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Analog Devices Inc./Maxim Integrated MAX22421BASA+
- Part No.:
- MAX22421BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22421BASA+.pdf
- Description:
- 2-CH 3KVRMS DIGITAL ISOLATOR
- Quantity:
- Payment:
- Shipping:
Inventory:638
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Product details
Overview
MAX22421BASA+ from Analog Devices is a reinforced, ultra-low-power, two-channel digital isolator with bidirectional channel configuration (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+ datasheet, MAX22421BASA+ pinout, MAX22421BASA+ application, or MAX22421BASA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in parasitically powered systems, and validated alternative options for reinforced isolation in compact micro-PLC and BMS designs.
Technical Context
The MAX22421BASA+ implements capacitive galvanic isolation using Analog Devices' proprietary process, supporting independent 1.71V–5.5V supplies on both sides for level translation. Its bidirectional channel architecture isolates signal paths between field-side sensor circuits and controller-side logic domains while maintaining timing integrity.
It features a 29ns (typ) glitch rejection filter, 200kV/μs CMTI, and refresh circuitry ensuring output validity during indefinite DC input states - critical for safety-critical loop-powered transmitters where signal stagnation must not compromise output reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000VRMS for 60s (VISO); 445VRMS continuous working voltage (VIOWM) - enables safe operation in Class I, Division 2 hazardous locations. |
| Max Data Rate | 10Mbps - supports high-speed digital feedback in servo drives and fast-loop industrial controllers. |
| Supply Current | 11.3μA per channel at DC, 3.3V - reduces system power by >50% vs. legacy isolators, enabling energy harvesting in field devices. |
| Propagation Delay | 51ns (typ) at 3.3V - ensures sub-100ns end-to-end latency for time-critical closed-loop control. |
| CMTI | 200kV/μs (min) - prevents false triggering in noisy motor drive or power converter environments with fast dv/dt transients. |
| Glitch Filter | 29ns (typ) - suppresses ESD-induced noise spikes without compromising signal edge fidelity in 4–20mA HART communication. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors and outdoor industrial enclosures. |
Pinout & Package
MAX22421BASA+ is housed in an 8-pin narrow SOIC package (S8MS+24 outline) with 4mm creepage/clearance, RoHS-compliant, and 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 (1.71–5.5V) for IN1/IN2 inputs. |
| 2 IN1 | Logic input 1 (Side A) | Drives OUT2 on Side B; compatible with CMOS/TTL; 0.7×VDDA threshold. |
| 3 IN2 | Logic input 2 (Side A) | Drives OUT1 on Side B; independent of IN1; supports dual-sensor interface. |
| 4 GNDA | Side A ground reference | Return path for VDDA and IN1/IN2; galvanically isolated from GNDB. |
| 5 GNDB | Side B ground reference | Return path for VDDB and OUT1/OUT2; separates field-side and controller-side grounds. |
| 6 OUT2 | Logic output 2 (Side B) | Sink/source capable (±4mA); driven by IN1; push-pull eliminates external pull-ups. |
| 7 OUT1 | Logic output 1 (Side B) | Sink/source capable (±4mA); driven by IN2; default-low or default-high configurable per variant. |
| 8 VDDB | Side B power supply input | Bypass with 0.1μF ceramic capacitor; sets logic-high level (1.71–5.5V) for OUT1/OUT2 outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Channel Mapping | IN1→OUT2 and IN2→OUT1 enables full-duplex isolated communication without external routing logic. |
| Ultra-Low-Power Operation | 90.7μW per channel at 1Mbps/1.8V - extends battery life in wireless sensor nodes beyond 10 years. |
| Reinforced Isolation Certification | UL1577, cUL CSA 5A, and pending VDE 0884-11 - meets IEC 61000-4-5 surge immunity requirements for industrial equipment. |
| Independent Dual-Supply Architecture | VDDA and VDDB each support 1.71–5.5V - allows 3.3V microcontroller to interface with 5V analog front-end or 1.8V FPGA core. |
| Refresh Circuitry | Maintains valid output state during infinite DC input - prevents latch-up in open-wire 4–20mA transmitter faults. |
Applications
| 4–20mA Loop Transmitter | Battery Management System (BMS) |
|---|---|
Use Scenario: Isolating analog sensor signals and digital HART modulation in loop-powered field transmitters. IC Role / Device Role / Timing Role: Bidirectional digital isolator transferring HART FSK signals (1200/2200Hz) and status bits across isolation barrier. Use Value: Enables single-supply, parasitic powering from 4–20mA loop while meeting IEC 61000-4-5 Level 4 surge immunity (±10kV). | Use Scenario: Isolating cell voltage monitoring and balancing control signals in multi-cell Li-ion packs. IC Role / Device Role / Timing Role: Transmitting ADC readouts and MOSFET gate commands between high-side monitor IC and low-side MCU. Use Value: Ultra-low quiescent current (11.3μA/ch) minimizes self-discharge, preserving pack standby time over 5-year service life. |
| Compact Micro PLC | Parasitically Powered Sensor Node |
Use Scenario: Providing isolated digital I/O for DIN-rail mounted micro-PLCs with space-constrained PCBs. IC Role / Device Role / Timing Role: Galvanically isolating discrete input status and output control signals between field wiring and CPU bus. Use Value: 8-pin SOIC footprint and 10Mbps capability allow 32-channel isolation in <10cm² area, reducing board cost vs. optocoupler solutions. | Use Scenario: Powering wireless temperature/humidity sensors directly from 4–20mA loop with no local battery. IC Role / Device Role / Timing Role: Isolating microcontroller UART and sensor SPI lines while operating from harvested loop energy. Use Value: 1.71V minimum supply enables operation down to 3.6V loop drop, maximizing usable voltage headroom for RF and sensing circuits. |
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 | 2-channel, unidirectional, 5kVRMS, 150Mbps, 1.7μA/ch @ 3.3V/DC - higher speed but no bidirectional channel mapping. | Requires external signal routing for full-duplex use; lacks integrated glitch filter. | Select when >10Mbps throughput is required and channel direction can be managed externally. |
| SI8621ED-B-IS | 2-channel, bidirectional, 5kVRMS, 10Mbps, 20μA/ch @ 3.3V/DC - wider SOIC package (8mm creepage), higher quiescent current. | Supports same bidirectional topology but consumes ~77% more power per channel than MAX22421BASA+. | Select when 5kVRMS isolation is mandatory and power budget allows ≥20μA/ch. |
Compared with ADUM120N0BRZ-RL7 and SI8621ED-B-IS, MAX22421BASA+ uniquely combines bidirectional channel mapping, 3kVRMS reinforced isolation in narrow SOIC, and industry-leading 11.3μA/ch ultra-low power - making it optimal for space- and energy-constrained loop-powered industrial nodes.
Availability
MAX22421BASA+ is available at Aetrix Electronics and suitable for 4–20mA loop transmitters, battery management systems, and compact micro-PLC designs requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.
Supply support for MAX22421BASA+ 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 MAX22421BASA+ belongs to the MAX224xx family of reinforced digital isolators, engineered specifically for ultra-low-power, high-CMTI isolation in space-constrained industrial automation and process control systems.
FAQ
What is the isolation voltage rating of the MAX22421BASA+?
The MAX22421BASA+ is rated for 3000VRMS withstand voltage for 60 seconds (VISO) and 445VRMS continuous working voltage (VIOWM), certified to UL1577 and cUL CSA Bulletin 5A for reinforced insulation - confirming suitability for industrial equipment requiring basic and reinforced isolation per IEC 61010-1.
Does the MAX22421BASA+ support bidirectional signal flow between its two channels?
Yes, the MAX22421BASA+ implements a fixed bidirectional channel mapping: IN1 on Side A drives OUT2 on Side B, and IN2 on Side A drives OUT1 on Side B. This eliminates need for external cross-wiring in full-duplex isolated interfaces such as HART-enabled 4–20mA transmitters.
What is the typical supply current consumption of the MAX22421BASA+ at DC and 3.3V?
The MAX22421BASA+ draws 11.3μA per channel at DC and 3.3V supply (IDDA and IDDB), totaling 22.6μA for both channels - among the lowest quiescent currents in the reinforced digital isolator category, enabling multi-year battery life in remote sensors.
Can the MAX22421BASA+ be used for level translation between different logic voltages?
Yes, the MAX22421BASA+ supports independent 1.71V–5.5V supplies on Side A (VDDA) and Side B (VDDB), allowing seamless level shifting - for example, interfacing a 1.8V FPGA I/O bank with a 5V analog front-end while maintaining galvanic isolation and signal integrity.
What safety certifications does the MAX22421BASA+ hold?
The MAX22421BASA+ is certified to UL1577 (File E351759) and cUL CSA Bulletin 5A for 3000VRMS reinforced isolation, with pending VDE 0884-11 certification and IECEx/ATEX intrinsic safety approval (Sira 0518 II 1G Ex ia IIC Ga), validating its use in hazardous location instrumentation.
MAX22421BASA+ 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:
- General Purpose
- Isolated Power:
- No
- 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+ FAQ
1.How can I place an order for MAX22421BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22421BASA+ 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+ reliable?
The price and inventory of MAX22421BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22421BASA+ is usually 5 days.
3.What payment methods are accepted for MAX22421BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22421BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22421BASA+?
MAX22421BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22421BASA+ 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+?
For technical support, including MAX22421BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22421BASA+ requirements.
6.How does Aetrix verify that MAX22421BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX22421BASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX22421BASA+?
All MAX22421BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX22421BASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX22421BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22421BASA+ Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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