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ISO7741FDWR
Texas Instruments
DGTL ISO 5000VRMS 4CH GP 16SOIC
36151 Pcs New Original In Stock
General Purpose Digital Isolator 5000Vrms 4 Channel 100Mbps 85kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
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5.0 / 5.0
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ISO7741FDWR
Product Overview
1347880
DiGi Electronics Part Number
ISO7741FDWR-DGManufacturer
Texas Instruments
ISO7741FDWR
Description
DGTL ISO 5000VRMS 4CH GP 16SOICInventory
36151 Pcs New Original In Stock
General Purpose Digital Isolator 5000Vrms 4 Channel 100Mbps 85kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
Quantity
Minimum 1
Minimum 1
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ISO7741FDWR Technical Specifications
Category
Digital Isolators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Technology
Capacitive Coupling
Type
General Purpose
Isolated Power
No
Number of Channels
4
Inputs - Side 1/Side 2
3/1
Channel Type
Unidirectional
Voltage - Isolation
5000Vrms
Common Mode Transient Immunity (Min)
85kV/µs
Data Rate
100Mbps
Propagation Delay tpLH / tpHL (Max)
16ns, 16ns
Pulse Width Distortion (Max)
4.9ns
Rise / Fall Time (Typ)
2.4ns, 2.4ns
Voltage - Supply
2.25V ~ 5.5V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.295", 7.50mm Width)
Supplier Device Package
16-SOIC
Base Product Number
ISO7741
Datasheet & Documents
Manufacturer Product Page
ISO7741FDWR Specifications
HTML Datasheet
ISO7741FDWR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-48141-6
296-48141-2
296-48141-1
ISO7741FDWR-DG
Standard Package
2,000
Alternative Parts
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MANUFACTURER
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DiGi PART NUMBER
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5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key reliability risks when using the ISO7741FDWR in high-voltage motor drive applications, and how can I mitigate them despite its 5000Vrms isolation rating?
While the ISO7741FDWR offers a robust 5000Vrms isolation voltage, its reliability in high-voltage motor drives depends heavily on PCB layout and transient protection. The 85kV/µs CMTI is strong but can be overwhelmed by fast dV/dt transients from IGBT or MOSFET switching if ground planes under the isolator are improperly segmented or if creepage distances are insufficient. To mitigate risk, maintain ≥8mm creepage between primary and secondary sides, use guard rings, and add TVS diodes on both sides near the ISO7741FDWR. Also, avoid routing high-speed digital traces parallel to isolation barriers, as capacitive coupling can induce noise. TI’s ISO7741FDWR evaluation module demonstrates these best practices and should be referenced during layout.
Can I replace the ISO7741FDWR with the SI8641ED-B-IS2 in an existing 4-channel industrial communication design without redesigning the PCB?
Direct drop-in replacement of the ISO7741FDWR with the SI8641ED-B-IS2 is not recommended without verification, despite both being 4-channel digital isolators in 16-SOIC packages. The SI8641ED-B-IS2 uses silicon-based isolation with different propagation delay characteristics (typically 20ns vs. 16ns max on the ISO7741FDWR) and may have slightly different input threshold levels, which could affect timing margins in high-speed UART or SPI links. Additionally, the SI8641ED-B-IS2 has a lower CMTI (50kV/µs typical) compared to the ISO7741FDWR’s 85kV/µs, increasing susceptibility to noise in electrically harsh environments. If replacing, validate signal integrity under worst-case conditions and consider adding series termination resistors to dampen reflections.
How does the lack of isolated power in the ISO7741FDWR impact system design, and what power architecture should I use to ensure reliable operation in a 24V industrial control panel?
The ISO7741FDWR does not include integrated isolated power, so you must provide separate isolated DC-DC converters or regulators on both sides. In a 24V industrial panel, this means adding a small isolated converter (e.g., TI’s DCH010505 or RECOM RxxPxx series) to power the secondary side logic. Failure to use a properly rated isolated supply can lead to ground loops or compromised isolation integrity. Ensure the converter meets or exceeds the 5000Vrms isolation rating and has low coupling capacitance (<5pF) to maintain CMTI performance. Also, place bulk and bypass capacitors close to the ISO7741FDWR’s VCC1 and VCC2 pins to handle transient current demands during 100Mbps data bursts.
Is the ISO7741FDWR suitable for long-distance RS-485 communication over 100 meters, given its 100Mbps data rate and 16ns propagation delay?
The ISO7741FDWR can support long-distance RS-485, but success depends on baud rate, cable quality, and termination—not just data rate. While its 100Mbps capability exceeds typical RS-485 speeds (usually ≤10Mbps), the 16ns propagation delay per channel introduces skew in multi-channel systems, which may affect timing in daisy-chained networks. For 100-meter runs, limit the baud rate to ≤1Mbps to minimize ISI and reflections. Use shielded twisted-pair cable with proper termination (120Ω at both ends) and ensure the ISO7741FDWR’s ground domains are cleanly separated. Also, consider adding common-mode chokes and ESD protection at the transceiver interface to protect the isolator from line surges.
What are the thermal and lifetime implications of operating the ISO7741FDWR at 125°C ambient in an enclosed automotive-grade enclosure, and how does MSL 2 affect assembly?
Operating the ISO7741FDWR at its maximum rated 125°C ambient temperature reduces long-term reliability due to accelerated aging of the capacitive isolation barrier and internal metallization. While the device is rated for this temperature, continuous operation near the limit may shorten mean time between failures (MTBF), especially under high humidity or thermal cycling. To extend life, ensure adequate airflow or heatsinking if possible, and avoid sustained operation above 110°C. Additionally, the MSL 2 (1 Year) rating means the package is moderately sensitive to moisture; after opening the dry pack, the ISO7741FDWR must be reflowed within 1 year or baked per J-STD-033 if exposed to >30°C/60% RH for more than 168 hours. Always follow IPC/JEDEC guidelines during SMT assembly to prevent popcorning or delamination.
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ISO7741FDWR CAD Models
Texas Instruments ISO7741FDWR PCB symbols & footprints
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