ISO7741FDBQR - 4-Ch 100Mbps Digital Isolator | Texas Instruments
MPN: ISO7741FDBQR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.46 | $14.60 |
| 100 | $1.29 | $129.00 |
| 500 | $1.12 | $560.00 |
| 1,000 | $0.98 | $980.00 |
ISO7741FDBQR Overview
A digital isolator is an integrated circuit that transfers digital signals across an isolation barrier without a direct electrical connection, preventing ground loops and protecting low-voltage circuitry from high-voltage transients. In the system hierarchy, digital isolators are interface ICs used in isolated communication and sensor networks. The ISO774x family leverages Texas Instruments robust-EMC technology to maintain signal integrity in electrically noisy environments such as motor drives and inverters.
Key features include 3000 Vrms reinforced isolation, 100 Mbps data rate, 85 kV/us CMTI, default-low output state (F suffix) for fail-safe power-up, and a 3/1 channel configuration. The device is certified to UL 1577, VDE, CSA, TUV, and CQC, making it suitable for safety-critical applications. It operates over a -55C to +125C temperature range and is available in tape and reel packaging for high-volume production.
The ISO7741FDBQR uses an integrated isolation barrier with silicon dioxide (SiO2) insulation to transfer digital data across the barrier. The F suffix sets outputs low when the input supply is unpowered, ensuring a known state for attached microcontrollers and actuators. With 100 Mbps throughput, it supports high-speed SPI, UART, and GPIO isolation while maintaining low propagation delay (16 ns max) and high reliability. The robust-EMC design reduces the impact of radiated and conducted interference, simplifying qualification in CE-marked industrial products.
Typical applications include industrial automation PLCs, motor drives, solar inverters, medical equipment, automotive battery management systems, and isolated SPI/UART communication buses. In each, the ISO7741FDBQR provides reliable signal transfer while protecting control electronics from high-voltage spikes and ground potential differences.
Designers should ensure that supply decoupling capacitors are placed close to the device pins and that PCB layout respects creepage and clearance distances required for the isolation voltage. For default-high outputs, choose the non-F variant (ISO7741DBQR).
Drop-in alternatives for ISO7741FDBQR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO7741FDBQR (same form factor and footprint) — differing in Package, Channel Configuration, Data Rate, Number of Channels, Isolation Rating.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7741DBQR
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View Datasheet →ISO7741FQDBQRQ1
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View Datasheet →ISO7742FDBQR
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View Datasheet →ADuM1401BRWZ
⚡ Same Package📋 Reference alternative (not in catalog)
Si8641BB-B-IS
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ISO7741FDBQR Specifications
| Channel Configuration | 4 channels (3 forward / 1 reverse) |
| Data Rate | 100 Mbps |
| Isolation Rating | 3000 Vrms (UL 1577, DBQ package) |
| CMTI | 85 kV/us (min) |
| Propagation Delay (Max) | 16 ns (tpLH / tpHL) |
| Pulse Width Distortion (Max) | 4.9 ns |
| Rise / Fall Time (Typ) | 2.4 ns / 2.4 ns |
| Default Output State | Low (F suffix, fail-safe) |
| Operating Temperature | -55C to +125C |
| Package | 16-SSOP (DBQ), 3.90 mm width |
| Mounting Type | Surface Mount |
| Insulation Type | Reinforced, SiO2-based isolation barrier |
| Certifications | UL 1577, VDE, CSA, TUV, CQC |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (R suffix) |
ISO7741FDBQR Pin Configuration
| Pin 1 | VCC1 — Side 1 supply voltage |
| Pin 2 | GND1 — Side 1 ground reference |
| Pin 3 | A (IN) — Forward channel A input, side 1 |
| Pin 4 | B (IN) — Forward channel B input, side 1 |
| Pin 5 | C (IN) — Forward channel C input, side 1 |
| Pin 8 | D (OUT) — Reverse channel D output, side 1 |
| Pin 9 | VCC2 — Side 2 supply voltage |
| Pin 10 | A (OUT) — Forward channel A output, side 2 |
| Pin 11 | B (OUT) — Forward channel B output, side 2 |
| Pin 12 | C (OUT) — Forward channel C output, side 2 |
| Pin 13 | D (IN) — Reverse channel D input, side 2 |
| Pin 16 | GND2 — Side 2 ground reference |
Typical Applications
ISO7741FDBQR is suitable for 6 applications: Isolated SPI Communication, Industrial Motor Drives and Inverters, Solar Inverters, Automotive Battery Management Systems, Medical Equipment Isolation, PLC and Industrial Automation I/O.
Isolated SPI Communication
The ISO7741FDBQR's 3/1 channel mapping is a natural fit for isolated SPI: MOSI, SCLK, and chip-select cross the barrier forward while MISO returns on the reverse channel. With 100 Mbps throughput and 16 ns max propagation delay, the device sustains SPI clocks in the tens of MHz with margin. The 85 kV/us CMTI keeps clock edges clean even when the isolated ground rides on a switching power stage. The F default-low outputs hold chip-select inactive during power-up, preventing spurious SPI transactions.
Recommended
Industrial Motor Drives and Inverters
In motor drive and inverter systems, gate-control and status signals must cross a barrier sitting on a high dv/dt switching node. The ISO7741FDBQR's 85 kV/us common-mode transient immunity prevents data corruption from IGBT or SiC switching transients, while 3000 Vrms reinforced isolation per UL 1577 satisfies safety separation from the mains-referenced power stage. The robust-EMC architecture reduces radiated emissions, easing CE compliance, and the -55C to +125C range covers enclosure temperatures near power modules.
Recommended
Solar Inverters
Grid-tied solar inverters require reinforced isolation between the low-voltage MPPT/control domain and the high-voltage DC link and AC output. The ISO7741FDBQR provides 3000 Vrms reinforced insulation certified to UL 1577, VDE, CSA, TUV, and CQC, covering major grid-interconnection approval schemes. Its 100 Mbps speed carries PWM and telemetry signals without limiting control-loop bandwidth, and the default-low fail-safe state ensures the power stage idles safely if the controller side loses power.
Recommended
Automotive Battery Management Systems
In EV and hybrid battery packs, cell-monitoring and pack-management signals must be isolated across the hundreds-of-volts pack potential. The automotive-qualified family member ISO7741FQDBQRQ1 supports such designs, and the ISO7741FDBQR serves industrial BMS variants. The 100 Mbps rate supports fast daisy-chain communication, 85 kV/us CMTI withstands pre-charge and contactor switching transients, and the -55C to +125C range accommodates under-hood and pack-mounted electronics temperatures.
Recommended
Medical Equipment Isolation
Patient-connected medical devices demand reinforced isolation to protect patients from leakage currents and mains faults. The ISO7741FDBQR's reinforced 3000 Vrms rating with VDE and TUV certifications provides the insulation level required for patient-applied-part separation, while its robust-EMC design helps systems pass IEC-grade interference testing. Low propagation delay of 16 ns preserves sampling-system timing for isolated data acquisition front ends, and the fail-safe default-low outputs keep actuators disabled during controller startup.
Recommended
PLC and Industrial Automation I/O
Programmable logic controllers isolate field wiring from the control backplane to survive ground potential differences, induced surges, and miswiring events. The ISO7741FDBQR's four channels consolidate isolated digital I/O in one 16-pin SSOP, saving board space versus discrete optocoupler solutions while offering orders-of-magnitude higher speed (100 Mbps) and longer barrier life than LED-based isolation. Its UL 1577 3000 Vrms rating and VDE/CSA/TUV/CQC certifications streamline machine-safety documentation.
Recommended
Recommended Products Summary
Engineering reference data for ISO7741FDBQR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7741DBQR | ISO7741FQDBQRQ1 | ISO7742FDBQR | ADuM1401BRWZ |
|---|---|---|---|---|---|
| Package | SSOP-16 (DBQ) | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same | SOIC-16W - verify footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Channel Configuration | 3/1 (quad) | 3/1 (quad) | 3/1 (quad) | 2/2 (quad) | 3/1 (quad) |
| Isolation Rating | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 2500 Vrms |
| CMTI | 85 kV/us | 85 kV/us | 85 kV/us | 85 kV/us | 25 kV/us (typ) |
| Default Output State | Low (F suffix) | High | Low (F suffix) | Low (F suffix) | High (standard) |
| AEC-Q100 Qualification | No (industrial) | No | Yes (Q1) | No | No |
| Operating Temperature | -55C to +125C | -55C to +125C | -55C to +125C | -55C to +125C | -40C to +125C |
Key Differentiators
- Default-low fail-safe outputs (vs ISO7741DBQR)
- Higher CMTI for inverter environments (vs ADuM1401BRWZ)
- Automotive family path (vs ADuM1401BRWZ)
Design Notes
Respect creepage and clearance requirements for reinforced 3000 Vrms isolation in the DBQ package: keep board copper and adjacent traces away from the isolation barrier region, and cut a slot under the package when possible to increase creepage distance. Do not route high-voltage nets directly beneath the isolator. Refer to the ISO774x datasheet safety-limiting and package creepage tables for values at your pollution-degree and altitude conditions.
Place a 100 nF ceramic decoupling capacitor within 2 mm of each VCC pin (VCC1 and VCC2), referenced to the respective side ground. Each side supply must be locally regulated and free of switching ripple, since supply noise couples through the barrier capacitance. Use a dedicated isolated DC-DC or isolated supply on side 2; do not share grounds between sides under any circumstance.
At data rates above 50 Mbps, keep barrier-crossing traces short and route inputs/outputs as matched-length pairs where timing skew matters, such as isolated SPI. Account for 16 ns max propagation delay plus 4.9 ns pulse-width distortion in the SPI timing budget. Series source termination (22-33 ohm) on the driving side reduces reflections and radiated emissions from fast 2.4 ns edges.
Confusing the F and non-F variants is the most common ordering error: the ISO7741FDBQR defaults outputs LOW when the input side is unpowered, while ISO7741DBQR defaults HIGH. A board designed expecting a default-high chip-select will hold SPI devices asserted at startup with the F part. Verify the fail-safe polarity required by the attached MCU or actuator before release, and note the F and non-F parts are otherwise pin-compatible.
Compliance Information
Safety certified to UL 1577, VDE, CSA, TUV, and CQC per TI product data. AEC-Q100 applies to the ISO7741FQDBQRQ1 variant, not this standard industrial part. REACH, halogen-free, and conflict-minerals status should be confirmed via TI material declarations.
