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Home > Products > Isolators > Digital Isolators

Analog Devices Inc. AD261AND-1

Name: AD261AND-1
Brand: Analog Devices Inc.
SKU: AD261AND-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD261AND-1

Manufacturer:: Analog Devices Inc.

Category:: Digital Isolators

Package:: 22-DIP Module

Datasheet:: AD261AND-1.pdf

Description:: DGTL ISO 1.75KV GEN PURP 22DIP

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Product details

Overview

AD261AND-1 from Analog Devices is a high-speed logic isolator with 1 input and 4 outputs across a galvanic isolation barrier, rated for 1.75 kV_rms operating isolation voltage. It delivers 20 MHz signal bandwidth, 14 ns propagation delay, and ±1 ns edge symmetry error, enabling accurate PWM and high-speed digital I/O isolation in industrial control systems.

For engineers reviewing the AD261AND-1 datasheet, AD261AND-1 pinout, AD261AND-1 application, or AD261AND-1 equivalent, this device supports fast, noise-immune bidirectional field-to-system communication in PLC analog I/O cards, motor drive controls, and data acquisition systems where precise timing and transient resilience are critical.

Technical Context

The AD261AND-1 implements five unidirectional HCMOS-compatible logic channels using capacitive isolation with set-hi/set-lo data encoding. Its internal continuous update circuit ensures output validity within 12 µs after power-up reset or fault recovery by sampling inputs every ~5 µs.

Each channel features a Schmitt-trigger input (VT+ = 2.0–4.2 V, VT− = 0.9–3.0 V), three-state output controlled by ENABLESYS and ENABLEFLD, and ≥10 kV/µs common-mode transient immunity. The isolation barrier exhibits ≤15 pF total capacitance and supports 750 V mains creepage spacing per IEC60950.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Rating	1.75 kV_rms operating voltage; enables safe interface between 24 V field-side I/O and 5 V system-side microcontrollers in industrial environments.
Logic Bandwidth	20 MHz minimum; supports reliable transmission of 50 ns pulses and high-frequency control signals such as PWM for IGBT gate drivers.
Propagation Delay	14 ns typical; ensures sub-25 ns timing alignment across isolated channels for synchronized digital control loops.
Edge Symmetry Error	±1 ns maximum (t_PHL vs t_PLH); preserves duty cycle fidelity essential for precision timing and feedback applications.
Common-Mode Transient Immunity	≥10 kV/µs; prevents false triggering during fast transients from motor switching or relay bounce in noisy factory settings.
Supply Voltage Range	4.0–5.75 V dc per side; accommodates brown-out conditions while maintaining full logic performance across –25°C to +85°C.
Quiescent Current	4 mA per side (8 mA total); enables low-power standby operation without compromising isolation integrity or enable responsiveness.

Pinout & Package

AD261AND-1 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 IEC60950 safety compliance. Pin 1 is located at bottom-left corner when viewed from top with notch facing up.

Pin/Terminal	Circuit Role	Design Meaning
1 (S0)	System-side input	Single unidirectional input line from microcontroller or system logic; drives corresponding F0 on field side.
2–5 (S1–S4)	System-side outputs	Four three-state outputs (S1–S4) driven by field-side inputs F1–F4; enabled/disabled via ENABLESYS.
6 (ENABLESYS)	System output enable	Active-low control that places S1–S4 into high-impedance state; allows bus multiplexing of multiple AD261AND-1 units.
7 (+5 V_dcSYS)	System power supply	5 V supply for system-side circuitry; requires local 0.01 µF bypass capacitor per Analog Devices recommendation.
8 (5 V RTNSYS)	System ground reference	Return path for system-side supply; must be isolated from field-side ground with ≥18 mm PCB creepage.
15 (5 V RTNFLD)	Field ground reference	Return path for field-side supply; electrically isolated from system ground; defines common-mode reference for field I/O.
16 (+5 V_dcFLD)	Field power supply	5 V supply for field-side receivers; powers F0–F4 input circuitry and internal continuous update logic.
17 (ENABLEFLD)	Field output enable	Active-low control that places F0–F4 into high-impedance state; enables safe power-up presetting using pull-up/down resistors.
18–22 (F0–F4)	Field-side I/O	F0 is output (driven by S0); F1–F4 are inputs (drive S1–S4); direction fixed per AD261AND-1 configuration.

Key Features

Feature	Design Value
Five-channel capacitive isolation	Replaces up to five optocouplers with matched timing, lower power, and no LED aging degradation.
Continuous output update	Guarantees valid output state within 12 µs after power-up or fault, eliminating need for external reset sequencing.
Configurable I/O direction	AD261AND-1 provides exactly 1 system-to-field input (S0→F0) and 4 field-to-system outputs (F1–F4→S1–S4).
HCMOS-compatible interface	Accepts standard 5 V logic levels with Schmitt-trigger inputs (0.4–1.5 V hysteresis) for noise margin in industrial environments.
UL1950/IEC60950 certified	Meets international safety standards for reinforced insulation; enables CE marking with only external bypass capacitors.

Applications

PLC Analog I/O Cards	IGBT Motor Drive Controls
Use Scenario: Isolating 4 analog output DAC control lines and 1 status feedback line between CPU board and field-connected 4–20 mA transmitters. IC Role / Device Role / Timing Role: AD261AND-1 serves as the unidirectional logic bridge: S0 carries fault flag from field, while S1–S4 carry DAC update commands to field-side DACs. Use Value: 14 ns propagation delay ensures synchronized updates across all four DACs, preventing transient current spikes during multi-channel calibration.	Use Scenario: Transmitting PWM gate drive enable signals and receiving overcurrent fault flags between MCU and isolated IGBT half-bridge drivers. IC Role / Device Role / Timing Role: AD261AND-1 routes one PWM enable command (S0→F0) and returns four independent fault flags (F1–F4→S1–S4) from driver ICs. Use Value: ±1 ns edge symmetry preserves PWM duty cycle accuracy across isolation, critical for maintaining motor torque linearity and minimizing EMI.
Industrial Data Acquisition	High-Speed Digital I/O Ports
Use Scenario: Connecting 4 sensor ADC ready signals and 1 master clock enable from isolated sensor front-end to system-side FPGA. IC Role / Device Role / Timing Role: AD261AND-1 conveys clock enable (S0→F0) to synchronize sampling, while returning four ADC-ready strobes (F1–F4→S1–S4) to trigger data capture. Use Value: 20 MHz bandwidth supports burst-mode sampling at >10 MSPS, and 10 kV/µs transient immunity prevents missed samples during ESD events.	Use Scenario: Expanding isolated digital I/O on a modular controller chassis with hot-swap capability and shared backplane bus. IC Role / Device Role / Timing Role: AD261AND-1 provides one system-initiated command line (S0→F0) and four field-status return lines (F1–F4→S1–S4) per slot. Use Value: ENABLESYS/ENABLEFLD pins allow dynamic three-state control during hot insertion, preventing bus contention and ensuring glitch-free enumeration.

PLC Analog I/O Cards

IGBT Motor Drive Controls

Use Scenario: Isolating 4 analog output DAC control lines and 1 status feedback line between CPU board and field-connected 4–20 mA transmitters.

IC Role / Device Role / Timing Role: AD261AND-1 serves as the unidirectional logic bridge: S0 carries fault flag from field, while S1–S4 carry DAC update commands to field-side DACs.

Use Value: 14 ns propagation delay ensures synchronized updates across all four DACs, preventing transient current spikes during multi-channel calibration.

Use Scenario: Transmitting PWM gate drive enable signals and receiving overcurrent fault flags between MCU and isolated IGBT half-bridge drivers.

IC Role / Device Role / Timing Role: AD261AND-1 routes one PWM enable command (S0→F0) and returns four independent fault flags (F1–F4→S1–S4) from driver ICs.

Use Value: ±1 ns edge symmetry preserves PWM duty cycle accuracy across isolation, critical for maintaining motor torque linearity and minimizing EMI.

Industrial Data Acquisition

High-Speed Digital I/O Ports

Use Scenario: Connecting 4 sensor ADC ready signals and 1 master clock enable from isolated sensor front-end to system-side FPGA.

IC Role / Device Role / Timing Role: AD261AND-1 conveys clock enable (S0→F0) to synchronize sampling, while returning four ADC-ready strobes (F1–F4→S1–S4) to trigger data capture.

Use Value: 20 MHz bandwidth supports burst-mode sampling at >10 MSPS, and 10 kV/µs transient immunity prevents missed samples during ESD events.

Use Scenario: Expanding isolated digital I/O on a modular controller chassis with hot-swap capability and shared backplane bus.

IC Role / Device Role / Timing Role: AD261AND-1 provides one system-initiated command line (S0→F0) and four field-status return lines (F1–F4→S1–S4) per slot.

Use Value: ENABLESYS/ENABLEFLD pins allow dynamic three-state control during hot insertion, preventing bus contention and ensuring glitch-free enumeration.

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
ADUM1401ARWZ	4-channel, 50 Mbps, 2.5 kV_rms isolation; uses iCoupler® magnetic coupling; no continuous update feature.	Lacks dedicated 1-input/4-output configuration; requires external logic for asymmetric I/O mapping.	Preferred when higher isolation rating and smaller SOIC-16 footprint are prioritized over guaranteed post-power-up output validity.
SI8641ED-B-IS	4-channel, 150 Mbps, 5 kV_rms; capacitive isolation; includes fail-safe default output states.	Fixed 4-output-only architecture; no field-side enable; requires external buffering for 1-input/4-output use case.	Chosen for ultra-high noise immunity in solar inverter controls, but mandates redesign to accommodate missing ENABLEFLD and asymmetric pinout.

Compared with AD261AND-1, ADUM1401ARWZ offers higher isolation voltage and speed but lacks native 1-in/4-out functionality and continuous update; SI8641ED-B-IS provides superior transient immunity and fail-safe defaults but requires external circuitry to replicate AD261AND-1's dual-enable, asymmetric I/O behavior.

Availability

AD261AND-1 is available at Aetrix Electronics and suitable for PLC analog I/O cards, IGBT motor drive controls, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for AD261AND-1 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 family was designed specifically for high-speed, low-latency digital signal isolation in industrial automation and control systems, emphasizing timing fidelity, transient resilience, and configurable I/O directionality.

FAQ

What is the isolation voltage rating of the AD261AND-1?

The AD261AND-1 has an operating isolation voltage rating of 1.75 kV_rms, verified by 100% production testing at 3.5 kV_rms. This rating applies to the reinforced insulation barrier between system and field sides, supporting safe operation in industrial environments with 24 V field supplies and 5 V system logic. The AD261AND-1 meets UL1950 and IEC60950 safety standards.

How does the AD261AND-1 handle power-up initialization?

The AD261AND-1 enters a power-up reset mode for approximately 30 µs after either supply crosses 3.3 V, disabling all outputs. Its internal continuous update circuit then samples inputs every ~5 µs, guaranteeing valid output states within 12 µs after reset completion. This eliminates the need for external reset sequencing or watchdog timers in systems using AD261AND-1.

Can the AD261AND-1 replace optocouplers in existing designs?

Yes - the AD261AND-1 replaces up to five discrete optocouplers with identical pin-compatible footprints (ND-22A), offering superior 20 MHz bandwidth, 14 ns propagation delay, and no LED aging. Unlike optocouplers, AD261AND-1 maintains consistent timing over temperature and lifetime, and its ENABLESYS/ENABLEFLD pins simplify bus multiplexing without additional logic gates.

What is the function of pins S1–S4 and F1–F4 on the AD261AND-1?

On the AD261AND-1, S1–S4 are system-side three-state outputs driven by field-side inputs F1–F4 respectively; F0 is the field-side output driven by system-side input S0. This 1-input/4-output configuration is hardwired per the ordering code - no reconfiguration is possible. Unused S pins (S1–S4) must be tied high or low; floating inputs are prohibited.

Does the AD261AND-1 support bidirectional communication?

No - the AD261AND-1 implements five unidirectional logic channels with fixed direction per model. For AD261AND-1, communication flows exclusively from S0 to F0 (system → field), and from F1–F4 to S1–S4 (field → system). Bidirectional signaling requires separate transmit/receive pairs or alternative devices like ADUM1402, not AD261AND-1.

AD261AND-1 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:: 1/4

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-1 FAQ

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

Please submit a Request for Quotation (RFQ) for AD261AND-1 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-1 reliable?

The price and inventory of AD261AND-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD261AND-1 is usually 5 days.

3.What payment methods are accepted for AD261AND-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD261AND-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD261AND-1?

AD261AND-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD261AND-1 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-1?

For technical support, including AD261AND-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD261AND-1 requirements.

6.How does Aetrix verify that AD261AND-1 is sourced from the original manufacturer or authorized distributors?

All AD261AND-1 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-1 meets industry standards.

7.What is the process for return or replacement of AD261AND-1?

All AD261AND-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD261AND-1, 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-1 part is unused and in its original packaging.

Return procedure for AD261AND-1:

1.Submit a request within 90 days.

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

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