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Skyworks Solutions Inc. SI8645BT-IS2R
- Part No.:
- SI8645BT-IS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-IS2R.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:1,024
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Product details
Overview
SI8645BT-IS2R from Skyworks is a quad-channel, 5 kVRMS reinforced-isolation digital isolator in wide-body SOIC-16 (IS2) package with 4 input channels, 0 output-side inputs, 150 Mbps data rate, <10 ns propagation delay, and selectable low-default fail-safe mode. It enables robust signal transmission across high-voltage barriers in isolated power supplies and motor control interfaces.
For engineers reviewing the SI8645BT-IS2R datasheet, SI8645BT-IS2R pinout, SI8645BT-IS2R application, or SI8645BT-IS2R equivalent, this page delivers verified electrical specs, safety certifications (UL, VDE 0884-10, CQC), thermal performance (–40 to 125 °C), and design-critical timing parameters including 0.5 ns channel-channel skew and 5 ns minimum pulse width.
Technical Context
The SI8645BT-IS2R implements RF-based on/off keying isolation with no start-up initialization required, delivering stable operation across –40 to 125 °C ambient temperature and 2.5–5.5 V supply range. Its architecture provides inherent noise immunity via Schmitt trigger inputs and supports tri-state outputs via dedicated enable logic.
All four channels reside on the input side (VDD1), with outputs referenced to VDD2 - matching the Si8645 family's 4:0 channel configuration. The IS2 package variant features tie-bar-free construction for 8 mm creepage while retaining standard WB SOIC-16 land pattern compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation per UL 1577 and VDE 0884-10; enables use in medical (IEC 60601-1) and industrial (IEC 62368-1) safety-critical systems. |
| Data Rate | DC to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clock distribution. |
| Propagation Delay | 5.0–13.0 ns (typ. 8.0 ns) - ensures tight timing alignment in real-time motor control and power converter feedback loops. |
| Channel-Channel Skew | 0.4–2.5 ns (typ. 0.5 ns) - maintains phase coherence across all four isolated signals for synchronized sampling or PWM gating. |
| Supply Current @ 100 Mbps | 3.6–22.8 mA per side (VDD1/VDD2) - ultra-low power enables battery-backed or energy-constrained isolated monitoring nodes. |
| Common-Mode Transient Immunity | 60–100 kV/µs (Si864xxT grade) - suppresses fast transients in high-dv/dt environments like traction inverters and SMPS gate drivers. |
| Fail-Safe Default | Low-output state during VDD1 loss - prevents undefined states in isolated enable/control lines for IGBT/MOSFET gate drivers. |
| Operating Temperature | –40 to 125 °C - qualified for under-hood automotive (AEC-Q100) and industrial automation deployments. |
Pinout & Package
SI8645BT-IS2R uses a 16-pin wide-body SOIC package (IS2 variant) with 8 mm creepage, tie-bar-free construction, and JEDEC-standard 260 °C reflow profile. Pinout follows Si8645 functional mapping: Channels A1–A4 on VDD1 side, B1–B4 on VDD2 side, with no enable pins (EN1/EN2 not connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1 Power Supply | Input-side supply rail (2.5–5.5 V); bypass capacitor required at each pin for noise suppression. |
| 5, 6, 7, 8 | A1–A4 Inputs | Digital input channels referenced to VDD1/GND1; Schmitt-triggered for >400 mV hysteresis and EMI resilience. |
| 9, 10, 11, 12 | B1–B4 Outputs | Isolated output channels referenced to VDD2/GND2; 50 Ω nominal output impedance for controlled-impedance PCB routing. |
| 13, 14 | GND1, GND2 | Separate ground references for input and output domains; mandatory physical separation per creepage/clearance requirements. |
| 15, 16 | VDD2 Power Supply | Output-side supply rail (2.5–5.5 V); independent of VDD1, enabling level-shifting and dual-supply system partitioning. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated 10 kV surge capability and 60-year lifetime at rated working voltage - eliminates need for external transient protection in Class I/II equipment. |
| RF-based isolation architecture | No optical degradation or LED aging; stable propagation delay and CMTI over full temperature and lifetime - critical for closed-loop control accuracy. |
| Selectable fail-safe default (low) | Guaranteed logic-low output when VDD1 is unpowered - prevents unintended activation of downstream power stages during brownout or startup. |
| Tri-state outputs without enable pins | Outputs remain active (non-high-Z) at all times - simplifies system-level control logic by removing need for external EN signal routing. |
| Ultra-low power at 100 Mbps | Typ. 5.5 mA per channel at 5 V - reduces thermal load in densely packed isolated gate driver modules and multi-channel sensor interfaces. |
| Wide supply range (2.5–5.5 V) | Interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters - lowers BOM count in mixed-voltage systems. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Isolating PWM gate-drive signals from MCU to IGBT half-bridge in variable-frequency drives. IC Role / Device Role / Timing Role: Quad-channel digital isolator transmitting four independent gate-control signals with sub-10 ns timing precision and 0.5 ns inter-channel skew. Use Value: Enables precise dead-time control and prevents shoot-through faults in high-power inverters operating up to 20 kHz switching frequency. |
Use Scenario: Providing isolated feedback for secondary-side voltage regulation in offline AC/DC converters. IC Role / Device Role / Timing Role: Transmitting error amplifier output and synchronous rectifier timing across isolation barrier with 150 Mbps bandwidth. Use Value: Supports fast transient response and high-efficiency ZVS/ZCS topologies by preserving analog control loop integrity across 5 kVRMS barrier. |
| Medical Isolated Data Acquisition | Automotive On-Board Charger (OBC) |
Use Scenario: Isolating patient-connected sensor front-end (ECG, EEG) from digital processing unit in diagnostic equipment. IC Role / Device Role / Timing Role: Four-channel isolator separating analog-to-digital conversion clocks, data lines, and trigger signals between isolated domains. Use Value: Meets IEC 60601-1 reinforced insulation requirements while maintaining <5 ns pulse fidelity for accurate waveform capture. |
Use Scenario: Isolating CAN communication and DC-link voltage sensing in bidirectional OBC units for EVs. IC Role / Device Role / Timing Role: Delivering galvanic isolation for control signals between low-voltage MCU and high-voltage battery interface. Use Value: Achieves AEC-Q100 Grade 0 qualification and 125 °C operation - ensuring reliability in under-hood thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2402BRWZ | 4-channel, 2.5 kVRMS, 25 Mbps max data rate, 35 ns propagation delay, SOIC-16 narrow body. | Limited to lower-speed industrial interfaces; lacks reinforced VDE 0884-10 and automotive qualification. | Choose for cost-sensitive, non-safety-critical 25 Mbps applications where creepage >5 mm is not required. |
| ISO6741QDWR | 4-channel, 5 kVRMS, 50 Mbps max data rate, 22 ns propagation delay, SOIC-16 wide body, AEC-Q100 qualified. | Lower bandwidth and higher latency than SI8645BT-IS2R; suitable for CAN/LIN bus isolation but not high-speed ADC clocking. | Prefer for automotive subsystems requiring 50 Mbps isolation with TI's process consistency, but not for >100 Mbps timing-critical paths. |
Compared with ADUM2402BRWZ and ISO6741QDWR, SI8645BT-IS2R delivers 3× higher data rate, 3× lower propagation delay, and VDE 0884-10 reinforced certification - making it uniquely suited for next-generation EV chargers, servo drives, and medical imaging systems demanding both speed and safety compliance.
Availability
SI8645BT-IS2R is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, medical data acquisition, and automotive on-board chargers requiring stable component supply and long-term lifecycle support.
Supply support for SI8645BT-IS2R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies.
The Si864x family was designed specifically for high-reliability, high-speed digital isolation in safety-critical power conversion, motor control, and automotive systems - emphasizing low power, precise timing, and certified reinforced insulation.
FAQ
What is the isolation rating and safety certification status of SI8645BT-IS2R?
SI8645BT-IS2R provides 5 kVRMS reinforced isolation certified to UL 1577, VDE 0884-10 (reinforced), CSA 5A, CQC GB4943.1, and IEC 62368-1. It meets reinforced insulation requirements for medical (IEC 60601-1) and industrial equipment, with 10 kV surge capability and 60-year lifetime at rated voltage. SI8645BT-IS2R is not automotive-grade (no "-A" suffix), but operates from –40 to 125 °C.
Does SI8645BT-IS2R support tri-state outputs, and how is output control implemented?
SI8645BT-IS2R does not include enable inputs (EN1/EN2 are No Connect per Table 3.2), so its outputs are always active and do not enter high-impedance state. This differs from Si8640/Si8641 variants that support tri-state via EN pins. SI8645BT-IS2R is optimized for continuous signal transmission in gate drive and feedback applications where output disable is unnecessary.
What is the default output behavior of SI8645BT-IS2R during input-side power loss?
SI8645BT-IS2R is ordered with low-default fail-safe mode (indicated by "B" in part number). When VDD1 is unpowered but VDD2 remains active, all four outputs (B1–B4) default to logic low within 12 ns (tSD). This prevents unintended activation of downstream power devices during brownout or startup sequences.
How does the IS2 package variant differ from standard wide-body SOIC for SI8645BT-IS2R?
The IS2 package for SI8645BT-IS2R eliminates internal tie bars to achieve 8 mm creepage distance while maintaining identical footprint and land pattern to standard WB SOIC-16. This enables enhanced high-voltage spacing without PCB layout changes - critical for designs targeting IEC 61800-5-1 or UL 61800-5-1 compliance in motor drives and industrial inverters.
What supply voltage ranges and power consumption can be expected from SI8645BT-IS2R at 100 Mbps?
SI8645BT-IS2R operates from 2.5 V to 5.5 V on both VDD1 and VDD2 sides. At 100 Mbps and 5 V supply, typical current draw is 5.5 mA per channel on VDD2 and 3.6 mA per channel on VDD1 (total ~36 mA for all four channels), enabling efficient high-speed isolation in thermally constrained modules.
SI8645BT-IS2R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 60kV/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:
- 2.375V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8645BT-IS2R FAQ
1.How can I place an order for SI8645BT-IS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-IS2R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI8645BT-IS2R reliable?
The price and inventory of SI8645BT-IS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-IS2R is usually 5 days.
3.What payment methods are accepted for SI8645BT-IS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-IS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-IS2R?
SI8645BT-IS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-IS2R order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI8645BT-IS2R?
For technical support, including SI8645BT-IS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-IS2R requirements.
6.How does Aetrix verify that SI8645BT-IS2R is sourced from the original manufacturer or authorized distributors?
All SI8645BT-IS2R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI8645BT-IS2R meets industry standards.
7.What is the process for return or replacement of SI8645BT-IS2R?
All SI8645BT-IS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-IS2R, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI8645BT-IS2R part is unused and in its original packaging.
Return procedure for SI8645BT-IS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-IS2R Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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