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Skyworks Solutions Inc. SI8640BA-AU
- Part No.:
- SI8640BA-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8640BA-AU.pdf
- Description:
- AUTOMOTIVE 1 KV 4 FORWARD CHANNE
- Quantity:
- Payment:
- Shipping:
Inventory:2,993
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Product details
Overview
SI8640BA-AU from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 1 kV RMS isolation rating, and selectable default-low fail-safe output mode. It operates from 2.5–5.5 V, supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and is AEC-Q100 qualified for automotive applications including battery management systems and on-board chargers.
For engineers reviewing the SI8640BA-AU datasheet, SI8640BA-AU pinout, SI8640BA-AU application, or SI8640BA-AU equivalent, this page delivers verified specifications, QSOP-16 package details, fail-safe logic behavior, and automotive-grade timing performance - critical for high-reliability isolated signal transmission in EV powertrain and charging subsystems.
Technical Context
The SI8640BA-AU implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its four isolated channels are all input-side referenced (VDD1), with outputs on VDD2 side driven only by input state - no bidirectional or mixed-direction capability.
It features Schmitt-trigger inputs for >0.4 V hysteresis, 50 Ω nominal output impedance, and dual undervoltage lockout (UVLO) monitors - one per supply rail - ensuring deterministic behavior during asymmetric power sequencing. The fail-safe mode is fixed at default-low per ordering option, not software-configurable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1.0 kV RMS - certified to UL 1577, CSA 5A, and IEC 60950-1 basic insulation; suitable for functional isolation in 24–48 V automotive subsystems. |
| Data Rate | DC to 150 Mbps - enables real-time CAN FD, SPI, or PWM feedback loop isolation without bandwidth bottleneck. |
| Propagation Delay | 5.0–13.0 ns - ensures sub-20 ns round-trip latency for closed-loop motor control timing budgets. |
| Supply Voltage Range | 2.5–5.5 V - interoperable with 3.3 V microcontrollers and 5 V legacy interfaces without level-shifting. |
| Channel Configuration | 4-input / 0-output - all four channels transmit from VDD1 side to VDD2 side; no reverse-direction signals supported. |
| Fail-Safe Output State | Default Low - outputs drive low when VDD1 is unpowered but VDD2 remains active, preventing undefined states in BMS fault conditions. |
| Common-Mode Transient Immunity | 35–100 kV/µs - maintains signal integrity during fast-switching events in traction inverter gate-drive circuits. |
Pinout & Package
SI8640BA-AU is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm pitch and standard JEDEC land pattern. This narrow-body surface-mount package supports automated assembly and provides 4.1 mm creepage/clearance - sufficient for 1 kV RMS working voltage in compact automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input buffers and RF transmitter; must be stable before valid input sampling. |
| GND1 | Input-side ground reference | Return path for VDD1; requires dedicated low-impedance plane separation from GND2 to maintain isolation integrity. |
| INA1–INA4 | Input signal terminals | Accept 2.0–5.5 V logic; Schmitt-trigger inputs tolerate slow edges and reject >0.4 V noise spikes. |
| VDD2 | Output-side power supply | Supplies output drivers; independent of VDD1 - enables galvanic separation between domains. |
| GND2 | Output-side ground reference | Return path for VDD2; physically isolated from GND1; defines output logic threshold (VDD2-dependent). |
| OUTB1–OUTB4 | Isolated output terminals | Drive CMOS loads with 50 Ω impedance; default-low state asserted when VDD1 = 0 V and VDD2 active. |
| EN | Enable control input | Active-high enable on VDD2 side; drives outputs to high-impedance when low - supports dynamic channel gating. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and temperature drift issues of optocouplers; guarantees 60-year life at rated voltage with no calibration. |
| Tri-state outputs with EN pin | Single-pin control disables all four outputs into high-impedance - simplifies bus arbitration and reduces standby current. |
| Automotive-grade qualification | AEC-Q100 Grade 1 (–40 to +125 °C) with AIAG-compliant PPAP documentation and IMDS/CAMDS material reporting. |
| Precision timing performance | 0.5 ns typical channel-to-channel skew and 2 ns propagation delay skew - preserves phase alignment across multi-channel feedback paths. |
| Low-power operation at 100 Mbps | 5.5 mA per channel at 5 V - reduces thermal load in densely packed power electronics control boards. |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) Control |
|---|---|
Use Scenario: Isolating cell voltage monitoring ADC serial interface from MCU domain in high-voltage battery packs. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting 4-channel ADC conversion results across 400–800 V potential barrier. Use Value: Default-low fail-safe prevents floating logic states during partial power loss, avoiding false overvoltage alarms during pack disconnect. |
Use Scenario: Transmitting PWM enable signals and status flags from OBC controller to isolated gate drivers in AC/DC and DC/DC stages. IC Role / Device Role / Timing Role: Providing four synchronized, low-latency control paths with <13 ns max propagation delay for interleaved switching. Use Value: 150 Mbps capability supports high-frequency digital control loops; 35–100 kV/µs CMTI suppresses noise from SiC MOSFET switching transients. |
| Traction Inverter Interface | EV Charging Station Communication |
Use Scenario: Isolating fault reporting lines (overtemperature, overcurrent, desaturation) from IGBT/SiC driver ICs to main inverter controller. IC Role / Device Role / Timing Role: Fail-safe default-low output ensures "no fault" condition is asserted until valid data arrives - critical for safe torque disable. Use Value: AEC-Q100 qualification and –40 to +125 °C operation guarantee reliability under under-hood thermal cycling. |
Use Scenario: Isolating CAN FD communication lines between charging station controller and vehicle's battery ECU. IC Role / Device Role / Timing Role: Supporting 2–5 Mbps CAN FD data rates with deterministic latency and no bit errors under EMI stress. Use Value: Schmitt-trigger inputs and 0.4 V hysteresis reject conducted noise on long cable runs; QSOP-16 footprint minimizes PCB area in compact wall-box designs. |
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-AU | 2.5 kV RMS isolation rating; identical pinout, timing, and fail-safe behavior. | Required where reinforced insulation is mandated for higher working voltages (e.g., 400 V DC bus monitoring). | Select SI8640BB-AU when system-level safety certification demands ≥2.5 kV RMS isolation barrier. |
| ISO6740QDWR | Texas Instruments part; 5000 VRMS VDE-reinforced rating; SOIC-16 wide-body; 50 Mbps max data rate. | Lower speed but higher isolation; suited for non-timing-critical diagnostics and status reporting. | Choose ISO6740QDWR only if 150 Mbps is unnecessary and VDE-reinforced certification is required for end-equipment approval. |
Compared with SI8640BA-AU, SI8640BB-AU offers higher isolation without trade-offs in speed or footprint, while ISO6740QDWR sacrifices bandwidth for VDE-reinforced compliance - making SI8640BA-AU optimal for cost-sensitive, high-speed automotive signal isolation where 1 kV suffices.
Availability
SI8640BA-AU is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and traction inverter interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SI8640BA-AU 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 engineered specifically for automotive and industrial isolation needs - delivering ultra-low-power, high-speed, and AEC-Q100-qualified digital isolation in compact packages like QSOP-16.
FAQ
What is the isolation voltage rating of SI8640BA-AU and which safety standards does it meet?
The SI8640BA-AU has a 1.0 kV RMS isolation rating and is certified to UL 1577, CSA Component Notice 5A, and IEC 60950-1 basic insulation standards. It meets AEC-Q100 Grade 1 requirements for automotive use and supports functional isolation in 48 V and 400 V subsystems. SI8640BA-AU does not carry VDE 0884-10 reinforced certification - that applies only to Si864xxT variants or higher-kV versions like SI8640BB-AU.
Does SI8640BA-AU support bidirectional data transmission?
No, SI8640BA-AU is strictly unidirectional: all four channels transmit from the VDD1 side (INA1–INA4) to the VDD2 side (OUTB1–OUTB4). It lacks reverse-direction channels or configurable I/O pins. For bidirectional isolation, engineers must select other Si864x variants such as SI8641BA-AU (3-input/1-output) or SI8642BA-AU (2-input/2-output), not SI8640BA-AU.
What is the function of the EN pin on SI8640BA-AU and how is it used?
The EN pin on SI8640BA-AU is an active-high enable input located on the VDD2 side. When pulled high, it enables all four outputs to follow their respective inputs; when pulled low, it places OUTB1–OUTB4 into high-impedance state. This allows dynamic channel disabling without changing input signals. SI8640BA-AU does not have EN2 - only one enable pin, consistent with its 4-input/0-output topology.
How does the fail-safe default-low behavior of SI8640BA-AU operate during power loss?
When VDD1 is unpowered (0 V) but VDD2 remains active, SI8640BA-AU drives all four outputs (OUTB1–OUTB4) low - this is factory-set and non-configurable. The transition occurs within 12 ns (tSD) after VDD1 collapse. This behavior prevents undefined logic states in safety-critical automotive functions like BMS fault signaling, where "low" explicitly means "no fault." SI8640BA-AU does not support default-high configuration - that requires part numbers ending in "E", e.g., SI8640EA-AU.
What package type and footprint does SI8640BA-AU use, and is it compatible with automated assembly?
SI8640BA-AU uses a QSOP-16 package (5.3 mm × 10.2 mm, 0.635 mm pitch) with RoHS-compliant matte tin lead finish and JEDEC-standard land pattern. It is fully compatible with standard SMT pick-and-place equipment and reflow profiles (peak 260 °C). The narrow-body form factor saves board space versus SOIC-16 alternatives, and its 4.1 mm creepage meets IPC-2221B requirements for 1 kV RMS working voltage in automotive PCB layouts.
SI8640BA-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SSOP (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:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 1000Vrms
- 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-QSOP
SI8640BA-AU FAQ
1.How can I place an order for SI8640BA-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640BA-AU 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 SI8640BA-AU reliable?
The price and inventory of SI8640BA-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640BA-AU is usually 5 days.
3.What payment methods are accepted for SI8640BA-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640BA-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640BA-AU?
SI8640BA-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640BA-AU 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 SI8640BA-AU?
For technical support, including SI8640BA-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640BA-AU requirements.
6.How does Aetrix verify that SI8640BA-AU is sourced from the original manufacturer or authorized distributors?
All SI8640BA-AU 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 SI8640BA-AU meets industry standards.
7.What is the process for return or replacement of SI8640BA-AU?
All SI8640BA-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8640BA-AU, 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 SI8640BA-AU part is unused and in its original packaging.
Return procedure for SI8640BA-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640BA-AU 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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