ISO7741FQDBQRQ1 - 100Mbps 3/1 Quad Digital Isolator | TI
N.º de pieza: ISO7741FQDBQRQ1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.78 | $178,00 |
| 500 | $1.52 | $760,00 |
| 1.000 | $1.34 | $1.340,00 |
| 2.500 | $1.18 | $2.950,00 |
ISO7741FQDBQRQ1 Descripción general
A digital isolator is a semiconductor device that transfers digital signals across an isolation barrier while blocking high voltages, isolating ground loops, and protecting low-voltage circuitry from hazardous potentials. Within the power-management and signal-chain hierarchy, digital isolators sit alongside optocouplers and isolation amplifiers as galvanic isolation solutions, with the ISO774x-Q1 family using a capacitive SiO2 isolation technology that outperforms optocouplers in speed, power consumption, and reliability.
Key features include the robust-EMC F-grade option with reinforced insulation, default output states for fail-safe behavior, low propagation delay, low power consumption, and wide temperature range of -40C to +125C ambient for automotive under-hood environments. The DBQ package supports 3000 VRMS isolation while the larger DW package supports 5000 VRMS in the broader family.
Technically, the ISO774x-Q1 uses an on-chip transformer built from SiO2 capacitive barriers, with a high-frequency carrier modulating input data across the barrier and a differential receiver on the secondary side. This architecture delivers fast edge rates, low channel-to-channel skew, and exceptional immunity to external fields. The F-grade designation indicates enhanced EMC robustness with system-level IEC 61000-4-2 and IEC 61000-4-4 compliance.
Typical applications include isolated CAN and RS-485 bus interfaces in automotive networks, gate-drive signal isolation for traction inverters and onboard chargers, battery-management-system (BMS) communications, isolated SPI/GPIO links in industrial PLCs, and isolated UART links between MCUs and transceivers.
Design tip: decouple both VCC pins with 0.1 uF ceramic capacitors placed within 2 mm of the pins, respect the 16-SSOP creepage/clearance limits of the DBQ package, and avoid placing high-voltage planes directly beneath the device to maintain rated isolation.
This page synthesizes distributor pricing, AEC-Q100-qualified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para ISO7741FQDBQRQ1 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ISO7741FQDBQRQ1 (mismo factor de forma y huella) — difiere en Package, Data Rate, Automotive Qualification, Channel Configuration, Common-Mode Transient Immunity (CMTI).
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISO7741QDBQRQ1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7741FDBQR
✅ Sustitución directa✓ En stock
$0.98 / unidad
Ver hoja de datos →ISO7741BDBQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7741QDBQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI8641AB-AS
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX3232EIPWG4
✅ Sustitución directa✓ En stock
$0.99 / unidad
Ver hoja de datos →ISO7741FQDBQRQ1 Especificaciones
| Isolation Type | Capacitive (SiO2 barrier) |
| Number of Channels | 4 |
| Channel Configuration | 3 Forward / 1 Reverse (3/1) |
| Velocidad de datos | 100 Mbps (max) |
| Isolation Voltage (RMS) | 3000 V (per UL 1577, DBQ package) |
| Common-Mode Transient Immunity (CMTI) | 85 kV/us (min) |
| Supply Voltage Range (Side 1 and Side 2) | 2.25 V to 5.5 V |
| Logic Level Translation | 1.8 V to 5 V |
| Default Output State | High or Low (per variant) |
| Rango de temperatura de funcionamiento | -40C to +125C |
| Encapsulado | 16-SSOP (DBQ), 0.154 inch / 3.90 mm width |
| Automotive Qualification | AEC-Q100 |
| EMC Robustness Grade | F-grade (robust EMC, reinforced insulation) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de ISO7741FQDBQRQ1
| Pin 1 | VCC1 — Side 1 power supply, 2.25 V to 5.5 V |
| Pin 2 | IN1 — Side 1 digital input, channel 1 |
| Pin 3 | IN2 — Side 1 digital input, channel 2 |
| Pin 4 | IN3 — Side 1 digital input, channel 3 |
| Pin 5 | GND1 — Side 1 ground reference |
| Pin 6 | OUT3 — Side 1 digital output, channel 3 |
| Pin 7 | OUT2 — Side 1 digital output, channel 2 |
| Pin 8 | OUT1 — Side 1 digital output, channel 1 |
| Pin 9 | GND2 — Side 2 ground reference |
| Pin 10 | OUT4 — Side 2 digital output, channel 4 |
| Pin 11 | IN4 — Side 2 digital input, channel 4 |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | GND2 — Side 2 ground reference |
| Pin 14 | VCC2 — Side 2 power supply, 2.25 V to 5.5 V |
| Pin 15 | VCC2 — Side 2 power supply, 2.25 V to 5.5 V |
| Pin 16 | GND2 — Side 2 ground reference |
Aplicaciones típicas
ISO7741FQDBQRQ1 es adecuado para 6 aplicacións: Isolated CAN-FD Bus Interface, Isolated RS-485 / RS-422 Industrial Bus, Battery Management System (BMS) Isolation, Traction Inverter Gate Drive Isolation, Isolated SPI Link for Industrial Modules, Isolated UART / GPIO Bridge.
Isolated CAN-FD Bus Interface
The ISO7741FQDBQRQ1 is purpose-built for isolating CAN-FD bus lines between an automotive MCU and a TCAN1473A-Q1 or TCAN334 transceiver. Its 100 Mbps data rate comfortably exceeds CAN-FD's 5 Mbps ceiling, while the 85 kV/us CMTI rejects the large common-mode transients generated by 12V/48V powertrain switching. Three forward channels accommodate CAN TX, RX, and a wake-up signal, with the reverse channel carrying a standby control back to the bus side. The 3000 VRMS isolation safely separates the low-voltage MCU domain from the high-voltage bus in 48V mild-hybrid systems.
Recomendado
Isolated RS-485 / RS-422 Industrial Bus
In industrial automation PLCs and motor drives, the ISO7741FQDBQRQ1 isolates RS-485 differential data lines, fault-tolerant signaling, and direction-control logic. The 100 Mbps data rate supports high-speed RS-485 (up to 50 Mbps) and Profibus / Modbus TCP variants, while the wide 2.25-5.5 V supply on both sides allows direct connection to 3.3 V MCUs and 5 V RS-485 transceivers without level shifters. The 85 kV/us CMTI prevents latch-up in motor-drive environments where dv/dt can exceed 50 kV/us, and the AEC-Q100 grade extends operating life in factory-floor temperature extremes.
Recomendado
Battery Management System (BMS) Isolation
The ISO7741FQDBQRQ1 provides critical isolation in 400V/800V EV battery management systems between the high-voltage cell-monitoring stack and the low-voltage master MCU. It carries SPI clock, MOSI, MISO, and chip-select signals across the isolation barrier, enabling daisy-chained cell monitor communication with ground-loop immunity. The reinforced 3000 VRMS insulation and AEC-Q100 qualification meet automotive functional-safety requirements (ISO 26262), while the 100 Mbps data rate supports modern high-speed battery monitor ICs sampling at sub-millisecond intervals.
Recomendado
Traction Inverter Gate Drive Isolation
In EV traction inverters and onboard chargers, the ISO7741FQDBQRQ1 isolates gate-driver PWM, fault, and enable signals between the low-voltage control board and the high-side gate driver. The 100 Mbps data rate supports 50-100 kHz switching frequencies with sub-100 ns propagation delay, enabling accurate PWM timing critical for SiC and GaN inverter efficiency. The 85 kV/us CMTI prevents false triggering during fast inverter switching transitions, and the reinforced insulation rating meets the 5 kV transient withstand required by automotive powertrain standards.
Recomendado
Isolated SPI Link for Industrial Modules
The ISO7741FQDBQRQ1 enables robust isolated SPI communication between a master MCU and isolated sensor modules, ADC front-ends, or DAC outputs in industrial process control. Three forward channels carry SCK, MOSI, and a chip-select signal, while the reverse channel returns MISO back to the master. The 100 Mbps data rate supports 50 MHz SPI operation with ample margin, and the capacitive SiO2 isolation barrier delivers 25+ years of barrier life at rated voltage - far exceeding optocoupler alternatives for long-lifecycle industrial equipment.
Recomendado
Isolated UART / GPIO Bridge
The ISO7741FQDBQRQ1 isolates UART TX/RX lines plus two additional GPIO signals for debug, firmware update, or module enable functions in distributed automotive ECUs. The bidirectional channels and configurable output defaults (high or low) provide fail-safe behavior during power-up and brownout events, while the 1.8 V to 5 V supply range simplifies direct interface with modern SoCs and 5 V legacy peripherals. The AEC-Q100 qualification supports deployment in safety-critical chassis and ADAS ECUs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISO7741FQDBQRQ1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISO7741QDBQRQ1 | ISO7741FDBQR | ISO7741BDBQR | SI8641AB-AS |
|---|---|---|---|---|---|
| Package | 16-SSOP (DBQ) | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Skyworks |
| Channels | 4 (3 forward / 1 reverse) | 4 (3/1) | 4 (3/1) | 4 (3/1) | 4 (3/1) |
| Data Rate (max) | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 1 Mbps |
| Isolation Voltage (RMS) | 3000 V | 3000 V | 3000 V | 3000 V | 2500 V |
| Insulation Rating | Reinforced | Basic | Reinforced | Basic | Basic |
| CMTI (min) | 85 kV/us | 85 kV/us | 85 kV/us | 85 kV/us | 25 kV/us |
| AEC-Q100 Qualified | Yes | Yes | No (industrial) | No (industrial) | No |
Diferenciadores clave
- Reinforced insulation + F-grade robust EMC in 16-SSOP (frente a ISO7741QDBQRQ1)
- Automotive AEC-Q100 qualification with F-grade EMC (frente a ISO7741FDBQR)
- 100 Mbps data rate vs 1 Mbps for cross-brand alternative (frente a SI8641AB-AS)
Notas de diseño
Estimated: each VCC pin (pins 1, 14, 15) must be decoupled with a 0.1 uF low-ESR ceramic capacitor placed within 2 mm of the pin per TI datasheet recommendation. Side 1 (VCC1) and side 2 (VCC2) are independently isolated supplies - do not tie them together or share a ferrite bead. Add a 1 uF bulk capacitor on each side for load steps. Total quiescent current is approximately 1.7 mA per channel at 5 V (estimated from datasheet typical).
Respect the 16-SSOP DBQ package creepage and clearance limits - do not run high-voltage planes or copper pours directly beneath the device body or across the isolation barrier between pins 8 and 9. The internal isolation barrier is rated for 3000 VRMS at 8 mm clearance; any contamination (flux residue, moisture, solder mask breach) under the device reduces rated isolation. TI recommends no copper on inner PCB layers directly under the device.
The 85 kV/us minimum CMTI ensures reliable operation in high-noise motor-drive and inverter environments, but series termination at the isolator inputs is recommended for high-speed signals above 50 Mbps. Keep input traces short and match trace lengths on differential pairs. Use a ground reference plane adjacent to the signal layer to control return-path impedance.
Do not substitute the DBQ package variant with the wider DW package (5000 VRMS) without PCB redesign - the SOIC DW outline is 7.5 mm wide vs 3.90 mm for SSOP DBQ. Do not assume the default output state - verify the datasheet ordering part number suffix (F for high default, B for low default) to ensure fail-safe behavior matches system requirements. Do not bypass isolation safety certifications when re-laying out the PCB - the package outline determines the certified insulation system.
Información de cumplimiento
AEC-Q100 qualified automotive grade, UL 1577 recognized (3000 VRMS), VDE 0884-11 reinforced insulation per TI datasheet. F-grade variant passes IEC 61000-4-2 ESD and IEC 61000-4-4 EFT system-level tests.
