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Texas Instruments ISOW7721DFMR
- Part No.:
- ISOW7721DFMR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7721DFMR.pdf
- Description:
- LOW-EMISSIONS, DUAL-CHANNEL, 1/1
- Quantity:
- Payment:
- Shipping:
Inventory:636
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Product details
Overview
ISOW7721DFMR from Texas Instruments is a two-channel galvanically isolated digital isolator with integrated low-emission, low-noise DC-DC converter. It delivers up to 0.55W isolated power (5V→5V/110mA), supports 100Mbps data rate, and features 100kV/µs CMTI and reinforced insulation per VDE 0884-17. It enables compact isolated UART/RS-485/CAN interfaces in factory automation and motor control systems.
For engineers reviewing the ISOW7721DFMR datasheet, ISOW7721DFMR pinout, ISOW7721DFMR application, or ISOW7721DFMR equivalent, key selection factors include its integrated 5V/3.3V-selectable isolated supply, dual-channel directionality (1 forward + 1 reverse), SOIC-20 wide-body package with 8mm creepage/clearance, and CISPR 32 Class B compliance on 2-layer PCBs without shielding.
Technical Context
The ISOW7721DFMR integrates signal isolation using double capacitive SiO₂ barriers and power isolation via on-chip transformers with thin-film polymer insulation. Its 25MHz low-frequency power converter minimizes conducted noise while enabling <24mVpp output ripple and ±5% VISOOUT accuracy across load conditions.
It implements independent supply domains: VIO (1.71–5.5V) for logic-side I/O and VDD (3–5.5V) for the DC-DC primary, with soft-start, UVLO, OVLO, short-circuit, and thermal shutdown protection. The device supports multi-device chaining via CC/LF pins to scale isolated power beyond 1W and 200mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 100 Mbps - supports high-speed serial protocols including UART, RS-485, and CAN without external timing constraints. |
| Isolated power output | Up to 0.55 W - eliminates need for discrete isolated DC-DC, enabling space-constrained designs with single-supply operation. |
| VISOOUT accuracy | ±5% - ensures stable biasing of downstream isolated circuitry (e.g., transceivers, ADCs) without post-regulation. |
| CMTI | 100 kV/µs (typical) - maintains signal integrity in noisy industrial environments with fast voltage transients across isolation barrier. |
| EMI performance | CISPR 32/EN 55032 Class B compliant with >5 dB margin on 2-layer board - reduces layout complexity and eliminates ferrite beads in many cases. |
| Safety certifications | VDE 0884-17 (reinforced), UL 1577, IEC 62368-1, IEC 61010-1, IEC 60601-1, GB 4943.1 - qualified for medical, industrial, and grid infrastructure safety-critical applications. |
| Operating temperature | –40°C to +125°C - supports extended ambient operation in motor drives and outdoor grid equipment without derating. |
Pinout & Package
ISOW7721DFMR is housed in a 20-pin wide-body SOIC (DFM) package measuring 12.83 mm × 10.30 mm with 8 mm minimum creepage and clearance. The package meets reinforced insulation requirements and supports surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB | Input channels A and B | Logic-side digital inputs; support 1.71–5.5V VIO and tolerate ±8kV ESD (IEC 61000-4-2 contact discharge). |
| OUTA, OUTB | Output channels A and B | Isolated-side digital outputs; default state is high for ISOW7721 (non-F suffix); drive capability up to ±4 mA at 5V. |
| VIO, VDD | Logic and power converter supplies | Independent rails: VIO powers side-1 I/O (1.71–5.5V), VDD powers DC-DC primary (3–5.5V); may be tied together for single-supply use. |
| VISOIN, VISOOUT | Isolated supply input/output | VISOIN powers secondary-side isolator logic; VISOOUT delivers regulated isolated power (5V or 3.3V selectable via VSEL). |
| VSEL | VISOOUT voltage select | Short to GND2 → 3.3V output; short to VISOOUT → 5V output; enables flexible power architecture without external regulators. |
| EN_IO1, EN_IO2 | Channel output enables | High- or open-state enables respective output; low-state places output in high-Z and disables transmitter - supports dynamic channel gating. |
| CC, LF | Multi-device chaining control | LF = GND1 configures device as primary; CC synchronizes multiple ISOW7721 units to combine isolated power output (>1W total). |
| GND1, GND2, GNDIO, GISOIN | Ground terminals | GND1/GNDIO must be shorted; GND2/GISOIN may be shorted or connected via ferrite bead to suppress common-mode noise on isolated side. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated low-noise DC-DC converter | 25 MHz switching frequency enables low EMI and <24 mVpp output ripple - avoids interference with sensitive analog or RF circuits. |
| Reinforced isolation barrier | Dual-dielectric construction: SiO₂ capacitors for signal isolation + thin-film polymer transformers for power isolation - certified to VDE 0884-17. |
| Multi-device power chaining | CC/LF interface allows up to two ISOW7721DFMR units to synchronize and deliver >1 W / >200 mA isolated power - scales system-level isolation without redesign. |
| Robust EMC immunity | ±8 kV IEC 61000-4-2 contact ESD, system-level EFT/surge immunity - reduces need for external protection components in harsh industrial environments. |
| Flexible supply configuration | VIO (1.71–5.5V) and VDD (3–5.5V) independence enables mixed-voltage systems (e.g., 1.8V MCU logic + 5V isolated peripherals) without level shifters. |
Applications
| Industrial Motor Control | Grid Infrastructure Monitoring |
|---|---|
|
Use Scenario: Isolating gate driver control signals and feedback from high-voltage IGBT/SiC inverters in servo drives and VFDs. IC Role / Device Role / Timing Role: Dual-channel isolator provides separated forward (PWM command) and reverse (fault/status) paths with 100 Mbps bandwidth and 100 kV/µs CMTI. Use Value: Enables compact, single-chip isolation of both control and sensing lines while delivering 5V/110mA isolated power for gate drivers - eliminates separate isolated bias supplies. |
Use Scenario: Signal and power isolation in smart meter communication modules interfacing with PLC or RF mesh networks. IC Role / Device Role / Timing Role: Provides reinforced insulation between microcontroller UART and isolated RS-485 transceiver, with integrated 3.3V/140mA supply for transceiver biasing. Use Value: Meets IEC 62368-1 and IEC 61010-1 safety standards while reducing BOM count by integrating isolated power - critical for certified metering hardware. |
| Factory Automation I/O Modules | Medical Diagnostic Equipment |
|
Use Scenario: Isolating digital I/O between PLC backplane and field sensors/actuators in modular I/O systems. IC Role / Device Role / Timing Role: Two independent isolation channels handle bidirectional digital status/control exchange; VSEL selects 5V or 3.3V VISOOUT to match downstream logic. Use Value: Supports hot-swap-capable modules with multi-device chaining - two ISOW7721DFMR units deliver >1W isolated power for entire module's isolated side. |
Use Scenario: Isolating patient-connected sensor front-ends (ECG, EEG) from main processing unit in diagnostic imaging and monitoring devices. IC Role / Device Role / Timing Role: Reinforced insulation per IEC 60601-1 and GB 4943.1 ensures patient safety; low-noise DC-DC prevents interference with µV-level analog signals. Use Value: Eliminates need for external isolated DC-DC and optocouplers - simplifies layout, improves reliability, and accelerates regulatory certification for Class II medical devices. |
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 |
|---|---|---|---|
| ADUM6421AARIZ-RL | 4-channel isolator with 500 mW isolated power; uses iCoupler® transformer isolation; no VSEL pin - fixed 3.3V VISOOUT. | Higher channel count but lower max data rate (25 Mbps); lacks CISPR 32 Class B margin on 2-layer boards. | Prefer ADUM6421AARIZ-RL when needing ≥3 isolated data channels and 3.3V-only isolated supply; avoid if 100 Mbps or 5V VISOOUT required. |
| SI88222ED-IS | 2-channel isolator with 500 mW isolated power; uses capacitive isolation; no integrated DC-DC enable/disable control (EN pin). | No soft-start or overcurrent protection; lower CMTI (75 kV/µs); not certified to IEC 60601-1. | Choose SI88222ED-IS only for cost-sensitive non-medical applications where full safety certification and robust protection are not mandatory. |
Compared with ADUM6421AARIZ-RL and SI88222ED-IS, the ISOW7721DFMR uniquely combines 100 Mbps speed, selectable 5V/3.3V isolated output, CISPR 32 Class B compliance on minimal PCB layers, and full medical-grade safety certification - making it optimal for high-integrity industrial and healthcare isolation.
Availability
ISOW7721DFMR is available at Aetrix Electronics and suitable for factory automation, motor control, and medical equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-critical designs.
Supply support for ISOW7721DFMR 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 ICs for industrial, automotive, and medical markets.
The ISOW7721DFMR belongs to TI's ISOW77xx family of integrated signal-and-power isolators, designed specifically to replace discrete isolator + isolated DC-DC combinations in space-constrained, EMI-sensitive, and safety-certified systems.
FAQ
What is the maximum isolated power output of the ISOW7721DFMR?
The ISOW7721DFMR delivers up to 0.55 W of isolated power: 5V→5V at 110 mA, 5V→3.3V at 140 mA, or 3.3V→3.3V at 60 mA. Output voltage is selected via the VSEL pin. When used in multi-device chain mode with a second ISOW7721DFMR, total isolated power exceeds 1 W and 200 mA - verified in TI's SLLSFP4A datasheet Section 3 and Table 5.9.
Does the ISOW7721DFMR support both 3.3V and 5V isolated output voltages?
Yes, the ISOW7721DFMR supports selectable VISOOUT via the VSEL pin: shorting VSEL to GND2 configures 3.3V output (±5%), while shorting VSEL to VISOOUT configures 5V output (±5%). This flexibility allows direct compatibility with 3.3V or 5V isolated-side peripherals such as RS-485 transceivers or ADC references - confirmed in Section 4 Pin Functions and Table 5.9 of the ISOW7721DFMR datasheet.
What safety certifications does the ISOW7721DFMR hold?
The ISOW7721DFMR is certified to VDE 0884-17 (DIN EN IEC 60747-17) for reinforced insulation, UL 1577, IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1. These certifications validate its suitability for medical, industrial, and grid infrastructure applications - detailed in Section 5.7 and Table 5.6 of the official TI datasheet SLLSFP4A.
Can the ISOW7721DFMR operate with different input and output logic voltages?
Yes, the ISOW7721DFMR supports independent VIO (1.71–5.5V) and VDD (3–5.5V) supplies, enabling mixed-voltage operation - for example, 1.8V MCU logic on the primary side and 5V peripherals on the isolated side. VISOIN and VISOOUT are decoupled from VIO/VDD, allowing full voltage domain separation - specified in Section 3 Description and Table 5.3 of the ISOW7721DFMR datasheet.
How does the ISOW7721DFMR achieve CISPR 32 Class B compliance on a 2-layer PCB?
The ISOW7721DFMR achieves >5 dB margin for CISPR 32 Class B emissions on 2-layer boards through its 25 MHz low-frequency DC-DC converter, optimized internal layout, and integrated EMI suppression features - including provisions for optional ferrite beads on VISOIN/VISOOUT. No external shielding or 4-layer stackup is required - validated in Section 1 Features and Application Report SLLA322.
ISOW7721DFMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- CAN, RS232, RS485, SPI
- 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):
- 85kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 15.7ns, 15.7ns
- Pulse Width Distortion (Max):
- 5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.4ns
- Voltage - Supply:
- 2.97V ~ 3.63V, 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISOW7721DFMR FAQ
1.How can I place an order for ISOW7721DFMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7721DFMR 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 ISOW7721DFMR reliable?
The price and inventory of ISOW7721DFMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7721DFMR is usually 5 days.
3.What payment methods are accepted for ISOW7721DFMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7721DFMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7721DFMR?
ISOW7721DFMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7721DFMR 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 ISOW7721DFMR?
For technical support, including ISOW7721DFMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7721DFMR requirements.
6.How does Aetrix verify that ISOW7721DFMR is sourced from the original manufacturer or authorized distributors?
All ISOW7721DFMR 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 ISOW7721DFMR meets industry standards.
7.What is the process for return or replacement of ISOW7721DFMR?
All ISOW7721DFMR units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7721DFMR, 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 ISOW7721DFMR part is unused and in its original packaging.
Return procedure for ISOW7721DFMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7721DFMR Tags
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