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Skyworks Solutions Inc. SI8645BT-AS2R
- Part No.:
- SI8645BT-AS2R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-AS2R.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,306
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Product details
Overview
SI8645BT-AS2R from Skyworks is a quad-channel, 5 kVRMS reinforced digital isolator in wide-body SOIC-16 package, supporting up to 150 Mbps data rate with <10 ns propagation delay, 0.5 ns channel-channel skew, and fail-safe low-default output state. It operates from 2.5–5.5 V on both sides and delivers ultra-low power consumption (5.5 mA/channel at 100 Mbps, 5 V), targeting isolated communication in battery management systems and traction inverters.
For engineers reviewing the SI8645BT-AS2R datasheet, SI8645BT-AS2R pinout, SI8645BT-AS2R application, or SI8645BT-AS2R equivalent, key selection criteria include its AEC-Q100 qualified automotive-grade construction, VDE 0884-10 reinforced insulation certification, 10 kV surge capability, and tri-state enable control for output multiplexing in high-noise motor drive environments.
Technical Context
The SI8645BT-AS2R implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing superior noise immunity over optocouplers. Its architecture supports independent undervoltage lockout (UVLO) on both VDD1 and VDD2 sides, with 2.24 V rising threshold and 70 mV hysteresis.
All four channels are unidirectional input-to-output (4:0 configuration), with Schmitt-trigger inputs (1.23–1.67 V thresholds), 50 Ω nominal output impedance, and no enable pins-confirmed by Table 3.2 where Si8645 has "- / -" for EN1/EN2. Default output is logic low during power loss per ordering option "BT".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | DC to 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface timing |
| Propagation delay | 5–13 ns - enables sub-10 ns timing-critical feedback loops in motor control |
| Channel skew | ≤2.5 ns (P-P), ≤0.5 ns (typ.) - ensures synchronized sampling across multiple isolated sensors |
| Isolation rating | 5000 VRMS, reinforced per VDE 0884-10 - meets IEC 62368-1 and 60601-1 for medical and EV systems |
| Supply voltage | 2.5–5.5 V on both sides - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| Power @ 100 Mbps | 5.5 mA/channel at 5 V - reduces thermal load in densely packed automotive ECUs |
| CMTI | ≥60 kV/µs - sustains reliable operation during fast-switching SiC/GaN inverter transients |
Pinout & Package
SI8645BT-AS2R uses a 16-pin wide-body SOIC package (8 mm creepage, -AS2 suffix), RoHS-compliant, with standard JEDEC land pattern and 260 °C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channels A1–A4 input circuitry; bypass with 0.1 µF capacitor |
| GND1 | Input-side ground | Reference return for all input-side signals and VDD1 decoupling |
| A1–A4 | Input terminals | CMOS/Schmitt-trigger inputs accepting 2.0–5.5 V logic; no external pull-ups needed |
| VDD2 | Output-side supply | Power for B1–B4 output drivers; independent of VDD1 for level-shifting |
| GND2 | Output-side ground | Isolated reference for output signals; must be separated from GND1 by creepage barrier |
| B1–B4 | Output terminals | 50 Ω driver outputs; default low during VDD1 power loss; no enable control |
| NC | No-connect | Pins 1, 9, 10, 16 are unused; may be left floating or tied to GND/VDD2 per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 + 10 kV surge | Enables single-package isolation for 800 V EV battery monitoring without external TVS |
| AEC-Q100 Grade 1 qualification | Validated for –40 to 125 °C ambient operation in on-board chargers and BMS modules |
| Fail-safe low-default output | Guarantees safe shutdown state when primary controller loses power in traction inverter gate drives |
| RF modulation architecture | Eliminates start-up delay and DC drift issues common in capacitive isolators |
| 60 kV/µs CMTI | Prevents data corruption during 100 V/ns switching transients in SiC half-bridges |
Applications
| Motor Control Systems | On-Board Chargers (OBC) |
|---|---|
Use Scenario: Isolating PWM signals from MCU to gate drivers in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting four independent PWM channels with <0.5 ns skew. Use Value: Enables precise synchronous switching of high-side and low-side IGBTs/SiC FETs while maintaining functional safety integrity. | Use Scenario: Signal isolation between AC/DC controller and DC/DC stage in bidirectional OBCs. IC Role / Device Role / Timing Role: Isolating feedback signals (voltage, current, temperature) and control commands across 5 kV barrier. Use Value: Meets reinforced insulation requirements for 1000 V AC input systems without additional creepage extenders. |
| Battery Management Systems (BMS) | Traction Inverters |
Use Scenario: Isolating cell voltage measurement data from high-voltage battery pack to MCU in EV platforms. IC Role / Device Role / Timing Role: Transmitting precision analog monitor signals via isolated SPI or I²C bus using low-skew timing. Use Value: Maintains ±0.5% measurement accuracy under 60 kV/µs common-mode noise from adjacent high-power modules. | Use Scenario: Providing isolated gate drive enable/disable signals and fault reporting in dual-motor traction inverters. IC Role / Device Role / Timing Role: Fail-safe low-default output ensures gate drivers disable safely during MCU brownout. Use Value: Eliminates need for external pull-down resistors and reduces BOM count in ASIL-D critical paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2400ARWZ | 4-channel, 25 kV/µs CMTI, 25 Mbps max, 2.7–5.5 V, SOIC-16 NB | Limited to industrial temp (–40 to 105 °C); lacks AEC-Q100 and VDE 0884-10 reinforced rating | Acceptable for non-automotive 25 Mbps SPI isolation where cost is prioritized over surge immunity |
| ISO7741FDWR | 4-channel, 100 Mbps, 80 kV/µs CMTI, 2.25–5.5 V, SOIC-16 WB, VDE-reinforced | Not AEC-Q100 qualified; default output not configurable; higher quiescent current at 100 Mbps | Suitable for industrial inverters needing higher CMTI but no automotive qualification |
Compared with ADUM2400ARWZ and ISO7741FDWR, SI8645BT-AS2R uniquely combines AEC-Q100 Grade 1, VDE 0884-10 reinforced certification, 10 kV surge capability, and fail-safe low-default output-making it the only drop-in solution for ASIL-B compliant traction inverter signal isolation requiring 150 Mbps bandwidth.
Availability
SI8645BT-AS2R is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverters requiring stable component supply, long-term automotive lifecycle support, and certified reinforced isolation.
Supply support for SI8645BT-AS2R 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 is engineered for high-reliability automotive and industrial isolation, delivering robust RF-based digital isolation with reinforced safety certification and extended temperature operation.
FAQ
What is the isolation rating and safety certification of SI8645BT-AS2R?
SI8645BT-AS2R provides 5000 VRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and 60601-1 for end-equipment compliance in automotive and medical applications. The "T" in SI8645BT-AS2R denotes VDE 0884-10 reinforced rating with 10 kV surge capability.
Does SI8645BT-AS2R support enable functionality for output control?
No, SI8645BT-AS2R does not include enable inputs. As confirmed in Table 3.2 of the datasheet, the Si8645 variant has "- / -" for EN1 and EN2, meaning all four outputs (B1–B4) are always active when powered. Output tri-state control is not supported-unlike Si8640/41/42 variants which feature dedicated EN pins.
What is the default output state of SI8645BT-AS2R during input-side power loss?
SI8645BT-AS2R has a fail-safe low-default output state, as indicated by the "BT" ordering code (B = low default, T = VDE 0884-10 reinforced). When VDD1 is unpowered but VDD2 remains active, outputs B1–B4 drive logic low within 12 ns (tSD), ensuring safe shutdown in gate drive and BMS monitoring circuits.
What package type and creepage distance does SI8645BT-AS2R use?
SI8645BT-AS2R uses a wide-body SOIC-16 package with "-AS2" suffix, featuring 8 mm creepage distance achieved via tie-bar elimination while retaining standard SOIC-16 land pattern. This meets reinforced insulation requirements for 800 V battery systems and eliminates need for custom PCB spacing.
Is SI8645BT-AS2R qualified for automotive applications?
Yes, SI8645BT-AS2R is AEC-Q100 Grade 1 qualified (–40 to 125 °C), manufactured using full automotive process flows, and supported with AIAG-compliant PPAP documentation, IMDS, and CAMDS listings. The "-A" in the suffix "-AS2R" confirms its automotive-grade status, with top marking containing an N–Z manufacturing code prefix.
SI8645BT-AS2R 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:
- 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-AS2R FAQ
1.How can I place an order for SI8645BT-AS2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-AS2R 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-AS2R reliable?
The price and inventory of SI8645BT-AS2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-AS2R is usually 5 days.
3.What payment methods are accepted for SI8645BT-AS2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-AS2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-AS2R?
SI8645BT-AS2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-AS2R 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-AS2R?
For technical support, including SI8645BT-AS2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-AS2R requirements.
6.How does Aetrix verify that SI8645BT-AS2R is sourced from the original manufacturer or authorized distributors?
All SI8645BT-AS2R 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-AS2R meets industry standards.
7.What is the process for return or replacement of SI8645BT-AS2R?
All SI8645BT-AS2R units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-AS2R, 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-AS2R part is unused and in its original packaging.
Return procedure for SI8645BT-AS2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-AS2R 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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