ISO7831DW - 100Mbps 3-Ch Reinforced Digital Isolator | TI
料号： ISO7831DW ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.25 | $4.25 |
| 10 | $3.82 | $38.20 |
| 100 | $3.4 | $340.00 |
| 500 | $3.06 | $1,530.00 |
| 1,000 | $2.72 | $2,720.00 |
ISO7831DW 概述
A digital isolator is an integrated circuit that transmits digital signals across a galvanic isolation barrier, blocking high voltages, ground loops, and common-mode transients from reaching sensitive low-voltage circuitry. Within the interface IC hierarchy, digital isolators sit between logic-level translators and fully isolated transceivers; reinforced-class devices such as the ISO7831 represent the highest isolation category under IEC 60747-17.
Key features include a common-mode transient immunity (CMTI) of 70 kV/us for reliable operation in noisy switching environments, dual 2.25 V to 5.5 V supplies compatible with low-voltage logic, and an enable pin for output tri-state control. Certifications include UL 1577, IEC 60747-17 (VDE), and CSA, supporting safety-critical end equipment.
Technically, the ISO7831 uses TI's proprietary capacitive isolation technology, which outperforms optocouplers with lower power, higher speed, and longer lifetime. Propagation delay is approximately 11 ns with about 1 ns pulse-width distortion, preserving signal timing integrity across the barrier. Operating temperature spans -40C to +125C for harsh industrial conditions.
Typical applications include motor-drive gate-control interfaces, isolated SPI/UART communication in industrial fieldbus systems, and power inverter control where reinforced isolation is mandated. High CMTI and low EMI also suit medical equipment requiring patient-safety isolation.
Design tip: place 0.1 uF decoupling capacitors close to both VCC1 and VCC2 pins, and use the enable pin to force a defined output state during power sequencing.
直接替换替代料： ISO7831DW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISO7831DW （相同外形与封装尺寸） ——差异在于 Isolation Technology, Propagation Delay.
快速对比工具——选择替代料号进行并排对比：
ISO7830DW
✅ 直接替换✓ 有现货
$3.5 / 个
查看数据手册 →ISO7832DW
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ISO7842DW
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ISO7731DW
✅ 直接替换📋 参考替代料（不在目录中）
ISO6731DW
✅ 直接替换📋 参考替代料（不在目录中）
ISO7831DW 规格参数
| 通道数 | 3 (2 forward / 1 reverse) |
| Signaling Rate | Up to 100 Mbps |
| Isolation Rating | 5700 VRMS (DigiKey listing) |
| Peak Isolation Voltage | 8000 VPK |
| VIOWM Working Voltage | 2000 Vrms |
| Creepage | 14.5 mm |
| CMTI | 70 kV/us |
| Supply Voltage Range (VCC1/VCC2) | 2.25 V to 5.5 V |
| Propagation Delay | 11 ns (typical) |
| Pulse-Width Distortion | 1 ns (typical) |
| Isolation Technology | Capacitive (TI) |
| 工作温度 | -40C to +125C |
| 封装 | 16-SOIC (DW, 0.295 in / 7.50 mm width) |
| 安装类型 | Surface Mount |
| Certifications | UL 1577, IEC 60747-17 (VDE), CSA |
| 使能引脚 | Yes (output tri-state control) |
ISO7831DW 引脚配置
| 引脚 1 | VCC1 — Side-1 supply, 2.25 V to 5.5 V |
| 引脚 2 | GND1 — Side-1 ground |
| 引脚 3 | A1 — Side-1 input, channel 1 (forward) |
| 引脚 4 | A2 — Side-1 input, channel 2 (forward) |
| 引脚 5 | NC — No connect (see datasheet) |
| 引脚 6 | B1 — Side-1 output, reverse channel |
| 引脚 7 | EN1 — Side-1 output enable (tri-state control) |
| 引脚 8 | NC — No connect (see datasheet) |
| 引脚 9 | NC — No connect (see datasheet) |
| 引脚 10 | EN2 — Side-2 output enable (tri-state control) |
| 引脚 11 | C1 — Side-2 input, reverse channel |
| 引脚 12 | NC — No connect (see datasheet) |
| 引脚 13 | B2 — Side-2 output, channel 2 (forward) |
| 引脚 14 | B3 — Side-2 output, channel 1 (forward) |
| 引脚 15 | GND2 — Side-2 ground |
| 引脚 16 | VCC2 — Side-2 supply, 2.25 V to 5.5 V |
典型应用
ISO7831DW 适用于 6 应用s: Motor Drive Gate Control, Isolated SPI/UART Industrial Communication, Solar and Industrial Power Inverters, Medical Equipment Patient Isolation, Battery Management Systems, PLC and Factory Automation I/O.
Motor Drive Gate Control
The ISO7831's 70 kV/us CMTI withstands the extreme dv/dt transients generated by IGBT and SiC MOSFET switching in three-phase inverters, preventing false output toggling that lower-CMTI isolators suffer. Its 100 Mbps rate and 11 ns propagation delay with 1 ns distortion preserve PWM timing accuracy for high-frequency motor control loops. Placed between the MCU/gate-driver domains, it provides reinforced 2000 Vrms isolation with 14.5 mm creepage, meeting safety requirements between control electronics and the high-voltage DC bus.
推荐
Isolated SPI/UART Industrial Communication
With signaling up to 100 Mbps, the ISO7831 handles high-speed SPI links to isolated ADCs and sensors, while remaining backward-compatible with UART and GPIO rates. The independent 2.25 V to 5.5 V supplies on each side enable direct level translation between 3.3 V controllers and 5 V field-side logic. The 2/1 channel configuration supports SPI clock/data forward with MISO return, and 11 ns delay keeps total round-trip latency negligible for closed-loop industrial fieldbus nodes.
推荐
Solar and Industrial Power Inverters
In grid-tied solar inverters, the ISO7831 provides the reinforced isolation barrier between the low-voltage DSP controller and the power-stage gate signals, backed by UL 1577, IEC 60747-17 (VDE), and CSA certifications required by end-equipment safety standards. The 8000 VPK surge rating withstands grid transients, while 2000 Vrms VIOWM covers continuous working voltage across the 400 V or 800 V DC bus. Low EMI from capacitive isolation simplifies EMC compliance in these dense power systems.
推荐
Medical Equipment Patient Isolation
The ISO7831's reinforced isolation class, 14.5 mm creepage, and 8000 VPK rating support patient-safety isolation between measurement front ends and processing electronics in diagnostic and monitoring equipment. Its capacitive isolator technology produces lower radiated EMI than optocoupler solutions, easing medical EMC design. The 100 Mbps capability carries high-sample-rate digitized physiological data across the barrier, while -40C to +125C operation supports autoclavable and thermally stressed enclosures.
推荐
Battery Management Systems
In high-voltage battery packs for industrial and automotive systems, the ISO7831 isolates the pack-side BMS communication (SPI or GPIO status lines) from the vehicle or controller chassis ground. The 2000 Vrms VIOWM and 14.5 mm creepage cover 400 V and 800 V pack working voltages, and 70 kV/us CMTI tolerates contactor-switching transients. Dual-supply operation from 2.25 V lets the pack side run at low battery-domain voltages while the host side uses standard 3.3 V or 5 V logic.
推荐
PLC and Factory Automation I/O
Programmable logic controller I/O modules require galvanic isolation between the field wiring and the backplane; the ISO7831's three channels (2/1) cover typical digital input/output signal groups with one reverse-channel status line. Certification to UL 1577 and IEC 60747-17 simplifies module-level safety approval, while 100 Mbps headroom supports high-speed counter and encoder interfaces. Its wide -40C to +125C temperature range meets harsh cabinet environments common in factory automation.
推荐
推荐产品汇总
工程参考数据： ISO7831DW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ISO7830DW | ISO7832DW | ISO7842DW | ISO7731DW |
|---|---|---|---|---|---|
| Package | SOIC-16 (DW, wide body) | SOIC-16 (DW) - same | SOIC-16 (DW) - same | SOIC-16 (DW) - same | SOIC-16 (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channel Configuration | 3-ch, 2/1 | 3-ch, 3/0 | 3-ch, 1/2 | 4-ch, 2/2 | 3-ch, 2/1 |
| Signaling Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| Reinforced Isolation | Yes (2000 Vrms VIOWM) | Yes (2000 Vrms VIOWM) | Yes (2000 Vrms VIOWM) | Yes (1500 Vrms VIOWM) | No (basic) |
| Creepage | 14.5 mm | 14.5 mm | 14.5 mm | 14.5 mm | 8 mm (narrow DW) |
| CMTI | 70 kV/us | 70 kV/us | 70 kV/us | 100 kV/us | 100 kV/us |
| Supply Voltage Range | 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 | 2.25 V to 5.5 V |
| Default Output State | High (default high output) | High | High | High (ISO7842) | High |
关键差异点
- Reinforced 2000 Vrms VIOWM with 14.5 mm creepage （对比 ISO7731DW)
- Reverse channel included in 2/1 configuration （对比 ISO7830DW)
- 8000 VPK surge rating at 100 Mbps （对比 ISO7842DW)
设计说明
Place 0.1 uF ceramic decoupling capacitors within 2 mm of both VCC1 and VCC2 pins, each with a low-impedance return to its own GND1/GND2 reference. Keep the isolation gap under the package free of any copper or traces on all PCB layers to preserve the 14.5 mm creepage path. Route signals on side 1 and side 2 in physically separated regions to avoid capacitive coupling across the barrier.
The ISO7831's fixed 11 ns propagation delay and 1 ns pulse-width distortion must be included in PWM dead-time and SPI timing budget calculations. At 100 Mbps, series-terminate side-2 outputs (22-33 ohm) to control ringing into capacitive gate-driver loads. The default-high output state defines the safe fail condition during power loss - verify your power stage is safe with outputs held high when supply is absent.
Both supply domains accept 2.25 V to 5.5 V, but current consumption rises with signaling rate; budget supply current at 100 Mbps rather than quiescent values when sizing the isolated DC-DC (e.g., a B0505S or fly-buck). Ensure each supply is locally regulated and never let VCC float - floating VCC forces undefined outputs despite the default-high specification.
合规信息
Safety certifications per TI datasheet: UL 1577, IEC 60747-17 (VDE), CSA. RoHS and lead-free per TI product page; REACH and halogen-free status not stated in provided data.
