ISO7740FQDBQQ1 - Automotive Quad-Channel Digital Isolator | Texas Instruments
MPN: ISO7740FQDBQQ1 ✓ Hoạt độngISO7740FQDBQQ1 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ISO7740FQDBQQ1 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ISO7740FQDBQQ1 (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature Range, Common-Mode Transient Immunity (CMTI), Channel Configuration, Data Rate.
ISO7740FQDBQRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7740FDBQR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7741FQDBQRQ1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISO7742FQDBQRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADUM1410ARWZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →Si8621AB-B-IS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7740FQDBQQ1 Thông số kỹ thuật
| 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) |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C (AEC-Q100 Grade 1) |
| Hộp | 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) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ISO7740FQDBQQ1
| Chân 1 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| Chân 2 | GND1 — Ground reference, side 1 |
| Chân 3 | INA — Input, channel A (side 1) |
| Chân 4 | INB — Input, channel B (side 1) |
| Chân 5 | INC — Input, channel C (side 1) |
| Chân 6 | IND — Input, channel D (side 1) |
| Chân 7 | GND1 — Ground reference, side 1 |
| Chân 8 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| Chân 9 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
| Chân 10 | GND2 — Ground reference, side 2 |
| Chân 11 | OUTD — Output, channel D (side 2, default-high F variant) |
| Chân 12 | OUTC — Output, channel C (side 2, default-high F variant) |
| Chân 13 | OUTB — Output, channel B (side 2, default-high F variant) |
| Chân 14 | OUTA — Output, channel A (side 2, default-high F variant) |
| Chân 15 | GND2 — Ground reference, side 2 |
| Chân 16 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
Ứng dụng tiêu biểu
ISO7740FQDBQQ1 phù hợp cho 7 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISO7740FQDBQQ1 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Highest CMTI in the 4-channel automotive SSOP isolator class (vsADuM1410ARWZ)
- AEC-Q100 Grade 1 automotive qualification with reinforced VDE certification (vsISO7740FDBQR)
- Default-high F output variant for fail-safe gate-disable and bias (vsADuM1410ARWZ (default-low))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
