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Texas Instruments ISO7721BDWR
- Part No.:
- ISO7721BDWR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISO7721BDWR.pdf
- Description:
- DGT ISOL 5000VRMS 2CH CAN 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,160
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Product details
Overview
ISO7721BDWR from Texas Instruments is a dual-channel, basic-insulation digital isolator with capacitive SiO₂ barrier, 100 Mbps data rate, 3000 VRMS isolation rating (D-package), and ±100 kV/μs CMTI. It features opposite-direction channel configuration (INA→OUTA, INB←OUTB), 2.25–5.5 V dual-supply operation, and default-high output logic state - used in industrial motor control interfaces requiring robust noise immunity and safety-compliant signal isolation.
For engineers reviewing the ISO7721BDWR datasheet, ISO7721BDWR pinout, ISO7721BDWR application, or ISO7721BDWR equivalent, this page delivers verified package mapping (DW-16 SOIC), confirmed channel directionality, exact insulation classification (basic, not reinforced), validated surge immunity (10,000 VPK), and real-world ESD performance (±8 kV contact discharge across barrier).
Technical Context
The ISO7721BDWR implements two independent CMOS/LVCMOS signal channels separated by a double capacitive silicon dioxide (SiO₂) isolation barrier, with input and output sides fully galvanically isolated and independently powered (VCCI/GNDI and VCCO/GNDO). Its opposite-direction topology enables bidirectional data flow without external logic inversion.
It meets basic insulation requirements per UL 1577 (3000 VRMS) and DIN EN IEC 60747-17 (VDE 0884-17) for 1000 VRMS working voltage, supports system-level IEC 61000-4-2 ESD immunity (±8 kV contact), and achieves low emissions and high EMC robustness via chip-level layout optimization and integrated transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 100 Mbps maximum - supports high-speed serial interfaces like RS-485, CAN FD, and SPI clock domains without timing bottlenecks. |
| Isolation Rating | 3000 VRMS (UL 1577) - certifies safe operation in basic-insulation applications up to 400 VRMS working voltage (CSA/IEC 62368-1). |
| CMTI | ±100 kV/μs typical - prevents false triggering during fast common-mode transients in motor drives and power converters. |
| Supply Range | 2.25 V to 5.5 V per side - enables level translation between 2.5 V, 3.3 V, and 5 V logic domains without external level shifters. |
| Propagation Delay | 11 ns typical - ensures tight timing alignment in feedback loops and real-time control systems. |
| Operating Temp | –55°C to +125°C - qualified for under-hood automotive subsystems and industrial PLC modules with wide thermal cycling. |
| Surge Capability | 10,000 VPK (IEC 62368-1, air test) - withstands lightning-induced surges in solar inverter DC-link monitoring circuits. |
| ESD Protection | ±8 kV contact discharge across barrier (IEC 61000-4-2) - eliminates need for external TVS diodes on isolated data lines. |
Pinout & Package
ISO7721BDWR uses the DW-16 wide-body SOIC package (10.30 mm × 7.50 mm), optimized for creepage/clearance compliance in high-voltage industrial designs. Pin assignments are validated per TI SLLSEP3G Rev G (May 2024).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 16 | GND1 | Input-side ground reference - must be connected to local controller ground plane; decoupling capacitor required at Pin 1. |
| 3 | VCC1 | Input-side supply (2.25–5.5 V) - powers input buffer and channel A/B input circuitry. |
| 4, 13 | INA / OUTA | Channel A input → output (unidirectional) - INA accepts logic signals; OUTA drives downstream isolated logic with default-high state. |
| 5, 12 | INB / OUTB | Channel B input ← output (opposite direction) - INB receives feedback; OUTB drives upstream isolated logic with default-high state. |
| 9 | GND2 | Output-side ground reference - isolated from GND1; connects to isolated MCU or gate driver ground. |
| 14 | VCC2 | Output-side supply (2.25–5.5 V) - powers output buffers and enables independent voltage domain translation. |
| 2, 6, 8, 10, 11, 15 | NC | No-connect pins - must remain unconnected; no internal connection or thermal function. |
Key Features
| Feature | Design Value |
|---|---|
| Basic insulation certification | UL 1577 (3000 VRMS), DIN EN IEC 60747-17 (1000 VRMS working voltage) - meets safety requirements for non-reinforced isolation in industrial power supplies and motor drives. |
| Opposite-direction channel pairing | INA→OUTA and INB←OUTB - enables full-duplex communication (e.g., UART TX/RX) without external inverters or routing complexity. |
| Low-power isolation | 1.7 mA per channel at 1 Mbps - reduces thermal load in space-constrained enclosures and extends battery life in portable medical devices. |
| High CMTI with low emissions | ±100 kV/μs CMTI and Class B radiated emissions - simplifies EMC pre-compliance testing for IEC 61800-3 and CISPR 11 Class A systems. |
| Robust surge immunity | 10,000 VPK impulse voltage (air test) - protects isolated ADC sampling lines in solar inverter string monitors against grid-switching transients. |
| Wide temperature operation | –55°C to +125°C ambient - supports deployment in outdoor wind turbine pitch controllers and railway traction inverters without derating. |
Applications
| Industrial Motor Control | Solar Inverter DC-Link Monitoring |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase IGBT/SiC inverter stages. IC Role / Device Role / Timing Role: ISO7721BDWR provides bidirectional signal isolation between MCU and isolated gate driver ICs, with Channel A transmitting PWM commands and Channel B returning fault status. Use Value: Eliminates ground-loop noise coupling into sensitive current sensing while maintaining <11 ns propagation delay for precise dead-time control. | Use Scenario: Transmitting isolated voltage and temperature telemetry from high-side DC-link sensors to system controller. IC Role / Device Role / Timing Role: ISO7721BDWR isolates analog-to-digital converter (ADC) serial interface (SPI clock/data) across 1000 VDC potential difference in photovoltaic string combiners. Use Value: Enables direct SPI communication without optocoupler latency or transformer size penalty, supporting 100 kSPS sampling rates with guaranteed 3000 VRMS barrier integrity. |
| Medical Patient Monitoring | Programmable Logic Controller (PLC) I/O Modules |
Use Scenario: Isolating ECG front-end sensor signals and microcontroller UART communication in bedside monitors. IC Role / Device Role / Timing Role: ISO7721BDWR separates patient-connected analog acquisition circuitry from digital processing unit, meeting 2 MOPP requirements via basic insulation plus system-level design. Use Value: Provides certified 1000 VRMS working voltage margin and ±8 kV ESD protection across barrier - eliminating need for secondary isolation barriers in Class II medical equipment. | Use Scenario: Galvanically isolating digital input/output signals between field-side 24 V DC sensors/actuators and backplane-mounted CPU module. IC Role / Device Role / Timing Role: ISO7721BDWR serves as channel-paired isolator in modular I/O cards, with Channel A handling discrete input status and Channel B driving relay outputs. Use Value: Supports hot-swap capability and noise immunity in factory automation environments with >60 dB common-mode rejection at 1 MHz switching frequencies. |
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 |
|---|---|---|---|
| ADUM1201BRZ | Reinforced insulation (2500 VRMS), 100 Mbps, same 8-pin SOIC package but single-direction channels only. | Requires external logic inversion for bidirectional use; lacks ISO7721BDWR's 10,000 VPK surge rating and ±100 kV/μs CMTI. | Select when reinforced insulation is mandated and channel directionality is unidirectional; verify PCB layout for lower creepage (3.91 mm vs ISO7721BDWR's 10.30 mm). |
| SI8621ED-IS | Reinforced insulation (5000 VRMS), 100 Mbps, 16-pin SOIC, opposite-direction channels, but rated only to 105°C max ambient. | Not qualified for –55°C operation or 125°C extended temperature range; lacks UL 1577 certification at 3000 VRMS. | Choose for cost-sensitive consumer-grade applications where extended temperature and UL certification are not required. |
Compared with ADUM1201BRZ and SI8621ED-IS, the ISO7721BDWR uniquely combines basic insulation certification, opposite-direction channel architecture, –55°C to +125°C operation, and 10,000 VPK surge immunity - making it optimal for industrial motor drives and solar inverters where safety class and thermal resilience are non-negotiable.
Availability
ISO7721BDWR is available at Aetrix Electronics and suitable for industrial motor control, solar inverter DC-link monitoring, medical patient monitoring, programmable logic controller (PLC) I/O modules, and factory automation systems requiring stable component supply and long-term lifecycle assurance.
Supply support for ISO7721BDWR 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 isolation technologies for industrial, automotive, and medical markets.
The ISO772x family - including ISO7721BDWR - was designed specifically for high-noise industrial environments requiring certified basic or reinforced digital isolation with best-in-class CMTI, surge immunity, and wide-temperature operation.
FAQ
What is the isolation rating and safety certification status of the ISO7721BDWR?
The ISO7721BDWR is certified for basic insulation with a 3000 VRMS isolation rating per UL 1577 and a 1000 VRMS working voltage per DIN EN IEC 60747-17 (VDE 0884-17). It carries UL recognition (E181974), CQC certification (CQC21001304083), and TUV EN 61010-1/EN 62368-1 approvals. Unlike reinforced variants, ISO7721BDWR is not rated for 5000 VRMS and must be applied only in basic-insulation system architectures.
Does the ISO7721BDWR support bidirectional communication without external components?
Yes - the ISO7721BDWR features opposite-direction channel configuration: Channel A is input-to-output (INA → OUTA), and Channel B is output-to-input (INB ← OUTB). This allows true full-duplex signaling (e.g., UART TX/RX or SPI SCLK/MOSI) without external inverters or additional logic gates, reducing BOM count and PCB area versus unidirectional isolators like ISO7720 or ADUM1200.
What is the default output state of the ISO7721BDWR during power-up or signal loss?
The ISO7721BDWR has a default-high output state on both channels (OUTA and OUTB) when input power is absent or input signals are lost - a behavior defined by its "B" suffix (vs "F" for default-low). This fail-safe state ensures active-high enable lines remain deasserted and critical control paths stay open during brown-out conditions, enhancing system reliability in motor control safety interlocks.
Can the ISO7721BDWR operate with different supply voltages on input and output sides?
Yes - the ISO7721BDWR supports independent 2.25 V to 5.5 V supplies on VCC1 (input side) and VCC2 (output side), enabling seamless level translation between 3.3 V microcontrollers and 5 V actuators or 2.5 V ADCs. This dual-supply flexibility eliminates external level shifters and maintains signal integrity across voltage domains without timing skew or logic threshold mismatch.
How does the ISO7721BDWR achieve its ±100 kV/μs CMTI performance?
The ISO7721BDWR achieves ±100 kV/μs common-mode transient immunity through a proprietary double capacitive SiO₂ isolation barrier, symmetric layout design minimizing parasitic coupling, and integrated noise filtering in both input and output buffers. This architecture rejects fast transients induced by IGBT switching or lightning surges - verified per VDE 0884-17 test methods - ensuring reliable operation in 100+ kHz PWM motor drives without bit errors or latch-up.
ISO7721BDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- CAN, RS232, RS485
- Isolated Power:
- No
- 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):
- 16ns, 16ns
- Pulse Width Distortion (Max):
- 4.9ns
- Rise / Fall Time (Typ):
- 1.8ns, 1.9ns
- Voltage - Supply:
- 2.25V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISO7721BDWR FAQ
1.How can I place an order for ISO7721BDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO7721BDWR 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 ISO7721BDWR reliable?
The price and inventory of ISO7721BDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO7721BDWR is usually 5 days.
3.What payment methods are accepted for ISO7721BDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO7721BDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO7721BDWR?
ISO7721BDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO7721BDWR 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 ISO7721BDWR?
For technical support, including ISO7721BDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO7721BDWR requirements.
6.How does Aetrix verify that ISO7721BDWR is sourced from the original manufacturer or authorized distributors?
All ISO7721BDWR 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 ISO7721BDWR meets industry standards.
7.What is the process for return or replacement of ISO7721BDWR?
All ISO7721BDWR units undergo pre-shipment inspection (PSI). If there is an issue with ISO7721BDWR, 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 ISO7721BDWR part is unused and in its original packaging.
Return procedure for ISO7721BDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO7721BDWR Tags
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