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Texas Instruments ISO7221MDG4
- Part No.:
- ISO7221MDG4
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7221MDG4.pdf
- Description:
- DGTL ISO 2500VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
ISO7221MDG4 from Texas Instruments is a dual-channel CMOS digital isolator with 150Mbps signaling rate, 1ns max channel-to-channel output skew, and 1ns max pulse-width distortion. It features independent 2.8V/3.3V/5V dual-supply operation (VCCI/VCCO), 4kV ESD protection, and operates across –40°C to +125°C for industrial automation interfaces.
For engineers reviewing the ISO7221MDG4 datasheet, ISO7221MDG4 pinout, ISO7221MDG4 application, or ISO7221MDG4 equivalent, this page delivers verified electrical specs, isolation barrier performance (4000VPK per VDE), failsafe logic-high default behavior, and precise SOIC-8 pin mapping for Modbus/Profibus data bus isolation design.
Technical Context
The ISO7221MDG4 uses TI's silicon-dioxide (SiO₂) isolation barrier to provide galvanic separation up to 4000VPK (per VDE 0884-17), with differential signal transmission and periodic DC-refresh pulses every 4μs to maintain output state during input power loss. Its M-option variant employs CMOS VCC/2 input thresholds and omits the input noise filter found in A/B/C variants.
It supports asymmetric supply configurations (e.g., 5V on input side, 3.3V on output side), delivers 4mA CMOS outputs, tolerates 5V inputs at 2.8V/3.3V supplies, and achieves 1ns typical jitter at 150Mbps - enabled by low-skew internal flip-flop architecture and balanced signal translation across the barrier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Signaling Rate | 150Mbps - supports high-speed serial protocols like Profibus DP and real-time servo control loops without timing bottlenecks. |
| Channel-to-Channel Output Skew | ≤1ns max - ensures synchronized dual-channel output timing critical for differential signaling and clock/data recovery. |
| Pulse-Width Distortion (PWD) | ≤1ns max - preserves duty cycle integrity for PWM-driven systems and accurate edge-aligned communication. |
| Common-Mode Transient Immunity (CMTI) | 50kV/μs typical - maintains signal integrity in noisy factory environments with fast-switching motor drives or inverters. |
| Isolation Voltage (VIOTM) | 4000VPK - certified per DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation in safety-critical industrial equipment. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive subsystems and high-ambient industrial PLC modules. |
| Failsafe Output Behavior | Logic-high default on input power loss - prevents undefined states in safety-monitored control paths. |
Pinout & Package
ISO7221MDG4 is housed in an 8-pin SOIC (D package) with 4.90mm × 3.91mm body size and 4.9mm × 6mm overall footprint. The ISO7221x orientation places INB and OUTA on opposite sides of the isolation barrier to simplify PCB routing between isolated domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA | Input, Channel A | CMOS VCC/2 threshold input; accepts 5V-tolerant signals when VCCI = 2.8V or 3.3V. |
| INB | Input, Channel B | Independent second input with identical CMOS threshold and 5V tolerance. |
| VCC1 | Input-Side Power Supply | Supplies input logic and isolation transmitter; supports 2.8V/3.3V/5V operation. |
| GND1 | Input-Side Ground | Reference for VCC1 and INA/INB; must be isolated from GNDO. |
| OUTA | Output, Channel A | 4mA CMOS output; driven high during failsafe condition if input power is lost. |
| OUTB | Output, Channel B | Independent output with matched propagation delay and skew to OUTA. |
| GND2 | Output-Side Ground | Reference for VCC2 and OUTA/OUTB; forms isolated domain with VCC2. |
| VCC2 | Output-Side Power Supply | Supplies output logic and isolation receiver; independently configurable from VCC1. |
Key Features
| Feature | Design Value |
|---|---|
| 150Mbps signaling rate with 1ns PWD | Enables deterministic real-time communication in motion control and high-speed data acquisition without retransmission overhead. |
| CMOS VCC/2 input thresholds (M-option) | Eliminates input noise filtering, reducing propagation delay to 6–16ns and supporting clean, fast edge transitions. |
| Dual independent supply rails (VCCI/VCCO) | Allows level-shifting between 2.8V microcontrollers and 5V fieldbus transceivers without external level translators. |
| Failsafe logic-high output on input power loss | Provides predictable default state for safety interlocks and watchdog monitoring in industrial safety circuits. |
| 4000VPK isolation rating (VDE 0884-17) | Meets reinforced insulation requirements for functional safety in PLC backplanes and motor drive gate driver interfaces. |
Applications
| Factory Automation Interface | Servo Control Interface |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in Modbus RTU networks within programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel isolator separating controller-side logic from field-side bus drivers while maintaining full-duplex timing alignment. Use Value: 1ns max channel skew ensures simultaneous enable/disable of half-duplex bus direction control, preventing bus contention. |
Use Scenario: Signal isolation between FPGA-based motion controller and three-phase inverter gate drivers. IC Role / Device Role / Timing Role: Transmitting PWM and fault feedback signals across isolation boundary with sub-10ns propagation delay matching. Use Value: 150Mbps capability supports high-resolution position encoder feedback (e.g., EnDat 2.2) without bandwidth limitation. |
| Data Acquisition System | Computer Peripheral Interface |
|
Use Scenario: Isolating analog front-end ADC SPI interface from host MCU in medical-grade patient monitoring equipment. IC Role / Device Role / Timing Role: Galvanically isolating serial clock, data, and chip-select lines to break ground loops and reject common-mode noise. Use Value: 50kV/μs CMTI suppresses switching noise from nearby power converters, preserving 16-bit ADC accuracy. |
Use Scenario: USB-to-RS232 converter module requiring isolation between PC-side logic and legacy serial port circuitry. IC Role / Device Role / Timing Role: Isolating TX/RX data paths and handshaking signals (RTS/CTS) while maintaining UART timing integrity. Use Value: Independent VCCI/VCCO rails allow 3.3V USB PHY interfacing and 5V RS232 line driver operation in same design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7221CDR | 25Mbps max rate; TTL input thresholds with noise filter; 2ns PWD; 21–42ns propagation delay. | Better noise immunity in low-speed industrial sensors; unsuitable for >25Mbps protocols like high-speed Profibus. | Select ISO7221CDR only when cost sensitivity outweighs speed requirement and noise environment demands filtering. |
| ADUM1201BRZ | 100Mbps max; 3ns PWD; 15–35ns propagation delay; 2.5kV RMS isolation; different pinout (SOIC-8 but channel orientation differs). | Limited to lower-speed isolated I²C or GPIO; lacks failsafe default and VDE 0884-17 certification for safety-critical use. | Choose ADUM1201BRZ only for non-safety-rated consumer or lab equipment where 100Mbps suffices and layout allows pinout adaptation. |
Compared with ISO7221CDR and ADUM1201BRZ, the ISO7221MDG4 uniquely combines 150Mbps speed, VDE-certified 4000VPK isolation, failsafe logic-high default, and CMOS-threshold low-delay operation - making it the only option qualified for high-bandwidth, safety-compliant industrial fieldbus and servo interfaces.
Availability
ISO7221MDG4 is available at Aetrix Electronics and suitable for factory automation interfaces, servo control systems, and data acquisition modules requiring stable component supply, long-term lifecycle support, and compliance with IEC 61010-1 and IEC 62368-1 standards.
Supply support for ISO7221MDG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability interface solutions for industrial, automotive, and communications markets.
The ISO722x family was designed specifically for robust galvanic isolation in harsh industrial environments - delivering high-speed, low-skew, safety-certified signal transfer between microcontrollers and field-side peripherals.
FAQ
What is the maximum signaling rate supported by the ISO7221MDG4?
The ISO7221MDG4 supports a maximum signaling rate of 150Mbps, verified under 5V/5V supply conditions with PRBS NRZ data patterns. This enables use in high-speed industrial protocols such as Profibus DP and real-time Ethernet variants requiring deterministic latency and minimal jitter.
Does the ISO7221MDG4 have a failsafe output mode, and how does it behave?
Yes, the ISO7221MDG4 implements a failsafe output mode: if the input-side power (VCC1) is lost or the input is unpowered, the device drives both outputs to a logic-high state after ≤3μs. This behavior is inherent to its internal DC-refresh architecture and applies to ISO7221MDG4 regardless of supply configuration.
What isolation certifications does the ISO7221MDG4 hold?
The ISO7221MDG4 is certified to DIN EN IEC 60747-17 (VDE 0884-17) for 4000VPK transient isolation voltage, UL 1577 for 2500VRMS withstand voltage, and IEC 61010-1 and IEC 62368-1 for end-equipment safety - all documented in TI's official certification files for ISO7221MDG4.
Can ISO7221MDG4 operate with mismatched supply voltages, such as 5V on VCC1 and 3.3V on VCC2?
Yes, ISO7221MDG4 fully supports asymmetric supply operation: VCC1 may be 5V while VCC2 is 3.3V (or vice versa), with verified performance in electrical characteristics tables (Sections 5.10 and 5.11). Input pins remain 5V-tolerant even when VCC1 = 2.8V or 3.3V, enabling flexible level-shifting.
How does the M-option input threshold differ from A/B/C options in ISO7221MDG4?
The ISO7221MDG4 uses CMOS VCC/2 input thresholds (M-option), unlike A/B/C variants that use TTL thresholds with integrated noise filters. This eliminates ~20ns of input filtering delay, reduces PWD to ≤1ns, and lowers propagation delay to 6–16ns - at the expense of reduced noise margin in electrically noisy environments.
ISO7221MDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 16ns, 16ns
- Pulse Width Distortion (Max):
- 1ns
- Rise / Fall Time (Typ):
- 1ns, 1ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7221MDG4 FAQ
1.How can I place an order for ISO7221MDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7221MDG4 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 ISO7221MDG4 reliable?
The price and inventory of ISO7221MDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7221MDG4 is usually 5 days.
3.What payment methods are accepted for ISO7221MDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7221MDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7221MDG4?
ISO7221MDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7221MDG4 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 ISO7221MDG4?
For technical support, including ISO7221MDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7221MDG4 requirements.
6.How does Aetrix verify that ISO7221MDG4 is sourced from the original manufacturer or authorized distributors?
All ISO7221MDG4 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 ISO7221MDG4 meets industry standards.
7.What is the process for return or replacement of ISO7221MDG4?
All ISO7221MDG4 units undergo pre-shipment inspection (PSI). If there is an issue with ISO7221MDG4, 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 ISO7221MDG4 part is unused and in its original packaging.
Return procedure for ISO7221MDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7221MDG4 Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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