ISO7741DWR - 4-Ch 3/1 100Mbps 5kVrms Digital Isolator | Texas Instruments
MPN: ISO7741DWR ✓ Hoạt độngISO7741DWR Tóm tắt
A digital isolator is a semiconductor device that transfers data across a galvanic isolation barrier using capacitive, inductive (transformer), or optical coupling while blocking DC and low-frequency voltages. The ISO7741 belongs to the digital isolator family within the broader interface IC and signal-isolation hierarchy, and is widely used to protect low-voltage logic domains from high-voltage transients in industrial systems, motor drives, and renewable-energy converters. Its reinforced insulation rating supports safety-critical designs that must meet UL 1577, VDE, CSA, TUV, and CQC requirements.
Key features of the ISO7741DWR include integrated enable pins on side-2 outputs (EN2) and selectable default-high/low outputs (ISO7741F variant), robust EMC performance verified through IEC 61000-4-2 ESD and IEC 61000-4-6 RF-immunity tests, low 1.5 ns typical propagation delay, low power consumption with 1.6 mA per channel typical supply current at 1 Mbps, and wide -55 °C to +125 °C operating temperature. The wide-body SOIC-16 (DW) footprint provides sufficient creepage and clearance to meet 5000 Vrms reinforced isolation ratings.
Internally, the ISO7741 uses TI's silicon-oxide (SiO2) capacitive isolation barrier with on-chip encoding and decoding that delivers high immunity to RF fields and fast transients. The differential signalling across the isolation barrier rejects common-mode noise and supports DC correctness even across long cable runs and noisy industrial environments.
Typical applications include isolated SPI/UART interfaces in factory automation, gate-driver signal isolation for IGBT/MOSFET power stages, isolated data acquisition front ends, isolated USB and RS-485 links, solar inverter communications, and EV battery management system (BMS) communications. Designers pair it with companion gate drivers, isolated DC/DC converters, and reinforced isolated RS-485 transceivers to complete a robust isolated signal chain.
When designing with the ISO7741DWR, observe the 5000 Vrms isolation voltage rating and follow UL 1577 / VDE 0884 creepage requirements. Decouple both VCC1 and VCC2 supplies with 0.1 µF and 1 µF ceramic capacitors placed close to the device pins, and ensure that the high-voltage side maintain safe spacing of the wide-body SOIC land pattern to meet regulatory clearance.
This page synthesizes distributor stock, drop-in alternatives including same-brand reinforced and basic variants, cross-brand Si8641/ADuM141x equivalents, and practical design notes not found in the bare manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ISO7741DWR — 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 ISO7741DWR (cùng hình factor và footprint) — khác nhau ở Channel Direction, Common-Mode Transient Immunity (CMTI), MSL Level, Number of Channels, Operating Temperature.
ISO7741DWR-Q1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7741DWR Thông số kỹ thuật
| Isolation Type | Capacitive (SiO2) |
| Number of Channels | 4 |
| Channel Direction | 3 forward / 1 reverse (3/1) |
| Tốc độ dữ liệu | 100 Mbps |
| Isolation Voltage (DW package) | 5000 Vrms |
| Common-Mode Transient Immunity (CMTI) | 85 kV/µs (minimum) |
| Propagation Delay (typical) | 1.5 ns |
| Supply Voltage Range | 2.25 V to 5.5 V (per side) |
| Supply Current per Channel (typ. @ 1 Mbps) | 1.6 mA |
| Nhiệt độ hoạt động | -55 C to +125 C |
| Hộp | SOIC-16 (DW) wide-body, 0.295 inch / 7.50 mm width |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 |
| Trạng thái RoHS | Compliant |
| UL 1577 Recognition | Recognized component |
Cấu hình chân ISO7741DWR
| Chân 1 | VCC1 — Side-1 power supply, 2.25 V to 5.5 V |
| Chân 2 | IN1 — Side-1 digital input, channel 1 |
| Chân 3 | IN2 — Side-1 digital input, channel 2 |
| Chân 4 | IN3 — Side-1 digital input, channel 3 |
| Chân 5 | NC — Not connected (per datasheet) |
| Chân 6 | GND1 — Side-1 ground return |
| Chân 7 | NC — Not connected (per datasheet) |
| Chân 8 | OUT4 — Side-1 digital output, channel 4 (reverse direction) |
| Chân 9 | GND2 — Side-2 ground return |
| Chân 10 | EN2 — Side-2 output enable, active high (low = high-Z) |
| Chân 11 | OUT3 — Side-2 digital output, channel 3 |
| Chân 12 | OUT2 — Side-2 digital output, channel 2 |
| Chân 13 | OUT1 — Side-2 digital output, channel 1 |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | VCC2 — Side-2 power supply, 2.25 V to 5.5 V |
| Chân 16 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ISO7741DWR phù hợp cho 7 Áp dụngs: Industrial Motor Drive IGBT Gate Driver Isolation, Solar Inverter Communication and Control Isolation, Isolated SPI / UART for Factory Automation PLCs, Electric Vehicle Battery Management System (BMS) Isolation, Medical Equipment Patient-Isolation Interface, Isolated RS-485 / RS-422 Communication Link, Data Center Isolated Power-Good and Hot-Swap Control.
Industrial Motor Drive IGBT Gate Driver Isolation
The ISO7741DWR isolates gate-driver control signals between a low-voltage MCU/FPGA and the high-voltage IGBT half-bridge in industrial motor drives. Its 5000 Vrms reinforced isolation (per UL 1577 and VDE 0884-11) blocks the DC-bus voltage on the high-voltage side, while the 85 kV/us minimum CMTI rejects the high dv/dt transients generated by IGBT and SiC MOSFET switching. With 100 Mbps data rate and 1.5 ns typical propagation delay, the part maintains timing accuracy for short-dead-time PWM schemes. Typical circuit: ISO7741DWR sits between the MCU PWM outputs (3 forward channels for 3-phase PWM) and the gate driver inputs, with the 1 reverse channel carrying a fault signal back. Decouple VCC1 and VCC2 with 0.1 uF + 1 uF ceramics placed within 2 mm of the device pins.
Được đề xuất
Solar Inverter Communication and Control Isolation
In string and central solar inverters, the ISO7741DWR provides reinforced signal isolation between the high-voltage DC-side controller and the low-voltage communication/MCU side. The 5 kVrms rating covers the 1500 V DC-bus maximum of modern string inverters, while the wide -55 C to +125 C operating range tolerates outdoor cabinet environments. Its 100 Mbps data rate supports isolated SPI between the power-stage controller and the inverter's MPPT engine. The 3 forward / 1 reverse channel direction maps naturally to 3-phase PWM plus 1 fault-return path. Designers typically pair the ISO7741DWR with an isolated DC-DC converter (e.g. SN6505B or UCC12050) to derive the side-2 supply from the side-1 rail across the same isolation barrier.
Được đề xuất
Isolated SPI / UART for Factory Automation PLCs
Programmable Logic Controllers (PLCs) and distributed I/O modules use the ISO7741DWR to bridge field-side sensors and actuators with the backplane logic controller across a 5 kVrms barrier. Its 100 Mbps channel speed easily covers 12 Mbps SPI and 1 Mbps UART with ample timing margin, while the 3/1 channel direction fits full-duplex UART (TX, RX, RTS, CTS) or SPI plus a chip-select return. Robust EMC immunity per IEC 61000-4-2 ESD and IEC 61000-4-6 RF-immunity tests makes the ISO7741DWR tolerant of the radiated-noise environment typical of motor-control cabinets. Use EN2 to gate side-2 outputs during backplane hot-swap events without disturbing the link.
Được đề xuất
Electric Vehicle Battery Management System (BMS) Isolation
In EV battery management systems, the ISO7741DWR isolates the high-voltage battery monitoring ASIC from the 12 V vehicle bus. The 5 kVrms rating exceeds the 800 V DC-bus requirement of modern EV packs with substantial margin, and the AEC-Q100 automotive variant (ISO7741DWR-Q1) qualifies the part for vehicle use. The 100 Mbps data rate supports daisy-chained battery-cell monitoring ICs (e.g. BQ79616-Q1) where cell telemetry is time-multiplexed across the isolation barrier. The 3/1 channel direction cleanly hosts SPI plus fault-return. Pair with an isolated CAN-FD transceiver for the high-voltage to chassis communications.
Được đề xuất
Medical Equipment Patient-Isolation Interface
Patient-monitoring medical devices such as infusion pumps, ECG monitors, and ventilators use the ISO7741DWR to provide reinforced patient-side isolation from line-powered circuitry, meeting IEC 60601-1 means-of-patient-protection requirements. The 5 kVrms reinforced rating and the wide creepage of the wide-body SOIC-16 (DW) package achieve 2x MOPP (means of patient protection) compliance. The 100 Mbps bandwidth preserves high-fidelity ECG sample-clock timing across the barrier. Because the device is capacitive-coupled, no magnetically-induced EMI disturbs the high-impedance patient front-end. Use low-ESR decoupling on both sides and route the barrier end through the PCB keep-out area to maximize creepage.
Được đề xuất
Isolated RS-485 / RS-422 Communication Link
Industrial RS-485 / RS-422 links commonly pair the ISO7741DWR with an isolated transceiver (e.g. THVD1450 or ISL3179E) to build a bus node that survives 10 kV ESD and 4 kV surge events. The 3 forward channels carry DE/RE/Driver-Data while the 1 reverse channel brings RX data back to the UART, eliminating the need for two separate isolators. The 5 kVrms barrier (UL 1577 recognized) and the 85 kV/us CMTI reject the ground-potential-rise noise that propagates through long cable runs in factory floors and outdoor telecom cabinets. Use a 1 Mbaud data rate for maximum noise margin over long cables and to stay within 1 unit interval (UI) of the isolator's worst-case propagation delay.
Được đề xuất
Data Center Isolated Power-Good and Hot-Swap Control
Server hot-swap controllers and OR-ing power-management blocks in 48 V data-center backplanes use the ISO7741DWR to propagate power-good, fault, and load-share signals across the safety-isolation barrier. The 5 kVrms reinforced rating lets the same isolator carry primary-side high-voltage signals to the low-voltage BMC, eliminating the need for a separate analog isolator for high-voltage telemetry. Its 100 Mbps speed and 1.5 ns propagation delay enable deterministic fault propagation for sub-microsecond overcurrent protection. The EN2 pin is useful for synchronizing side-2 outputs to backplane presence detection during card insertion.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISO7741DWR — 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 | ISO7741DWR-Q1 | Si8641BB-B-IS1 | ADuM141E |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Silicon Labs | Analog Devices |
| Package | SOIC-16 (DW) wide-body | SOIC-16 (DW) wide-body | SOIC-16 wide-body | SOIC-16 wide-body |
| Number of Channels | 4 | 4 | 4 | 4 |
| Channel Direction | 3/1 | 3/1 | 3/1 | 3/1 |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5000 Vrms | 3750 Vrms (basic) / 5000 Vrms (reinforced grade) |
| Data Rate | 100 Mbps | 100 Mbps | 150 Mbps | 25 Mbps (E-grade) / 150 Mbps (A-grade) |
| CMTI (min) | 85 kV/us | 85 kV/us | 50 kV/us | 100 kV/us |
| Automotive Grade (AEC-Q100) | No (commercial/industrial) | Yes (AEC-Q100) | No | AEC-Q100 -Q variants available |
Bảo phân biệt quan trọng
- Highest CMTI in TI 5 kVrms digital-isolator family (vsISO7741DWR vs ISO7731DWR)
- Wide-body SOIC footprint with reinforced 5 kVrms rating (vsISO7741DWR vs Si8641BB-B-IS1)
- Capacitive SiO2 isolation barrier, no magnetic emissions (vsISO7741DWR vs ADuM141E)
- Automotive-grade variant available with same pinout (vsISO7741DWR vs Si8641BB-B-IS1)
Ghi chú thiết kế
Place 0.1 uF and 1 uF decoupling capacitors on both VCC1 (pin 1) and VCC2 (pin 15) within 2 mm of the device pins to keep the high-speed SiO2 capacitive isolation barrier fed by low-impedance supplies. Maintain a continuous ground plane on each side of the barrier and do not run signal traces under the SOIC-16 (DW) body, since the wide-body land pattern requires the full creepage of the device package for 5 kVrms reinforced isolation. Add a 4 mm minimum cutout in the inner copper layers directly beneath the device body to preserve high-voltage clearance across the PCB.
Both VCC1 and VCC2 must be ramped monotonically to avoid logic glitching on the output during power-up. The EN2 pin (pin 10) can be tied directly to VCC2 if always-on side-2 outputs are required, but it must NOT be left floating - an undriven EN2 can drift into the logic threshold band and cause intermittent high-Z behavior. For hot-swap or backplane applications, drive EN2 from the host controller so that side-2 outputs are gated only after VCC2 is stable.
Do not confuse ISO7741 with ISO7740 (4/0 direction) or ISO7742 (2/2 direction) when building an isolated SPI bus. Although all three share the same SOIC-16 (DW) footprint, the channel-direction mapping differs and a swapped part will silently mirror the wrong signals. For mixed-direction SPI designs, use ISO7741 (3 forward / 1 reverse) for SPI plus chip-select return, ISO7742 (2/2) for full-duplex UART, or ISO7740 (4/0) for one-way PWM isolation. Estimated: typical quiescent current at 5 V supply with no data activity is approximately 1.5 mA per side per TI datasheet.
Although the ISO7741 uses capacitive SiO2 isolation that does not radiate common-mode current like an inductive iCoupler, the side-1 / side-2 power supplies must still be well-bypassed to prevent conducted emissions from the upstream DC-DC converter from coupling across the barrier. A ferrite bead in series with VCC2 (and optionally VCC1) followed by a 10 uF + 0.1 uF ceramic stack is recommended for designs that must meet EN 55032 Class B conducted emissions. Source: TI isolation forum guidance for ISO774x EMI performance.
At 100 Mbps continuous switching on all 4 channels, the ISO7741DWR consumes approximately 30 mW per side (estimated from datasheet current vs. data rate curves). This is well within the wide-body SOIC-16 (DW) thermal envelope of approximately 800 mW at 25 C ambient, so no thermal management beyond the standard PCB copper pour is required. Above 70 C ambient, keep at least 200 mm^2 of copper on each supply-side pour to keep junction temperature rise under 15 C.
Thông tin tuân thủ
UL 1577 recognized component (5000 Vrms), VDE 0884-11 reinforced insulation, CSA, TUV, and CQC certified per TI ISO774x datasheet. RoHS/REACH compliant. -Q1 automotive variant is AEC-Q100 qualified.
