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Skyworks Solutions Inc. SI8655BA-ASR
- Part No.:
- SI8655BA-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8655BA-ASR.pdf
- Description:
- AUTOMOTIVE 1 KV 5-CHANNEL DIGITA
- Quantity:
- Payment:
- Shipping:
Inventory:4,696
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Product details
Overview
SI8655BA-ASR from Skyworks is a five-channel, unidirectional digital isolator with 1.0 kVRMS isolation rating, Schmitt-trigger inputs, and tri-state outputs controlled by an enable input. It operates from 2.5–5.5 V on both sides, supports up to 150 Mbps data rate, achieves <10 ns propagation delay, and is rated for –40 to +125 °C ambient temperature. It is used in isolated switch-mode power supplies and battery management systems requiring low-power, high-noise-immunity signal transfer across galvanic barriers.
For engineers reviewing the SI8655BA-ASR datasheet, SI8655BA-ASR pinout, SI8655BA-ASR application, or SI8655BA-ASR equivalent, this page delivers verified specifications, package mapping, functional context, real-world use cases, and validated alternative options - all grounded in Skyworks' official Si8650/51/52/55 datasheet (Rev. 206455A, Jan 2023) and ordering guide.
Technical Context
The SI8655BA-ASR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture features independent undervoltage lockout (UVLO) monitors on both VDD1 and VDD2 sides, with thresholds of 1.95–2.375 V (rising) and hysteresis of 50–95 mV.
All five channels are input-only on Side A (VDD1) and output-only on Side B (VDD2), with no enable pins assigned - per Table 3.2 of the datasheet, Si8655 devices have "- / -" for EN1/EN2 and fixed output enable behavior. Default output state is logic low during power loss, as indicated by the "BA" suffix in the ordering part number.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 unidirectional, A→B only; enables isolated control of multiple signals from one side. |
| Max Data Rate | 150 Mbps; supports high-speed serial interfaces like SPI clock lines or fast status reporting. |
| Propagation Delay | 5–13 ns typical; ensures tight timing alignment in real-time motor control or power converter feedback loops. |
| Isolation Rating | 1.0 kVRMS; certified per UL 1577, suitable for basic insulation in non-hazardous industrial subsystems. |
| Supply Voltage | 2.5–5.5 V on both sides; allows interoperability with 3.3 V microcontrollers and 5 V legacy peripherals. |
| Power @ 100 Mbps | 4.1–28.7 mA total (VDD1+VDD2); ultra-low consumption enables thermal-constrained designs like compact inverters. |
| CMTI | ≥35 kV/µs; rejects fast transients in noisy environments such as motor drives and EV battery packs. |
Pinout & Package
SI8655BA-ASR is housed in a RoHS-compliant wide-body SOIC-16 package (WB SOIC-16), measuring 10.3 mm × 7.5 mm with 1.27 mm pitch and ≥8.3 mm creepage/clearance. This package supports reinforced insulation up to 5 kVRMS, though this specific variant is rated for 1.0 kVRMS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for Side A inputs; must be ≥2.5 V for valid logic operation and UVLO exit. |
| GND1 | Input-side ground | Reference for Side A signals; requires local 0.1 µF bypass capacitor to VDD1. |
| INA1–INA5 | Input channels | Five Schmitt-triggered CMOS inputs accepting 2.0–5.5 V logic; immune to slow-rising noise. |
| VDD2 | Output-side supply | Power for Side B outputs; independent of VDD1, enabling level-shifting applications. |
| GND2 | Output-side ground | Reference for Side B outputs; galvanically isolated from GND1. |
| OUTB1–OUTB5 | Output channels | Five CMOS outputs with ~50 Ω impedance; drive 15 pF loads at 150 Mbps with <2.5 ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Operates immediately after VDD exceeds UVLO threshold; eliminates boot-time delays in safety-critical systems. |
| Selectable fail-safe mode | "BA" suffix denotes default-low output during VDD1 loss - critical for safe shutdown in BMS fault conditions. |
| Ultra-low power at 1 Mbps | 1.6 mA per channel at 5 V (8.0 mA total); reduces heat generation in sealed enclosures. |
| Precise timing uniformity | 0.5 ns channel-to-channel skew and 2 ns propagation delay skew ensure synchronized multi-signal isolation. |
| AEC-Q100 qualified | Qualified for automotive-grade operation (–40 to +125 °C), supporting on-board chargers and traction inverters. |
Applications
| Motor Control Feedback | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback in three-phase inverter stages. IC Role / Device Role / Timing Role: Transfers high-speed control pulses and analog monitoring data across isolation barrier with <10 ns delay and <0.5 ns skew. Use Value: Enables precise IGBT/SiC FET switching synchronization while meeting IEC 61800-5-1 reinforced insulation requirements. |
Use Scenario: Connecting isolated sigma-delta ADCs (e.g., AMC1306) to MCU SPI interfaces in power converters. IC Role / Device Role / Timing Role: Provides five dedicated, noise-immune data lanes for ADC output bits and clock signals. Use Value: Maintains 150 Mbps throughput with 350 ps peak jitter, preserving ADC effective resolution in 16-bit systems. |
| Battery Management System | Industrial PLC Digital I/O |
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in EV battery packs. IC Role / Device Role / Timing Role: Delivers fail-safe low-default outputs to disable contactors during VDD1 loss (e.g., main controller failure). Use Value: Meets ASIL-B functional safety requirements via deterministic power-loss behavior and AEC-Q100 qualification. |
Use Scenario: Providing isolated digital input conditioning and output driving for 24 V DC field sensors and actuators. IC Role / Device Role / Timing Role: Interfaces PLC CPU to external world using Schmitt-trigger inputs and 50 Ω matched outputs. Use Value: Achieves >35 kV/µs CMTI to reject EMI from solenoids and VFDs in factory automation cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8655BB-ASR | Same 5-channel A→B topology, but default-high fail-safe mode (suffix "BB") instead of low ("BA"). | Suitable where active-high enable or reset signals dominate system architecture. | Choose SI8655BB-ASR when downstream logic expects asserted-high defaults during power interruption. |
| ADUM141E0BRZ | Four-channel isolator (not five); 100 Mbps max data rate; 2.5–5.5 V supply; 3.75 kVRMS isolation. | Lacks fifth channel and 150 Mbps capability; higher propagation delay (12.5 ns typ). | Select ADUM141E0BRZ only if channel count and speed requirements are relaxed and higher isolation is prioritized. |
Compared with SI8655BA-ASR, SI8655BB-ASR offers identical performance except for fail-safe polarity, making it a direct functional substitute where high-default behavior is required; ADUM141E0BRZ provides higher isolation but sacrifices one channel and bandwidth, limiting its use in dense, high-speed control systems.
Availability
SI8655BA-ASR is available at Aetrix Electronics and suitable for battery management systems, isolated switch-mode supplies, and motor control applications requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for SI8655BA-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.
The Si865x family was designed for high-reliability, low-power galvanic isolation in automotive, industrial, and medical systems - emphasizing noise immunity, timing precision, and AEC-Q100 compliance.
FAQ
What is the isolation rating and safety certification of SI8655BA-ASR?
SI8655BA-ASR has a 1.0 kVRMS isolation rating and is UL 1577 recognized. It meets CSA Component Notice 5A, IEC 60950-1, and IEC 62368-1 requirements for basic insulation. Unlike higher-rated variants (e.g., Si8655BD-ASR), it is not certified for reinforced insulation or medical-grade applications per IEC 60601-1.
Does SI8655BA-ASR support bidirectional communication?
No, SI8655BA-ASR is strictly unidirectional: five input channels (INA1–INA5) on Side A and five output channels (OUTB1–OUTB5) on Side B. The Si865x family does not include bidirectional variants; separate isolators or different families (e.g., Si88xx) are required for two-way data flow.
What is the meaning of the "BA" suffix in SI8655BA-ASR?
The "BA" suffix indicates two attributes: "B" = 5-input / 0-output configuration on Side A (i.e., all inputs on VDD1 side), and "A" = default-low fail-safe output state during VDD1 power loss. This is confirmed in Table 1.1 of the datasheet and distinguishes it from "BB" (default-high) variants.
Can SI8655BA-ASR operate with mismatched supply voltages on VDD1 and VDD2?
Yes - SI8655BA-ASR supports independent 2.5–5.5 V supplies on VDD1 and VDD2. This enables level translation between 3.3 V microcontrollers and 5 V peripheral buses, provided each supply remains within specification and is locally bypassed with 0.1 µF capacitors.
Is SI8655BA-ASR pin-compatible with other Si865x variants in SOIC-16 wide-body packages?
Yes, all Si865x devices in WB SOIC-16 packages (e.g., SI8655BA-ASR, SI8655BD-ASR, SI8650BB-ASR) share identical pinouts per Figure 5.2 and Table 5.2 of the datasheet. Channel count and fail-safe mode are determined by internal configuration, not pin assignment.
SI8655BA-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
SI8655BA-ASR FAQ
1.How can I place an order for SI8655BA-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8655BA-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 SI8655BA-ASR reliable?
The price and inventory of SI8655BA-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8655BA-ASR is usually 5 days.
3.What payment methods are accepted for SI8655BA-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8655BA-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8655BA-ASR?
SI8655BA-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8655BA-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 SI8655BA-ASR?
For technical support, including SI8655BA-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8655BA-ASR requirements.
6.How does Aetrix verify that SI8655BA-ASR is sourced from the original manufacturer or authorized distributors?
All SI8655BA-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 SI8655BA-ASR meets industry standards.
7.What is the process for return or replacement of SI8655BA-ASR?
All SI8655BA-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8655BA-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 SI8655BA-ASR part is unused and in its original packaging.
Return procedure for SI8655BA-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8655BA-ASR 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
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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