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Texas Instruments ISO7420FEDR
- Part No.:
- ISO7420FEDR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7420FEDR.pdf
- Description:
- DGTL ISO 2500VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
ISO7420FEDR from Texas Instruments is a dual-channel, unidirectional digital isolator with SiO₂ capacitive isolation barrier, 2500 VRMS UL rating, 7 ns typical propagation delay, and default-low fail-safe output behavior. It supports 3.3-V/5-V level translation across isolated domains and operates from –40°C to 125°C for industrial motor control and servo interface applications.
For engineers reviewing the ISO7420FEDR datasheet, ISO7420FEDR pinout, ISO7420FEDR application, or ISO7420FEDR equivalent, this page delivers verified electrical specs, SOIC-8 terminal mapping, fail-safe timing behavior, and direct alternatives for optocoupler replacement in high-noise industrial data buses.
Technical Context
The ISO7420FEDR implements two independent, input-to-output unidirectional channels separated by a silicon dioxide (SiO₂) capacitive isolation barrier rated for 2500 VRMS per UL 1577 and 4242 VPK per VDE. Each channel features TTL-compatible input thresholds and 5-V-tolerant inputs when supplied at 3.3 V.
It lacks an integrated noise filter-enabling fast 7 ns typical propagation delay-but requires external layout care for CMTI robustness. The 'F' suffix confirms default-low output state during input-side power loss, with tfs = 6 μs fail-safe delay measured per Figure 17 of SLLSE45F.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 VRMS (1 min, UL 1577); 4242 VPK (VDE V 0884-10) - enables reinforced insulation in safety-critical industrial systems |
| Propagation Delay | 7 ns typical (VCC = 5 V) - supports >50 Mbps signaling without added latency in real-time control loops |
| Supply Range | 3.0 V to 5.5 V on both sides - allows mixed-voltage domain interfacing (e.g., 3.3-V MCU to 5-V actuator) |
| Fail-Safe Output | Default-low on input power loss - prevents undefined states in motor gate drivers or relay controllers |
| CMTI | 25–50 kV/μs typical - rejects fast transients common in motor drives and switch-mode power supplies |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive subsystems and industrial PLC backplanes |
| Power Consumption | 1.4 mA per channel at 1 Mbps (3.3-V supply) - reduces thermal load in dense isolation arrays |
Pinout & Package
Narrow-body SOIC-8 package (4.90 mm × 3.91 mm), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCCI) | Input-side power supply | Supplies logic and input buffer circuitry; accepts 3.0–5.5 V |
| 2 (INA) | Channel A input | TTL-compatible digital input; 5-V tolerant when VCCI = 3.3 V |
| 3 (INB) | Channel B input | Independent second input; same electrical specs as INA |
| 4 (GNDI) | Input-side ground | Reference return for VCCI and input signals; galvanically isolated from GNDO |
| 5 (GNDO) | Output-side ground | Reference return for VCCO and output signals; isolated from GNDI |
| 6 (OUTB) | Channel B output | CMOS output driving isolated side; default-low if VCCI fails |
| 7 (OUTA) | Channel A output | CMOS output; matches OUTB timing and drive strength |
| 8 (VCCO) | Output-side power supply | Supplies output buffers; independent voltage domain from VCCI |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive SiO₂ Isolation Barrier | Enables >25-year lifetime and eliminates LED aging issues inherent in optocouplers |
| Unidirectional Dual Channel (ISO7420) | Both channels flow input→output only - simplifies signal routing in master-slave bus architectures |
| Fail-Safe Default-Low ('F' suffix) | Guarantees known low-state output during VCCI brownout - critical for disabling power stages safely |
| 3.3-V/5-V Level Translation | Allows direct interface between low-voltage microcontrollers and higher-voltage peripherals without external level shifters |
| No Integrated Noise Filter | Maintains sub-10 ns propagation delay - essential for time-critical feedback paths in servo loops |
Applications
| Industrial FieldBus Isolation | Motor Control Gate Driver Interface |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in Modbus RTU networks exposed to ground potential differences up to 1 kV. IC Role / Device Role / Timing Role: Digital isolator providing bidirectional signal integrity between controller and bus PHY while blocking ground-loop currents. Use Value: Enables reliable communication in factory-floor environments where 50-kV/μs transients occur near variable-frequency drives. |
Use Scenario: Separating PWM signals from an MCU's GPIO pins to IGBT gate driver ICs in a 3-phase inverter stage. IC Role / Device Role / Timing Role: Unidirectional isolator delivering precise, low-skew (<200 ps) PWM edges to isolated half-bridge drivers. Use Value: Prevents shoot-through faults caused by timing skew or ground bounce during high-dV/dt switching events. |
| Servo Control Feedback Loop | Programmable Logic Controller (PLC) I/O Module |
|
Use Scenario: Isolating encoder quadrature A/B signals and index pulse from a servo motor back to the motion controller. IC Role / Device Role / Timing Role: Dual-channel isolator preserving edge alignment between channels for accurate position decoding. Use Value: Maintains <1 ns channel-to-channel skew to avoid miscounting pulses at >10 MHz encoder rates. |
Use Scenario: Providing digital input isolation for 24-V DC field sensors (e.g., proximity switches) connected to a PLC CPU backplane. IC Role / Device Role / Timing Role: Input-side powered isolator converting 24-V logic to 3.3-V MCU levels with fail-safe default-low behavior. Use Value: Ensures safe deactivation of downstream logic when field wiring is disconnected or power fails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7420EDR | No 'F' suffix → default-high fail-safe output; otherwise identical pinout, specs, and SOIC-8 package | Preferred where active-high enable or reset is required after power loss (e.g., latched safety relays) | Select ISO7420EDR only if system logic expects high-state default on fault; verify fail-safe behavior matches safety architecture. |
| ADUM1200ARZ | 2.5 kV RMS isolation; 10 ns max propagation delay; uses iCoupler magnetic isolation instead of SiO₂ capacitive | Better suited for medical-grade isolation but lower CMTI (25 kV/μs) and no 125°C rating | Choose ADUM1200ARZ only for cost-sensitive, non-automotive designs requiring UL certification but not VDE or extended temperature range. |
Compared with ISO7420EDR and ADUM1200ARZ, the ISO7420FEDR uniquely combines VDE-certified 4242 VPK isolation, 125°C operation, and guaranteed default-low output-making it the only option qualified for functional safety in industrial servo amplifiers and EV battery management interfaces.
Availability
ISO7420FEDR is available at Aetrix Electronics and suitable for industrial motor control, servo interface, PLC I/O modules, and battery pack monitoring systems requiring stable component supply across multi-year production cycles.
Supply support for ISO7420FEDR 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 components for industrial, automotive, and communications markets.
The ISO742x family was designed specifically to replace optocouplers in high-speed, high-noise industrial automation systems-emphasizing low propagation delay, long-term reliability, and regulatory compliance across global safety standards.
FAQ
What is the fail-safe behavior of the ISO7420FEDR during input power loss?
The ISO7420FEDR features a default-low fail-safe output: when VCCI is removed or drops below operating threshold, both OUTA and OUTB transition to and hold a logic-low state within 6 μs (tfs). This behavior is intrinsic to the 'F' suffix variant and ensures predictable shutdown in motor gate drivers and safety interlocks. The ISO7420FEDR does not require external pull-down resistors to guarantee this state.
Does the ISO7420FEDR support level translation between 3.3-V and 5-V domains?
Yes, the ISO7420FEDR supports true bidirectional level translation: its inputs are 5-V tolerant when VCCI = 3.3 V, and outputs swing rail-to-rail relative to VCCO (3.3 V or 5 V). For example, a 3.3-V MCU can drive INA/INB while OUTA/OUTB drive 5-V logic on the isolated side-no external level shifters needed. This capability is confirmed in Sections 6.5–6.8 of the ISO7420FEDR datasheet.
What isolation certifications apply to the ISO7420FEDR?
The ISO7420FEDR is certified to UL 1577 (2500 VRMS, 1 minute), VDE V 0884-10 (4242 VPK), CSA Component Acceptance Notice 5A, and CQC GB4943.1-2011. These approvals cover reinforced insulation for industrial equipment and allow use in mains-connected systems up to 300 V RMS working voltage. All certifications are explicitly listed in the ISO7420FEDR device information table and safety section of SLLSE45F.
Can the ISO7420FEDR be used in automotive applications?
The ISO7420FEDR is qualified for operation from –40°C to 125°C and meets AEC-Q100 stress test requirements for temperature cycling and HAST, making it suitable for under-hood automotive subsystems such as battery disconnect units and 12-V/48-V DC-DC controller interfaces. However, it is not AEC-Q100 Grade 0 qualified; for full automotive qualification, TI recommends the ISO7720FQDWRQ1 variant.
How does the ISO7420FEDR differ from the ISO7421FEDR?
The ISO7420FEDR has both channels configured input-to-output (unidirectional, same direction), whereas the ISO7421FEDR has one channel input-to-output and the other output-to-input (bidirectional channel pairing). Pin assignments differ: INB and OUTA are swapped between the two variants. Using ISO7421FEDR in an ISO7420FEDR design causes signal inversion on one channel and violates functional intent-PCB layout and firmware must be revalidated.
ISO7420FEDR 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:
- 50Mbps
- Propagation Delay tpLH / tpHL (Max):
- 11ns, 11ns
- Pulse Width Distortion (Max):
- 3ns
- Rise / Fall Time (Typ):
- 1.8ns, 1.7ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7420FEDR FAQ
1.How can I place an order for ISO7420FEDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7420FEDR 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 ISO7420FEDR reliable?
The price and inventory of ISO7420FEDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7420FEDR is usually 5 days.
3.What payment methods are accepted for ISO7420FEDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7420FEDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7420FEDR?
ISO7420FEDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7420FEDR 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 ISO7420FEDR?
For technical support, including ISO7420FEDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7420FEDR requirements.
6.How does Aetrix verify that ISO7420FEDR is sourced from the original manufacturer or authorized distributors?
All ISO7420FEDR 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 ISO7420FEDR meets industry standards.
7.What is the process for return or replacement of ISO7420FEDR?
All ISO7420FEDR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7420FEDR, 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 ISO7420FEDR part is unused and in its original packaging.
Return procedure for ISO7420FEDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7420FEDR 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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