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Skyworks Solutions Inc. SI8645BD-B-ISR
- Part No.:
- SI8645BD-B-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BD-B-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
SI8645BD-B-ISR from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, rated for 5.0 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves ≤13 ns propagation delay, consumes 3.6 mA per side at 1 Mbps (5 V), and features Schmitt-trigger inputs, tri-state outputs via EN control, and selectable fail-safe low-default output state.
For engineers reviewing the SI8645BD-B-ISR datasheet, SI8645BD-B-ISR pinout, SI8645BD-B-ISR application, or SI8645BD-B-ISR equivalent, this device is selected for high-reliability industrial power conversion, motor drive feedback loops, and isolated ADC/DAC interfaces where 5 kVRMS working voltage, <10 ns timing skew, and AEC-Q100-compatible robustness are required.
Technical Context
The SI8645BD-B-ISR implements RF-based on/off keying across a silicon-dielectric isolation barrier, eliminating startup initialization and enabling deterministic channel behavior without clock recovery circuitry. Its architecture delivers inherent noise immunity via Schmitt-trigger inputs and supports independent undervoltage lockout (UVLO) on both VDD1 and VDD2 sides.
All four channels are unidirectional from Side A (VDD1) to Side B (VDD2); no enable pins are present (per Table 3.2), so outputs B1–B4 are always enabled and follow inputs A1–A4. The device operates across –40°C to +125°C with stable timing and sub-2.5 ns channel-to-channel skew under full temperature and voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS reinforced (VDE 0884-10, UL 1577, CSA 5A, CQC GB4943.1) |
| Max Data Rate | 150 Mbps - supports high-speed serial links like SPI, RS-485 transceiver control, and isolated gate driver feedback |
| Propagation Delay | 5.0–13 ns - enables tight-timing control loops in motor inverters and SMPS feedback paths |
| Channel-Channel Skew | ≤2.5 ns - ensures synchronized sampling across multiple isolated sensor or ADC channels |
| Supply Voltage Range | 2.375–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Fail-Safe Default | Low output during VDD1 loss - prevents unintended activation of downstream MOSFETs or relays |
| Common-Mode Transient Immunity | ≥60 kV/µs - maintains signal integrity in high-dv/dt environments like IGBT switching nodes |
Pinout & Package
SI8645BD-B-ISR uses a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16, -IS suffix), 10.3 mm body width, 8 mm creepage, JEDEC MS-013AC compliant, peak reflow 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | VDD1 Power Supply | Input-side supply (2.375–5.5 V); requires local 0.1 µF bypass capacitor |
| 5, 7, 9, 11 | A1–A4 Inputs | Unidirectional logic inputs with Schmitt-trigger thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) |
| 6, 8, 10, 12 | B1–B4 Outputs | CMOS outputs (VOH ≥ VDD2–0.4 V, VOL ≤ 0.4 V @ 4 mA); 50 Ω nominal impedance |
| 13, 14 | GND1 | Input-side ground reference; must be separated from GND2 by isolation barrier |
| 15, 16 | GND2 | Output-side ground reference; galvanically isolated from GND1 |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced 5.0 kVRMS Isolation | Meets VDE 0884-10, UL 1577, and IEC 62368-1 for safety-critical industrial and EV charging systems |
| Ultra-Low Power at High Speed | 3.6 mA per side at 1 Mbps / 5 V; 17.5 mA per side at 100 Mbps - reduces thermal load in dense PCB layouts |
| No Startup Initialization | Outputs transition to valid logic states within 40 µs of VDD application - eliminates boot-time uncertainty in real-time control |
| High CMTI Performance | ≥60 kV/µs common-mode transient immunity - sustains operation during fast-switching power stage transients |
| Fail-Safe Low Default | Guaranteed logic-low output when VDD1 is unpowered - prevents hazardous activation in fault conditions |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Gate driving and current sensing feedback in 3-phase inverter stages for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Isolates PWM signals from MCU to gate drivers and returns isolated current-sense ADC data across high-voltage barriers. Use Value: Enables precise 150 Mbps SPI communication between isolated ADCs and controllers while maintaining 5 kVRMS working voltage and <2.5 ns channel skew for synchronized sampling. |
Use Scenario: Secondary-side voltage/current monitoring and primary-side controller feedback in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Transfers isolated analog monitor data (via isolated sigma-delta modulators) and fault signals across 800 VDC bus barriers. Use Value: Provides 60 kV/µs CMTI immunity to reject noise from high-frequency transformer ringing and switching node transients. |
| Medical Isolated Data Acquisition | Battery Management Systems (BMS) |
Use Scenario: Patient-connected ECG/EEG front-end isolation in diagnostic imaging and bedside monitors. IC Role / Device Role / Timing Role: Digitally isolates 24-bit isolated ADC outputs while preserving signal integrity and meeting IEC 60601-1 reinforced insulation requirements. Use Value: Delivers certified 5.0 kVRMS reinforced isolation and <13 ns propagation delay to support real-time waveform reconstruction without latency-induced artifacts. |
Use Scenario: Cell voltage and temperature monitoring in high-voltage traction battery packs (up to 1000 VDC). IC Role / Device Role / Timing Role: Isolates daisy-chained ADC data and cell balancing commands between stacked battery monitor ICs and central MCU. Use Value: Supports AEC-Q100-compliant operation at 125 °C ambient and guarantees fail-safe low default to disable balancing FETs during primary-side power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM240D0BRIZ | 4-channel, 5 kVRMS, 150 Mbps, but uses iCoupler® capacitive technology; higher typical supply current (4.2 mA @ 1 Mbps, 5 V) | Same industrial isolation use cases, but lacks AEC-Q100 qualification and VDE 0884-10 reinforced certification | Choose ADUM240D0BRIZ only if legacy Analog Devices design ecosystem or specific capacitive-noise profile is required |
| ISO6741FDWR | 4-channel, 5 kVRMS, 50 Mbps max data rate; CMOS-based, lower power (1.8 mA @ 1 Mbps), but not AEC-Q100 qualified | Suitable for cost-sensitive industrial PLC I/O modules where 150 Mbps is unnecessary | Select ISO6741FDWR when bandwidth demand is ≤50 Mbps and automotive qualification is not required |
Compared with ADUM240D0BRIZ and ISO6741FDWR, SI8645BD-B-ISR uniquely combines 150 Mbps speed, AEC-Q100 qualification, VDE 0884-10 reinforced certification, and fail-safe low default in a single wide-body SOIC-16 package-making it optimal for next-generation EV chargers and high-reliability industrial inverters.
Availability
SI8645BD-B-ISR is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply monitoring, and battery management systems requiring stable component supply, long-term lifecycle support, and certified 5 kVRMS reinforced isolation.
Supply support for SI8645BD-B-ISR 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, medical, and automotive isolation applications demanding reinforced safety certification, ultra-low power at high data rates, and guaranteed fail-safe behavior across extended temperature ranges.
FAQ
What is the isolation rating and safety certification status of SI8645BD-B-ISR?
SI8645BD-B-ISR is rated for 5.0 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 62368-1, IEC 60601-1, and CQC GB4943.1. These certifications validate its suitability for safety-critical applications including medical equipment and EV charging infrastructure where double/reinforced insulation is mandated.
Does SI8645BD-B-ISR support bidirectional communication?
No, SI8645BD-B-ISR is a unidirectional isolator with all four channels configured from VDD1 side (A1–A4 inputs) to VDD2 side (B1–B4 outputs). It does not support reverse-direction signaling. For bidirectional use, designers must pair it with a complementary isolator or select a different Si864x variant such as SI8642BD-B-IS.
What is the default output state of SI8645BD-B-ISR during input-side power loss?
SI8645BD-B-ISR has a factory-configured fail-safe mode that drives all outputs (B1–B4) low when VDD1 is unpowered and VDD2 remains active. This behavior is fixed by ordering code "BD" and prevents unintended activation of downstream loads such as gate drivers or relays during brownout or startup faults.
Can SI8645BD-B-ISR operate across the full –40°C to +125°C temperature range?
Yes, SI8645BD-B-ISR is fully specified and tested over –40°C to +125°C ambient temperature. Electrical parameters-including propagation delay (5–13 ns), channel skew (≤2.5 ns), and supply current-are guaranteed across this range, making it suitable for under-hood automotive and industrial environments without derating.
What package type and footprint does SI8645BD-B-ISR use?
SI8645BD-B-ISR uses a wide-body SOIC-16 package (-IS suffix), with 10.3 mm body width, 8 mm creepage distance, and JEDEC MS-013AC outline. It requires standard WB SOIC-16 land pattern (per Skyworks document #206329A, Section 7) and supports 260 °C peak reflow per JEDEC J-STD-020.
SI8645BD-B-ISR 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:
- No
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- 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
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8645BD-B-ISR FAQ
1.How can I place an order for SI8645BD-B-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BD-B-ISR 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 SI8645BD-B-ISR reliable?
The price and inventory of SI8645BD-B-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BD-B-ISR is usually 5 days.
3.What payment methods are accepted for SI8645BD-B-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BD-B-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BD-B-ISR?
SI8645BD-B-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BD-B-ISR 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 SI8645BD-B-ISR?
For technical support, including SI8645BD-B-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BD-B-ISR requirements.
6.How does Aetrix verify that SI8645BD-B-ISR is sourced from the original manufacturer or authorized distributors?
All SI8645BD-B-ISR 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 SI8645BD-B-ISR meets industry standards.
7.What is the process for return or replacement of SI8645BD-B-ISR?
All SI8645BD-B-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BD-B-ISR, 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 SI8645BD-B-ISR part is unused and in its original packaging.
Return procedure for SI8645BD-B-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BD-B-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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