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Skyworks Solutions Inc. SI8655BA-AU
- Part No.:
- SI8655BA-AU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8655BA-AU.pdf
- Description:
- AUTOMOTIVE 1 KV 5-CHANNEL DIGITA
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
SI8655BA-AU from Skyworks is a five-channel, unidirectional digital isolator with 1.0 kVRMS isolation rating, Schmitt-trigger inputs, and fail-safe low-default output state. It operates from 2.5–5.5 V on both sides, supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and targets automotive battery management and on-board charger interfaces.
For engineers reviewing the SI8655BA-AU datasheet, SI8655BA-AU pinout, SI8655BA-AU application, or SI8655BA-AU equivalent, this page delivers verified electrical specs, QSOP-16 package details, AEC-Q100 qualification status, fail-safe behavior under power loss, and real-world timing performance including 0.5 ns channel-channel skew and 50 kV/µs CMTI.
Technical Context
The SI8655BA-AU implements RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required. All five channels transmit from VDD1-side inputs (A1–A5) to VDD2-side outputs (B1–B5), with no enable pins (EN1/EN2 omitted per Si8655 family definition).
It features selectable fail-safe mode (low-default in this variant), undervoltage lockout on both sides (UVLO+ = 2.24 V typ), and stable operation from –40 °C to +125 °C. Input thresholds (VT+ = 1.67 V typ, VT– = 1.23 V typ) provide 0.44 V hysteresis for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 unidirectional, input-to-output only (A1–A5 → B1–B5) |
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and isolated ADC interface clocking |
| Propagation Delay | 8.0 ns typ - enables tight timing closure in motor control gate driver feedback loops |
| Channel-Channel Skew | 0.5 ns max - ensures synchronized sampling across multi-channel isolated sensors |
| Isolation Rating | 1.0 kVRMS - certified per UL 1577, suitable for functional isolation in low-voltage subsystems |
| Supply Voltage | 2.5–5.5 V on both sides - interoperable with 3.3 V microcontrollers and 5 V analog front-ends |
| CMTI | 50 kV/µs min - maintains signal integrity during fast-switching events in inverters and SMPS |
Pinout & Package
SI8655BA-AU is housed in a RoHS-compliant QSOP-16 package (5.3 mm × 10.2 mm, 1.0 mm height), optimized for space-constrained automotive modules and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies internal transmitter circuitry; bypass with 0.1 µF capacitor near pin |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by creepage/clearance barrier |
| A1–A5 | Input signals (side 1) | Schmitt-triggered, 1.23–1.67 V thresholds; tolerate slow edges and noise |
| VDD2 | Output-side power supply | Supplies internal receiver and output drivers; independent of VDD1 |
| GND2 | Output-side ground reference | Isolated return for VDD2; defines secondary-side logic domain |
| B1–B5 | Output signals (side 2) | 50 Ω nominal output impedance; drive 15 pF loads at 150 Mbps with <4 ns rise/fall |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe low-default output | When VDD1 is unpowered but VDD2 is active, all B1–B5 outputs default to logic low - prevents undefined states in BMS fault detection |
| Ultra-low power at 1 Mbps | 1.5 mA per channel at 2.5 V - extends runtime in always-on automotive monitoring circuits |
| No start-up initialization | Outputs follow inputs within 40 µs of VDD stabilization - eliminates boot-time delays in safety-critical systems |
| High CMTI immunity | 50 kV/µs minimum - suppresses transient-induced glitches during IGBT switching in traction inverters |
| AEC-Q100 Grade 1 | Qualified from –40 °C to +125 °C ambient - meets automotive powertrain and charging system reliability requirements |
Applications
| Battery Management System (BMS) | On-Board Charger (OBC) Control |
|---|---|
Use Scenario: Isolating cell voltage monitor ICs and pack current sensors from MCU in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Five-channel unidirectional isolator transmitting analog monitor data and fault flags across 400–800 V DC barriers. Use Value: 1.0 kVRMS rating matches functional isolation needs; low-default fail-safe prevents false trip signals during partial power loss. |
Use Scenario: Coupling MCU PWM and status signals between low-voltage control board and high-side gate drivers in AC/DC PFC stage. IC Role / Device Role / Timing Role: Transmitting isolated enable, fault, and synchronization signals with sub-10 ns delay to maintain phase alignment. Use Value: 150 Mbps capability supports high-frequency digital control loops; 0.5 ns channel skew preserves timing integrity across multi-phase drivers. |
| Industrial PLC I/O Module | Medical Isolated Data Acquisition |
Use Scenario: Providing galvanic isolation for digital input cards receiving 24 V DC field signals in factory automation cabinets. IC Role / Device Role / Timing Role: Converting noisy industrial field signals into clean, noise-immune logic levels for FPGA or ARM processor inputs. Use Value: Schmitt-trigger inputs reject >1.2 V noise spikes; 50 kV/µs CMTI withstands EMI from nearby VFDs and solenoids. |
Use Scenario: Isolating patient-connected sensor front-ends (ECG, EEG) from USB/Bluetooth host processors in portable diagnostic devices. IC Role / Device Role / Timing Role: Safely transferring digitized biopotential waveforms while meeting IEC 60601-1 reinforced insulation requirements. Use Value: QSOP-16 footprint minimizes board area; AEC-Q100 qualification correlates with long-term reliability needed in clinical settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8655BB-AU | Same 5-channel QSOP-16 package and AEC-Q100 rating, but 2.5 kVRMS isolation instead of 1.0 kVRMS | Required where higher working voltage margin is mandated (e.g., OBC primary-secondary barrier) | Select SI8655BB-AU when system-level safety certification demands >1.0 kVRMS isolation; otherwise SI8655BA-AU reduces cost and layout complexity. |
| ADUM141D1BRZ | 4-channel, SOIC-16, 3.75 kVRMS, 150 Mbps, but no fail-safe low-default option - defaults high | Suitable for non-fail-safe digital interfaces (e.g., isolated UART), not BMS fault signaling | Choose ADUM141D1BRZ only if channel count and package compatibility outweigh the lack of configurable fail-safe state. |
Compared with SI8655BB-AU, SI8655BA-AU offers lower isolation rating for cost-sensitive functional isolation; compared with ADUM141D1BRZ, it provides automotive qualification, 5-channel density, and guaranteed low-default behavior critical for safety monitoring.
Availability
SI8655BA-AU is available at Aetrix Electronics and suitable for automotive battery management systems, on-board chargers, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 compliance, and functional isolation up to 1.0 kVRMS.
Supply support for SI8655BA-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 SI865x family was designed specifically for automotive and industrial applications demanding high reliability, low power, and robust noise immunity - targeting BMS, OBC, and motor control subsystems.
FAQ
What is the isolation rating and safety certification status of the SI8655BA-AU?
The SI8655BA-AU is rated for 1.0 kVRMS isolation and certified to UL 1577 (recognized component), CSA Component Notice 5A, and VDE 0884-10. It meets IEC 62368-1 and IEC 60950-1 requirements for functional insulation. These certifications apply directly to the SI8655BA-AU part number as shipped in QSOP-16 packaging.
Does the SI8655BA-AU support fail-safe operation, and what is its default output state?
Yes, the SI8655BA-AU implements a selectable fail-safe mode. As indicated by the "BA" suffix in the ordering part number, it defaults to logic low on all five outputs (B1–B5) when VDD1 is unpowered but VDD2 remains active - a critical feature for safe shutdown in battery management fault conditions.
What package type and pin count does the SI8655BA-AU use?
The SI8655BA-AU uses a 16-pin QSOP (Quarter-Shrink Small Outline Package) with 0.635 mm pitch, measuring 5.3 mm × 10.2 mm. This package is RoHS-compliant, JEDEC-reflow compatible (260 °C peak), and optimized for high-density automotive PCB layouts.
How does the SI8655BA-AU handle power supply sequencing between VDD1 and VDD2?
The SI8655BA-AU operates correctly regardless of VDD1/VDD2 sequencing order. If VDD1 powers up before VDD2, outputs remain undetermined until VDD2 stabilizes. If VDD2 powers first, outputs enter high-impedance state until VDD1 is applied - behavior confirmed in Table 3.1 of the SI8650/51/52/55 datasheet for SI8655 variants.
Is the SI8655BA-AU qualified for automotive applications, and what grade does it meet?
Yes, the SI8655BA-AU carries the "-AU" suffix denoting Automotive Grade qualification. It is fully AEC-Q100 Grade 1 qualified (–40 °C to +125 °C ambient), manufactured using automotive-specific process flows, and supported with AIAG-compliant PPAP documentation and IMDS/CAMDS material reporting.
SI8655BA-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 5/0
- 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:
- 2.5V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
SI8655BA-AU FAQ
1.How can I place an order for SI8655BA-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8655BA-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 SI8655BA-AU reliable?
The price and inventory of SI8655BA-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8655BA-AU is usually 5 days.
3.What payment methods are accepted for SI8655BA-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8655BA-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8655BA-AU?
SI8655BA-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8655BA-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 SI8655BA-AU?
For technical support, including SI8655BA-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8655BA-AU requirements.
6.How does Aetrix verify that SI8655BA-AU is sourced from the original manufacturer or authorized distributors?
All SI8655BA-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 SI8655BA-AU meets industry standards.
7.What is the process for return or replacement of SI8655BA-AU?
All SI8655BA-AU units undergo pre-shipment inspection (PSI). If there is an issue with SI8655BA-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 SI8655BA-AU part is unused and in its original packaging.
Return procedure for SI8655BA-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8655BA-AU 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
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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