.
Continuous output update	Maintains valid output states during static input conditions or after faults - guarantees correct level within 12 µs.
HCMOS-compatible thresholds	VT+ = 2.0–4.2 V and VT– = 0.9–3.0 V with ≥0.4 V hysteresis; eliminates need for external level-shifting in 5 V systems.
UL1950 / IEC950 / EN60950 certified	Meets international safety standards for reinforced insulation; simplifies end-equipment certification for industrial PLCs.

Applications

PLC Analog Input Card	IGBT Motor Drive Control
Use Scenario: Isolating digital control lines between microcontroller and ADC/DAC interface on field-side analog input modules. IC Role / Device Role / Timing Role: Unidirectional 2-input/3-output logic isolator transmitting channel select, conversion start, and data ready signals across isolation barrier. Use Value: Enables precise timing alignment of sampling clocks and avoids ground-loop-induced offset errors in precision measurement circuits.	Use Scenario: Transmitting PWM gate drive enable and fault feedback signals between controller board and high-voltage IGBT driver stage. IC Role / Device Role / Timing Role: High-fidelity isolator preserving 20 MHz PWM edges and ±1 ns symmetry for accurate duty cycle replication. Use Value: Prevents shoot-through and overcurrent by ensuring synchronized, jitter-free gate control under fast transient conditions.
Industrial Communications Bus	High-Speed Digital I/O Port
Use Scenario: Isolating RS-485 transceiver control lines (DE/RE) and status flags in factory automation networks. IC Role / Device Role / Timing Role: Bidirectionally configured logic isolator (via pin assignment) handling enable/disable and fault reporting across bus segments. Use Value: Eliminates bus lockup during ESD events by maintaining signal integrity at 10 kV/µs common-mode transients.	Use Scenario: Providing isolated digital I/O expansion for embedded controllers interfacing with sensors, actuators, and relays. IC Role / Device Role / Timing Role: Configurable 2-in/3-out isolator routing control commands and status returns across safety-critical boundaries. Use Value: Supports hot-swap capability and modular design through independent ENABLESYS/ENABLEFLD three-state control.

PLC Analog Input Card

IGBT Motor Drive Control

Use Scenario: Isolating digital control lines between microcontroller and ADC/DAC interface on field-side analog input modules.

IC Role / Device Role / Timing Role: Unidirectional 2-input/3-output logic isolator transmitting channel select, conversion start, and data ready signals across isolation barrier.

Use Value: Enables precise timing alignment of sampling clocks and avoids ground-loop-induced offset errors in precision measurement circuits.

Use Scenario: Transmitting PWM gate drive enable and fault feedback signals between controller board and high-voltage IGBT driver stage.

IC Role / Device Role / Timing Role: High-fidelity isolator preserving 20 MHz PWM edges and ±1 ns symmetry for accurate duty cycle replication.

Use Value: Prevents shoot-through and overcurrent by ensuring synchronized, jitter-free gate control under fast transient conditions.

Industrial Communications Bus

High-Speed Digital I/O Port

Use Scenario: Isolating RS-485 transceiver control lines (DE/RE) and status flags in factory automation networks.

IC Role / Device Role / Timing Role: Bidirectionally configured logic isolator (via pin assignment) handling enable/disable and fault reporting across bus segments.

Use Value: Eliminates bus lockup during ESD events by maintaining signal integrity at 10 kV/µs common-mode transients.

Use Scenario: Providing isolated digital I/O expansion for embedded controllers interfacing with sensors, actuators, and relays.

IC Role / Device Role / Timing Role: Configurable 2-in/3-out isolator routing control commands and status returns across safety-critical boundaries.

Use Value: Supports hot-swap capability and modular design through independent ENABLESYS/ENABLEFLD three-state control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed logic isolation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM1402ARWZ	4-channel, 50 Mbps, 2.5 kV_rms isolation; uses iCoupler® magnetic coupling; no enable pins; different pinout.	Lacks dual enable control and 3.5 kV_rms rating; unsuitable where UL/IEC 60950 compliance at 3.5 kV is mandated.	Prefer AD261AND-2 when field/system-side three-state control and 3.5 kV_rms certification are required.
SI8622ED-B-IS	2-channel, 150 Mbps, 5 kV_rms; CMOS-based capacitive isolation; single supply; no dedicated field/system enable pins.	Higher isolation rating but only two channels; lacks separate field/system enable architecture for multiplexed bus control.	Choose AD261AND-2 for 2-in/3-out topology with independent enable control and proven industrial temperature stability.

Compared with ADUM1402ARWZ and SI8622ED-B-IS, the AD261AND-2 uniquely delivers 2-input/3-output channel mapping, dual independent enable pins, 3.5 kV_rms production-tested isolation, and guaranteed ±1 ns edge symmetry - making it optimal for certified industrial I/O and motor control designs requiring deterministic timing and safety compliance.

Availability

AD261AND-2 is available at Aetrix Electronics and suitable for PLC analog input cards, IGBT motor drive controls, and industrial communications bus isolation requiring stable component supply, long-term lifecycle support, and certified safety ratings.

Supply support for AD261AND-2 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 AD261 series was developed specifically for high-speed, safety-certified digital isolation in industrial automation, offering superior transient immunity and deterministic timing versus optocouplers.

FAQ

What is the isolation voltage rating of the AD261AND-2?

The AD261AND-2 is a B-grade device with a 3.5 kV_rms isolation test voltage rating and a 1.25 kV_rms operating isolation voltage. It is 100% production-tested to 3.5 kV_rms using Analog Devices' standard test method, and certified to UL1950, IEC950, and EN60950 standards.

How does the AD261AND-2 handle power-up and fault recovery?

The AD261AND-2 enters a power-up reset mode for ~30 µs after either supply crosses 3.3 V, during which all outputs are disabled. Its continuous update circuit then ensures outputs reflect true input states within 12 µs after reset or fault recovery - guaranteeing deterministic behavior without external supervision.

Can the AD261AND-2 isolate PWM signals accurately?

Yes - the AD261AND-2 maintains waveform edge transmission symmetry within ±1 ns and has only 14 ns propagation delay. This preserves PWM duty cycle fidelity and enables accurate isolation of time-critical signals used in motor control and power regulation applications.

What are the supply requirements for the AD261AND-2?

The AD261AND-2 requires two independent 5 V supplies: +5 V_dcSYS/5 V RTN_SYS for the system side and +5 V_dcFLD/5 V RTN_FLD for the field side. Each supply must be bypassed with a 0.01 µF capacitor near the respective pins, and the device operates across 4.0 V to 5.75 V per side.

Does the AD261AND-2 support bidirectional communication?

No - the AD261AND-2 is strictly unidirectional: pins 1–2 (S0, S1) are system-side inputs, and pins 18–20 (F0–F2) are field-side outputs. Directionality is fixed per model; bidirectional operation requires separate transmit/receive channels or alternate configurations like AD261AND-3.

AD261AND-2 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: IsoLogic™

Package/Case:: 22-DIP Module

Packaging:: Tube

Product Status:: Obsolete

Technology:: Magnetic Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 5

Inputs - Side 1/Side 2:: 2/3

Channel Type:: Unidirectional

Voltage - Isolation:: 1750Vrms

Common Mode Transient Immunity (Min):: 10kV/µs

Data Rate:: -

Propagation Delay tpLH / tpHL (Max):: 25ns, 25ns

Pulse Width Distortion (Max):: -

Rise / Fall Time (Typ):: -

Voltage - Supply:: 4V ~ 5.75V

Grade:: -

Qualification:: -

Operating Temperature:: -25°C ~ 85°C

Mounting Type:: Through Hole

Supplier Device Package:: 22-PDIP

AD261AND-2 FAQ

1.How can I place an order for AD261AND-2 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD261AND-2 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 AD261AND-2 reliable?

The price and inventory of AD261AND-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD261AND-2 is usually 5 days.

3.What payment methods are accepted for AD261AND-2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD261AND-2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD261AND-2?

AD261AND-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD261AND-2 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 AD261AND-2?

For technical support, including AD261AND-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD261AND-2 requirements.

6.How does Aetrix verify that AD261AND-2 is sourced from the original manufacturer or authorized distributors?

All AD261AND-2 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 AD261AND-2 meets industry standards.

7.What is the process for return or replacement of AD261AND-2?

All AD261AND-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD261AND-2, 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 AD261AND-2 part is unused and in its original packaging.

Return procedure for AD261AND-2:

1.Submit a request within 90 days.

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

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