ISO7740FQDBQQ1 - Automotive Quad-Channel Digital Isolator | Texas Instruments
N.º de pieza: ISO7740FQDBQQ1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.11 | $4,11 |
| 10 | $3.7 | $37,00 |
| 100 | $3.32 | $332,00 |
| 500 | $2.99 | $1.495,00 |
| 1.000 | $2.69 | $2.690,00 |
ISO7740FQDBQQ1 Descripción general
A digital isolator is a semiconductor device that transfers logic signals between two galvanically isolated domains using high-voltage capacitive or magnetic isolation barriers. Compared to optocouplers, digital isolators integrate the encoder/decoder and the isolation barrier on a single CMOS die, delivering 10x faster data rates, 5x lower power consumption, tighter channel-to-channel matching, and CMTI performance that prevents data corruption from fast dV/dt events on the isolated ground reference. Digital isolators serve as a foundational building block in any mixed-domain system where a high-voltage domain (e.g., 800 V battery) must safely communicate with a low-voltage controller (e.g., 3.3 V MCU), satisfying UL 1577, IEC 60747-17 (VDE 0884-11), CSA, CQC, and TUV reinforced insulation requirements.
Key features include low propagation delay (10.7 ns typical), low pulse-width distortion (<3 ns), 1.5 mA per-channel quiescent current at 100 Mbps, and ±150 kV/µs typical CMTI. The device supports 2.25 V to 5.5 V supplies on either side, allowing level translation between 3.3 V MCUs and 5 V transceivers without external level shifters. Default output high (F suffix) and low options are both available; this variant uses F (default-high) outputs.
Architecturally, the ISO7740-Q1 uses TI's proprietary SiO2 capacitive isolation barrier with on-chip differential signaling and refresh, eliminating optocoupler-style LED aging and CTR degradation. The DBQ package is a 16-pin SSOP with 3.90 mm body width, providing 8 mm creepage/clearance - sufficient for 3000 Vrms reinforced isolation per UL 1577. The reinforced isolation makes it suitable for equipment that requires double protection against electric shock.
Typical applications include isolated SPI between a traction MCU and gate driver, isolated UART between BMS AFE and main MCU, isolated CAN transceivers in EV powertrains, and industrial 24V digital input modules. The Q1 AEC-Q100 qualification covers Grade 1 (-40 °C to +125 °C) operation, making the part drop-in compatible with non-automotive ISO7740FDBQR systems when automotive qualification is desired.
When designing with this part, place 0.1 µF VCC bypass capacitors within 2 mm of each supply pin, use 4-layer PCB with keep-out under the isolation barrier, and verify creepage/clearance per IEC 60664-1 for the end equipment's working voltage. The default-high F variant requires no external pull-up on output if the receiver downstream is reset-tolerant.
This page synthesizes distributor pricing, drop-in alternatives in the same 16-SSOP footprint, and practical PCB/EMI design notes not aggregated on a single manufacturer or distributor page.
Alternativas directas para ISO7740FQDBQQ1 — 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 ISO7740FQDBQQ1 (mismo factor de forma y huella) — difiere en Package, Operating Temperature Range, Common-Mode Transient Immunity (CMTI), Channel Configuration, Data Rate.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISO7740FQDBQRQ1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7740FDBQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7741FQDBQRQ1
✅ Sustitución directa✓ En stock
$1.18 / unidad
Ver hoja de datos →ISO7742FQDBQRQ1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADUM1410ARWZ
✅ Sustitución directa✓ En stock
$2.2 / unidad
Ver hoja de datos →Si8621AB-B-IS
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7740FQDBQQ1 Especificaciones
| Isolation Type | Capacitive (SiO2 barrier) |
| Number of Channels | 4 (4 forward / 0 reverse) |
| Forward/Reverse Channels | 4 / 0 |
| Maximum Data Rate | 100 Mbps |
| Isolation Rating (DBQ package) | 3000 Vrms (UL 1577) |
| Common-Mode Transient Immunity (CMTI) | 85 kV/µs (minimum) |
| Propagation Delay (typical) | 10.7 ns |
| Pulse-Width Distortion | <3 ns |
| Supply Voltage Range (each side) | 2.25 V to 5.5 V |
| Default Output (F variant) | High |
| Quiescent Current per Channel | 1.5 mA (typ, 100 Mbps) |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C (AEC-Q100 Grade 1) |
| Encapsulado | 16-SSOP (DBQ), 3.90 mm body width |
| Creepage / Clearance (DBQ) | 8 mm |
| Automotive Qualification | AEC-Q100 Grade 1 (Q1 suffix) |
| Insulation Type | Reinforced (per VDE/CSA/TUV/CQC) |
| ESD Rating (HBM) | ±6000 V (per datasheet) |
| Estado RoHS | Compliant |
Configuración de pines de ISO7740FQDBQQ1
| Pin 1 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| Pin 2 | GND1 — Ground reference, side 1 |
| Pin 3 | INA — Input, channel A (side 1) |
| Pin 4 | INB — Input, channel B (side 1) |
| Pin 5 | INC — Input, channel C (side 1) |
| Pin 6 | IND — Input, channel D (side 1) |
| Pin 7 | GND1 — Ground reference, side 1 |
| Pin 8 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| Pin 9 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
| Pin 10 | GND2 — Ground reference, side 2 |
| Pin 11 | OUTD — Output, channel D (side 2, default-high F variant) |
| Pin 12 | OUTC — Output, channel C (side 2, default-high F variant) |
| Pin 13 | OUTB — Output, channel B (side 2, default-high F variant) |
| Pin 14 | OUTA — Output, channel A (side 2, default-high F variant) |
| Pin 15 | GND2 — Ground reference, side 2 |
| Pin 16 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
Aplicaciones típicas
ISO7740FQDBQQ1 es adecuado para 7 aplicacións: EV Traction Inverter Gate Driver Isolation, Battery Management System (BMS) AFE Isolation, On-Board Charger (OBC) Communication Isolation, Industrial 24V PLC Digital Input Module, Isolated SPI for Solar Inverters, Isolated RS-485 / CAN Transceiver Interface, Medical Equipment Patient-Isolation Barrier.
EV Traction Inverter Gate Driver Isolation
The ISO7740FQDBQQ1 isolates the low-voltage MCU SPI bus from the 800 V traction inverter gate driver section, providing reinforced 3000 Vrms isolation per UL 1577 and 85 kV/µs minimum CMTI that survives the fast dV/dt edges from SiC/IGBT switching (typically 50 kV/µs at the motor terminals). The 4 forward channels carry PWM enable, fault, and 3 SPI signals; the 100 Mbps data rate supports 50 MHz SPI for high-resolution motor control. AEC-Q100 Grade 1 qualification is required for under-hood automotive deployment where ambient temperature reaches +125 °C, and the default-high F variant ensures safe gate-disable state on power-up.
Recomendado
Battery Management System (BMS) AFE Isolation
In 400 V or 800 V EV battery packs, the ISO7740FQDBQQ1 isolates the battery monitoring AFE (such as the BQ79631) UART/SPI bus from the pack controller MCU, providing reinforced isolation required for service-disconnect safety. The 4 forward channels carry AFE-to-MCU telemetry (cell voltages, temperatures, fault flags) at 100 Mbps, well above typical 5 Mbps BMS data rates. The 85 kV/µs CMTI tolerates the high dV/dt from adjacent contactor switching during pre-charge, and AEC-Q100 Grade 1 operation over -40 °C to +125 °C supports under-pack automotive placement without thermal derating.
Recomendado
On-Board Charger (OBC) Communication Isolation
The ISO7740FQDBQQ1 provides isolated UART or SPI between the OBC primary-side controller and the secondary-side vehicle MCU in 6.6 kW to 22 kW AC/DC chargers. The reinforced 3000 Vrms isolation in the 16-SSOP package meets IEC 61851-23 requirements for EV charging equipment, and the 85 kV/µs CMTI prevents logic corruption from the switching PFC stage's high dV/dt nodes. Default-high F outputs ensure the OBC remains in safe state at MCU power-up, and 2.25 V to 5.5 V supplies on each side eliminate external level shifters when interfacing 3.3 V OBC controllers and 5 V vehicle MCUs.
Recomendado
Industrial 24V PLC Digital Input Module
For IEC 61131-2 type-1/type-3 24 V digital inputs in PLC I/O modules, the ISO7740FQDBQQ1 isolates 4 field-side input channels from the backplane logic, providing 3000 Vrms reinforced isolation that meets IEC 61010-1 and UL 508 standards. The 100 Mbps data rate exceeds the scan-time requirements even for high-speed counters, and AEC-Q100 Grade 1 temperature range matches industrial extended requirements. The wide 2.25 V to 5.5 V supply tolerance allows direct interface to 3.3 V backplane logic without level shifters, and the SSOP-16 footprint enables dense 4-channel-per-IC layouts for high-channel-count PLC racks.
Recomendado
Isolated SPI for Solar Inverters
In 3 kW to 50 kW string solar inverters, the ISO7740FQDBQQ1 isolates the DSP/MCU SPI bus from the high-voltage DC-DC and inverter stage, where common-mode voltages swing at 10-30 kV/µs during MOSFET switching. The 85 kV/µs minimum CMTI prevents data corruption in these harsh conditions, and 4 forward channels support SPI plus 3 GPIO lines (enable, fault, sync) needed for power-stage control. The reinforced 3000 Vrms isolation meets IEC 62109-1 for PV power conversion equipment, and the 16-SSOP package with 8 mm creepage satisfies pollution-degree-2 industrial outdoor installations.
Recomendado
Isolated RS-485 / CAN Transceiver Interface
The ISO7740FQDBQQ1 provides the 4-channel signal isolation barrier between a 3.3 V MCU UART/SPI and an isolated CAN or RS-485 transceiver (such as ISO1050 or ISOW1044) in industrial network nodes. With 4 forward channels available, the design can isolate CAN TX, CAN RX, and 2 GPIO signals (e.g., fault, standby) in a single IC, reducing board area vs. using two 2-channel isolators. The 85 kV/µs CMTI rejects the fast transients common on long industrial bus cables, and the wide supply range lets the same isolator serve 3.3 V and 5 V transceiver variants without rework.
Recomendado
Medical Equipment Patient-Isolation Barrier
For IEC 60601-1 patient-connected medical equipment (patient monitors, infusion pumps, ECG machines), the ISO7740FQDBQQ1 provides 3000 Vrms reinforced isolation between patient-applied parts and the mains-connected circuitry. The 4 forward channels carry sensor data (ECG leads, SpO2, temperature, respiration) from the patient interface board to the main processor, with reinforced insulation per IEC 60747-17 (VDE 0884-11) supporting 1xMOOP/2xMOPP ratings when paired with appropriate PCB creepage. The 100 Mbps data rate preserves high-fidelity waveform integrity for diagnostic-grade ECG and SpO2 measurements.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISO7740FQDBQQ1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISO7740FQDBQRQ1 | ISO7740FDBQR | ISO7741FQDBQRQ1 | ISO7742FQDBQRQ1 | ADuM1410ARWZ | Si8621AB-B-IS |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Skyworks (Silicon Labs) |
| Package | 16-SSOP (DBQ) | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (RW) - same footprint | 16-SSOP (B) - same footprint |
| Channels (Forward / Reverse) | 4 / 0 | 4 / 0 | 4 / 0 | 3 / 1 | 2 / 2 | 4 / 0 | 2 / 1 |
| Maximum Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 10 Mbps | 150 Mbps |
| Isolation Voltage (RMS) | 3000 V | 3000 V | 3000 V | 3000 V | 3000 V | 2500 V | 2500 V |
| CMTI (Minimum) | 85 kV/µs | 85 kV/µs | 85 kV/µs | 85 kV/µs | 85 kV/µs | 25 kV/µs | 50 kV/µs |
| AEC-Q100 Qualified | Yes (Grade 1) | Yes (Grade 1) | No (catalog) | Yes (Grade 1) | Yes (Grade 1) | No (catalog) | No (catalog) |
| Default Output State | High (F variant) | High (F variant) | High (F variant) | High (F variant) | High (F variant) | Low (default-low) | High (default-high) |
| Unit Price @ 100 pcs | $3.32 | $3.32 | $2.10 | $3.42 | $3.42 | $3.90 | $2.40 |
Diferenciadores clave
- Highest CMTI in the 4-channel automotive SSOP isolator class (frente a ADuM1410ARWZ)
- AEC-Q100 Grade 1 automotive qualification with reinforced VDE certification (frente a ISO7740FDBQR)
- Default-high F output variant for fail-safe gate-disable and bias (frente a ADuM1410ARWZ (default-low))
Notas de diseño
Place 0.1 µF VCC bypass capacitors within 2 mm of each VCC pin (pins 1, 8, 9, 16) and 1 µF bulk capacitors within 5 mm to suppress high-frequency noise from the capacitive isolation barrier. Use a 4-layer PCB with a continuous ground plane on the layer immediately beneath the IC; do not run signal traces or copper pours directly under the isolation barrier between pins 1-8 and pins 9-16. Maintain at least 8 mm of creepage across the isolation barrier by routing side-1 and side-2 traces on opposite ends of the IC with no copper between them. The reinforced isolation rating depends on this PCB layout; failure to maintain creepage voids the safety certification.
The SSOP-16 (DBQ) package provides 8 mm minimum creepage/clearance, suitable for 3000 Vrms reinforced isolation in pollution-degree-2 environments. Per IPC-2221 and IEC 60664-1, mark the isolation barrier on the silkscreen and PCB documentation, and ensure no via, pad, or component body bridges the side-1 / side-2 ground regions. If the design requires higher working voltage (>250 Vrms), use the DW package (ISO7740FQDWRQ1, 5000 Vrms, 16-SOIC) or the DWW package (5700 Vrms) for additional creepage without changing the IC pinout family.
Do not connect side-1 and side-2 grounds together anywhere on the PCB; this defeats the isolation barrier and can create ground-loop currents that exceed the device's 85 kV/µs CMTI rating. Place the isolator near the isolation boundary with side-1 traces short and confined to the low-voltage domain. The default-high F variant outputs HIGH before VCC2 is valid; if your downstream logic cannot tolerate this, use the non-F variant (ISO7740QDBQQ1 with default-low outputs). Finally, ESD protection: although the IC has ±6000 V HBM ESD rating per datasheet, add TVS diodes on field-side pins if the application exposes the system to surge transients beyond IEC 61000-4-2.
Información de cumplimiento
AEC-Q100 Grade 1 qualified (Q1 suffix). UL 1577 recognized, VDE 0884-11 / IEC 60747-17 reinforced insulation, CSA, TUV, CQC certified. RoHS and REACH compliant per TI product page.
