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SI8645BB-B-IS1
Skyworks Solutions Inc.
DGTL ISO 2500VRMS 4CH GP 16SOIC
1404 Pcs New Original In Stock
General Purpose Digital Isolator 2500Vrms 4 Channel 150Mbps 35kV/µs CMTI 16-SOIC (0.154", 3.90mm Width)
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5.0 / 5.0
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SI8645BB-B-IS1
Product Overview
7976962
DiGi Electronics Part Number
SI8645BB-B-IS1-DGManufacturer
Skyworks Solutions Inc.
SI8645BB-B-IS1
Description
DGTL ISO 2500VRMS 4CH GP 16SOICInventory
1404 Pcs New Original In Stock
General Purpose Digital Isolator 2500Vrms 4 Channel 150Mbps 35kV/µs CMTI 16-SOIC (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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SI8645BB-B-IS1 Technical Specifications
Category
Digital Isolators
Packaging
Tube
Series
Si864x
Product Status
Active
Technology
Capacitive Coupling
Type
General Purpose
Isolated Power
No
Number of Channels
4
Inputs - Side 1/Side 2
4/0
Channel Type
Unidirectional
Voltage - Isolation
2500Vrms
Common Mode Transient Immunity (Min)
35kV/µs
Data Rate
150Mbps
Propagation Delay tpLH / tpHL (Max)
13ns, 13ns
Pulse Width Distortion (Max)
4.5ns
Rise / Fall Time (Typ)
2.5ns, 2.5ns
Voltage - Supply
2.5V ~ 5.5V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.154", 3.90mm Width)
Supplier Device Package
16-SOIC
Base Product Number
SI8645
Datasheet & Documents
HTML Datasheet
SI8645BB-B-IS1-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
336-4708
SI8645BB-B-IS1-DG
Standard Package
48
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
매우 견고하고 세밀하게 만들어져서 오랫동안 쓸 수 있을 것 같아요. 배송도 너무 빠른 편입니다.
Dec 02, 2025
친절한 응대 덕분에 처음 방문했는데 이미 재방문 의사가 생겼어요.
Dec 02, 2025
售後服務一流，處理問題迅速又專業，讓我非常放心選擇他們的公司。
Dec 02, 2025
Die Unterstützung nach dem Kauf war erstklassig. Fragen wurden sofort und professionell beantwortet.
Dec 02, 2025
DiGi Electronics's logistics team is efficient and dependable.
Dec 02, 2025
Pricing clarity is a highlight, making budgeting straightforward.
Dec 02, 2025
The variety of products available ensures we can keep our classrooms well-equipped.
Dec 02, 2025
Their competitive prices are ideal for hobbyists and professionals alike.
Dec 02, 2025
Fast shipping processes mean I can rely on DiGi Electronics for urgent needs.
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Frequently Asked Questions (FAQ)
What are the key reliability risks when using the SI8645BB-B-IS1 in high-voltage industrial environments, and how can I mitigate them despite its 2500Vrms isolation rating?
While the SI8645BB-B-IS1 offers a 2500Vrms isolation voltage, sustained exposure to high dV/dt transients or nearby lightning-induced surges can stress the capacitive isolation barrier over time. To mitigate reliability risks, always include external transient voltage suppression (TVS) diodes on both input and output sides, maintain proper creepage and clearance distances (>8mm recommended for reinforced insulation), and avoid routing noisy power traces near the isolator. Additionally, consider derating the isolation voltage by 20–30% for long-term field reliability in harsh environments.
Can the SI8645BB-B-IS1 safely replace a legacy optocoupler like the HCPL-0721 in a 24V PLC input module, and what design changes are necessary?
Yes, the SI8645BB-B-IS1 can replace the HCPL-0721, but critical design changes are required: first, the SI8645BB-B-IS1 is unidirectional and requires separate channels for each signal direction—unlike some optocouplers that support bidirectional logic. Second, it needs clean, regulated 2.5V–5.5V supplies on both sides; you cannot power it directly from 24V logic. Add level-shifting circuitry on the field side and ensure ground isolation between the 24V and logic domains. Also, verify timing compatibility—the SI8645BB-B-IS1’s 13ns propagation delay is much faster than the HCPL-0721’s ~200ns, which may affect debounce or filtering logic.
How does the SI8645BB-B-IS1 compare to the TI ISO7741 in terms of CMTI and real-world noise immunity for motor drive applications?
The SI8645BB-B-IS1 provides 35kV/µs minimum CMTI, which is competitive with the TI ISO7741’s typical 50kV/µs but falls short in worst-case scenarios. In high-noise motor drive environments with fast-switching IGBTs or SiC MOSFETs, this difference can manifest as occasional glitches on the isolated side. If your system operates near the edge of EMI tolerance, consider adding RC filters on the SI8645BB-B-IS1 outputs or opting for the ISO7741 if budget allows. However, for most general-purpose inverter controls below 100kHz switching, the SI8645BB-B-IS1 performs reliably with proper layout.
What layout practices are critical to maintain signal integrity and isolation performance when routing high-speed signals through the SI8645BB-B-IS1 in a compact PCB design?
To preserve the SI8645BB-B-IS1’s 150Mbps capability and 35kV/µs CMTI, avoid splitting ground planes under the device—instead, use a solid, uninterrupted ground reference on each side. Keep input and output traces short and symmetric to minimize skew, and never route high-dV/dt traces (e.g., switching node signals) across the isolation barrier area. Maintain at least 2x the package width (≈8mm) of clearance between primary and secondary side copper. Use guard rings tied to local grounds on both sides to reduce parasitic coupling, and ensure the 16-SOIC package is soldered without voids to prevent moisture ingress over time.
Is the SI8645BB-B-IS1 suitable for functional safety applications up to SIL 2, and what documentation or certifications should I request from Skyworks?
The SI8645BB-B-IS1 is not inherently certified for functional safety (e.g., IEC 61508), so using it in SIL 2 systems requires a rigorous FMEDA (Failure Modes, Effects, and Diagnostic Analysis) and system-level assessment. Skyworks does not provide full safety manuals or certified FIT rates for this part, unlike some competitors (e.g., Analog Devices ADuM series). If your application demands certified isolation for safety, consider a dedicated safety isolator. However, for non-certified redundancy or diagnostic-enhanced designs where the SI8645BB-B-IS1 is one layer of protection, it can be used—but you must validate fault tolerance, include periodic self-tests, and document all assumptions in your safety case.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
SI8645BB-B-IS1 CAD Models
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