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Skyworks Solutions Inc. SI8645BT-ASR
- Part No.:
- SI8645BT-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
SI8645BT-ASR from Skyworks is a quad-channel, 5 kVRMS reinforced-isolation digital isolator with 4-input/0-output channel configuration, 150 Mbps data rate, <10 ns propagation delay, and selectable default-low fail-safe output mode. It operates from 2.5–5.5 V on both sides and supports automotive-grade AEC-Q100 qualification for battery management and traction inverter signal isolation.
For engineers reviewing the SI8645BT-ASR datasheet, SI8645BT-ASR pinout, SI8645BT-ASR application, or SI8645BT-ASR equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, fail-safe behavior under power loss, and validated automotive-grade alternatives aligned with IEC 62368-1 and VDE 0884-10 reinforced insulation requirements.
Technical Context
The SI8645BT-ASR implements RF-based on/off keying across a silicon-die isolation barrier-eliminating startup initialization and enabling deterministic timing. Its four unidirectional channels (all inputs on VDD1 side, all outputs on VDD2 side) are controlled by no enable pins, as confirmed in Table 3.2 of the datasheet.
It features Schmitt-trigger inputs for >50 kV/µs common-mode transient immunity, 50 Ω nominal output impedance, and failsafe logic that drives outputs low when VDD1 is unpowered and VDD2 remains active-matching its "-B" ordering code for default-low behavior and "T" suffix for 5 kVRMS reinforced VDE 0884-10 certification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface without oversampling or clock recovery circuitry. |
| Propagation Delay | 5.0–13.0 ns - enables sub-20 ns round-trip latency in closed-loop motor control feedback paths. |
| Isolation Rating | 5000 VRMS for 1 minute - meets reinforced insulation per VDE 0884-10 and UL 1577, suitable for 800 V EV battery systems. |
| Supply Voltage | 2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Output | Default Low (B variant) - ensures safe deactivation of gate drivers or fault signals during input-side power loss. |
| Temperature Range | –40 °C to +125 °C - qualified for under-hood automotive use per AEC-Q100 Grade 1. |
| CMTI | Min. 35 kV/µs - maintains signal integrity in high-di/dt environments like SiC inverter switching nodes. |
Pinout & Package
SI8645BT-ASR uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16, -IS footprint), providing 8 mm creepage and reinforced insulation up to 5 kVRMS. Pin assignments follow standard Si864x layout with independent VDD1/GND1 (pins 1, 16) and VDD2/GND2 (pins 10, 9) supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | VDD1, GND1 | Input-side supply pair - powers channel input logic and RF transmitter; bypass capacitor required at pin 1. |
| 2–5 | INA1–INA4 | Unidirectional input channels - accept 2.0–5.5 V logic; Schmitt-triggered for noise rejection in noisy motor drive environments. |
| 9, 10 | GND2, VDD2 | Output-side supply pair - powers RF receiver and output drivers; decoupling required at pin 10. |
| 11–14 | OUTB1–OUTB4 | Isolated output channels - drive 50 Ω loads directly; default-low state asserted when VDD1 = 0 V and VDD2 active. |
| 6–8, 15 | NC | No-connect terminals - not internally bonded; may be left floating, tied to GND, or used for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; enables stable timing over –40 to +125 °C. |
| Reinforced VDE 0884-10 certification | Validated 10 kV surge capability and 60-year lifetime at rated working voltage - satisfies ISO 26262 ASIL-D system-level requirements. |
| Tri-state disable not supported | No EN pins present (per Si8645 row in Table 3.2); outputs always active when VDD2 is powered - simplifies control logic in safety-critical BMS monitoring. |
| Ultra-low power at 1 Mbps | 1.6 mA per channel at 5 V - reduces thermal load in densely packed automotive ECUs versus legacy isolators. |
| Automotive PPAP support | AIAG-compliant documentation, IMDS/CAMDS listings, and zero-defect manufacturing flow - accelerates OEM qualification. |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitor ICs (e.g., LTC6813) from MCU in 400–800 V battery packs. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting stacked-cell ADC data across high-voltage barrier with <13 ns delay. Use Value: Enables real-time SOC/SOH calculation without compromising functional safety due to guaranteed default-low output during cell-monitor power faults. | Use Scenario: Transmitting PWM gate-drive signals from controller to SiC MOSFET half-bridge drivers in EV inverters. IC Role / Device Role / Timing Role: High-speed, low-skew isolator delivering synchronized switching commands with ≤2.5 ns channel-to-channel skew. Use Value: Prevents shoot-through by maintaining precise timing alignment across all four gate-drive channels under 100+ kHz switching. |
| On-Board Charger (OBC) | Industrial PLC Analog I/O |
Use Scenario: Isolating AC line sensing and DC bus voltage feedback in bidirectional OBCs compliant with IEC 61851-23. IC Role / Device Role / Timing Role: Reinforced 5 kVRMS isolator interfacing isolated sigma-delta modulators (e.g., AMC1306) to DSP controllers. Use Value: Meets reinforced insulation requirements for secondary-side measurement while surviving 10 kV surge transients on primary side. | Use Scenario: Providing galvanic isolation between 24 V field-side analog input modules and 3.3 V backplane FPGA in modular PLCs. IC Role / Device Role / Timing Role: Quad-channel isolator handling multiple 16-bit ADC serial streams (SPI) with simultaneous sampling. Use Value: Eliminates ground loops and noise coupling in factory-floor environments with >35 kV/µs CMTI immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2402BRWZ | 4-channel, 25 kV/µs CMTI, 25 Mbps max rate, 2.5–5.5 V, SOIC-16 wide body, default-high output only | Lacks default-low fail-safe option; lower data rate limits use in high-speed BMS telemetry | Select when lower cost and legacy ADI ecosystem compatibility outweigh need for 150 Mbps or automotive qualification. |
| ISO7741FDWR | 4-channel, 100 Mbps, 80 kV/µs CMTI, 2.25–5.5 V, SOIC-16 wide body, default-low available | No AEC-Q100 qualification; VDE 0884-10 basic (not reinforced) insulation rating | Prefer for industrial automation where 100 Mbps suffices and automotive certification is unnecessary. |
Compared with ADUM2402BRWZ and ISO7741FDWR, SI8645BT-ASR uniquely combines 150 Mbps speed, AEC-Q100 Grade 1 operation, VDE-reinforced 5 kVRMS, and factory-configured default-low behavior-making it the only drop-in solution for next-gen EV battery monitoring requiring ASIL-B compliance and sub-10 ns timing.
Availability
SI8645BT-ASR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and industrial PLC analog I/O requiring stable component supply across automotive and industrial production lifecycles.
Supply support for SI8645BT-ASR 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 signal isolation in automotive electrification and industrial automation-emphasizing AEC-Q100 qualification, reinforced safety certification, and ultra-low power at multi-Mbps data rates.
FAQ
What is the isolation rating and safety certification status of SI8645BT-ASR?
SI8645BT-ASR provides 5000 VRMS reinforced isolation rated per UL 1577, CSA Component Notice 5A, IEC 62368-1, and VDE 0884-10. It is certified to reinforced VDE 0884-10 with 10 kV surge capability, meeting requirements for EV battery systems and medical equipment. SI8645BT-ASR carries AEC-Q100 Grade 1 qualification for automotive use.
Does SI8645BT-ASR support tri-state outputs or enable control?
No. SI8645BT-ASR has no enable inputs (EN1/EN2), as confirmed in Table 3.2 of the datasheet for Si8645 variants. Its four output channels are always active when VDD2 is powered. This eliminates external control complexity but means outputs cannot be placed in high-impedance state-SI8645BT-ASR is intended for fixed-direction, always-on isolation paths.
What is the default output state of SI8645BT-ASR during input-side power loss?
SI8645BT-ASR is a "-B" variant, meaning it defaults to logic low on all four outputs (OUTB1–OUTB4) when VDD1 is unpowered and VDD2 remains active. This fail-safe behavior is factory-set and critical for safe shutdown in BMS and inverter applications-SI8645BT-ASR asserts low signals to gate drivers or fault monitors during upstream power failure.
What package type and footprint does SI8645BT-ASR use?
SI8645BT-ASR uses a 16-pin wide-body SOIC package (-IS option) with 8 mm creepage distance, matching JEDEC MS-013AC. It is RoHS-compliant, reflow-compatible up to 260 °C, and pin-compatible with other Si864x WB SOIC variants. The "R" suffix denotes tape-and-reel packaging for automated assembly.
How does SI8645BT-ASR achieve its 150 Mbps data rate without jitter accumulation?
SI8645BT-ASR uses RF on/off keying instead of pulse-based encoding, delivering deterministic timing with only 350 ps peak eye diagram jitter and <4.5 ns pulse width distortion. Its 5–13 ns propagation delay range and ≤2.5 ns channel-to-channel skew ensure clean signal edges at full 150 Mbps-verified in Figure 2.3 of the datasheet. SI8645BT-ASR requires no external clock recovery or equalization.
SI8645BT-ASR 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):
- 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
SI8645BT-ASR FAQ
1.How can I place an order for SI8645BT-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-ASR 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-ASR reliable?
The price and inventory of SI8645BT-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-ASR is usually 5 days.
3.What payment methods are accepted for SI8645BT-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-ASR?
SI8645BT-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-ASR 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-ASR?
For technical support, including SI8645BT-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-ASR requirements.
6.How does Aetrix verify that SI8645BT-ASR is sourced from the original manufacturer or authorized distributors?
All SI8645BT-ASR 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-ASR meets industry standards.
7.What is the process for return or replacement of SI8645BT-ASR?
All SI8645BT-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-ASR, 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-ASR part is unused and in its original packaging.
Return procedure for SI8645BT-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-ASR 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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