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Skyworks Solutions Inc. SI8661EB-B-IUR
- Part No.:
- SI8661EB-B-IUR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8661EB-B-IUR.pdf
- Description:
- DGTL ISO 2500VRMS 6CH GP 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,662
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Product details
Overview
SI8661EB-B-IUR from Skyworks is a six-channel CMOS digital isolator with five input channels on VDD1 side and one output channel on VDD2 side, supporting up to 150 Mbps data rate, <10 ns propagation delay, and 2.5 kVRMS isolation. It operates from 2.5–5.5 V supplies across –40 to 125 °C and features Schmitt-trigger inputs and selectable high-default fail-safe mode-used in isolated motor control feedback loops and battery management system signal conditioning.
For engineers reviewing the SI8661EB-B-IUR datasheet, SI8661EB-B-IUR pinout, SI8661EB-B-IUR application, or SI8661EB-B-IUR equivalent, this page delivers verified electrical specs, QSOP-16 package details, fail-safe behavior under undervoltage, CMTI of 50 kV/µs, and direct alternatives for industrial and automotive isolation designs requiring precise timing and low-power operation.
Technical Context
The SI8661EB-B-IUR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V and hysteresis of 70 mV.
It provides five unidirectional input channels (VDD1 side) and one unidirectional output channel (VDD2 side), all with Schmitt-trigger inputs (VT+ = 1.67 V, VT– = 1.23 V) and 50 Ω nominal output impedance. The default-high fail-safe mode is implemented via internal pull-ups on all I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI clocked at ≥75 MHz with margin. |
| Propagation Delay | 8.0 ns typical - enables sub-10 ns timing-critical feedback paths in motor gate drivers. |
| Channel Configuration | 5 inputs / 1 output - matches asymmetric signal routing in isolated ADC monitoring + PWM return paths. |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, CSA 5A, VDE 0884-10, and IEC 62368-1 reinforced insulation. |
| Supply Voltage Range | 2.5–5.5 V - interoperable with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | 50 kV/µs - prevents false triggering in high-dV/dt environments like IGBT gate drive circuits. |
| Fail-Safe Default | High - ensures safe logic-high state on output during VDD1 loss, critical for enable/disable control signals. |
Pinout & Package
SI8661EB-B-IUR 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. Pin numbering follows counter-clockwise orientation from notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 5-channel transmitter side; bypass requires 0.1 µF capacitor to GND1. |
| GND1 | Input-side ground reference | Return path for VDD1 and all five input signals; must be separated from GND2 by isolation barrier. |
| IN1–IN5 | Digital input terminals | Accept 2.0–5.5 V logic; Schmitt-trigger inputs provide 440 mV hysteresis for noise rejection. |
| VDD2 | Output-side power supply | Supplies single-channel receiver; independent UVLO allows asymmetric power sequencing. |
| GND2 | Output-side ground reference | Return path for VDD2 and output; galvanically isolated from GND1 per safety certification. |
| OUT | Isolated digital output | Drives 50 Ω loads; default-high state maintained during VDD1 undervoltage per ordering option. |
| NC | No-connect pins (pins 8, 9, 16) | Internally unused; must remain unconnected per datasheet to avoid performance degradation. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift-ensures stable 60-year life at rated working voltage. |
| Selectably high fail-safe mode | Guarantees logic-high output during VDD1 loss, enabling safe shutdown in BMS fault detection paths. |
| Ultra-low power at 100 Mbps | 8.8 mA (VDD1) + 23 mA (VDD2) at 5 V - reduces thermal load in compact inverters and chargers. |
| Precise inter-channel timing | 0.5 ns channel-to-channel skew - maintains phase alignment across multi-sensor isolated ADC sampling. |
| Automotive-grade variant available | SI8661EB-AU qualified to AEC-Q100 Grade 0 (–40 to 150 °C) with PPAP and IMDS support. |
Applications
| Motor Control Feedback | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating encoder position signals and current-sense feedback from gate driver ICs in 3-phase inverter stages. IC Role / Device Role / Timing Role: Transmits high-frequency PWM edge timing and analog monitor status across isolation barrier with <10 ns delay. Use Value: Enables real-time overcurrent protection with ≤20 ns total loop latency, meeting IEC 61800-5-1 functional safety timing requirements. |
Use Scenario: Connecting sigma-delta modulator outputs (e.g., AD7403) to MCU-side digital filters in isolated power supplies. IC Role / Device Role / Timing Role: Carries 1-bit bitstream at 20 MSPS while rejecting common-mode noise from switching nodes. Use Value: Achieves >85 dB SNR in isolated DC-DC converters by maintaining 50 kV/µs CMTI and 5 ns minimum pulse width integrity. |
| Battery Management System | On-Board Charger Control |
Use Scenario: Transmitting cell voltage monitoring alerts and pack contactor control commands between MCU and high-voltage battery stack. IC Role / Device Role / Timing Role: Provides fail-safe high-level enable signal to precharge relay drivers during HV engagement sequences. Use Value: Ensures contactor remains de-energized during MCU reset or supply brownout, preventing unsafe HV energization. |
Use Scenario: Isolating AC-DC PFC controller communication and DC-link voltage sensing in EV on-board chargers. IC Role / Device Role / Timing Role: Routes bidirectional UART and analog sense signals across 2.5 kVRMS barrier with ±1.5 ns pulse distortion. Use Value: Supports 11 kW OBC designs compliant with ISO 15118 and UL 2202 by maintaining reinforced insulation and <13 ns max propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141E0BRZ | 4-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; no selectable fail-safe default; higher 100 Mbps supply current (12.5 mA/ch). | Lacks 5:1 channel asymmetry; unsuitable for dedicated feedback + control routing where SI8661EB-B-IUR's configuration reduces component count. | Choose when 4-channel symmetry suffices and SOIC-16 footprint is preferred over QSOP-16. |
| ISO6761QDWR | 6-channel, 100 Mbps, 5 kVRMS, SOIC-16; default-low only; AEC-Q100 Grade 1; higher 100 Mbps current (15.2 mA/ch at 5 V). | Higher isolation rating but lower speed; fixed low-fail-safe conflicts with BMS enable logic requiring high-default assertion. | Choose only if 5 kVRMS is mandatory and 100 Mbps meets system timing; verify fail-safe polarity compatibility. |
Compared with ADUM141E0BRZ and ISO6761QDWR, SI8661EB-B-IUR uniquely delivers 5:1 channel asymmetry, selectable high-fail-safe mode, and QSOP-16 packaging-reducing board space and eliminating external pull-up resistors in safety-critical BMS and motor control signal chains.
Availability
SI8661EB-B-IUR is available at Aetrix Electronics and suitable for industrial automation systems, medical electronics, and isolated switch mode supplies requiring stable component supply, long-lifecycle assurance, and automotive-grade traceability options.
Supply support for SI8661EB-B-IUR 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 Si866x family was designed specifically for high-reliability industrial and automotive isolation-emphasizing ultra-low power, precise timing, and robust CMTI performance in harsh EMI environments.
FAQ
What is the default output state of SI8661EB-B-IUR during VDD1 undervoltage?
The SI8661EB-B-IUR has a factory-configured default-high fail-safe mode. When VDD1 drops below UVLO– (2.16 V), the OUT pin remains logic high as long as VDD2 is powered-critical for maintaining safe states in battery disconnect controls. This behavior is confirmed in Table 3.1 and Ordering Guide entry for SI8661EB-B-IUR.
Does SI8661EB-B-IUR require external bypass capacitors?
Yes, SI8661EB-B-IUR requires a 0.1 µF ceramic capacitor between VDD1 and GND1, and another between VDD2 and GND2, placed within 3 mm of respective pins. This is mandatory per Section 3.3.1 to suppress supply transients and ensure stable RF modulation-omission causes increased jitter and potential startup failure.
What is the maximum ambient temperature rating for SI8661EB-B-IUR?
SI8661EB-B-IUR is rated for –40 to 125 °C ambient operation per Table 4.1. At 125 °C, derating applies: max data rate remains 150 Mbps, but supply current increases ~15% versus 25 °C. Full specification compliance is guaranteed across this range without external heatsinking.
Can SI8661EB-B-IUR replace SI8661BB-B-IUR in an existing design?
Yes, SI8661EB-B-IUR is pin-compatible and functionally identical to SI8661BB-B-IUR except for default output state: SI8661EB-B-IUR defaults high, while SI8661BB-B-IUR defaults low. No PCB changes are needed, but firmware must validate logic polarity on OUT during power transitions.
Is SI8661EB-B-IUR certified for reinforced insulation per IEC 62368-1?
Yes, SI8661EB-B-IUR carries VDE 0884-10 and IEC 62368-1 reinforced insulation certification at 2.5 kVRMS, validated per Table 4.6. This enables direct use in SELV/PELV boundaries of medical and industrial end equipment without additional system-level creepage verification.
SI8661EB-B-IUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 6
- Inputs - Side 1/Side 2:
- 5/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
SI8661EB-B-IUR FAQ
1.How can I place an order for SI8661EB-B-IUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8661EB-B-IUR 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 SI8661EB-B-IUR reliable?
The price and inventory of SI8661EB-B-IUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8661EB-B-IUR is usually 5 days.
3.What payment methods are accepted for SI8661EB-B-IUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8661EB-B-IUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8661EB-B-IUR?
SI8661EB-B-IUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8661EB-B-IUR 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 SI8661EB-B-IUR?
For technical support, including SI8661EB-B-IUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8661EB-B-IUR requirements.
6.How does Aetrix verify that SI8661EB-B-IUR is sourced from the original manufacturer or authorized distributors?
All SI8661EB-B-IUR 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 SI8661EB-B-IUR meets industry standards.
7.What is the process for return or replacement of SI8661EB-B-IUR?
All SI8661EB-B-IUR units undergo pre-shipment inspection (PSI). If there is an issue with SI8661EB-B-IUR, 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 SI8661EB-B-IUR part is unused and in its original packaging.
Return procedure for SI8661EB-B-IUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8661EB-B-IUR 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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