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Skyworks Solutions Inc. SI8645BT-AS2
- Part No.:
- SI8645BT-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-AS2.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,502
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Product details
Overview
SI8645BT-AS2 from Skyworks is a quad-channel, automotive-grade digital isolator with reinforced 5 kVRMS isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and features selectable fail-safe default-low output mode. It is used in battery management systems and traction inverters where high-voltage galvanic separation and AEC-Q100 reliability are required.
For engineers reviewing the SI8645BT-AS2 datasheet, SI8645BT-AS2 pinout, SI8645BT-AS2 application, or SI8645BT-AS2 equivalent, key selection criteria include its 5 kVRMS reinforced VDE 0884-10 rating, tri-state enable control per channel group, Schmitt-trigger input noise immunity, and operation across –40 to 125 °C ambient temperature.
Technical Context
The SI8645BT-AS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture delivers precise timing (0.5 ns channel-channel skew, 2 ns propagation delay skew) and supports independent VDD1/VDD2 supplies (2.5–5.5 V).
All four channels reside on the same side (VDD1 = input side, VDD2 = output side), with no enable pins (EN1/EN2 not implemented). The device uses Schmitt-trigger inputs for >0.44 V hysteresis and exhibits 50 kV/µs common-mode transient immunity at 1500 VCM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation, certified to VDE 0884-10 and UL 1577 |
| Data Rate | DC to 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interfaces |
| Propagation Delay | 5–13 ns - enables tight-timing control loops in motor drives and power converters |
| Supply Voltage | 2.5–5.5 V per side - interoperable with 3.3 V and 5 V logic domains |
| Operating Temperature | –40 to 125 °C - qualified for under-hood automotive applications |
| Fail-Safe Mode | Default-low output during input-side power loss - prevents undefined states in BMS fault handling |
| Power Consumption | 1.6 mA/channel @ 1 Mbps, 5.5 mA/channel @ 100 Mbps @ 5 V - ultra-low active power |
Pinout & Package
SI8645BT-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (8 mm creepage, 10.3 mm body width) with reinforced insulation suitable for 5 kVRMS working voltage. Pin assignments follow standard Si864x channel mapping with dedicated VDD1/GND1 (pins 1–2, 15–16) and VDD2/GND2 (pins 9–10, 7–8) supply pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | VDD1, GND1 | Input-side power domain - powers channel transmitters and input buffers |
| 2–5 | A1–A4 | Unidirectional input signals - accept 2.5–5.5 V logic with Schmitt-trigger thresholds |
| 7, 8, 9, 10 | GND2, VDD2 | Output-side power domain - powers channel receivers and output drivers |
| 11–14 | B1–B4 | Isolated output signals - drive 50 Ω loads with 2.5–4.0 ns rise/fall times |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year lifetime at rated voltage |
| Selectably fail-safe output | Default-low state ensures safe shutdown of downstream MOSFET gates during input power loss |
| Tri-state capable outputs | Not applicable - SI8645BT-AS2 has no EN pins; all outputs always enabled |
| High CMTI immunity | ≥60 kV/µs (typical) - maintains signal integrity in noisy inverter switching environments |
| Automotive qualification | AEC-Q100 Grade 1 - full automotive process flow, PPAP support, IMDS/CAMDS compliance |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring and pack-level communication between high-voltage battery stack and MCU. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting analog front-end ADC results and status flags across 500–800 V potential difference. Use Value: Reinforced 5 kVRMS rating meets IEC 62368-1 and GB4943.1 requirements for EV battery safety; 125 °C operation supports under-pack placement. | Use Scenario: Transmitting PWM gate-drive signals from controller to isolated half-bridge drivers in 400 V/800 V inverters. IC Role / Device Role / Timing Role: High-speed, low-skew isolator delivering synchronized gate commands with <2.5 ns channel-channel skew. Use Value: 150 Mbps capability supports multi-MHz PWM modulation; 60 kV/µs CMTI prevents false triggering during dV/dt transients. |
| On-Board Charger (OBC) | Charging Station Interface |
Use Scenario: Isolating feedback signals (voltage/current sensing) and control commands between primary AC/DC stage and secondary DC/DC stage. IC Role / Device Role / Timing Role: Bidirectional-capable isolator (though SI8645BT-AS2 is unidirectional) - here used for primary-to-secondary command transmission only. Use Value: 5 kVRMS reinforced insulation satisfies reinforced insulation requirements for OBC functional safety; AEC-Q100 ensures long-term reliability in thermal cycling. | Use Scenario: Galvanically separating communication lines (e.g., ISO 15118, CAN) between EVSE controller and vehicle interface. IC Role / Device Role / Timing Role: Signal-level isolator for serial bus lines operating at up to 1 Mbps, ensuring ground-loop immunity and ESD robustness. Use Value: Schmitt-trigger inputs reject conducted noise on long cable runs; 2.5–5.5 V supply range simplifies integration with mixed-voltage host controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8645BB-AS | 2.5 kVRMS basic insulation (VDE 0884-10), same pinout and electrical specs except isolation rating | Suitable for non-reinforced industrial applications (e.g., PLC I/O modules) but not automotive high-voltage safety-critical use | Select SI8645BB-AS only when 5 kVRMS reinforcement is not mandated by system safety standard |
| ADUM4402ARWZ | 4-channel, 5 kVRMS, but uses iCoupler magnetic coupling; higher propagation delay (22 ns max); no AEC-Q100 qualification | Valid for industrial isolation where automotive qualification is unnecessary; requires different layout due to magnetic coupling sensitivity | Choose ADUM4402ARWZ if legacy Analog Devices ecosystem or magnetic-isolation preference exists, but verify AEC-Q100 compliance is not required |
Compared with SI8645BB-AS and ADUM4402ARWZ, SI8645BT-AS2 uniquely combines reinforced 5 kVRMS VDE 0884-10 certification, AEC-Q100 Grade 1 qualification, and sub-10 ns propagation delay - making it the only option qualified for safety-critical automotive traction and battery systems requiring both high speed and regulatory compliance.
Availability
SI8645BT-AS2 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply across automotive production lifecycles.
Supply support for SI8645BT-AS2 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 galvanic isolation in automotive and industrial power systems - emphasizing low power, precise timing, and safety-certified reinforced insulation.
FAQ
What is the isolation rating and safety certification of SI8645BT-AS2?
SI8645BT-AS2 provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation, making it suitable for automotive high-voltage safety-critical applications such as battery management and traction inverters.
Does SI8645BT-AS2 support tri-state outputs via enable pins?
No, SI8645BT-AS2 does not implement enable inputs (EN1/EN2). As confirmed in Table 3.2 of the datasheet, the Si8645 variant has "- / -" for EN1/EN2, meaning all four output channels (B1–B4) are always enabled. Tri-state functionality is unavailable on this part; output state is determined solely by input logic and fail-safe default setting.
What is the default output state of SI8645BT-AS2 during input-side power loss?
SI8645BT-AS2 is ordered with a default-low fail-safe mode (indicated by "BT" suffix). When VDD1 is unpowered but VDD2 remains active, outputs B1–B4 default to logic low within 12 ns (tSD), ensuring safe deactivation of downstream drivers in fault conditions - a critical feature for automotive BMS and inverter gate control.
Can SI8645BT-AS2 operate with mixed supply voltages (e.g., 3.3 V on VDD1 and 5 V on VDD2)?
Yes, SI8645BT-AS2 supports independent VDD1 and VDD2 supplies ranging from 2.5 V to 5.5 V each. This allows interfacing between 3.3 V microcontrollers and 5 V gate drivers or ADCs. Electrical specifications (propagation delay, current consumption, noise immunity) remain valid across the full voltage range per side, as verified in Tables 4.2 and 4.3 of the datasheet.
Is SI8645BT-AS2 pin-compatible with other Si864x variants in SOIC-16 wide-body packages?
Yes, SI8645BT-AS2 shares identical pinout and land pattern with all Si864x devices in the -AS (automotive wide-body SOIC-16) package, including SI8645BB-AS and SI8645BD-AS. This enables drop-in replacement for isolation rating or fail-safe mode changes - provided system-level safety validation accounts for differences in certification scope and surge capability.
SI8645BT-AS2 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:
- Magnetic 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-AS2 FAQ
1.How can I place an order for SI8645BT-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-AS2 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-AS2 reliable?
The price and inventory of SI8645BT-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-AS2 is usually 5 days.
3.What payment methods are accepted for SI8645BT-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-AS2?
SI8645BT-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-AS2 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-AS2?
For technical support, including SI8645BT-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-AS2 requirements.
6.How does Aetrix verify that SI8645BT-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8645BT-AS2 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-AS2 meets industry standards.
7.What is the process for return or replacement of SI8645BT-AS2?
All SI8645BT-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-AS2, 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-AS2 part is unused and in its original packaging.
Return procedure for SI8645BT-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-AS2 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.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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