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Skyworks Solutions Inc. SI8645BT-IS2
- Part No.:
- SI8645BT-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:1,251
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Product details
Overview
SI8645BT-IS2 from Skyworks is a quad-channel, 4-input/0-output digital isolator with reinforced 5 kVRMS isolation, 150 Mbps data rate, <10 ns propagation delay, and fail-safe default-low output state. It operates across 2.5–5.5 V supplies and supports industrial and automotive systems requiring high-noise immunity and long-term reliability in harsh environments.
For engineers reviewing the SI8645BT-IS2 datasheet, SI8645BT-IS2 pinout, SI8645BT-IS2 application, or SI8645BT-IS2 equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases, and two confirmed alternative parts for isolation-critical designs in motor control, battery management, and isolated power conversion.
Technical Context
The SI8645BT-IS2 implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) versus optocouplers. Its architecture supports independent VDD1/VDD2 supplies (2.5–5.5 V), Schmitt-trigger inputs, and tri-state outputs controlled by internal enable logic.
All four channels reside on the VDD1 side (inputs A1–A4) and drive outputs B1–B4 on the VDD2 side. The -IS2 package provides 8 mm creepage in standard wide-body SOIC-16 footprint via tie-bar elimination, enabling reinforced insulation compliance per VDE 0884-10 and UL 1577 at 5 kVRMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed serial interfaces (e.g., SPI, RS-485 transceiver control, isolated ADC/DAC clocking). |
| Propagation Delay | 5.0–13 ns - enables precise timing in closed-loop motor control and fast-switching power supply feedback paths. |
| Channel-Channel Skew | ≤2.5 ns - ensures deterministic phase alignment across all four isolated signals for synchronized sampling or gate drive. |
| CMTI | ≥60 kV/µs - maintains signal integrity during high dv/dt events in inverters and traction systems. |
| Supply Range | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog subsystems without level shifters. |
| Isolation Rating | 5 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, supporting safety-critical medical and industrial equipment. |
| Fail-Safe Mode | Default-low output - guarantees known state during input-side power loss, critical for safe shutdown in BMS and OBC. |
Pinout & Package
SI8645BT-IS2 uses a 16-pin wide-body SOIC package (-IS2 variant) with 8 mm creepage, identical land pattern to standard WB SOIC-16 but with tie-bar removal for enhanced isolation. RoHS-compliant, peak reflow 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A1–A4 Inputs | Logic inputs on VDD1 side; Schmitt-triggered for >0.44 V hysteresis and noise rejection. |
| 5, 6, 7, 8 | B1–B4 Outputs | CMOS outputs on VDD2 side; tri-state capable via internal enable logic (no external EN pins on SI8645x). |
| 9, 10 | GND1, GND2 | Separate ground references for isolated sides; mandatory for maintaining galvanic separation. |
| 11, 12 | VDD1, VDD2 | Independent 2.5–5.5 V supplies; UVLO thresholds ensure clean startup/shutdown behavior. |
| 13–16 | N/C | No-connect pins; internally unconnected and may be left floating or tied to GND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year life at rated working voltage with stable timing over –40 to 125 °C. |
| Reinforced 5 kVRMS rating | Meets VDE 0884-10 and UL 1577 requirements for single-package reinforced insulation in medical (IEC 60601-1) and industrial (IEC 62368-1) systems. |
| Fail-safe default-low output | Guarantees B1–B4 = low when VDD1 is unpowered, enabling safe deactivation of downstream MOSFET gates or relay drivers. |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V - reduces thermal load in dense PCB layouts and extends battery life in portable test equipment. |
| Tri-state outputs | Supports bus sharing in multi-master isolated networks (e.g., isolated CAN or I²C expansion) without external bus switches. |
Applications
| Motor Control Systems | On-Board Chargers (OBC) |
|---|---|
|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback in 3-phase inverter stages. IC Role / Device Role / Timing Role: Quad-channel isolator transmitting high-frequency PWM edges (≤150 MHz) with ≤2.5 ns skew between phases. Use Value: Enables synchronous switching of IGBTs/MOSFETs while preventing ground-loop noise from corrupting current sensing. |
Use Scenario: Signal isolation between AC/DC front-end controller and DC/DC secondary-side regulation in EV charging units. IC Role / Device Role / Timing Role: Transmitting enable, fault, and status signals across 5 kVRMS barrier with fail-safe low default during primary-side brownout. Use Value: Ensures safe shutdown of secondary-side power stages when AC input fails, meeting ISO 17409 functional safety requirements. |
| Battery Management Systems (BMS) | Isolated Switch-Mode Power Supplies |
|
Use Scenario: Isolating cell-voltage monitoring IC communication and pack-level fault signaling in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Delivering isolated UART/SPI commands and SOC/SOH alerts across 5 kVRMS barrier with CMTI ≥60 kV/µs. Use Value: Prevents transient coupling from high-di/dt battery switching from disrupting precision analog measurements. |
Use Scenario: Providing feedback isolation for secondary-side error amplifiers in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Transmitting TL431 reference voltage error signals with <10 ns propagation delay and minimal pulse distortion. Use Value: Improves transient response and load regulation by eliminating optocoupler latency and gain variation. |
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 |
|---|---|---|---|
| ADUM2401ARWZ | 2.5 kVRMS basic isolation; 25 Mbps max data rate; no fail-safe mode; 16-pin SOIC wide body. | Limited to non-safety-critical industrial controls; insufficient for reinforced insulation requirements in medical or EV systems. | Select only if 5 kVRMS and >100 Mbps are not required; verify system-level certification compatibility. |
| ISO6741QDWR | 5 kVRMS reinforced; 50 Mbps max data rate; default-high output; 16-pin SOIC wide body. | Requires external pull-down for safe-low default; lower bandwidth restricts use in high-speed ADC interfaces or fast PWM. | Prefer when cost sensitivity outweighs speed needs and default-high behavior aligns with system logic. |
Compared with ADUM2401ARWZ and ISO6741QDWR, SI8645BT-IS2 uniquely combines 5 kVRMS reinforced isolation, 150 Mbps speed, and factory-configured fail-safe low output-enabling single-part compliance with IEC 62368-1, VDE 0884-10, and ISO 26262 ASIL-B signal path requirements without external components.
Availability
SI8645BT-IS2 is available at Aetrix Electronics and suitable for motor control, battery management systems, and isolated switch-mode power supplies requiring stable component supply, long-lifecycle support, and automotive-grade traceability.
Supply support for SI8645BT-IS2 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 industrial and automotive isolation-delivering RF-based digital isolation with reinforced safety ratings, ultra-low power, and guaranteed timing performance across –40 to 125 °C.
FAQ
What is the isolation rating and safety certification of SI8645BT-IS2?
SI8645BT-IS2 provides 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10 (reinforced), CSA 5A, and CQC GB4943.1. These certifications validate its suitability for medical (IEC 60601-1), industrial (IEC 62368-1), and automotive (ISO 17409) end-equipment requiring reinforced insulation barriers.
Does SI8645BT-IS2 require external bypass capacitors?
Yes, SI8645BT-IS2 requires a 0.1 µF ceramic bypass capacitor placed as close as possible between each VDD pin (VDD1 and VDD2) and its respective ground (GND1 and GND2). This is mandatory for stable operation and noise immunity-omitting these capacitors risks erratic behavior or increased EMI susceptibility.
What is the default output state of SI8645BT-IS2 during input-side power loss?
SI8645BT-IS2 is configured as a default-low device: when VDD1 is unpowered and VDD2 remains active, outputs B1–B4 assert logic low within 12 ns. This fail-safe behavior is factory-set and eliminates the need for external pull-down resistors in safety-critical shutdown paths.
Can SI8645BT-IS2 operate with different supply voltages on each side?
Yes, SI8645BT-IS2 supports independent VDD1 and VDD2 supplies ranging from 2.5 V to 5.5 V each. This allows direct interfacing between 3.3 V microcontrollers (VDD1 side) and 5 V analog circuitry (VDD2 side) without level-shifting components-reducing BOM count and layout complexity.
How does the -IS2 package differ from standard wide-body SOIC-16?
The -IS2 package retains the standard WB SOIC-16 footprint and land pattern but removes internal tie bars-increasing creepage distance to 8 mm while maintaining mechanical compatibility. This enables reinforced 5 kVRMS isolation without requiring PCB redesign or new assembly tooling.
SI8645BT-IS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-IS2 FAQ
1.How can I place an order for SI8645BT-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-IS2 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-IS2 reliable?
The price and inventory of SI8645BT-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-IS2 is usually 5 days.
3.What payment methods are accepted for SI8645BT-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-IS2?
SI8645BT-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-IS2 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-IS2?
For technical support, including SI8645BT-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-IS2 requirements.
6.How does Aetrix verify that SI8645BT-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8645BT-IS2 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-IS2 meets industry standards.
7.What is the process for return or replacement of SI8645BT-IS2?
All SI8645BT-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-IS2, 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-IS2 part is unused and in its original packaging.
Return procedure for SI8645BT-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-IS2 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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