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Skyworks Solutions Inc. SI8640BT-ASR
- Part No.:
- SI8640BT-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8640BT-ASR.pdf
- Description:
- AUTOMOTIVE 10 KV SURGE, 5 KV ISO
- Quantity:
- Payment:
- Shipping:
Inventory:3,654
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Product details
Overview
SI8640BT-ASR 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, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs with single enable control (EN), and selectable fail-safe low default output state - used in battery management systems and isolated ADC interfaces where high CMTI and low-power signal integrity are critical.
For engineers reviewing the SI8640BT-ASR datasheet, SI8640BT-ASR pinout, SI8640BT-ASR application, or SI8640BT-ASR equivalent, this page delivers verified specifications, package mapping, functional context, and real-world use cases - all aligned to the official Si864x datasheet Rev. 206329A and Skyworks' automotive-grade ordering guide.
Technical Context
The SI8640BT-ASR implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling deterministic timing without clock recovery circuitry. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ), ensuring robust power sequencing in automotive BMS and traction inverter gate drivers.
All four channels reside on the input side (VDD1), driving outputs on the isolated side (VDD2); EN is located on VDD2 and controls all four outputs simultaneously. The device uses internal 10 µA pull-downs on inputs/outputs to enforce low-fail-safe behavior during power loss - a factory-configured feature confirmed for SI8640BT-ASR in Table 1.1 and Section 3.4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5.0 kVRMS reinforced (VDE 0884-10 certified, 10 kV surge capable) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, CAN FD, and isolated ADC sampling clocks |
| Propagation Delay | 8.0 ns (typ) - enables sub-10 ns timing-critical feedback loops in motor control |
| Channel-Channel Skew | 0.5 ns (typ) - ensures synchronous sampling across multiple isolated sensor channels |
| CMTI | 100 kV/µs (min) - maintains signal integrity in high-di/dt environments like inverters |
| Supply Voltage Range | 2.5–5.5 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 MOSFET gates |
Pinout & Package
SI8640BT-ASR is housed in a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16, -AS suffix), with 8 mm creepage and reinforced insulation. Pin assignments follow Skyworks' standard Si864x layout for 4-input/0-output configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic and RF transmitter; must be bypassed with 0.1 µF capacitor |
| GND1 | Input-side ground | Reference for all input signals and VDD1; requires low-inductance connection |
| IN1–IN4 | Digital input channels | CMOS/Schmitt-trigger inputs accepting 2.5–5.5 V logic; no external bias required |
| VDD2 | Output-side supply | Power for RF receiver and output drivers; independent of VDD1 for true galvanic isolation |
| GND2 | Output-side ground | Isolated reference for outputs; must be separated from GND1 by ≥8 mm creepage |
| OUT1–OUT4 | Isolated digital outputs | Push-pull outputs with ~50 Ω impedance; support 4 mA sink/source at 0.4 V VOL |
| EN | Output enable control | Active-high signal on VDD2 side; drives all four outputs to high-impedance when low |
| NC | No-connect | Pins 1, 9, 16 - internally unconnected; may be left floating or tied to GND/VDD2 |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated 5.0 kVRMS working voltage and 10 kV surge immunity for safety-critical EV systems |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V - reduces thermal load in densely packed BMS modules |
| Tri-state output control via single EN pin | Enables shared bus architectures and eliminates need for external multiplexers |
| Fail-safe low default output | Guaranteed logic-low state on OUTx during VDD1 brownout - prevents unsafe actuation |
| 60-year lifetime at rated voltage | Validated reliability for automotive applications exceeding 15-year vehicle service life |
Applications
| Battery Management System (BMS) | Isolated Analog-to-Digital Interface |
|---|---|
|
Use Scenario: Monitoring cell voltages and temperatures in 400–800 V EV battery packs using isolated sigma-delta ADCs. IC Role / Device Role / Timing Role: Transfers ADC serial clock and data across isolation barrier while maintaining <0.5 ns channel skew for synchronized sampling. Use Value: Enables precise SOC estimation via simultaneous multi-cell measurement, supported by 100 kV/µs CMTI and fail-safe low outputs preventing false fault triggers. |
Use Scenario: Isolating SPI communication between MCU and isolated precision ADC (e.g., AD7403) in medical imaging power supplies. IC Role / Device Role / Timing Role: Carries 150 Mbps SPI SCLK and DOUT with sub-10 ns propagation delay to preserve timing margins. Use Value: Eliminates ground loop noise without degrading SNR; 5.0 kVRMS rating meets IEC 60601-1 reinforced insulation requirements. |
| Traction Inverter Gate Driver Interface | On-Board Charger (OBC) Control Isolation |
|
Use Scenario: Transmitting PWM signals from controller to isolated gate drivers in 120 kW EV inverters with >10 kA di/dt transients. IC Role / Device Role / Timing Role: Delivers fast, skew-controlled gate enable/disable commands with 8 ns typical propagation delay. Use Value: Prevents shoot-through via deterministic timing; 100 kV/µs CMTI suppresses common-mode noise induced by SiC switching. |
Use Scenario: Isolating control signals between low-voltage MCU and high-voltage DC-DC stage in 11 kW OBCs. IC Role / Device Role / Timing Role: Transfers enable, fault, and status signals across 5.0 kVRMS barrier with AEC-Q100 qualification. Use Value: Meets automotive functional safety requirements (ISO 26262 ASIL-B) through certified reinforced insulation and 125 °C operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8640BB-ASR | Same 4-input/0-output topology and WB SOIC-16 package, but rated for 2.5 kVRMS basic isolation (VDE 0884-10, not reinforced) | Lacks 10 kV surge capability and IEC 62368-1/60601-1 compliance - unsuitable for medical or EV traction systems | Select SI8640BB-ASR only for industrial PLC I/O where 2.5 kVRMS suffices and cost sensitivity outweighs safety certification needs. |
| ADUM140D0BRWZ | 4-channel, 150 Mbps, 3.75 kVRMS (reinforced), but uses iCoupler magnetic coupling and lacks integrated fail-safe pull-downs | Requires external bias resistors for fail-safe behavior; lower CMTI (75 kV/µs) limits use in high-di/dt inverters | Choose ADUM140D0BRWZ when legacy iCoupler compatibility is required and system-level pull-downs can be added externally. |
Compared with SI8640BB-ASR and ADUM140D0BRWZ, SI8640BT-ASR uniquely combines 5.0 kVRMS reinforced certification, factory-configured low-fail-safe outputs, and 100 kV/µs CMTI - making it the only option qualified for ASIL-B traction inverter control and IEC 60601-1 medical isolation without design compromises.
Availability
SI8640BT-ASR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and isolated ADC interfaces requiring stable component supply across automotive and industrial production lifecycles.
Supply support for SI8640BT-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 for high-reliability applications.
The SI864x family was designed specifically for automotive and industrial isolation needs - delivering reinforced safety certification, AEC-Q100 qualification, and ultra-low power consumption in harsh thermal and EMI environments.
FAQ
What is the isolation rating and safety certification status of SI8640BT-ASR?
SI8640BT-ASR is certified for 5.0 kVRMS reinforced isolation per VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1, with 10 kV surge capability. It meets IEC 62368-1 and IEC 60601-1 requirements for reinforced insulation - validated for use in automotive BMS and medical power supplies where dual protection is mandated.
Does SI8640BT-ASR require external pull-up or pull-down resistors for fail-safe operation?
No. SI8640BT-ASR integrates 10 µA internal pull-downs on all inputs and outputs to enforce a guaranteed low state during VDD1 loss - a factory-configured feature confirmed in the Si864x datasheet Table 3.1 and Ordering Guide. External resistors are unnecessary and not recommended.
What is the function of the EN pin on SI8640BT-ASR, and how is it implemented?
The EN pin on SI8640BT-ASR is an active-high enable input located on the VDD2 (output) side. When driven low, it places all four outputs (OUT1–OUT4) into high-impedance state - enabling shared-bus architectures and safe power sequencing. Its timing is characterized: enable-to-data valid is 6.0 ns (typ), and enable-to-tri-state is 8.0 ns (typ).
How does SI8640BT-ASR achieve its 100 kV/µs common-mode transient immunity?
SI8640BT-ASR achieves 100 kV/µs CMTI through its RF-based modulation architecture and optimized die layout - rejecting fast common-mode edges without requiring external filtering. This performance is measured per Figure 4.3 in the datasheet with VCM = 1500 V and VI = 0 V or VDD, and is intrinsic to the Si864x process, not dependent on PCB layout.
Is SI8640BT-ASR qualified for automotive applications, and what evidence supports this?
Yes. SI8640BT-ASR carries the "-A" suffix per Skyworks' ordering nomenclature, confirming full AEC-Q100 qualification, AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and zero-defect manufacturing flow. Its top marking contains first-character "N–Z", verifying automotive-grade traceability per datasheet Note 7.
SI8640BT-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
SI8640BT-ASR FAQ
1.How can I place an order for SI8640BT-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640BT-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 SI8640BT-ASR reliable?
The price and inventory of SI8640BT-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640BT-ASR is usually 5 days.
3.What payment methods are accepted for SI8640BT-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640BT-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640BT-ASR?
SI8640BT-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640BT-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 SI8640BT-ASR?
For technical support, including SI8640BT-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640BT-ASR requirements.
6.How does Aetrix verify that SI8640BT-ASR is sourced from the original manufacturer or authorized distributors?
All SI8640BT-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 SI8640BT-ASR meets industry standards.
7.What is the process for return or replacement of SI8640BT-ASR?
All SI8640BT-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8640BT-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 SI8640BT-ASR part is unused and in its original packaging.
Return procedure for SI8640BT-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640BT-ASR Tags
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