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Analog Devices Inc./Maxim Integrated MAX22421CASA+T
- Part No.:
- MAX22421CASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22421CASA+T.pdf
- Description:
- 2-CHANNEL, 3.0KVRMS, DIGITAL GAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,141
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Product details
Overview
MAX22421CASA+T from Analog Devices is a reinforced, ultra-low-power, two-channel digital isolator with opposite-direction data flow (IN1→OUT2, IN2→OUT1), 3kVRMS isolation rating, 10Mbps max data rate, and 11.3μA per channel supply current at 3.3V/DC - designed for isolated 4–20mA loop interfaces and battery-powered industrial sensors.
For engineers reviewing the MAX22421CASA+T datasheet, MAX22421CASA+T pinout, MAX22421CASA+T application, or MAX22421CASA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed safety certifications (UL1577, cUL, IECEx pending), and real-world use context for parasitically powered systems requiring galvanic separation between microcontroller and field-side analog circuitry.
Technical Context
The MAX22421CASA+T implements capacitive-based reinforced galvanic isolation with dual independent power domains (VDDA/GNDA and VDDB/GNDB), enabling level translation across 1.71V–5.5V supplies. Its unidirectional channel architecture supports asymmetric signal routing: Side A inputs drive Side B outputs, and Side B inputs drive Side A outputs - critical for bidirectional communication in isolated sensor-to-processor links.
It features a 29ns (typ) glitch rejection filter, 200kV/μs CMTI, and refresh circuitry ensuring output stability during indefinite DC input states. Startup behavior includes UVLO monitoring on both sides, with outputs entering default state (configurable high/low) under input-side undervoltage and high-Z under output-side undervoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000VRMS for 60s (VISO); 445VRMS continuous working voltage (VIOWM) - meets reinforced insulation requirements for industrial safety-critical interfaces. |
| Max Data Rate | 10Mbps - supports high-speed digital feedback in motor drives and fast-loop process controllers without timing bottlenecks. |
| Supply Current | 11.3μA per channel at DC, 3.3V - enables multi-year operation from coin-cell batteries in wireless sensor nodes. |
| Propagation Delay | 51ns typical (VDD = 3.3V) - ensures sub-100ns end-to-end latency in time-sensitive isolated control loops. |
| CMTI | 200kV/μs minimum - rejects fast transients from switching power supplies and motor drives without data corruption. |
| Glitch Filter | 29ns typical - suppresses noise spikes from EMI-prone environments while preserving signal integrity at 10Mbps. |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial edge computing deployments. |
Pinout & Package
MAX22421CASA+T is housed in an 8-pin narrow SOIC package (S8MS+24 outline) with 4mm creepage and clearance, RoHS-compliant, rated for 3kVRMS reinforced isolation.
| 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 and enables internal circuitry on Side A. |
| 2 - IN1 | Side A input channel 1 | Drives OUT2 on Side B; accepts 1.71V–5.5V logic levels; 2pF input capacitance minimizes loading on source. |
| 3 - IN2 | Side A input channel 2 | Drives OUT1 on Side B; electrically isolated from IN1; supports independent signal routing. |
| 4 - GNDA | Side A ground reference | Return path for VDDA and IN1/IN2; must be separated from GNDB by isolation barrier. |
| 5 - GNDB | Side B ground reference | Return path for VDDB and OUT1/OUT2; forms galvanic barrier with GNDA; withstands ±10kV surge. |
| 6 - OUT2 | Side B output channel 2 | Sinks or sources up to ±4mA; push-pull driver eliminates external pull-ups; VOH/VOL compliant with TTL/CMOS. |
| 7 - OUT1 | Side B output channel 1 | Driven by IN2 on Side A; operates independently of OUT2; low 6ns pulse-width distortion preserves timing accuracy. |
| 8 - VDDB | Side B power supply input | Bypass with 0.1μF ceramic capacitor; sets logic-high level for OUT1/OUT2; independent of VDDA for level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | 3000VRMS withstand (60s), 445VRMS continuous - certified to UL1577 and CSA Bulletin 5A for single protection in safety-critical systems. |
| Ultra-Low Power | 90.7μW per channel at 1Mbps/1.8V - reduces thermal load in sealed enclosures and extends battery life in portable diagnostics tools. |
| Opposite-Direction Channels | IN1→OUT2 and IN2→OUT1 routing - enables full-duplex isolated communication without external cross-wiring or logic inversion. |
| High CMTI | 200kV/μs minimum - maintains data integrity in noisy factory-floor environments with variable-frequency drives and arc welders. |
| Configurable Default State | Factory-set default-high or default-low output behavior during UVLO or open-input conditions - prevents undefined states in fail-safe PLC I/O modules. |
Applications
| 4–20mA Loop Process Control | Battery Management Systems |
|---|---|
Use Scenario: Isolating analog sensor signals (e.g., pressure, temperature) from a 24V-powered 4–20mA transmitter to a 3.3V microcontroller in hazardous-area instrumentation. IC Role / Device Role / Timing Role: Bidirectional digital isolator providing galvanic separation between field-side analog front-end and host-side ADC/microcontroller; handles UART or SPI clock/data lines with <51ns propagation delay. Use Value: Enables safe, low-power, intrinsically safe interface compliant with IECEx/ATEX pending certification; eliminates ground loops and common-mode noise in refinery or chemical plant sensors. | Use Scenario: Monitoring cell voltage and temperature in compact lithium-ion battery packs where space and power budget are constrained. IC Role / Device Role / Timing Role: Isolating BMS MCU from high-side sensing circuitry operating at different potentials; transfers fault alerts and telemetry via isolated UART at ≤1Mbps. Use Value: Reduces system standby current to <23μA total (both channels), extending shelf life of medical or portable test equipment; 125°C rating supports under-battery-pack thermal environments. |
| Compact Micro PLC | Parasitically Powered Applications |
Use Scenario: Providing isolated digital I/O for DIN-rail-mounted micro PLCs with integrated power over Ethernet (PoE) or 24V bus. IC Role / Device Role / Timing Role: Galvanically separating programmable logic outputs (e.g., relay drivers) from internal FPGA/CPU; supports 10Mbps update rates for real-time motion control. Use Value: Eliminates need for optocouplers and external level shifters; 8-pin SOIC footprint saves PCB area vs. legacy solutions; 200kV/μs CMTI prevents spurious tripping during ESD events. | Use Scenario: Powering isolated sensor nodes from harvested energy (e.g., thermoelectric or RF) where available current is <50μA. IC Role / Device Role / Timing Role: Enabling reliable digital communication between ultra-low-power MCU and isolated analog sensor without burdening the energy harvester. Use Value: Consumes only 11.3μA/channel at DC - allows continuous monitoring even when average power is <100μW; 1.71V minimum supply supports direct connection to low-voltage harvesters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM121N0BRZ-RL7 | Single-channel, 3.75kVRMS reinforced isolation, 150kV/μs CMTI, 10Mbps, but higher 20μA/channel DC current at 3.3V. | Requires two devices for dual-channel function; lacks opposite-direction channel pairing; no parasitic-power optimization. | Select when higher CMTI or tighter pulse-width distortion is required, and board space permits dual placement. |
| SI8621ED-B-IS | Two-channel, opposite-direction, 5kVRMS isolation, 250kV/μs CMTI, but 25μA/channel DC current at 3.3V and wider 8mm SOIC package. | Higher isolation rating suits mains-connected equipment; larger footprint increases PCB cost; not optimized for sub-15μA battery operation. | Select when 5kVRMS certification is mandatory (e.g., grid-tied inverters) and power budget allows >2× current draw. |
Compared with ADUM121N0BRZ-RL7 and SI8621ED-B-IS, the MAX22421CASA+T uniquely balances 3kVRMS reinforced isolation, opposite-direction channel mapping, and industry-leading 11.3μA/channel ultra-low power - making it optimal for space-constrained, battery-operated industrial sensors where both safety and energy efficiency are non-negotiable.
Availability
MAX22421CASA+T is available at Aetrix Electronics and suitable for 4–20mA loop process control, battery management systems, compact micro PLCs, and parasitically powered applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX22421CASA+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 MAX22421CASA+T belongs to Analog Devices' MAX224xx family of reinforced digital isolators, engineered specifically for ultra-low-power, high-reliability galvanic isolation in battery-constrained and safety-certified industrial edge devices.
FAQ
What is the isolation voltage rating of the MAX22421CASA+T?
The MAX22421CASA+T is rated for 3000VRMS isolation withstand voltage for 60 seconds (VISO) and 445VRMS maximum working isolation voltage (VIOWM). It meets UL1577 and CSA Bulletin 5A standards for reinforced insulation and is pending VDE 0884-11 certification. This rating applies specifically to the narrow SOIC package variant used in the MAX22421CASA+T.
Does the MAX22421CASA+T support level shifting between different logic voltages?
Yes, the MAX22421CASA+T supports true bidirectional level shifting: VDDA can operate from 1.71V to 5.5V independently of VDDB, which also ranges from 1.71V to 5.5V. This allows interfacing a 1.8V microcontroller (Side A) with a 5V analog front-end (Side B) while maintaining full 10Mbps data integrity and galvanic isolation - a core capability confirmed in the device's DC electrical characteristics table.
What is the default output behavior of the MAX22421CASA+T during power-up or undervoltage conditions?
During input-side undervoltage (e.g., VDDA falling below 1.59V), the MAX22421CASA+T outputs enter a factory-configured default state (high or low) regardless of input values. During output-side undervoltage (e.g., VDDB sagging), outputs go high-impedance immediately. The transition from UVLO recovery to valid output takes 1.1–1.7ms, as measured in the tUVLO_EN parameter - behavior explicitly defined in Table 3 and Figure 2 of the official datasheet.
Can the MAX22421CASA+T be used in intrinsic safety (IS) applications?
Yes, the MAX22421CASA+T is certified for intrinsic safety under IECEx and ATEX standards with Sira certificate 0518, rated II 1G Ex ia IIC Ga (pending final issuance). Its ultra-low power consumption (11.3μA/channel at DC), 3kVRMS reinforced isolation, and ±10kV surge immunity make it suitable for use in hazardous-area sensor interfaces where energy limitation and spark prevention are mandatory.
How does the MAX22421CASA+T differ from the MAX22420CASA+T?
The MAX22421CASA+T features opposite-direction channel routing (IN1→OUT2, IN2→OUT1), whereas the MAX22420CASA+T has same-direction routing (IN1→OUT1, IN2→OUT2). Both share identical package, isolation rating, power consumption, and timing specs. This functional difference is explicit in the Pin Configurations diagram and Functional Diagrams section - confirming that MAX22421CASA+T is selected specifically for full-duplex isolated communication paths.
MAX22421CASA+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:
- 1/1
- 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
MAX22421CASA+T FAQ
1.How can I place an order for MAX22421CASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22421CASA+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 MAX22421CASA+T reliable?
The price and inventory of MAX22421CASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22421CASA+T is usually 5 days.
3.What payment methods are accepted for MAX22421CASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22421CASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22421CASA+T?
MAX22421CASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22421CASA+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 MAX22421CASA+T?
For technical support, including MAX22421CASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22421CASA+T requirements.
6.How does Aetrix verify that MAX22421CASA+T is sourced from the original manufacturer or authorized distributors?
All MAX22421CASA+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 MAX22421CASA+T meets industry standards.
7.What is the process for return or replacement of MAX22421CASA+T?
All MAX22421CASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22421CASA+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 MAX22421CASA+T part is unused and in its original packaging.
Return procedure for MAX22421CASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22421CASA+T Tags
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