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Analog Devices Inc./Maxim Integrated MAX22420FASA+
- Part No.:
- MAX22420FASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22420FASA+.pdf
- Description:
- 4-CHANNEL, ULTRA-LOW POWER DIGIT
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
MAX22420FASA+ from Analog Devices is a reinforced, ultra-low-power, two-channel digital isolator in narrow SOIC package with 4mm creepage/clearance and 3kVRMS isolation rating. It features unidirectional channel configuration (A→B), 10Mbps max data rate, 51ns typical propagation delay at 3.3V, and consumes only 11.4μA per channel at DC. It enables isolated 4–20mA loop interfaces and battery-powered sensor nodes.
For engineers reviewing the MAX22420FASA+ datasheet, MAX22420FASA+ pinout, MAX22420FASA+ application, or MAX22420FASA+ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in process control and parasitic power systems, and confirmed alternative options for design-in flexibility.
Technical Context
The MAX22420FASA+ implements capacitive galvanic isolation using Analog Devices' proprietary process, supporting independent 1.71V–5.5V supplies on both sides for level-shifting capability. Its dual unidirectional channels isolate logic signals between GNDA and GNDB domains while maintaining signal integrity under high CMTI stress (≥200kV/μs).
It integrates a refresh circuit to retain output state during indefinite input static conditions and features undervoltage lockout (UVLO) with 1.59V threshold and 30mV hysteresis on both VDDA and VDDB rails-ensuring fail-safe default behavior during supply sag or startup transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3kVRMS for 60s (VISO); 445VRMS continuous working voltage (VIOWM) |
| Max Data Rate | 10Mbps - supports high-speed industrial communication without timing bottlenecks |
| Propagation Delay | 51ns typ at 3.3V - enables sub-100ns system-level latency in closed-loop control |
| Supply Current | 11.4μA per channel at DC (3.3V) - extends battery life in energy-constrained IoT nodes |
| CMTI | ≥200kV/μs - rejects fast common-mode transients in motor drives and power converters |
| Glitch Filter | 29ns typ - suppresses noise-induced false triggering in noisy factory environments |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
MAX22420FASA+ is housed in an 8-pin narrow SOIC package (S8MS+24 outline, 4mm creepage/clearance), RoHS-compliant, with thermal resistance θJA = 172.8°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDDA | Side A power supply | Bypass with 0.1μF ceramic capacitor; sets logic-high level on input side (1.71–5.5V) |
| 2 IN1 | Input channel 1 (Side A) | Accepts CMOS/TTL logic; 0.7×VDDA min VIH ensures robust low-voltage operation |
| 3 IN2 | Input channel 2 (Side A) | Independent unidirectional input; supports dual-sensor or dual-control signal isolation |
| 4 GNDA | Side A ground reference | Must be separated from GNDB; defines return path for Side A logic domain |
| 5 GNDB | Side B ground reference | Galvanically isolated return for output side; critical for noise immunity in field-side circuits |
| 6 OUT2 | Output channel 2 (Side B) | Push-pull driver; no external pull-up needed; sinks/supplies ±4mA at 5V |
| 7 OUT1 | Output channel 1 (Side B) | Unidirectional output aligned with IN1; matches timing skew ≤6ns (channel-to-channel) |
| 8 VDDB | Side B power supply | Independent rail (1.71–5.5V); enables level translation between 1.8V MCU and 3.3V PLC I/O |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | UL 1577 & cUL certified for 3kVRMS; meets DIN VDE 0884-11 pending approval - eliminates need for external safety barriers in Class I equipment |
| Ultra-Low Power | 90.7μW/channel at 1Mbps (1.8V) - enables self-powered field devices drawing <100μA total quiescent current |
| High CMTI | ≥200kV/μs - prevents data corruption during IGBT switching transients in inverters and servo drives |
| Fail-Safe UVLO | Outputs default to defined state (not floating) during input-supply brownout - avoids undefined PLC actuator states |
| Glitch Immunity | 29ns typ filter - rejects EFT bursts and conducted noise without software debouncing overhead |
Applications
| 4–20mA Loop Isolation | Battery Management Systems |
|---|---|
Use Scenario: Isolating analog current-loop transmitters from microcontroller ADC inputs in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Digital isolator bridging field-side 24V loop and logic-side 3.3V MCU; transfers status/control bits across isolation barrier. Use Value: Enables intrinsic safety compliance via 3kVRMS reinforced isolation and ±10kV surge withstand, eliminating separate barrier modules. | Use Scenario: Monitoring cell voltage and temperature in compact, low-power battery packs where PCB space and leakage current are constrained. IC Role / Device Role / Timing Role: Isolating BMS MCU from high-side cell monitoring ICs; transmitting fault flags and SOC updates at ≤1Mbps. Use Value: 11.4μA/channel DC consumption extends standby time; wide 1.71–5.5V supply range accommodates aging battery voltages. |
| Compact Micro PLC I/O | Parasitically Powered Sensors |
Use Scenario: Providing isolated digital I/O in space-constrained micro PLCs used in modular machine control cabinets. IC Role / Device Role / Timing Role: Dual-channel isolator handling discrete input sensing and output actuation signals between controller and field wiring. Use Value: 51ns propagation delay ensures deterministic scan-cycle timing; narrow SOIC footprint saves >30% board area vs. legacy optocouplers. | Use Scenario: Powering and isolating smart sensors directly from 4–20mA loop current, with no auxiliary supply required. IC Role / Device Role / Timing Role: Isolator enabling bidirectional communication (e.g., HART) while powering downstream circuitry from loop-derived energy. Use Value: Ultra-low 11.4μA/channel quiescent current maximizes usable loop current for sensor electronics and RF transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8620ED-B-IS | 2-channel, 5kVRMS reinforced isolation; 150kV/μs CMTI; 10Mbps; 8-WSON package (3mm × 3mm) | Higher isolation rating and smaller footprint, but higher supply current (20μA/ch @ DC) | Preferred when space is critical and 5kVRMS is required; less suitable for ultra-low-power battery designs. |
| ISO6720FDWR | 2-channel, 5000VRMS reinforced isolation; 100kV/μs CMTI; 10Mbps; SOIC-8 package; 12μA/ch @ DC | Slightly higher quiescent current than MAX22420FASA+, identical pinout but different default output polarity | Drop-in replacement for layout compatibility; verify default-high/low requirement matches system reset behavior. |
Compared with SI8620ED-B-IS and ISO6720FDWR, the MAX22420FASA+ delivers the lowest DC supply current (11.4μA/ch) in narrow SOIC, making it optimal for energy harvesting and long-life battery systems where every nanoamp matters.
Availability
MAX22420FASA+ is available at Aetrix Electronics and suitable for 4–20mA loop process control, battery management systems, and compact micro PLCs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX22420FASA+ 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 (now part of Analog Devices, Inc. following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The MAX22420FASA+ belongs to the MAX22xxx family of reinforced digital isolators, engineered specifically for ultra-low-power, high-reliability isolation in industrial automation, energy metering, and safety-critical sensor interfaces.
FAQ
What is the isolation voltage rating of the MAX22420FASA+?
The MAX22420FASA+ is rated for 3kVRMS withstand voltage for 60 seconds (VISO) and continuously supports 445VRMS working voltage (VIOWM). It meets UL 1577 and CSA Bulletin 5A standards for reinforced insulation, with pending VDE 0884-11 certification. This rating applies specifically to the narrow SOIC package variant.
Does the MAX22420FASA+ support level shifting between different logic voltages?
Yes, the MAX22420FASA+ supports true bidirectional level shifting: VDDA and VDDB can each be independently set from 1.71V to 5.5V. For example, it can translate signals from a 1.8V microcontroller (Side A) to a 3.3V PLC I/O module (Side B), with full timing guarantees across the entire supply range.
What is the default output state of the MAX22420FASA+ during power-up or undervoltage?
During input-supply undervoltage (VDDA below 1.59V), the MAX22420FASA+ outputs assume a default state-high for default-high variants, low for default-low variants. During output-supply undervoltage (VDDB below UVLO threshold), outputs go high-impedance. The MAX22420FASA+ is a default-high variant per its ordering code suffix.
Can the MAX22420FASA+ be used in intrinsic safety (IS) applications?
Yes-the MAX22420FASA+ carries pending IECEx and ATEX certification for intrinsic safety (II 1G Ex ia IIC Ga), validated for use in hazardous areas. Its ultra-low power consumption (11.4μA/ch) and reinforced isolation enable safe integration into IS loops without additional energy-limiting components.
How does the glitch rejection filter in the MAX22420FASA+ improve system reliability?
The MAX22420FASA+ incorporates a 29ns typical glitch rejection filter that suppresses short-duration noise spikes (<37ns) on input lines-critical in electrically noisy industrial environments. This eliminates false triggering without requiring firmware-based debouncing, reducing MCU load and improving real-time response in safety-critical control paths.
MAX22420FASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- 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):
- 200kV/µs
- Data Rate:
- 10Mbps
- Propagation Delay tpLH / tpHL (Max):
- 61ns, 61ns
- Pulse Width Distortion (Max):
- 6ns
- Rise / Fall Time (Typ):
- 5ns, 5ns
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX22420FASA+ FAQ
1.How can I place an order for MAX22420FASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22420FASA+ 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 MAX22420FASA+ reliable?
The price and inventory of MAX22420FASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22420FASA+ is usually 5 days.
3.What payment methods are accepted for MAX22420FASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22420FASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22420FASA+?
MAX22420FASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22420FASA+ 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 MAX22420FASA+?
For technical support, including MAX22420FASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22420FASA+ requirements.
6.How does Aetrix verify that MAX22420FASA+ is sourced from the original manufacturer or authorized distributors?
All MAX22420FASA+ 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 MAX22420FASA+ meets industry standards.
7.What is the process for return or replacement of MAX22420FASA+?
All MAX22420FASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX22420FASA+, 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 MAX22420FASA+ part is unused and in its original packaging.
Return procedure for MAX22420FASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22420FASA+ Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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