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Texas Instruments ISO7420MDR
- Part No.:
- ISO7420MDR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7420MDR.pdf
- Description:
- DGTL ISO 2500VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
ISO7420MDR from Texas Instruments is a dual-channel digital isolator with galvanic isolation up to 2500 VRMS for 1 minute, TTL-compatible input thresholds, and independent 3.3-V or 5-V supplies on input (VCCI/GNDI) and output (VCCO/GNDO) sides. It delivers 1 Mbps signaling rate, 9 ns typical propagation delay, and operates across –40°C to 125°C for industrial motor control and isolated power supply interfaces.
For engineers reviewing the ISO7420MDR datasheet, ISO7420MDR pinout, ISO7420MDR application, or ISO7420MDR equivalent, key selection criteria include channel independence, 50-kV/μs CMTI, SOIC-8 narrow-body package compatibility, and level translation between 3.3-V and 5-V domains in servo drive feedback loops and fieldbus nodes.
Technical Context
The ISO7420MDR implements two unidirectional isolation channels separated by a silicon dioxide (SiO₂) barrier, each with dedicated logic buffers and independent supply domains. It supports bidirectional level translation via separate VCCI/VCCO rails and tolerates 5-V inputs when powered from 3.3 V on the input side.
No internal refresh circuitry or data encoding is used; signal integrity relies on high CMTI (50 kV/μs typical), low skew (300 ps typical), and guaranteed pulse width distortion <1 ns over temperature, enabling reliable timing in real-time control systems without external filtering for pulses ≥1 μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 VRMS for 1 min per UL 1577; enables safety-critical separation in industrial equipment |
| Signaling Rate | 1 Mbps maximum; supports Modbus RTU and DeviceNet™ data rates without oversampling |
| Propagation Delay | 9 ns typical; ensures sub-10-ns timing alignment between isolated control and feedback paths |
| CMTI | 50 kV/μs typical; rejects fast transients in motor drive gate driver noise environments |
| Supply Voltage Range | VCCI and VCCO independently support 3.15–3.45 V or 4.75–5.25 V; allows mixed-voltage system interfacing |
| Operating Temperature | –40°C to 125°C (M-grade); qualified for under-hood automotive and industrial ambient conditions |
| Input Threshold | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2 V); interoperable with legacy microcontrollers and FPGAs |
Pinout & Package
Narrow-body SOIC-8 package (4.90 mm × 3.91 mm), surface-mount, RoHS-compliant, with creepage/clearance meeting DIN V VDE V 0884-10 and IEC 61010-1 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCI | Input-side power supply | Provides 3.3-V or 5-V bias for INx inputs and input buffer; decoupling required near pin |
| GNDI | Input-side ground reference | Return path for VCCI; must be isolated from GNDO to maintain galvanic barrier integrity |
| INA | Channel A input | TTL-level digital signal entry point; 5-V tolerant when VCCI = 3.3 V |
| INB | Channel B input | Independent second input; no internal cross-talk with INA due to SiO₂ barrier |
| VCCO | Output-side power supply | Bias for OUTx drivers; enables level-shifted output at 3.3 V or 5 V regardless of VCCI |
| GNDO | Output-side ground reference | Return for VCCO; forms isolated domain with VCCO, electrically separated from GNDI |
| OUTA | Channel A output | Isolated replica of INA; drives 15-pF load at 1 Mbps with 9 ns delay |
| OUTB | Channel B output | Isolated replica of INB; matched propagation delay to OUTA ensures <300 ps inter-channel skew |
Key Features
| Feature | Design Value |
|---|---|
| Dual unidirectional channels | Two independent SiO₂-isolated signal paths enable simultaneous control and status feedback without shared timing constraints |
| 3.3-V/5-V level translation | Allows direct interface between 3.3-V MCU GPIO and 5-V PLC I/O modules without external level shifters |
| Low power consumption | 1.1 mA typical ICC per channel at 3.3 V enables thermal-limited designs in dense PCB layouts |
| High transient immunity | 50 kV/μs CMTI prevents false triggering during IGBT switching events in motor inverters |
| Wide temperature operation | –40°C to 125°C M-grade qualification supports deployment in engine control units and solar inverters |
Applications
| Industrial Fieldbus Isolation | Motor Control Feedback |
|---|---|
Use Scenario: Isolating RS-485 transceivers in Profibus DP slave nodes to prevent ground loop currents. IC Role / Device Role / Timing Role: Dual-channel isolator separating controller-side UART signals (INA/INB) from bus-side differential drivers (OUTA/OUTB). Use Value: Maintains 1 Mbps data integrity while blocking >2500 VRMS fault voltages between factory floor and control cabinet grounds. | Use Scenario: Transmitting encoder quadrature signals and PWM fault flags from motor driver stage to MCU. IC Role / Device Role / Timing Role: Providing matched-delay isolation for A/B phase and index pulses to preserve edge alignment. Use Value: 9 ns propagation delay and <300 ps skew ensure position calculation accuracy within ±1 encoder count at 100 kHz update rates. |
| Isolated Power Supply Monitoring | Servo Drive Interface |
Use Scenario: Monitoring overvoltage and overtemperature alerts from isolated DC-DC converters in telecom rectifiers. IC Role / Device Role / Timing Role: Level-translating fault signals from 5-V analog monitoring ICs to 3.3-V microcontroller GPIOs. Use Value: 5-V-tolerant inputs eliminate external resistive dividers; 125°C rating matches converter thermal envelope. | Use Scenario: Isolating direction and enable commands from motion controller to gate driver IC in CNC axis drives. IC Role / Device Role / Timing Role: Unidirectional isolation of digital control lines with precise timing to avoid shoot-through during state transitions. Use Value: Sub-10 ns delay and 50 kV/μs CMTI prevent command corruption during high-dV/dt IGBT switching. |
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 |
|---|---|---|---|
| ADUM1200ARZ | 100 Mbps max rate; 35 ns propagation delay; 2.5 kV RMS isolation; uses iCoupler® magnetic coupling | Higher speed but lower isolation rating; suited for non-safety-critical data links rather than industrial safety barriers | Select when bandwidth >1 Mbps is required and UL 2500 VRMS is not mandated |
| SI8620ED-IS | 150 Mbps max rate; 13 ns propagation delay; 5 kV RMS isolation; capacitive coupling; 2.5–5.5 V supply range | Wider supply range and higher CMTI (75 kV/μs); lacks M-grade temp rating (only –40°C to 105°C) | Select for high-noise environments needing >50 kV/μs immunity where extended temperature is not required |
Compared with ADUM1200ARZ and SI8620ED-IS, the ISO7420MDR offers the highest certified isolation voltage (2500 VRMS) and M-grade temperature range (–40°C to 125°C), making it uniquely suitable for safety-critical industrial motor drives where regulatory compliance and thermal robustness are mandatory.
Availability
ISO7420MDR is available at Aetrix Electronics and suitable for industrial fieldbus nodes, servo control interfaces, and isolated power supply monitoring requiring stable component supply and long-term lifecycle assurance.
Supply support for ISO7420MDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ISO742x family was designed specifically for replacing optocouplers in high-reliability industrial automation systems, emphasizing low power, precise timing, and regulatory-certified isolation integrity over decades of operation.
FAQ
What is the maximum signaling rate supported by the ISO7420MDR?
The ISO7420MDR supports a maximum signaling rate of 1 Mbps as specified in the official Texas Instruments datasheet SLLS984I. This rate is guaranteed across the full operating temperature range of –40°C to 125°C and applies to both isolation channels independently. Pulse widths shorter than 1 μs may require external filtering to suppress spurious signals, per design note in Section 1 of the datasheet.
Does the ISO7420MDR support level translation between 3.3-V and 5-V logic domains?
Yes, the ISO7420MDR supports bidirectional level translation: its inputs are 5-V tolerant when VCCI = 3.3 V, and outputs can be driven at either 3.3 V or 5 V depending on VCCO. This allows direct interfacing between 3.3-V microcontrollers and 5-V industrial I/O peripherals without external level-shifting components, as confirmed in the Features and Description sections of the ISO7420MDR datasheet.
What isolation certifications does the ISO7420MDR hold?
The ISO7420MDR is certified to 2500 VRMS isolation for 1 minute per UL 1577, 4242 VPK per DIN V VDE V 0884-10, and meets CSA Component Acceptance Notice 5A, IEC 60950-1, and IEC 61010-1 standards. These certifications are explicitly listed in the Features section of the ISO7420MDR datasheet and apply to the SOIC-8 package variant.
What is the propagation delay and channel-to-channel skew of the ISO7420MDR?
The ISO7420MDR has a typical propagation delay of 9 ns and typical channel-to-channel skew of 300 ps, both measured under standard conditions (VCC = 3.3 V or 5 V, TA = 25°C). These values are specified in the Features table and validated across temperature in the Switching Characteristics section of the ISO7420MDR datasheet.
Can the ISO7420MDR operate with different supply voltages on input and output sides?
Yes, the ISO7420MDR supports independent supply configurations: VCCI and VCCO may each be set to 3.3 V or 5 V, including mixed combinations (e.g., VCCI = 3.3 V, VCCO = 5 V). This capability is documented in the Features list and Electrical Characteristics tables (Sections 6.5–6.7) of the ISO7420MDR datasheet, enabling flexible system-level voltage domain partitioning.
ISO7420MDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 14ns, 14ns
- Pulse Width Distortion (Max):
- 3.7ns
- Rise / Fall Time (Typ):
- 1ns, 1ns
- Voltage - Supply:
- 3.15V ~ 3.45V, 4.75V ~ 5.25V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7420MDR FAQ
1.How can I place an order for ISO7420MDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7420MDR 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 ISO7420MDR reliable?
The price and inventory of ISO7420MDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7420MDR is usually 5 days.
3.What payment methods are accepted for ISO7420MDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7420MDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7420MDR?
ISO7420MDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7420MDR 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 ISO7420MDR?
For technical support, including ISO7420MDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7420MDR requirements.
6.How does Aetrix verify that ISO7420MDR is sourced from the original manufacturer or authorized distributors?
All ISO7420MDR 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 ISO7420MDR meets industry standards.
7.What is the process for return or replacement of ISO7420MDR?
All ISO7420MDR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7420MDR, 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 ISO7420MDR part is unused and in its original packaging.
Return procedure for ISO7420MDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7420MDR Tags
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ISO7741FDWR
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