ISO7761DBQ - 6-Channel 5/1 Digital Isolator, 3kVrms | Texas Instruments
MPN： ISO7761DBQ ✓ 啟用中ISO7761DBQ 概覽
A digital isolator is a semiconductor device that transfers data across an galvanically isolated barrier using high-voltage capacitive or magnetic coupling instead of an optocoupler LED. Within the broader taxonomy a digital isolator falls under isolators -> interface ICs -> integrated circuits, and it replaces legacy optocouplers in applications that demand higher speed, lower power, better CMTI, and tighter channel-to-channel timing skew. The ISO7761 specifically targets the reinforced insulation class per UL 1577 and is certified by VDE, CSA, TUV and CQC.
Key features include 100 Mbps signaling on all six channels simultaneously, 85 kV/us minimum CMTI, low propagation delay of typically 11 ns, low pulse-width distortion of 0.5 ns, and 2.5 mA per-channel quiescent current at 1 Mbps. The robust EMC performance includes system-level IEC 61000-4-2 (ESD) ratings above 8 kV contact and 15 kV air, along with IEC 61000-4-4 (EFT) compliance. All inputs and outputs support 2.25 V to 5.5 V supplies, allowing voltage level translation across the isolation barrier.
The ISO7761 is fabricated on TI's proprietary silicon-dioxide (SiO2) capacitive isolation technology, which delivers industry-leading CMTI performance and radiation tolerance. Internal refresh circuitry continuously resynchronizes the output state to the input, eliminating bit errors from CMTI events. The device integrates dc-dc converter interface pins (VCC pins are independent on each side), and all logic I/O pins use Schmitt-trigger inputs for noise immunity.
Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), motor drive gate-driver signal isolation, solar inverter high-voltage interface isolation, PLC analog/digital I/O module isolation, and medical equipment patient-isolation interfaces. The 5/1 channel count matches the typical MCU SPI or UART port arrangement. When designing with the ISO7761, place 0.1 uF and 1 uF decoupling capacitors close to each VCC pin and ensure that the high-voltage barrier trace clearance meets end-equipment isolation standards.
直接替換替代品，適用於 ISO7761DBQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ISO7761DBQ （相同外形與佔位） — 差異在於 Package, MSL Level, Channel Configuration, Number of Channels, Common-Mode Transient Immunity (CMTI).
ISO7761DBQR
✅ 直接替換聯絡詢價
查看資料表 →ISO7761FDBQ
✅ 直接替換聯絡詢價
查看資料表 →ISO7761FDBQR
✅ 直接替換📋 參考替代品（不在目錄中）
ISO7742DBQR
✅ 直接替換聯絡詢價
查看資料表 →ISO7741DBQR
✅ 直接替換聯絡詢價
查看資料表 →ISO7761DBQ 規格
| Isolation Type | Digital Isolator (capacitive SiO2) |
| Number of Channels | 6 |
| Channel Configuration | 5 Forward / 1 Reverse |
| Isolation Rating (UL 1577) | 3000 Vrms (DBQ package) |
| Data Rate (max) | 100 Mbps |
| Common-Mode Transient Immunity (CMTI) | 85 kV/us (min) |
| Propagation Delay (typ) | 11 ns |
| Pulse-Width Distortion (max) | 0.5 ns |
| Supply Voltage (each side) | 2.25 V to 5.5 V |
| Quiescent Current per Channel (1 Mbps) | 2.5 mA (typ) |
| 工作溫度 | -40 C to +125 C |
| 封裝 | 16-SSOP (DBQ), 0.154 inch / 3.90 mm body width |
| 安裝類型 | Surface Mount |
| Safety Approvals | UL 1577, VDE, CSA, TUV, CQC |
| EMC Coverage | IEC 61000-4-2 ESD, IEC 61000-4-4 EFT |
| MSL 等級 | 2 |
ISO7761DBQ 腳位配置
| 腳位 1 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| 腳位 2 | IN1 — Logic input, channel 1 |
| 腳位 3 | IN2 — Logic input, channel 2 |
| 腳位 4 | IN3 — Logic input, channel 3 |
| 腳位 5 | IN4 — Logic input, channel 4 |
| 腳位 6 | IN5 — Logic input, channel 5 |
| 腳位 7 | GND1 — Ground, side 1 |
| 腳位 8 | OUT1 — Logic output, channel 1 |
| 腳位 9 | OUT2 — Logic output, channel 2 |
| 腳位 10 | OUT3 — Logic output, channel 3 |
| 腳位 11 | OUT4 — Logic output, channel 4 |
| 腳位 12 | OUT5 — Logic output, channel 5 |
| 腳位 13 | GND2 — Ground, side 2 |
| 腳位 14 | OUT6 — Logic output, reverse channel 6 (side 2 -> side 1) |
| 腳位 15 | IN6 — Logic input, reverse channel 6 (side 2) |
| 腳位 16 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
典型應用
ISO7761DBQ 適用於 6 應用s: Industrial Fieldbus Isolation, Motor Drive Gate Driver Signal Isolation, Solar Inverter High-Voltage Interface, PLC Analog and Digital I/O Module Isolation, Medical Equipment Patient Isolation, Battery Management System (BMS) Isolation.
Industrial Fieldbus Isolation
The ISO7761DBQ provides reinforced 3000 Vrms isolation for industrial fieldbus nodes including RS-485 transceivers, CAN-FD buses, and SPI peripherals across an 800 V or 1000 V dc bus. With 100 Mbps per-channel data rate and 85 kV/us CMTI, the device tolerates fast switching transients from inverters and motor drives on the same board, eliminating bit errors on the bus. Five forward channels map directly to UART TX/RTS/CTS plus two GPIO, while the reverse channel carries UART RX, replacing two slower optocouplers with one SSOP-16 IC.
推薦
Motor Drive Gate Driver Signal Isolation
The ISO7761DBQ delivers reinforced isolation between a low-voltage MCU and a 600 V / 1200 V IGBT or SiC gate driver stage. The 85 kV/us minimum CMTI prevents false gate pulses during fast Vds transitions on the power switch, a critical requirement for motor inverters operating at 20-100 kHz PWM. With 11 ns typical propagation delay and 0.5 ns pulse-width distortion, the device preserves the dead-time accuracy of the original MCU PWM signals. Five forward channels carry the three PWM phases plus fault feedback, while the reverse channel returns the overcurrent flag.
推薦
Solar Inverter High-Voltage Interface
The ISO7761DBQ isolates the control board from the high-voltage dc-link of a solar inverter, where common-mode dv/dt can exceed 50 kV/us during IGBT turn-off. The 100 Mbps data rate supports high-resolution PWM and fast MPPT updates, while the 3000 Vrms isolation rating satisfies IEC 62109 safety requirements for PV systems up to 1000 V dc. Five forward channels isolate the PWM and enable signals, and the reverse channel isolates the fault feedback line, all within one 16-SSOP package that fits underneath the gate-driver heatsink area.
推薦
PLC Analog and Digital I/O Module Isolation
The ISO7761DBQ provides the channel count needed for a typical 4-output plus 1-input digital I/O card, leaving one channel unused or for redundancy. The 2.25-5.5 V supply range on each side matches the 3.3 V logic of PLC backplanes and the 5 V logic of field-side drivers, eliminating external level shifters. The 85 kV/us CMTI rejects the switching noise of nearby relay coils and TRIAC loads, while the 3000 Vrms isolation meets IEC 61131-2 reinforced insulation requirements for industrial control.
推薦
Medical Equipment Patient Isolation
The ISO7761DBQ delivers reinforced 3000 Vrms isolation required for patient-connected medical devices such as patient monitors, infusion pumps, and ECG systems per IEC 60601-1. With 100 Mbps data rate, the device handles high-resolution ADC data streams and LCD video sidebands across the isolation barrier without adding audible or visual artifacts. The low 2.5 mA per-channel quiescent current extends battery life on portable devices, while the SSOP-16 footprint allows compact, handheld form factors.
推薦
Battery Management System (BMS) Isolation
The ISO7761DBQ isolates the slave-side battery monitor ICs (such as the BQ79616 family) from the master MCU in a 400 V or 800 V traction battery pack. Five forward channels carry daisy-chain communication and enable signals, while the reverse channel handles the FAULT return line. The 85 kV/us CMTI prevents spurious wake-ups during precharge relay switching, and the -40 C to +125 C temperature grade supports under-the-hood automotive environments. Reinforced 3000 Vrms isolation meets the IEC 61851 and UN R100 requirements for electric vehicle battery systems.
推薦
推薦產品摘要
工程參考資料，適用於 ISO7761DBQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ISO7761DBQR | ISO7761FDBQ | ISO7761FDBQR | ISO7742DBQR | ISO7741DBQR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) |
| Number of Channels | 6 | 6 | 6 | 6 | 4 | 4 |
| Channel Direction | 5 Forward / 1 Reverse | 5/1 | 5/1 | 5/1 | 3/1 | 3/1 |
| Max Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| CMTI (min) | 85 kV/us | 85 kV/us | 85 kV/us | 85 kV/us | 25 kV/us | 25 kV/us |
| Isolation Rating (UL 1577) | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms |
| AEC-Q100 Qualified | No | No | Yes | Yes | No | No |
主要差異化特點
- Industry-leading 85 kV/us CMTI vs 25 kV/us on ISO774x (對比ISO7741DBQR)
- 6 channels in 5/1 configuration vs 4 channels in 3/1 (對比ISO7742DBQR)
- Reinforced 3000 Vrms UL 1577 rating in narrow-body SSOP (對比ISO7761DW)
設計說明
Place a 0.1 uF low-ESR ceramic bypass capacitor within 2 mm of each VCC pin (VCC1 at pin 1, VCC2 at pin 16), plus a bulk 1 uF to 10 uF capacitor on each supply rail. The SSOP-16 (DBQ) body width is only 3.90 mm, so use a four-layer PCB with a continuous ground plane directly beneath the part to maximize isolation barrier creepage and minimize switching-node coupling. Per TI datasheet layout guidance, no PCB copper or traces should cross the isolation barrier - keep all side-1 copper on the left half and all side-2 copper on the right half of the package outline.
Drive the input pins (IN1-IN6) with CMOS source impedance below 50 ohm to keep the 11 ns propagation delay and 0.5 ns pulse-width distortion within datasheet limits. Avoid long PCB traces between the isolator and the MCU or peripheral; keep each input trace under 25 mm. If driving the inputs from a logic buffer that has series resistance, place the buffer within 50 mm of the isolator input pin. Inputs have internal Schmitt-trigger hysteresis; no external hysteresis resistors are required.
Do not connect the two grounds (GND1 at pin 7 and GND2 at pin 13) together anywhere on the PCB - the 3000 Vrms isolation depends on maintaining this barrier. Use separate ground planes for side 1 and side 2, joined only at the system-level isolation star-point. Do not place any decoupling capacitor across the isolation barrier. Never apply reverse voltage to VCC1 or VCC2; each side has independent ESD clamps that are not rated for reverse polarity. For reinforced insulation, the PCB must maintain a minimum 8 mm creepage distance across the isolation barrier per IEC 61010-13. Estimated: input capacitance contribution to propagation delay is approximately 4 ps per pF of stray capacitance; trace length 25 mm adds approximately 2-3 pF total.
合規資訊
RoHS compliant per TI product page. UL 1577, VDE, CSA, TUV, CQC safety certified per the TI ISO7761 product family page. AEC-Q100 qualified variants are ISO7761FDBQ / ISO7761FDBQR, not the standard ISO7761DBQ.
