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Texas Instruments ISO7021FDR
- Part No.:
- ISO7021FDR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISO7021FDR.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
ISO7021FDR from Texas Instruments is an ultra-low-power, two-channel capacitive digital isolator with 3000VRMS isolation rating, 4Mbps signaling rate, and dual supply operation (1.71V–5.5V per side), used to isolate CMOS/LVCMOS I/Os in power-constrained industrial sensor interfaces and loop-powered transmitters.
For engineers reviewing the ISO7021FDR datasheet, ISO7021FDR pinout, ISO7021FDR application, or ISO7021FDR equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and confirmed alternative options for low-power galvanic isolation in harsh environments.
Technical Context
The ISO7021FDR implements edge-based encoding with ON-OFF keying (OOK) modulation across a double-capacitive SiO₂ barrier, enabling <4.8μA/channel quiescent current at 3.3V while maintaining 3000VRMS UL 1577 isolation. Its architecture includes integrated refresh logic and watchdog timers to ensure DC output state fidelity during signal loss.
Each channel supports independent supply domains (VCC1/VCC2), operates from –55°C to +125°C, and delivers ±100kV/μs typical CMTI with robust system-level ESD (±8kV contact) and low emissions - all in an 8-SOIC package with one forward and one reverse channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3000VRMS per UL 1577 - enables safe separation of hazardous and non-hazardous circuits in industrial field devices |
| Data Rate | Up to 4Mbps - supports high-speed UART, GPIO, and SPI isolation without timing bottlenecks |
| Quiescent Current | 4.8μA per channel at 3.3V - allows battery- or energy-harvesting powered systems to operate >10 years on coin cell |
| CMTI | ±100kV/μs typical - prevents false triggering in noisy motor drives and PLC backplanes |
| Supply Range | 1.71V–1.89V and 2.25V–5.5V per side - permits direct interface with 1.8V microcontrollers and 5V analog front-ends |
| Default Output | Low (F-suffix) - ensures fail-safe shutdown of downstream circuitry upon input power loss |
| Operating Temperature | –55°C to +125°C - qualified for use in outdoor instrumentation and automotive under-hood modules |
Pinout & Package
ISO7021FDR is housed in an industry-standard narrow-body 8-SOIC (D) package (4.90mm × 6.00mm), optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1 | Power supply, side 1 | Supplies isolated input-side logic; accepts 1.71V–5.5V independently of VCC2 |
| OUTA | Output, channel A | Forward-direction output driven by INB; default low on power loss (F-suffix) |
| INB | Input, channel B | Reverse-direction input; accepts CMOS/LVCMOS levels referenced to VCC1 |
| GND1 | Ground, side 1 | Reference return for VCC1 and input-side signals; galvanically separated from GND2 |
| GND2 | Ground, side 2 | Reference return for VCC2 and output-side signals; no electrical connection to GND1 |
| OUTB | Output, channel B | Reverse-direction output driven by INA; default low on power loss (F-suffix) |
| INA | Input, channel A | Forward-direction input; accepts CMOS/LVCMOS levels referenced to VCC2 |
| VCC2 | Power supply, side 2 | Supplies isolated output-side logic; voltage may differ from VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dynamic power | 120μA/channel at 1Mbps (3.3V) - reduces thermal load in sealed enclosures and extends battery life |
| Dual-supply flexibility | Independent 1.71V–5.5V rails per side - eliminates level-shifters when interfacing 1.8V MCU to 3.3V ADC |
| Fail-safe default output | Low-state default (F-suffix) - forces controlled shutdown in safety-critical sensor loops during fault conditions |
| High CMTI immunity | ±100kV/μs typical - maintains data integrity in variable-frequency drives and industrial inverters |
| Integrated refresh logic | 100μs watchdog timer - guarantees output matches input DC state even during static signal conditions |
Applications
| 4–20mA Loop-Powered Transmitters | Factory Automation I/O Modules |
|---|---|
Use Scenario: Isolating analog sensor outputs and digital control lines in explosion-proof field instruments powered solely by 4–20mA loop current. IC Role / Device Role / Timing Role: Galvanic isolator for bidirectional digital control (e.g., HART communication) and status reporting across hazardous/non-hazardous boundaries. Use Value: Enables intrinsic safety certification (IECEx/ATEX) via 3000VRMS isolation and <5μA quiescent draw - preserves loop margin for sensor excitation and signal conditioning. |
Use Scenario: Protecting PLC controller GPIOs and serial interfaces from ground loops, surges, and noise in robotic cell controllers. IC Role / Device Role / Timing Role: Two-channel isolator for separating microcontroller UART (channel A) and digital input monitoring (channel B) from field-side peripherals. Use Value: Delivers ±100kV/μs CMTI and ±8kV ESD protection - eliminates spurious resets and communication errors in electrically noisy factory floors. |
| Low-Power Wireless Sensor Nodes | Industrial Temperature Monitoring Systems |
Use Scenario: Isolating MCU wake-up signals and sensor data paths in battery-operated IIoT nodes deployed in remote locations. IC Role / Device Role / Timing Role: Low-quiescent isolator for enabling/disabling RF transceivers and reading isolated temperature sensors via I²C or SPI. Use Value: 4.8μA/channel standby current extends 10-year battery life targets - critical for maintenance-free deployments in inaccessible infrastructure. |
Use Scenario: Isolating thermocouple amplifier outputs and microcontroller ADC inputs in multi-zone furnace controllers operating up to 125°C ambient. IC Role / Device Role / Timing Role: High-temperature-rated isolator for transmitting digitized temperature readings while blocking ground-referenced noise from heating elements. Use Value: Full –55°C to +125°C operation and 4Mbps data rate support fast sampling of multiple zones without thermal derating or speed compromise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO7021DR | Same package and specs, but default output is high (non-F suffix) | Used where fail-safe requires active-high assertion (e.g., enable lines) | Select ISO7021DR only if system logic requires high-default behavior on power loss |
| ADUM120N0BRZ | 1.8V–5.5V supply, 150Mbps max rate, 0.95mA/ch quiescent at 1Mbps, 2.5kVRMS isolation | Better speed and drive strength, but higher power and lower isolation rating | Choose ADUM120N0BRZ only when >4Mbps throughput or stronger output drive is required and 3000VRMS is not mandated |
Compared with ISO7021DR and ADUM120N0BRZ, ISO7021FDR uniquely balances ultra-low power (<5μA/ch), certified 3000VRMS isolation, and fail-safe low-default output - making it optimal for energy-constrained, safety-certified industrial sensing where reliability trumps raw speed.
Availability
ISO7021FDR is available at Aetrix Electronics and suitable for 4–20mA loop-powered transmitters, factory automation I/O modules, and low-power wireless sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for ISO7021FDR 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 ISO7021FDR belongs to TI's ultra-low-power digital isolator product line, designed specifically for energy-constrained, safety-critical industrial sensing and control applications demanding long-term reliability and regulatory compliance.
FAQ
What is the default output state of ISO7021FDR during input power loss?
The ISO7021FDR features a low-default output configuration (denoted by the "F" suffix). When input-side power (VCC1) or signal is lost, both output channels (OUTA and OUTB) transition to and hold a logic-low state after a delay of 400–750μs. This fail-safe behavior ensures predictable shutdown of downstream circuitry in safety-critical applications such as 4–20mA transmitters and intrinsic safety barriers - a key differentiator from the high-default ISO7021DR variant.
Does ISO7021FDR support asymmetric supply voltages across its isolation barrier?
Yes, ISO7021FDR fully supports independent supply rails: VCC1 can operate from 1.71V–1.89V or 2.25V–5.5V, and VCC2 may be set to a different voltage within the same ranges. This enables direct interfacing between 1.8V microcontrollers and 3.3V or 5V peripherals without external level shifters. The device maintains full 4Mbps data rate and specified CMTI performance across all valid supply combinations, as verified in TI's SLLSFA0C datasheet Section 6.3.
What certifications does ISO7021FDR hold for intrinsic safety applications?
ISO7021FDR is certified for intrinsic safety under IECEx (IEC 60079-0 & IEC 60079-11) and ATEX (EN IEC 60079-0 & EN 60079-11), with marking II 1G Ex ia IIC Ga. It also meets DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, IEC 62368-1, IEC 61010-1, and GB 4943.1. These certifications validate its use in Zone 0/20 explosive atmospheres when implemented per certified system designs - confirmed in Section 6.7 of the official datasheet.
How does ISO7021FDR achieve ultra-low power consumption without sacrificing isolation integrity?
ISO7021FDR uses edge-based encoding with ON-OFF keying (OOK) modulation across a double-capacitive SiO₂ barrier, transmitting only signal transitions rather than continuous DC states. This architecture reduces dynamic current to 120μA/channel at 1Mbps (3.3V) and quiescent current to 4.8μA/channel, while maintaining 3000VRMS isolation via robust dielectric construction and >100-year lifetime projection. The method is detailed in Section 8.1 and Figure 8-1 of the TI datasheet.
Can ISO7021FDR replace ISO7021DR on the same PCB layout?
Yes, ISO7021FDR is pin-compatible with ISO7021DR - both use identical 8-SOIC (D) packaging and identical pinout (VCC1, OUTA, INB, GND1, GND2, OUTB, INA, VCC2). No PCB redesign is required for substitution. However, the functional difference - low-default (F) vs. high-default (non-F) output behavior - must be verified against system-level fail-safe requirements before replacement, as this affects safety logic sequencing.
ISO7021FDR 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:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 4Mbps
- Propagation Delay tpLH / tpHL (Max):
- 165ns, 165ns
- Pulse Width Distortion (Max):
- 10ns
- Rise / Fall Time (Typ):
- 5ns, 5ns
- Voltage - Supply:
- 1.71V ~ 1.89V, 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO7021FDR FAQ
1.How can I place an order for ISO7021FDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7021FDR 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 ISO7021FDR reliable?
The price and inventory of ISO7021FDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7021FDR is usually 5 days.
3.What payment methods are accepted for ISO7021FDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7021FDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7021FDR?
ISO7021FDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7021FDR 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 ISO7021FDR?
For technical support, including ISO7021FDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7021FDR requirements.
6.How does Aetrix verify that ISO7021FDR is sourced from the original manufacturer or authorized distributors?
All ISO7021FDR 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 ISO7021FDR meets industry standards.
7.What is the process for return or replacement of ISO7021FDR?
All ISO7021FDR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7021FDR, 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 ISO7021FDR part is unused and in its original packaging.
Return procedure for ISO7021FDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7021FDR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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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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