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Analog Devices Inc./Maxim Integrated MAX22291CASA/V+T
- Part No.:
- MAX22291CASA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX22291CASA/V+T.pdf
- Description:
- REINFORCED, FAST, LOW-POWER 2-CH
- Quantity:
- Payment:
- Shipping:
Inventory:3,415
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Product details
Overview
MAX22291CASA/V+T from Analog Devices is a reinforced, two-channel, unidirectional digital isolator in 8-pin narrow SOIC with 4mm creepage/clearance, rated for 3kVRMS withstand voltage (60s), 445VRMS working voltage, and 200Mbps data rate. It features default-high outputs, 7ns typical propagation delay at 3.3V, and 50kV/μs CMTI - designed for isolated RS-485/RS-232 transceiver interfaces in automotive BMS and inverters.
For engineers reviewing the MAX22291CASA/V+T datasheet, MAX22291CASA/V+T pinout, MAX22291CASA/V+T application, or MAX22291CASA/V+T equivalent, this page delivers verified electrical specs, AEC-Q100 qualification status, isolation barrier performance, supply-voltage flexibility (1.71V–5.5V per side), and real-world design implications for high-noise industrial and automotive signal isolation.
Technical Context
The MAX22291CASA/V+T implements two independent unidirectional isolation channels with opposite-direction data flow: IN1→OUT2 (Side A to Side B) and IN2→OUT1 (Side B to Side A), enabling full-duplex transceiver isolation. Its proprietary capacitive isolation technology provides reinforced insulation certified to UL1577 and pending VDE 0884-11.
Each side supports independent 1.71V–5.5V supplies (VDDA/GNDA and VDDB/GNDB), enabling level translation across domains. Undervoltage lockout (1.6V threshold, 45mV hysteresis) forces outputs to default-high state during supply fault, ensuring fail-safe behavior in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating (VISO) | 3000VRMS for 60s - meets reinforced insulation requirements for functional safety in automotive and industrial systems |
| Working Voltage (VIOWM) | 445VRMS continuous - enables long-term operation in high-bus-voltage applications like 400V BMS stacks |
| Max Data Rate | 200Mbps - supports high-speed isolated SPI, CAN FD, and RS-485 links without timing bottlenecks |
| Propagation Delay (tPLH/tPHL) | 7ns typ at 3.3V - minimizes system latency in real-time motor control and battery monitoring loops |
| CMTI | 50kV/μs typ - rejects fast common-mode transients from IGBT switching in inverters and chargers |
| Supply Range (per side) | 1.71V to 5.5V - allows direct interfacing with 1.8V microcontrollers and 3.3V/5V peripherals without external level shifters |
| Power @ 1Mbps | 0.78mW/channel at 1.8V - reduces thermal load in space-constrained automotive ECUs and portable test equipment |
Pinout & Package
MAX22291CASA/V+T uses an 8-pin narrow-body SOIC package (S8MS+24 outline, 4mm creepage/clearance) with reinforced insulation barrier between Side A (pins 1–4) and Side B (pins 5–8).
| 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 | Logic input 1 on Side A | Drives OUT2 on Side B; accepts 1.71V–5.5V logic levels independent of VDDB |
| 3 IN2 | Logic input 2 on Side A | Drives OUT1 on Side B; shares same voltage domain as IN1 but isolated signal path |
| 4 GNDA | Side A ground reference | Must be isolated from GNDB; forms one side of reinforced dielectric barrier |
| 5 GNDB | Side B ground reference | Must be isolated from GNDA; completes galvanic separation for noise immunity |
| 6 OUT2 | Logic output 2 on Side B | Driven by IN1; push-pull output eliminates need for external pull-ups in RS-485 DE/RE control |
| 7 IN1 | Logic input 1 on Side B | Drives OUT1 on Side A; enables bidirectional communication across isolation barrier |
| 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 |
|---|---|
| AEC-Q100 qualified (/V suffix) | Rated for -40°C to +125°C ambient operation with 100% production testing at both temperatures - suitable for under-hood automotive use |
| Reinforced isolation | UL1577 certified and VDE 0884-11 pending; 6250VPK surge rating enables robust protection against lightning-induced transients in EV chargers |
| Default-high outputs | Ensures known logic state during power-up/power-down or open-input conditions - critical for fail-safe RS-232 TX enable control |
| Low jitter clock transfer | 7.5ps RMS clock jitter enables precise timing in isolated ADC sampling clocks and PWM feedback loops |
| Independent dual supplies | VDDA and VDDB operate from 1.71V–5.5V independently - supports mixed-voltage systems like 1.8V MCU + 5V analog front-end |
Applications
| Automotive Battery Management System (BMS) | Industrial Isolated RS-485 Transceiver |
|---|---|
Use Scenario: Isolating cell monitor IC communication lines between high-voltage battery stack (400–800V) and low-voltage MCU domain. IC Role / Device Role / Timing Role: MAX22291CASA/V+T provides bidirectional signal isolation for daisy-chained UART links, with IN1→OUT2 carrying commands from MCU to slave monitors and IN2→OUT1 returning telemetry. Use Value: Reinforced 3kVRMS isolation prevents ground-loop currents and protects MCU from high-voltage faults; 200Mbps headroom accommodates future firmware updates with higher baud rates. |
Use Scenario: Isolating RS-485 transceiver (e.g., MAX3485) control lines (DE/RE) and data lines (RO/DI) in factory automation PLCs exposed to 2kV EFT noise. IC Role / Device Role / Timing Role: MAX22291CASA/V+T isolates both direction-control signals and full-duplex data paths, eliminating shared ground references between controller and bus nodes. Use Value: 50kV/μs CMTI suppresses noise-induced glitches on DE/RE pins; default-high outputs ensure transceiver remains disabled during MCU reset sequences. |
| EV Onboard Charger (OBC) Control Interface | Isolated SPI for High-Voltage Sensor Monitoring |
Use Scenario: Isolating digital control signals between 3.3V MCU and SiC gate driver ICs operating at 600V+ DC-link potential in OBC PFC and inverter stages. IC Role / Device Role / Timing Role: MAX22291CASA/V+T transfers PWM enable/disable and fault feedback across isolation barrier, with IN1→OUT2 carrying EN signals and IN2→OUT1 returning FAULT status. Use Value: 7ns propagation delay ensures tight timing alignment between control and feedback; 445VRMS working voltage supports continuous operation in 650V-class OBC designs. |
Use Scenario: Isolating SPI clock, MOSI, MISO, and CS lines between 1.8V precision ADC (e.g., ADS131M04) and host MCU in HV battery pack current/voltage sensing modules. IC Role / Device Role / Timing Role: MAX22291CASA/V+T routes all four SPI signals across barrier using two devices (one for clock/MOSI, one for MISO/CS), maintaining full-duplex timing integrity. Use Value: 200Mbps capability exceeds typical SPI speeds (≤50MHz), preserving setup/hold margins; independent 1.8V/3.3V supplies match ADC and MCU I/O voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8621ED-B-IS | 2-channel, 200Mbps, default-high, 5kVRMS isolation, 3.75kV surge, SOIC-8 package | Not AEC-Q100 qualified; lacks automotive temperature range guarantee (-40°C to +105°C only) | Prefer MAX22291CASA/V+T for automotive BMS where AEC-Q100 and +125°C operation are mandatory |
| ISO6721DR | 2-channel, 50Mbps, default-low, 5kVRMS, SOIC-8, TI's capacitive isolation | Lower speed limits use in high-bandwidth interfaces; default-low conflicts with RS-485 DE/RE active-high logic | Choose MAX22291CASA/V+T when 200Mbps, default-high, and AEC-Q100 compliance are required simultaneously |
Compared with SI8621ED-B-IS and ISO6721DR, the MAX22291CASA/V+T uniquely combines AEC-Q100 qualification, 200Mbps speed, default-high outputs, and 445VRMS working voltage - making it the only drop-in solution for automotive-grade isolated transceiver interfaces requiring full temperature and safety certification.
Availability
MAX22291CASA/V+T is available at Aetrix Electronics and suitable for automotive battery management systems, EV onboard chargers, and industrial isolated RS-485 networks requiring stable component supply, long lifecycle support, and traceable sourcing.
Supply support for MAX22291CASA/V+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 (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, serving automotive, industrial, and communications markets.
The MAX22291 belongs to Analog Devices' reinforced digital isolator product line, engineered specifically for safety-critical automotive and industrial applications demanding high-speed, low-power, and certified galvanic isolation across noisy high-voltage domains.
FAQ
What does the "/V" suffix in MAX22291CASA/V+T indicate?
The "/V" suffix confirms AEC-Q100 qualification for automotive applications. MAX22291CASA/V+T undergoes 100% production testing at both +25°C and +125°C, guarantees operation from -40°C to +125°C, and meets stress-test requirements for vibration, thermal cycling, and humidity. This makes MAX22291CASA/V+T suitable for under-hood and battery-pack environments where standard industrial isolators would fail qualification.
How does MAX22291CASA/V+T differ from MAX22290 in pinout and functionality?
MAX22291CASA/V+T has cross-connected channels: IN1 (pin 2) drives OUT2 (pin 6), and IN2 (pin 3) drives OUT1 (pin 7), enabling full-duplex isolation. In contrast, MAX22290 routes both channels unidirectionally (IN1→OUT1, IN2→OUT2). The pinout differs - MAX22291CASA/V+T places OUT1 on pin 7 and IN1 on pin 7 of Side B, while MAX22290 places OUT1 on pin 2. PCB layout is not interchangeable.
Does MAX22291CASA/V+T support level shifting between different logic voltages?
Yes. MAX22291CASA/V+T supports independent 1.71V–5.5V supplies on each side: VDDA (pin 1) sets Side A logic levels, and VDDB (pin 8) sets Side B levels. For example, a 1.8V MCU can drive IN1/IN2 while VDDB = 3.3V powers OUT1/OUT2 to interface with a 3.3V RS-485 transceiver - no external level shifters needed. This is confirmed in the Electrical Characteristics table and Applications Information section.
What safety certifications does MAX22291CASA/V+T hold?
MAX22291CASA/V+T is UL1577 certified (File E351759) for 3000VRMS isolation and cUL listed to CSA Bulletin 5A. VDE 0884-11 certification for reinforced insulation is pending. It meets IEC 60747-5-5 for VIOWM (445VRMS), VIORM (630VPK), and VIOSM (6250VPK surge). These ratings are validated per Table 1 and Safety Regulatory Approvals section of the datasheet.
Can MAX22291CASA/V+T replace optocouplers in existing designs?
Yes - with design review. MAX22291CASA/V+T offers superior speed (200Mbps vs. ≤10Mbps for most optos), lower power (0.78mW/channel vs. 5–15mW), tighter timing (7ns delay vs. 100+ ns), and longer lifetime (no LED degradation). However, pinout and supply requirements differ: optocouplers often use single supply and open-collector outputs, while MAX22291CASA/V+T requires dual supplies and push-pull outputs. Layout and decoupling must follow the datasheet's Layout Considerations section.
MAX22291CASA/V+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:
- CAN, RS232, RS422, RS485, SPI
- 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):
- 50kV/µs (Typ)
- Data Rate:
- 200Mbps
- Propagation Delay tpLH / tpHL (Max):
- 9.5ns, 9.9ns
- Pulse Width Distortion (Max):
- 2ns
- Rise / Fall Time (Typ):
- 0.8ns, 1ns (Max)
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX22291CASA/V+T FAQ
1.How can I place an order for MAX22291CASA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22291CASA/V+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 MAX22291CASA/V+T reliable?
The price and inventory of MAX22291CASA/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22291CASA/V+T is usually 5 days.
3.What payment methods are accepted for MAX22291CASA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22291CASA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22291CASA/V+T?
MAX22291CASA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22291CASA/V+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 MAX22291CASA/V+T?
For technical support, including MAX22291CASA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22291CASA/V+T requirements.
6.How does Aetrix verify that MAX22291CASA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX22291CASA/V+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 MAX22291CASA/V+T meets industry standards.
7.What is the process for return or replacement of MAX22291CASA/V+T?
All MAX22291CASA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22291CASA/V+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 MAX22291CASA/V+T part is unused and in its original packaging.
Return procedure for MAX22291CASA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22291CASA/V+T 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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