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Analog Devices Inc./Maxim Integrated MAX22421BASA+T
- Part No.:
- MAX22421BASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22421BASA+T.pdf
- Description:
- 2-CHANNEL, 3.0KVRMS, DIGITAL GAL
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
MAX22421BASA+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 MAX22421BASA+T datasheet, MAX22421BASA+T pinout, MAX22421BASA+T application, or MAX22421BASA+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 and compact micro-PLC systems.
Technical Context
The MAX22421BASA+T implements capacitive galvanic isolation using Analog Devices' proprietary process, supporting independent 1.71V–5.5V supplies on each side for level-shifting functionality. Its dual unidirectional channels operate in opposite directions: Side A inputs (IN1, IN2) drive Side B outputs (OUT2, OUT1), enabling bidirectional signal routing across isolated domains without external logic.
It features a 29ns (typ) glitch rejection filter, 200kV/μs CMTI, and refresh circuitry ensuring output validity during static input conditions. Startup behavior includes UVLO monitoring on both VDDA and VDDB, with defined high-Z and default-state transitions during undervoltage events per Table 3 of the datasheet.
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 communication in isolated fieldbus nodes |
| Supply Current | 11.3μA per channel at DC / 3.3V - enables multi-year battery life in wireless sensor nodes |
| Propagation Delay | 51ns (typ) at 3.3V - ensures low-latency timing in closed-loop control systems |
| CMTI | 200kV/μs (min) - maintains signal integrity in noisy motor-drive or power-converter environments |
| Glitch Rejection | 29ns (typ) - suppresses EMI-induced transients on industrial I/O lines |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and factory-floor deployment |
Pinout & Package
MAX22421BASA+T is housed in an 8-pin narrow SOIC package (S8MS+24 outline, 4mm creepage/clearance) with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDDA | Side A power supply input | Bypass with 0.1μF ceramic capacitor to GNDA; sets logic-high level on Side A inputs/outputs |
| 2 - IN1 | Side A digital input channel 1 | Drives OUT2 on Side B; compatible with 1.71V–5.5V logic families |
| 3 - IN2 | Side A digital input channel 2 | Drives OUT1 on Side B; independent of IN1 timing and voltage domain |
| 4 - GNDA | Side A ground reference | Must be separated from GNDB by isolation barrier; return path for VDDA and Side A signals |
| 5 - GNDB | Side B ground reference | Return path for VDDB and Side B outputs; galvanically isolated from GNDA |
| 6 - OUT2 | Side B digital output channel 2 | Driven by IN1; push-pull output eliminates need for external pull-up resistors |
| 7 - OUT1 | Side B digital output channel 1 | Driven by IN2; TTL/CMOS-compatible; sinks/sourses ±4mA at 5V |
| 8 - VDDB | Side B power supply input | Bypass with 0.1μF ceramic capacitor to GNDB; sets logic-high level on Side B outputs |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | 3kVRMS withstand (60s), UL1577 certified - meets IEC 61800-5-1 for functional safety in drive systems |
| Ultra-Low Power | 90.7μW/channel at 1Mbps/1.8V - reduces thermal load in sealed enclosures and extends battery runtime |
| Opposite-Direction Channels | IN1→OUT2 + IN2→OUT1 configuration - enables full-duplex isolated UART or SPI clock/data separation |
| Independent Dual Supplies | VDDA (1.71–5.5V) and VDDB (1.71–5.5V) - allows 3.3V MCU to interface with 5V PLC backplane or 1.8V sensor ASIC |
| UVLO with Defined States | Outputs enter high-Z (VDDB UVLO) or default state (VDDA UVLO) - prevents undefined logic states during brownout |
Applications
| 4–20mA Loop Isolation | Battery-Powered Sensor Node |
|---|---|
Use Scenario: Isolating analog transmitter output in hazardous-area process instrumentation with intrinsic safety requirements. IC Role / Device Role / Timing Role: Digital isolator bridging microcontroller UART to isolated 4–20mA DAC driver while blocking ground loops and surge transients. Use Value: Enables IECEx/ATEX-certified designs using single MAX22421BASA+T for bidirectional control and status reporting within 1.5mm PCB creepage constraints. |
Use Scenario: Remote environmental monitor powered by coin-cell battery with wireless telemetry and isolated analog front-end. IC Role / Device Role / Timing Role: Low-power isolator relaying ADC readings and configuration commands between ultra-low-power MCU and isolated sensor supply domain. Use Value: 11.3μA/channel DC consumption extends 10-year battery life; 200kV/μs CMTI rejects EMI from RF transceivers sharing same PCB. |
| Compact Micro PLC I/O Module | Parasitically Powered Field Device |
Use Scenario: DIN-rail mounted micro-PLC with isolated digital inputs/outputs in space-constrained cabinet. IC Role / Device Role / Timing Role: Bidirectional signal isolator enabling simultaneous status feedback and command execution over shared isolated bus. Use Value: Opposite-direction channel mapping (IN1→OUT2, IN2→OUT1) eliminates need for external cross-wiring; narrow SOIC fits 12.7mm pitch I/O headers. |
Use Scenario: Loop-powered valve positioner drawing energy solely from 4–20mA loop with no auxiliary supply. IC Role / Device Role / Timing Role: Ultra-low-power isolator transferring HART modem signals across isolation barrier without loading loop current. Use Value: 15.4μA/channel at 100kbps ensures <1% loop current deviation; 1.71V minimum supply enables operation down to 3.6V loop compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX22420BASA+T | Same package and isolation rating, but channels are unidirectional same-direction (IN1→OUT1, IN2→OUT2) | Suitable for isolated parallel bus or dual-signal forwarding where direction alignment matters | Select MAX22420BASA+T when both channels must transmit from Side A to Side B without crossing |
| ISO6721DR | Texas Instruments device in SOIC-8; 5000VRMS isolation; higher 20μA/channel DC current at 3.3V | Targeted at higher-voltage industrial drives requiring 5kVRMS; lacks IECEx intrinsic safety certification | Choose ISO6721DR only if 5kVRMS rating and TI ecosystem compatibility outweigh power and safety certification trade-offs |
Compared with MAX22420BASA+T and ISO6721DR, the MAX22421BASA+T uniquely combines opposite-direction channel mapping, 3kVRMS reinforced isolation with UL/cUL/IECEx pending approvals, and industry-leading 11.3μA/channel DC consumption - making it optimal for space- and power-constrained bidirectional isolated interfaces.
Availability
MAX22421BASA+T is available at Aetrix Electronics and suitable for 4–20mA loop process control, battery management systems, and compact micro-PLC applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX22421BASA+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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and isolation-critical systems.
The MAX22421BASA+T belongs to Analog Devices' MAX224xx family of reinforced digital isolators, engineered specifically for ultra-low-power, intrinsically safe, and space-constrained industrial automation and process control applications.
FAQ
What is the isolation voltage rating of the MAX22421BASA+T?
The MAX22421BASA+T is rated for 3kVRMS isolation withstand voltage for 60 seconds (VISO) and continuously supports 445VRMS working voltage (VIOWM). It meets UL1577 and cUL CSA Bulletin 5A standards, with VDE 0884-11 reinforced insulation certification pending. These ratings apply to its 8-pin narrow SOIC package with 4mm creepage and clearance.
Does the MAX22421BASA+T support level shifting between different logic voltages?
Yes, the MAX22421BASA+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 sensor ASIC on Side A with a 5V PLC controller on Side B, with logic thresholds scaling automatically to each supply - no external level translators required.
How does the MAX22421BASA+T handle undervoltage conditions on its power supplies?
The MAX22421BASA+T monitors both VDDA and VDDB for undervoltage lockout (UVLO). If VDDA drops below ~1.59V, outputs assume their default state (high or low per variant); if VDDB drops below UVLO, outputs go high-Z. Recovery timing is specified: tUVLO_EN = 1.1–1.7ms (output valid after VDDB rise), tUVLO_DE = 0.5ms (default state after VDDA fall).
What is the channel direction configuration of the MAX22421BASA+T?
The MAX22421BASA+T has opposite-direction channel mapping: IN1 on Side A drives OUT2 on Side B, and IN2 on Side A drives OUT1 on Side B. This configuration enables native full-duplex communication - for example, UART TX/RX isolation - without external signal routing or additional logic gates.
Is the MAX22421BASA+T suitable for intrinsic safety (IS) applications?
Yes, the MAX22421BASA+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 (11.3μA/channel at DC), reinforced 3kVRMS isolation, and 200kV/μs CMTI make it suitable for use in hazardous-area field devices powered from energy-limited loops or barriers.
MAX22421BASA+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):
- 136ns, 136ns
- Pulse Width Distortion (Max):
- 15ns
- 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
MAX22421BASA+T FAQ
1.How can I place an order for MAX22421BASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22421BASA+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 MAX22421BASA+T reliable?
The price and inventory of MAX22421BASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22421BASA+T is usually 5 days.
3.What payment methods are accepted for MAX22421BASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22421BASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22421BASA+T?
MAX22421BASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22421BASA+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 MAX22421BASA+T?
For technical support, including MAX22421BASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22421BASA+T requirements.
6.How does Aetrix verify that MAX22421BASA+T is sourced from the original manufacturer or authorized distributors?
All MAX22421BASA+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 MAX22421BASA+T meets industry standards.
7.What is the process for return or replacement of MAX22421BASA+T?
All MAX22421BASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22421BASA+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 MAX22421BASA+T part is unused and in its original packaging.
Return procedure for MAX22421BASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22421BASA+T Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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