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Skyworks Solutions Inc. SI8655BA-B-IS1
- Part No.:
- SI8655BA-B-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8655BA-B-IS1.pdf
- Description:
- LOW POWER FIVE-CHANNEL DIGITAL I
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
SI8655BA-B-IS1 from Skyworks is a five-channel, unidirectional digital isolator with 1.0 kVRMS isolation rating, Schmitt-trigger inputs, tri-state outputs with enable control, 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 is qualified for industrial applications across –40 to +125 °C ambient temperature.
For engineers reviewing the SI8655BA-B-IS1 datasheet, SI8655BA-B-IS1 pinout, SI8655BA-B-IS1 application, or SI8655BA-B-IS1 equivalent, this page delivers verified electrical specs, package mapping to narrow-body SOIC-16, functional pin definitions, real-world use cases in isolated power and motor control, and two validated alternative part numbers with documented technical and application differences.
Technical Context
The SI8655BA-B-IS1 implements RF-based on/off keying across a semiconductor isolation barrier-no startup initialization required. Its architecture provides robust noise immunity (50 kV/µs CMTI), stable timing over temperature (±0.5 ns channel skew), and dual-supply operation with independent undervoltage lockout on each side (VDDUV+ = 2.24 V typ).
All five channels are input-only on VDD1 side and output-only on VDD2 side (5:0 configuration), with a single EN2 pin controlling all five outputs. The device features selectable fail-safe mode (low default) and requires only 0.1 µF bypass capacitors per supply-no external components needed for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 unidirectional channels (VDD1 → VDD2 only) |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and isolated ADC/DAC clocking |
| Propagation Delay | 8.0 ns typical - enables tight timing budgets in real-time motor control and power converter feedback loops |
| Isolation Rating | 1.0 kVRMS - meets basic insulation requirements for non-hazardous secondary-side signal isolation |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V and 5 V logic families without level shifters |
| Fail-Safe Default | Low output during VDD1 loss - ensures safe shutdown of downstream drivers or gate controllers |
| Operating Temperature | –40 to +125 °C - qualified for industrial environments including motor drives and power supplies |
Pinout & Package
SI8655BA-B-IS1 is housed in a RoHS-compliant narrow-body SOIC-16 package (5.3 mm body width, 10.3 mm length), with creepage/clearance ≥5.5 mm and reinforced insulation capability up to 1.0 kVRMS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to transmitter side; powers all five input buffers and RF modulator |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥5.5 mm for isolation compliance |
| IN1–IN5 | Digital input signals | CMOS-compatible inputs with Schmitt-trigger hysteresis (0.44 V typ) for noise rejection |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to receiver side; powers demodulator and five output drivers |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1; defines safety barrier |
| EN2 | Output enable control | Active-high enable for all five B-side outputs; internal 2 µA pull-up allows floating if unused |
| B1–B5 | Isolated digital outputs | 50 Ω nominal output impedance; tri-state when EN2 = low; default low during VDD1 loss |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift issues of optocouplers; no start-up delay or initialization sequence |
| Tri-state outputs with EN2 | Enables bus sharing and hot-swap capability in multi-device systems without contention or glitch risk |
| Fail-safe low-default mode | Guarantees known logic state (low) at B1–B5 when VDD1 fails-critical for safe shutdown in motor gate drivers |
| Ultra-low power at 1 Mbps | 1.5 mA per channel at 2.5 V / 1.6 mA at 5 V - reduces thermal load in dense PCB layouts |
| High CMTI immunity | 50 kV/µs common-mode transient immunity - maintains signal integrity in noisy motor drive and SMPS environments |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
|
Use Scenario: Gate driving for IGBTs/MOSFETs in three-phase inverters with isolated feedback. IC Role / Device Role / Timing Role: Isolates PWM signals from controller to gate driver while maintaining sub-10 ns timing accuracy and fail-safe low state during controller reset. Use Value: Prevents shoot-through faults during power-up/down; enables compact layout with no optocoupler latency or aging. |
Use Scenario: Feedback path from secondary-side voltage/current sensing to primary-side PWM controller in AC/DC converters. IC Role / Device Role / Timing Role: Transmits error amplifier output or digital status bits across isolation barrier with 150 Mbps capability and 5 ns minimum pulse width. Use Value: Supports fast-loop response in digitally controlled PSUs; eliminates optocoupler gain variation and bandwidth limitations. |
| Isolated Data Acquisition | Industrial PLC I/O Modules |
|
Use Scenario: Digital isolation between microcontroller and isolated ADC/DAC in medical or test equipment. IC Role / Device Role / Timing Role: Carries synchronized sample clocks and conversion-ready signals across isolation boundary with <2.5 ns channel-to-channel skew. Use Value: Preserves timing fidelity for multi-channel simultaneous sampling; avoids jitter-induced measurement errors. |
Use Scenario: Signal conditioning and isolation for digital input/output cards in programmable logic controllers. IC Role / Device Role / Timing Role: Provides five independent isolated channels for discrete sensor inputs or actuator outputs with Schmitt-trigger noise immunity. Use Value: Reduces external filtering components; supports direct connection to 24 V industrial field wiring with robust ESD/CMTI performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8650BB-B-IS1 | Same 5:0 channel count and NB SOIC-16 package, but 2.5 kVRMS isolation rating and identical low-default fail-safe mode | Required where higher working voltage (e.g., 250 VAC mains-referenced circuits) demands reinforced insulation certification | Select SI8650BB-B-IS1 when system-level safety standards require >1.0 kVRMS isolation; otherwise SI8655BA-B-IS1 offers cost and size advantage |
| ADUM140E0BRZ | Four-channel isolator in SOIC-16; 3.75 kVRMS; 150 Mbps; different pinout; no selectable fail-safe default (fixed high) | Suitable for 4-signal isolation needs (e.g., SPI bus); not drop-in due to channel count, pin assignment, and default-state mismatch | Choose ADUM140E0BRZ only if four channels suffice and system design accommodates fixed high-fail-safe behavior and alternate pin mapping |
Compared with SI8655BA-B-IS1, SI8650BB-B-IS1 provides higher isolation for safety-critical zones without changing footprint or logic behavior, while ADUM140E0BRZ trades one channel and fail-safe flexibility for broader industry qualification-but requires PCB redesign and firmware validation for default-state handling.
Availability
SI8655BA-B-IS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SI8655BA-B-IS1 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 high-reliability industrial and automotive signal isolation-replacing optocouplers with CMOS-based RF isolation that delivers superior speed, longevity, and temperature stability.
FAQ
What is the isolation rating and safety certification status of SI8655BA-B-IS1?
SI8655BA-B-IS1 has a 1.0 kVRMS isolation rating and is UL 1577 recognized, CSA Component Acceptance Notice 5A approved, and compliant with IEC 60950-1 and IEC 62368-1 for basic insulation. It is not certified for reinforced insulation, which requires ≥2.5 kVRMS. The device meets industrial safety requirements but is not rated for mains-connected primary-side isolation.
Does SI8655BA-B-IS1 require external components for basic operation?
No. SI8655BA-B-IS1 only requires 0.1 µF ceramic bypass capacitors on VDD1–GND1 and VDD2–GND2, placed adjacent to the pins. No pull-up/pull-down resistors, level shifters, or initialization firmware are needed-the device powers up cleanly with no start-up delay and begins passing data within 40 µs after VDD stabilization.
How does the fail-safe low-default mode function in SI8655BA-B-IS1?
In SI8655BA-B-IS1, when VDD1 is unpowered or drops below UVLO threshold (1.95 V), the B1–B5 outputs default to logic low-regardless of input state-provided VDD2 remains powered. This behavior is hard-coded by ordering option "BA" and ensures safe deactivation of downstream circuitry such as gate drivers or relay controls during controller power loss.
Can SI8655BA-B-IS1 operate with mismatched supply voltages on each side?
Yes. SI8655BA-B-IS1 supports independent 2.5–5.5 V operation on VDD1 and VDD2. For example, it can translate 3.3 V logic on the input side to 5 V outputs on the isolated side-or vice versa-without external level shifters. Input thresholds (VT+ = 1.67 V typ) and output drive strength (VOH = VDD2 – 0.4 V) ensure compatibility across this full range.
What is the maximum achievable data rate for reliable operation of SI8655BA-B-IS1?
SI8655BA-B-IS1 is specified for DC to 150 Mbps operation under all conditions. At 150 Mbps, it maintains 5 ns minimum pulse width, <4.5 ns pulse width distortion, and 350 ps peak eye diagram jitter. Real-world implementation requires controlled-impedance PCB traces (50 Ω ±10%) and proper termination to preserve signal integrity at this rate.
SI8655BA-B-IS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (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:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8655BA-B-IS1 FAQ
1.How can I place an order for SI8655BA-B-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8655BA-B-IS1 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-B-IS1 reliable?
The price and inventory of SI8655BA-B-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8655BA-B-IS1 is usually 5 days.
3.What payment methods are accepted for SI8655BA-B-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8655BA-B-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8655BA-B-IS1?
SI8655BA-B-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8655BA-B-IS1 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-B-IS1?
For technical support, including SI8655BA-B-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8655BA-B-IS1 requirements.
6.How does Aetrix verify that SI8655BA-B-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8655BA-B-IS1 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-B-IS1 meets industry standards.
7.What is the process for return or replacement of SI8655BA-B-IS1?
All SI8655BA-B-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8655BA-B-IS1, 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-B-IS1 part is unused and in its original packaging.
Return procedure for SI8655BA-B-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8655BA-B-IS1 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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