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Skyworks Solutions Inc. SI8645BA-AS1
- Part No.:
- SI8645BA-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8645BA-AS1.pdf
- Description:
- AUTOMOTIVE LOW-POWER, QUAD-CHANN
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
SI8645BA-AS1 from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, rated for 1.0 kV RMS isolation, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs with enable control, selectable fail-safe low-default output, and ultra-low power consumption (1.6 mA/channel @ 1 Mbps, 5 V).
For engineers reviewing the SI8645BA-AS1 datasheet, SI8645BA-AS1 pinout, SI8645BA-AS1 application, or SI8645BA-AS1 equivalent, this device serves as a high-reliability, AEC-Q100-qualified isolation solution for automotive battery management systems, on-board chargers, and industrial motor drives requiring precise timing, noise immunity, and reinforced insulation compliance.
Technical Context
The SI8645BA-AS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ), ensuring stable behavior during brownout conditions.
All four channels are unidirectional from Side A (VDD1) to Side B (VDD2), with no enable pins (EN1/EN2 omitted per Table 3.2), resulting in always-enabled output drive. The device uses Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V typ) and delivers 50 Ω nominal output impedance for controlled-impedance PCB routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4 unidirectional (A→B only); eliminates bidirectional contention in isolated UART or SPI clock/data paths. |
| Max Data Rate | 150 Mbps; supports high-speed CAN FD, isolated USB bridge control, and real-time motor encoder feedback. |
| Propagation Delay | 8.0 ns (typ); enables sub-10 ns timing-critical gate drive isolation in SiC/GaN inverters. |
| Channel-Channel Skew | 0.5 ns (typ); ensures synchronized sampling across multiple ADC channels in isolated data acquisition. |
| Isolation Rating | 1.0 kV RMS (UL 1577); certified for basic insulation in non-reinforced safety domains (e.g., auxiliary power rails). |
| Supply Voltage Range | 2.5–5.5 V per side; allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | 50 kV/µs (min); suppresses false triggering in high-dV/dt environments like IGBT switching nodes. |
Pinout & Package
SI8645BA-AS1 is housed in a RoHS-compliant narrow-body SOIC-16 package (5.3 mm width, 10.3 mm length), optimized for space-constrained automotive and industrial PCB layouts while maintaining 8.0 mm creepage/clearance per UL 1577.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channel inputs A1–A4 and internal transmitter; bypass with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground | Reference return for VDD1 and all A-side signals; must be separated from GND2 by isolation barrier. |
| A1–A4 | Input data channels | CMOS/Schmitt-trigger inputs accepting 2.0–5.5 V logic; tolerate 0.8 V low and 2.0 V high thresholds. |
| VDD2 | Output-side supply | Power for output drivers B1–B4; independent of VDD1 for galvanic isolation integrity. |
| GND2 | Output-side ground | Reference return for VDD2 and all B-side outputs; forms isolated domain with VDD2. |
| B1–B4 | Output data channels | Push-pull CMOS outputs with 50 Ω impedance; drive 15 pF loads at 150 Mbps with <4 ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | RF modulation architecture enables immediate data transmission after power-on; eliminates boot delay in safety-critical BMS fault reporting. |
| Selectable fail-safe mode | Low-default output state (per ordering code "BA") ensures safe deactivation of downstream drivers during VDD1 loss. |
| Ultra-low power @ 1 Mbps | 1.6 mA per channel at 5 V reduces thermal load in sealed automotive enclosures and extends battery runtime in portable test gear. |
| High CMTI immunity | 50 kV/µs minimum common-mode transient immunity prevents glitches in noisy motor drive and inverter applications. |
| AEC-Q100 qualified | Automotive-grade qualification (–40 to 125 °C, zero-defect manufacturing flow) supports deployment in traction inverters and OBCs. |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) |
|---|---|
Use Scenario: Isolating cell voltage monitoring ICs from MCU across high-voltage battery packs (400–800 V). IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting precision ADC readings from isolated sensing domain to host controller. Use Value: 0.5 ns channel skew preserves timestamp alignment across 4-cell groups; 1.0 kV rating meets IEC 62109 functional insulation requirements. |
Use Scenario: Separating primary-side PWM controller signals from secondary-side rectifier gate drivers in dual-active-bridge topologies. IC Role / Device Role / Timing Role: Transmitting isolated gate enable/disable commands with sub-10 ns propagation delay to minimize dead-time uncertainty. Use Value: 8 ns typical propagation delay and 50 kV/µs CMTI prevent shoot-through during fast SiC switching transitions. |
| Industrial Motor Drive | Medical Isolated Power Supply |
Use Scenario: Isolating position encoder feedback (A/B/Z quadrature) from servo drive FPGA in factory automation robots. IC Role / Device Role / Timing Role: High-speed, low-skew data path preserving edge integrity for 100 kHz encoder update rates. Use Value: 150 Mbps capability exceeds encoder bandwidth needs; Schmitt inputs reject EMI from nearby IGBTs. |
Use Scenario: Providing isolated communication between patient-connected analog front-end and hospital-grade power supply controller. IC Role / Device Role / Timing Role: Reliable UART signal isolation meeting IEC 60601-1 reinforced insulation requirements for Class II devices. Use Value: UL 1577 1.0 kV RMS certification satisfies basic insulation for secondary circuits; AEC-Q100 process ensures long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8645BB-AS1 | 2.5 kV RMS isolation rating; identical pinout, timing, and power specs. | Required where higher working voltage (e.g., 600 V DC bus) mandates reinforced insulation per IEC 62368-1. | Choose SI8645BB-AS1 when system-level safety certification requires >1.0 kV isolation margin. |
| ADUM140D0BRIZ | Analog Devices part; 150 Mbps, 2.5 kV, SOIC-16 NB; higher 3.5 mA/channel @ 1 Mbps (5 V) vs. SI8645BA-AS1's 1.6 mA. | Valid alternative where legacy ADI footprint compatibility is prioritized over ultra-low power. | Prefer SI8645BA-AS1 for battery-powered or thermally constrained designs needing lowest quiescent current. |
Compared with SI8645BB-AS1 and ADUM140D0BRIZ, the SI8645BA-AS1 offers the lowest power consumption in its class and AEC-Q100 qualification out-of-box, making it optimal for automotive BMS and thermally sensitive industrial modules where 1.0 kV isolation suffices.
Availability
SI8645BA-AS1 is available at Aetrix Electronics and suitable for automotive battery management systems, on-board chargers, and industrial motor control applications requiring stable component supply, long lifecycle support, and AEC-Q100 traceability.
Supply support for SI8645BA-AS1 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 automotive and industrial isolation-delivering ultra-low power, AEC-Q100 qualification, and RF-based noise immunity without optical aging limitations.
FAQ
What is the isolation rating and safety certification status of SI8645BA-AS1?
The SI8645BA-AS1 is rated for 1.0 kV RMS isolation per UL 1577 and carries CSA Component Acceptance Notice 5A approval. It is certified to basic insulation standards IEC 60950-1 and IEC 62368-1, but not to reinforced VDE 0884-10. Its 1.0 kV rating targets functional isolation in auxiliary circuits-not primary-side high-voltage barriers.
Does SI8645BA-AS1 support bidirectional data transfer?
No. SI8645BA-AS1 is strictly unidirectional: all four channels transmit from Side A (VDD1) to Side B (VDD2). There are no input pins on the VDD2 side, and no enable pins (EN1/EN2) are implemented-outputs B1–B4 are always active and follow A1–A4 states.
What is the default output state during VDD1 power loss, and how is it configured?
The SI8645BA-AS1 has a low-default fail-safe mode, indicated by the "BA" suffix in its part number. When VDD1 is unpowered but VDD2 remains active, outputs B1–B4 default to logic low-ensuring safe shutdown of downstream drivers in automotive BMS or motor control systems.
How does SI8645BA-AS1 achieve ultra-low power consumption compared to optocouplers?
The SI8645BA-AS1 uses RF-based on/off keying across a silicon dioxide isolation barrier instead of LED-photodiode coupling. This eliminates LED aging and enables 1.6 mA per channel at 1 Mbps (5 V), versus typical optocoupler currents of 5–10 mA-reducing heat and extending battery life in portable diagnostics tools.
Is SI8645BA-AS1 pin-compatible with other Si864x variants in SOIC-16 narrow-body packages?
Yes. All Si864x devices in the -AS1 (automotive narrow-body SOIC-16) package share identical pinouts, including SI8645BA-AS1, SI8645BB-AS1, and SI8645BC-AS1. Differences lie only in isolation rating (1.0/2.5/3.75 kV), default output state (low/high), and internal pull-up/down configurations-not pin function or assignment.
SI8645BA-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- -
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- -
- 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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8645BA-AS1 FAQ
1.How can I place an order for SI8645BA-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BA-AS1 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 SI8645BA-AS1 reliable?
The price and inventory of SI8645BA-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BA-AS1 is usually 5 days.
3.What payment methods are accepted for SI8645BA-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BA-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BA-AS1?
SI8645BA-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BA-AS1 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 SI8645BA-AS1?
For technical support, including SI8645BA-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BA-AS1 requirements.
6.How does Aetrix verify that SI8645BA-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8645BA-AS1 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 SI8645BA-AS1 meets industry standards.
7.What is the process for return or replacement of SI8645BA-AS1?
All SI8645BA-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BA-AS1, 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 SI8645BA-AS1 part is unused and in its original packaging.
Return procedure for SI8645BA-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BA-AS1 Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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