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ISO7731DBQ
Texas Instruments
DGTL ISO 3000VRMS 3CH GP 16SSOP
1273 Pcs New Original In Stock
General Purpose Digital Isolator 3000Vrms 3 Channel 100Mbps 85kV/µs CMTI 16-SSOP (0.154", 3.90mm Width)
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ISO7731DBQ
Product Overview
1317178
DiGi Electronics Part Number
ISO7731DBQ-DGManufacturer
Texas Instruments
ISO7731DBQ
Description
DGTL ISO 3000VRMS 3CH GP 16SSOPInventory
1273 Pcs New Original In Stock
General Purpose Digital Isolator 3000Vrms 3 Channel 100Mbps 85kV/µs CMTI 16-SSOP (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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ISO7731DBQ Technical Specifications
Category
Digital Isolators
Packaging
Tube
Series
-
Product Status
Active
Technology
Capacitive Coupling
Type
General Purpose
Isolated Power
No
Number of Channels
3
Inputs - Side 1/Side 2
2/1
Channel Type
Unidirectional
Voltage - Isolation
3000Vrms
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)
1.3ns, 1.4ns
Voltage - Supply
2.25V ~ 5.5V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.154", 3.90mm Width)
Supplier Device Package
16-SSOP
Base Product Number
ISO7731
Datasheet & Documents
Manufacturer Product Page
ISO7731DBQ Specifications
HTML Datasheet
ISO7731DBQ-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
296-47416
Standard Package
75
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
항상 빠른 응대와 친절한 미소가 기억에 남아요.
de desembre 02, 2025
環境に配慮した包装とスピーディな配送に満足しています。安心して買い物できました。
de desembre 02, 2025
DiGi Electronics consistently ships on time, which I greatly appreciate.
de desembre 02, 2025
The streamlined order handling process makes procurement hassle-free and efficient.
de desembre 02, 2025
DiGi Electronics' after-sales team is always available to assist, which greatly enhances our confidence.
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Frequently Asked Questions (FAQ)
Can the ISO7731DBQ safely replace an ADuM130D in a high-noise industrial motor drive application where common-mode transients exceed 75kV/µs?
Yes, the ISO7731DBQ is a strong candidate for replacing the ADuM130D in high-noise environments due to its superior 85kV/µs minimum CMTI rating, which exceeds typical transient levels in industrial motor drives. Unlike the ADuM130D’s 75kV/µs CMTI, the ISO7731DBQ provides additional margin against latch-up or data corruption during fast voltage swings on the power bus. However, verify that your system’s isolation voltage requirement (up to 3000Vrms) and channel directionality (2/1 unidirectional) match the application. Also, note that the ISO7731DBQ uses capacitive isolation, which may have different EMI characteristics than the ADuM130D’s magnetic coupling—ensure proper PCB layout with guard rings and ground separation to maintain performance.
What are the risks of using the ISO7731DBQ in a 5V-only system without isolated power rails, and how can signal integrity be maintained?
The ISO7731DBQ does not include isolated power—it only isolates signals—so both sides must be powered by separate, clean 2.25V to 5.5V supplies. In a 5V-only system without true galvanic isolation of power, the risk lies in ground loops or noise coupling through shared return paths, which can compromise the intended isolation benefits. To mitigate this, use isolated DC-DC converters (e.g., TI’s DCH010505) to generate independent side-2 power, and ensure at least 8mm creepage distance on the PCB between primary and secondary sides. Without proper power isolation, transient immunity and long-term reliability may degrade, especially in harsh environments.
How does the propagation delay mismatch in the ISO7731DBQ affect timing-critical SPI communication when replacing a slower optocoupler-based isolator?
The ISO7731DBQ has tightly matched propagation delays (16ns max for both tpLH and tpHL) and low pulse width distortion (4.9ns max), making it well-suited for high-speed SPI daisy-chain or multi-slave configurations where timing skew is critical. When replacing slower optocouplers like the HCPL-0721 (which can have >100ns delay and high skew), the ISO7731DBQ significantly reduces inter-channel timing errors and enables reliable 100Mbps operation. However, ensure your microcontroller’s SPI clock phase and polarity settings account for the fixed ~16ns delay—adjust sampling points in firmware if precise synchronization with non-isolated peripherals is required.
Is the ISO7731DBQ suitable for long-term operation in automotive under-hood environments, and what derating or layout precautions are necessary?
Yes, the ISO7731DBQ is rated for -55°C to +125°C operation and is AEC-Q100 qualified (implied by TI’s automotive-grade packaging and MSL 2 rating), making it suitable for under-hood applications. However, at elevated temperatures near 125°C, leakage currents across the isolation barrier increase slightly—ensure your system design tolerates this in safety-critical feedback paths. Additionally, follow TI’s layout guidelines: maintain ≥3.9mm creepage on the 16-SSOP package, avoid routing high-speed traces over split planes beneath the device, and use thermal vias sparingly to prevent mechanical stress. Long-term reliability is enhanced by avoiding continuous operation at maximum data rate and voltage simultaneously.
Can the ISO7731DBQ be used bidirectionally on any of its three channels, and what are the implications for UART or I2C isolation designs?
No, the ISO7731DBQ has a fixed unidirectional channel configuration (2 channels from side 1 to side 2, 1 channel from side 2 to side 1), so it cannot support true bidirectional communication like I2C without external circuitry. For UART isolation, this is typically acceptable since TX/RX are unidirectional—map accordingly. However, for I2C, you would need to add direction-control logic (e.g., a GPIO-controlled buffer) or consider a bidirectional isolator like the ISO1540 instead. Using the ISO7731DBQ for I2C without such logic risks bus contention and signal corruption. Always verify signal flow directionality during schematic review to avoid functional failures in prototype testing.
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ISO7731DBQ CAD Models
Texas Instruments ISO7731DBQ PCB symbols & footprints
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