ISO7741FQDWWRQ1 - Automotive 4-Ch Digital Isolator | TI
MPN: ISO7741FQDWWRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.62 | $56.20 |
| 100 | $4.93 | $493.00 |
| 500 | $4.32 | $2,160.00 |
| 1,000 | $3.74 | $3,740.00 |
ISO7741FQDWWRQ1 Overview
A digital isolator is a semiconductor device that transfers logic signals between two galvanically isolated voltage domains using an on-chip SiO2 capacitive or RF coupler, replacing bulky optocouplers with a smaller, faster, lower-power solution. In the broader taxonomy, the ISO7741FQDWWRQ1 belongs to the digital isolator category, which sits within interface ICs in the signal chain between mixed-signal controllers and external transceivers. Reinforced isolation means the part survives 5000 Vrms (DW) or 5700 Vrms (DWW) for 60 seconds per UL 1577, which is a stricter safety requirement than basic isolation.
Key features include ±8 kV HBM ESD on all pins per AEC-Q100, robust EMC with low emissions, glitch-free power-up/power-down sequencing, and a wide -40°C to +125°C operating range. The device operates from 2.25 V to 5.5 V on both sides, eliminating the need for external level shifters when bridging 3.3 V MCUs to 5 V transceivers. Default output is high on channels without input transition to provide a known safe state at startup.
Typical applications include isolated SPI between an ECU microcontroller and a traction inverter gate driver, isolated CAN-FD bus interfaces in 12 V/48 V mild-hybrid systems, and reinforced isolation for industrial motor drives with human-accessible I/O. The AEC-Q100 qualification supports direct deployment in body electronics, battery management, and onboard charger subsystems.
When designing with this device, place 0.1 µF decoupling capacitors on both VCC1 and VCC2 as close to the IC pins as possible, and avoid routing signal traces beneath the package to preserve creepage. The default-high outputs can be inverted to default-low for fail-safe bus bias by selecting the ISO7741F-Q1 variant with the inverted default.
Drop-in alternatives for ISO7741FQDWWRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO7741FQDWWRQ1 (same form factor and footprint) — differing in AEC-Q100 Qualification, Common-Mode Transient Immunity (CMTI), Default Output State, Isolation Rating, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7741FQDWRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741DWWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741FQDWWQ1
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ISO7741FQDWWRQ1 Specifications
| Isolation Rating | 5700 Vrms (UL 1577) |
| Number of Channels | 4 (3 forward / 1 reverse) |
| Maximum Data Rate | 100 Mbps |
| Common-Mode Transient Immunity (CMTI) | 85 kV/µs (minimum) |
| Supply Voltage Range | 2.25 V to 5.5 V (both sides) |
| Operating Temperature Range | -40°C to +125°C |
| Default Output State | High |
| ESD Rating (HBM) | ±8 kV (AEC-Q100) |
| Package Type | 16-SOIC extra-wide body (DWW), 0.551" / 14.00 mm |
| Working Voltage | 1500 Vrms reinforced (per VDE 0884-11) |
| AEC-Q100 Qualification | Yes, automotive grade |
| Channel Direction Configuration | 3 forward + 1 reverse |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ISO7741FQDWWRQ1 Pin Configuration
| Pin 1 | VCC1 — Power supply, side 1 |
| Pin 2 | GND1 — Ground, side 1 |
| Pin 3 | IN1 — Input channel 1 (forward) |
| Pin 4 | IN2 — Input channel 2 (forward) |
| Pin 5 | IN3 — Input channel 3 (forward) |
| Pin 6 | IN4 — Input channel 4 (reverse) |
| Pin 7 | OUT4 — Output channel 4 (reverse) |
| Pin 8 | OUT3 — Output channel 3 (forward) |
| Pin 9 | GND2 — Ground, side 2 |
| Pin 10 | OUT2 — Output channel 2 (forward) |
| Pin 11 | OUT1 — Output channel 1 (forward) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | VCC2 — Power supply, side 2 |
| Pin 15 | GND2 — Ground, side 2 |
| Pin 16 | VCC1 — Power supply, side 1 |
Typical Applications
ISO7741FQDWWRQ1 is suitable for 7 applications: Isolated SPI for EV Traction Inverter Gate Drivers, Isolated CAN-FD for Automotive ECUs, Industrial Motor Drive Reinforced Isolation, Isolated RS-485 Communication for Substation/Energy, Battery Management System (BMS) Cell Monitoring, Isolated I2C for Server Power and Telecom, Medical Equipment Patient Isolation.
Isolated SPI for EV Traction Inverter Gate Drivers
The ISO7741FQDWWRQ1's 3 forward / 1 reverse channel configuration matches SPI bus topology (MOSI/SCK/CS forward, MISO return), and its 100 Mbps data rate easily covers the typical 10-20 MHz MCU SPI clock used to program gate driver parameters. The 85 kV/us CMTI rejects the high dV/dt noise generated by 800 V SiC MOSFET switching, and the 5700 Vrms DWW isolation provides reinforced insulation between the low-voltage MCU domain and the high-voltage bus. Placed between the MCU and the SiC gate driver IC, the ISO7741 protects the controller from destructive common-mode transients while preserving signal integrity. Compared to optocouplers, it eliminates the LED aging failure mode and saves PCB area.
Recommended
Isolated CAN-FD for Automotive ECUs
CAN-FD arbitration rates of 1-2 Mbps and data phases of 5 Mbps sit comfortably below the ISO7741FQDWWRQ1's 100 Mbps maximum, leaving timing margin for long cable propagation. The 4 channels can carry CANH, CANL, and isolated power feedback signals, while the AEC-Q100 qualification enables direct deployment in body controllers, ADAS sensor modules, and battery management units. The 5700 Vrms isolation provides reinforced insulation between the 12 V chassis and high-voltage subsystems in 48 V mild-hybrid vehicles. Placed between the MCU's CAN module and a TCAN334 or TCAN1044 transceiver, the part prevents ground loops and protects against load-dump transients.
Recommended
Industrial Motor Drive Reinforced Isolation
Industrial servo drives and VFDs require reinforced isolation between the control board (human-accessible) and the power stage (potentially lethal DC bus). The ISO7741FQDWWRQ1's DWW package delivers the creepage and clearance needed for 1500 Vrms working voltage per VDE 0884-11, satisfying IEC 61800-5-1 safety requirements. The 4 channels carry PWM direction, fault feedback, enable/disable, and one return signal between the MCU and the gate driver or current-sense ADC. The wide 2.25 V to 5.5 V supply range on both sides simplifies interfacing with 3.3 V DSPs and 5 V gate driver ICs without extra level shifters.
Recommended
Isolated RS-485 Communication for Substation/Energy
RS-485 networks in solar inverters, battery storage, and grid-tied equipment routinely span hundreds of meters and must survive ground-potential differences. The ISO7741FQDWWRQ1 provides 5700 Vrms reinforced isolation between the local MCU and the field-side RS-485 transceiver (e.g., ISL3179E or THVD1450), breaking ground loops that would otherwise corrupt Modbus or DNP3 communications. The 100 Mbps data rate covers even 50 Mbps RS-485 over short runs and allows one isolator to carry multiple UART channels via time-division. The -40C to +125C operating range supports outdoor cabinet installations.
Recommended
Battery Management System (BMS) Cell Monitoring
Battery management ICs such as the BQ79616-Q1 sit directly on the high-voltage battery stack with individual cell-tap voltages up to several hundred volts. The ISO7741FQDWWRQ1's reinforced 5700 Vrms isolation enables a single MCU to safely communicate with stacked BQ79616 nodes via isolated SPI, daisy-chaining cell telemetry across the pack. The 3/1 channel direction matches SPI requirements, and 85 kV/us CMTI handles the switching noise from adjacent DC-DC converters in the BMS. AEC-Q100 qualification supports direct automotive deployment.
Recommended
Isolated I2C for Server Power and Telecom
Hot-swap controllers, EEPROMs, and PMBus telemetry devices inside -48 V telecom rectifiers and 12 V server power supplies require galvanic isolation on the I2C/SMBus lines. The ISO7741FQDWWRQ1's 4 channels can carry SCL, SDA, and two GPIOs for alert/control while breaking ground loops between the AC-side and DC-side controllers. Its 100 Mbps rate greatly exceeds the 400 kHz I2C and 1 MHz SMBus speeds, leaving timing margin. The wide supply range allows direct interfacing with 3.3 V logic on both sides without level translation.
Recommended
Medical Equipment Patient Isolation
Patient-connected medical devices such as infusion pumps, ECG monitors, and blood-pressure modules require reinforced isolation between the patient side (applied part) and the operator/main-equipment side. The ISO7741FQDWWRQ1's 5700 Vrms UL 1577 rating and VDE 0884-11 compliance support IEC 60601-1 isolation barrier requirements for one MOPP (means of patient protection). Its 4 channels carry UART, SPI, or GPIO signals across the barrier while protecting patients from leakage currents. The low propagation delay and high CMTI preserve signal integrity for real-time physiological monitoring waveforms.
Recommended
Recommended Products Summary
Engineering reference data for ISO7741FQDWWRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7741FQDWRQ1 | ISO7741DWWR | ISO7741FQDWWQ1 |
|---|---|---|---|---|
| Package | 16-SOIC DWW (14.00 mm) | 16-SOIC DW (different package) | 16-SOIC DWW (same) | 16-SOIC DWW (same) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Isolation Rating | 5700 Vrms | 5000 Vrms | 5700 Vrms | 5700 Vrms |
| AEC-Q100 Qualification | Yes | Yes | No | No |
| Number of Channels | 4 (3F/1R) | 4 (3F/1R) | 4 (3F/1R) | 4 (3F/1R) |
| Maximum Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| CMTI | 85 kV/µs | 85 kV/µs | 85 kV/µs | 85 kV/µs |
| Supply Voltage | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V |
Key Differentiators
- Reinforced 5700 Vrms DWW package for highest working voltage (vs ISO7741FQDWRQ1)
- AEC-Q100 automotive qualification (vs ISO7741DWWR)
- 3 forward / 1 reverse channel matches SPI topology (vs ISO7740FQDBQQ1 (4 forward))
Design Notes
Decouple both VCC1 (pin 1) and VCC2 (pin 14) with 0.1 µF low-ESR ceramic capacitors placed within 2 mm of the IC pins. Add 1 µF bulk capacitors on each supply rail if the upstream LDO or DC-DC converter is more than 25 mm away. Insufficient decoupling causes logic-level glitches and CMTI degradation on the isolated side. Both supplies must be present simultaneously for proper operation; missing one side places outputs in the default state.
Do not route signal traces under the DWW package body or its internal lead frame, as this defeats the reinforced creepage and clearance that the wide-body package provides. Keep all side-1 traces at least 8 mm from side-2 traces across the package to preserve the 8 mm minimum creepage mandated by IEC 60747-17. Also verify that the upstream MCU and the gate driver share no common ground plane across the barrier.
Place the ISO7741FQDWWRQ1 directly between the MCU side and the isolated side with short, impedance-controlled traces on the high-speed SPI lines (MOSI, SCK, MISO). Maintain 50 Ω trace impedance if traces exceed 25 mm, and add source-series termination of 33 Ω near the driver pin to reduce reflections at 100 Mbps operation. Reference: TI ISO7741-Q1 datasheet section on layout guidelines.
Compliance Information
AEC-Q100 qualified for automotive. UL 1577 recognized with 5700 Vrms isolation rating. VDE 0884-11 reinforced insulation certified per datasheet. RoHS and REACH compliant per TI product page.
