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Texas Instruments ISOW7821FDWE
- Part No.:
- ISOW7821FDWE
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7821FDWE.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
ISOW7821FDWE from Texas Instruments is a reinforced dual-channel digital isolator with integrated high-efficiency DC-DC converter, delivering up to 0.65 W isolated power, 100 Mbps data rate, and 5000 VRMS reinforced isolation in a 16-pin SOIC-WB package. It eliminates external isolated power supplies in industrial motor control and medical equipment where space and noise immunity are critical.
For engineers reviewing the ISOW7821FDWE datasheet, ISOW7821FDWE pinout, ISOW7821FDWE application, or ISOW7821FDWE equivalent, key selection criteria include its dual-channel directionality (INA/OUTA and INB/OUTB), SEL-configurable 3.3 V/5 V isolated output, ±100 kV/µs CMTI, and compliance with UL 1577, VDE V 0884-11, and IEC 62368-1 safety standards.
Technical Context
The ISOW7821FDWE integrates two galvanically isolated signal channels using SiO₂ insulation and a monolithic on-chip transformer for power isolation, enabling simultaneous data transfer and regulated isolated supply generation. Its architecture supports forward/reverse channel configurations via pin-selectable directionality (INx/OUTx roles) and configurable VISO output voltage (3.3 V or 5 V) via the SEL pin.
It implements soft-start, thermal shutdown, overload/short-circuit protection, and UVLO with 0.2 V hysteresis on both VCC and VISO rails. The device operates across –40°C to +125°C ambient temperature and achieves >100-year projected lifetime at 1 kVRMS working voltage per VDE 0884-11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD without external clock conditioning |
| Isolation Rating | 5000 VRMS - certified reinforced isolation per UL 1577 and VDE V 0884-11, enabling use in safety-critical medical and industrial systems |
| Output Power | 0.65 W - sufficient to power downstream isolated logic (e.g., ADCs, gate drivers) without external DC-DC converters |
| CMTI | ±100 kV/µs - ensures reliable operation in noisy motor drive and grid infrastructure environments with fast switching transients |
| Supply Range | 3 V to 5.5 V - compatible with both 3.3 V and 5 V host systems, simplifying system-level voltage domain management |
| VISO Options | 3.3 V or 5 V - selected by SEL pin state (GND2/floating = 3.3 V; VISO = 5 V), eliminating need for external LDOs |
| Propagation Delay | 13 ns typ - enables precise timing-critical applications such as real-time motor control feedback loops |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and high-temperature medical imaging subsystems |
Pinout & Package
ISOW7821FDWE uses a 16-pin wide-body SOIC (SOIC-WB, DWE) package measuring 10.30 mm × 7.50 mm with creepage/clearance >8 mm, optimized for reinforced insulation and high-voltage reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary-side supply input | Accepts 3–5.5 V; powers primary-side logic and DC-DC controller; UVLO thresholds at 2.1 V / 2.7 V |
| GND1 (Pins 2, 8) | Primary-side ground reference | Return path for VCC and side-1 I/O; must be separated from GND2 by ≥8 mm PCB clearance |
| INA, INB | Signal inputs (side-1 and side-2) | LVCMOS-compatible inputs; VIH = 0.7×VSI, VIL = 0.3×VSI; threshold hysteresis = 0.1×VSI |
| OUTA, OUTB | Signal outputs (side-1 and side-2) | Configurable as push-pull outputs; IOH = –4 mA (5 V), –2 mA (3.3 V); VOL ≤ 0.4 V |
| VISO | Isolated output supply | Regulated 3.3 V or 5 V output (SEL-dependent); delivers up to 130 mA at 5 V, 75 mA at 3.3 V |
| GND2 (Pins 9, 15) | Secondary-side ground reference | Return path for VISO and side-2 I/O; electrically isolated from GND1 by SiO₂ + polymer transformer barrier |
| SEL | VISO voltage select | Connect to GND2 or float → 3.3 V; connect to VISO → 5 V; no external resistor required |
| EN1 | Side-1 output enable | High or open → outputs enabled; low → high-impedance state; supports power sequencing and fault containment |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC converter | Eliminates external isolated power supply, reducing BOM count and PCB area in space-constrained designs |
| Reinforced isolation barrier | 5000 VRMS rating + 10 kVPK surge capability enables single-component isolation for functional safety up to SIL-3/PL e |
| Configurable VISO output | SEL pin selects 3.3 V or 5 V without external components-supports mixed-voltage isolated subsystems |
| Robust EMC performance | ±8 kV IEC 61000-4-2 contact ESD across barrier and system-level surge immunity simplify CE/FCC certification |
| Thermal and fault protection | Thermal shutdown, short-circuit/overload protection, and soft-start prevent damage during startup or fault conditions |
| Extended temperature range | –40°C to +125°C operation allows deployment in harsh environments including motor drives and grid substations |
Applications
| Industrial Motor Control | Grid Infrastructure Monitoring |
|---|---|
Use Scenario: Isolating PWM signals and current-sense feedback between MCU and IGBT gate drivers in servo inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing bidirectional signal isolation and local 5 V power for gate driver ICs. Use Value: Enables compact, high-reliability inverter designs with no external isolated DC-DC, while maintaining 100 Mbps timing integrity for <1 µs dead-time control. | Use Scenario: Isolating analog sensor outputs and digital comms in high-voltage substation RTUs and fault recorders. IC Role / Device Role / Timing Role: Reinforced isolator powering isolated ADCs and UART transceivers across 5000 VRMS barriers. Use Value: Meets IEC 61850-3 and IEEE C37.90 surge immunity requirements with integrated 3.3 V/5 V VISO and ±100 kV/µs CMTI. |
| Medical Imaging Power Supplies | Automated Test Equipment (ATE) |
Use Scenario: Providing isolated control and feedback for high-frequency resonant LLC converters in MRI/X-ray generator PSUs. IC Role / Device Role / Timing Role: Signal and power isolator delivering regulated 5 V to isolated PWM controllers and sensing circuits. Use Value: Achieves 2 MOPP patient protection per IEC 60601-1 with single-package solution, eliminating creepage-critical discrete isolation + LDO combos. | Use Scenario: Isolating digital pattern generators and DUT interfaces in high-density ATE racks with tight thermal constraints. IC Role / Device Role / Timing Role: High-speed dual-channel isolator supplying 3.3 V to isolated FPGA I/O banks and level-shifting buffers. Use Value: Reduces board layer count by integrating power and signal isolation, while supporting 100 Mbps test vector rates with <13 ns propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421AARWZ | 4-channel isolator with 500 mW isolated power; 25 Mbps max data rate; 2.5 kVRMS isolation; requires external VISO regulation | Lower bandwidth and isolation rating; suited for non-safety-critical industrial I/O modules | Select when higher channel count is needed and 25 Mbps suffices; verify external LDO sizing for VISO stability |
| SI88222ED-IS | Dual-channel isolator with 500 mW isolated power; 100 Mbps; 5 kVRMS; no integrated VISO regulation-requires external feedback | Lacks SEL-configurable VISO; needs external compensation network for output regulation | Choose when design already includes isolated feedback loop; confirm layout meets 8 mm creepage for reinforced certification |
Compared with ADUM6421AARWZ and SI88222ED-IS, the ISOW7821FDWE uniquely combines 100 Mbps speed, 5000 VRMS reinforced isolation, and SEL-selectable regulated VISO in one package-reducing design complexity and qualification effort for medical and grid applications requiring full safety certification.
Availability
ISOW7821FDWE is available at Aetrix Electronics and suitable for industrial motor control, grid infrastructure monitoring, and medical imaging power supplies requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for ISOW7821FDWE 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, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and personal electronics markets.
The ISOW7821FDWE belongs to TI's reinforced digital isolator portfolio, engineered specifically to replace optocouplers and discrete isolation + DC-DC solutions in high-noise, safety-certified systems where size, reliability, and EMC robustness are critical.
FAQ
What is the maximum load current supported by ISOW7821FDWE at 5 V VISO output?
The ISOW7821FDWE delivers up to 130 mA at 5 V VISO output under recommended operating conditions (VCC = 5 V, TA ≤ 80°C). Current derating applies above 80°C at 2 mA/°C. This output power (0.65 W) is sufficient to drive isolated gate drivers, ADCs, or microcontrollers without external regulators. The ISOW7821FDWE datasheet specifies this value in Section 7.10 under IISO(OUT) for 5-V input/5-V output configuration.
Does ISOW7821FDWE support bidirectional data flow on both channels?
Yes, the ISOW7821FDWE supports configurable bidirectional operation: INA/OUTA and INB/OUTB pins can be assigned as inputs or outputs depending on system-level signal routing. Directionality is determined by external connection-not internal configuration-enabling flexible use in SPI master/slave, UART TX/RX, or encoder interface topologies. The ISOW7821FDWE pin functions table confirms INA and OUTB as dedicated inputs/outputs, but system design defines functional direction per channel.
How does the SEL pin configure VISO voltage in ISOW7821FDWE?
The SEL pin on ISOW7821FDWE selects VISO output voltage: connecting SEL to GND2 or leaving it floating configures VISO to 3.3 V; connecting SEL to VISO configures VISO to 5 V. No external resistors or regulators are needed. This hardware-selectable feature allows a single ISOW7821FDWE part number to serve both 3.3 V and 5 V isolated subsystems, simplifying inventory and design reuse. The ISOW7821FDWE datasheet details this behavior in Section 6 (Pin Functions) and Section 7.11.
What safety certifications apply to ISOW7821FDWE?
The ISOW7821FDWE holds multiple safety certifications: UL 1577 (5000 VRMS), VDE V 0884-11:2017-01 (reinforced, 7071 VPK), CSA/IEC 62368-1 and IEC 60950-1, CQC GB4943.1-2011, and TUV EN 62368-1/EN 61010-1. These cover industrial, medical (2 MOPP), and test equipment applications. Certification documentation-including certificate numbers and test reports-is published by TI and accessible via their product folder. The ISOW7821FDWE meets all listed standards as a single-component solution.
Can ISOW7821FDWE operate with 3.3 V on VCC and deliver 5 V on VISO?
No, the ISOW7821FDWE requires VCC ≥ 4.5 V to generate 5 V on VISO. When VCC = 3.3 V, only 3.3 V VISO is achievable (SEL = GND2/floating). The DC-DC converter topology limits output voltage to ≤ VCC. Per Section 7.11 of the ISOW7821FDWE datasheet, 5 V VISO operation is specified only for VCC = 5 V ±10%; attempting 3.3 V VCC with 5 V VISO will result in undervoltage or failure to regulate. For 3.3 V input systems, use ISOW7821FDWE in 3.3 V → 3.3 V mode.
ISOW7821FDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 17.6ns, 17.6ns
- Pulse Width Distortion (Max):
- 4.7ns
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISOW7821FDWE FAQ
1.How can I place an order for ISOW7821FDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7821FDWE 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 ISOW7821FDWE reliable?
The price and inventory of ISOW7821FDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7821FDWE is usually 5 days.
3.What payment methods are accepted for ISOW7821FDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7821FDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7821FDWE?
ISOW7821FDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7821FDWE 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 ISOW7821FDWE?
For technical support, including ISOW7821FDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7821FDWE requirements.
6.How does Aetrix verify that ISOW7821FDWE is sourced from the original manufacturer or authorized distributors?
All ISOW7821FDWE 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 ISOW7821FDWE meets industry standards.
7.What is the process for return or replacement of ISOW7821FDWE?
All ISOW7821FDWE units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7821FDWE, 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 ISOW7821FDWE part is unused and in its original packaging.
Return procedure for ISOW7821FDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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