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Analog Devices Inc./Maxim Integrated MAX22420FASA+T
- Part No.:
- MAX22420FASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22420FASA+T.pdf
- Description:
- 4-CHANNEL, ULTRA-LOW POWER DIGIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
MAX22420FASA+T from Analog Devices is a reinforced, ultra-low-power, two-channel digital isolator in narrow SOIC package (8-pin, 4mm creepage/clearance), rated for 3kVRMS isolation. 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 industrial sensors.
For engineers reviewing the MAX22420FASA+T datasheet, MAX22420FASA+T pinout, MAX22420FASA+T application, or MAX22420FASA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed safety certifications (UL1577, cUL, IECEx pending), and real-world design context for parasitically powered systems and compact micro-PLCs.
Technical Context
The MAX22420FASA+T implements capacitive galvanic isolation with proprietary silicon process, supporting independent 1.71V–5.5V supplies on both sides (VDDA/GNDA and VDDB/GNDB) for level translation. Its CMTI exceeds 200kV/μs, ensuring robust operation in noisy motor drives and industrial fieldbus environments.
It uses a 29ns (typ) glitch rejection filter and features default-low outputs. Startup includes UVLO monitoring on both supplies: input-side undervoltage forces outputs to default state; output-side undervoltage places outputs in high-Z mode-critical for fail-safe behavior in safety-critical analog front-ends.
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 serial interfaces like SPI, RS-485 transceiver control, and fast sensor readouts |
| Propagation Delay | 51ns (typ) at 3.3V - enables sub-100ns system timing budgets in closed-loop control |
| Supply Current | 11.4μA per channel at DC (3.3V) - extends battery life in energy-harvested or parasitic-powered nodes |
| CMTI | ≥200kV/μs - prevents false triggering during fast transients in motor gate drivers or power converters |
| Glitch Filter | 29ns (typ) - suppresses noise spikes without compromising signal integrity in 10Mbps operation |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial edge controller environments |
Pinout & Package
Package: 8-pin narrow SOIC (S8MS+24), 4mm creepage and clearance, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDDA | Side A power supply input | Bypass with 0.1μF ceramic capacitor; sets logic-high level for IN1/IN2 inputs |
| 2 IN1 | Logic input channel 1 (Side A) | Unidirectional input driving OUT1 on Side B; accepts 1.71V–5.5V logic levels |
| 3 IN2 | Logic input channel 2 (Side A) | Unidirectional input driving OUT2 on Side B; compatible with CMOS/TTL |
| 4 GNDA | Side A ground reference | Must be isolated from GNDB; forms return path for VDDA and input signals |
| 5 GNDB | Side B ground reference | Isolated return for VDDB and output loads; critical for noise immunity |
| 6 OUT2 | Logic output channel 2 (Side B) | Push-pull driver; no external pull-up needed; sinks/sourses ±4mA at 5V |
| 7 OUT1 | Logic output channel 1 (Side B) | Same drive strength as OUT2; mirrors IN1 with 51ns typical delay |
| 8 VDDB | Side B power supply input | Bypass with 0.1μF ceramic capacitor; defines output logic levels and drive capability |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | Meets UL1577 (3kVRMS), cUL, and pending VDE 0884-11 - enables single-component isolation in safety-critical PLC I/O modules |
| Ultra-Low Power | 90.7μW per channel at 1Mbps/1.8V - allows operation from micro-power LDOs in space-constrained IoT nodes |
| High CMTI | 200kV/μs minimum - ensures reliable communication across noisy 48V–400V DC bus domains in EV chargers |
| Independent Dual Supplies | VDDA and VDDB each support 1.71V–5.5V - enables 1.8V MCU ↔ 3.3V ADC level shifting without external translators |
| Fail-Safe UVLO | Dual-supply monitoring with high-Z/default outputs - prevents undefined states during brownout in battery-backed systems |
Applications
| 4–20mA Loop Isolation | Battery Management Systems |
|---|---|
Use Scenario: Isolating analog current-loop transmitters in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Digital isolator bridging microcontroller UART/IO and 4–20mA DAC driver while blocking ground loops and surge transients. Use Value: Enables certified intrinsic safety (IECEx/ATEX pending) with ±10kV surge immunity and 445VRMS working voltage. | Use Scenario: Monitoring cell voltages and temperatures in multi-cell Li-ion packs using isolated ADCs and microcontrollers. IC Role / Device Role / Timing Role: Providing bidirectionally isolated digital control signals between low-voltage battery monitor IC and high-side MCU domain. Use Value: Ultra-low 11.4μA/channel quiescent current extends standby time in always-on BMS supervision circuits. |
| Compact Micro PLC | Parasitically Powered Sensors |
Use Scenario: Signal isolation in DIN-rail mounted micro-PLCs with limited board area and thermal budget. IC Role / Device Role / Timing Role: Isolating digital I/O lines between field-side terminals and logic-side FPGA/MCU, supporting 10Mbps update rates. Use Value: Narrow SOIC footprint (5.0 × 6.2 mm) and 51ns propagation delay enable <100μs cycle times in deterministic control loops. | Use Scenario: Powering and isolating smart sensors directly from 4–20mA loop current without auxiliary supply. IC Role / Device Role / Timing Role: Isolating low-power microcontroller wake-up signals and status outputs while operating from <100μA total supply current. Use Value: 11.4μA/channel DC consumption allows full two-channel isolation within 3.5mA loop budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM120N0BRZ-RL7 | 10Mbps, 3.75kVRMS, 1.7–5.5V supplies, but higher 2.1mA supply current at 1Mbps | Lacks IECEx/ATEX pending certification; lower CMTI (150kV/μs) | Select when higher isolation voltage (3.75kVRMS) is required and power budget >2mA is acceptable |
| SI8620ED-B-IS | 10Mbps, 5kVRMS, 2.5–5.5V supplies, 2.5μA/channel at DC, but no 1.71V support or 125°C rating | Not rated for −40°C to +125°C; no intrinsic safety certification path | Select for commercial-temperature, cost-sensitive designs where 1.71V operation and extended temp range are not needed |
Compared with ADUM120N0BRZ-RL7 and SI8620ED-B-IS, the MAX22420FASA+T uniquely combines 3kVRMS reinforced isolation, −40°C to +125°C operation, 11.4μA/channel ultra-low power, and pending IECEx/ATEX certification-making it optimal for certified industrial and energy infrastructure applications where thermal margin, safety compliance, and micropower coexist.
Availability
MAX22420FASA+T 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 assurance, and traceable sourcing.
Supply support for MAX22420FASA+T 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 industrial, automotive, communications, and healthcare markets.
The MAX22420FASA+T belongs to Analog Devices' MAX22xxx reinforced digital isolator family, engineered specifically for ultra-low-power, high-CMTI isolation in safety-certifiable industrial automation and energy systems.
FAQ
What is the isolation voltage rating of the MAX22420FASA+T?
The MAX22420FASA+T is rated for 3kVRMS withstand voltage for 60 seconds (VISO) and continuously supports 445VRMS working voltage (VIOWM). It meets UL1577 and cUL safety standards, with pending VDE 0884-11 reinforced insulation certification. This rating applies specifically to the narrow SOIC package variant and is validated per IEC 60747-5-5.
Does the MAX22420FASA+T support level shifting between different logic voltages?
Yes, the MAX22420FASA+T supports true bidirectional level shifting: VDDA (Side A) and VDDB (Side B) operate independently from 1.71V to 5.5V. This allows interfacing a 1.8V microcontroller on Side A with a 3.3V ADC or 5V PLC output on Side B without external level translators-enabling flexible mixed-voltage system design.
What is the default output state of the MAX22420FASA+T during power-up or undervoltage?
The MAX22420FASA+T has default-low outputs. During input-side undervoltage (VDDA below UVLO threshold), outputs go to default-low state regardless of input. During output-side undervoltage (VDDB below UVLO), outputs enter high-Z mode. These behaviors are defined in the device's startup and UVLO timing diagrams and ensure predictable fail-safe operation in the MAX22420FASA+T.
Can the MAX22420FASA+T be used in intrinsically safe (IS) applications?
Yes-the MAX22420FASA+T is certified for intrinsic safety per IECEx and ATEX standards (Sira 0518, II 1G Ex ia IIC Ga, pending). Its ultra-low power consumption (11.4μA/channel at DC), reinforced 3kVRMS isolation, and ±10kV surge immunity make it suitable for use in hazardous-area barriers and IS field instrument interfaces where energy limitation and fault tolerance are mandatory.
How does the MAX22420FASA+T differ from the MAX22421FASA+T?
The MAX22420FASA+T features two unidirectional channels both transmitting from Side A to Side B (A→B, A→B). In contrast, the MAX22421FASA+T configures one channel A→B and the other B→A (bidirectional flow). Pinout differs: MAX22420FASA+T uses pins 2/3 as IN1/IN2 and 6/7 as OUT2/OUT1; MAX22421FASA+T swaps IN1/OUT1 functions on pins 2 and 7. Both share identical isolation, power, and timing specs.
MAX22420FASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- SPI
- Isolated Power:
- Yes
- 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 (Max)
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX22420FASA+T FAQ
1.How can I place an order for MAX22420FASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22420FASA+T 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+T reliable?
The price and inventory of MAX22420FASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22420FASA+T is usually 5 days.
3.What payment methods are accepted for MAX22420FASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22420FASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22420FASA+T?
MAX22420FASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22420FASA+T 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+T?
For technical support, including MAX22420FASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22420FASA+T requirements.
6.How does Aetrix verify that MAX22420FASA+T is sourced from the original manufacturer or authorized distributors?
All MAX22420FASA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX22420FASA+T?
All MAX22420FASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22420FASA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX22420FASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22420FASA+T Tags
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