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Skyworks Solutions Inc. SI8631ET-ISR
- Part No.:
- SI8631ET-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8631ET-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
SI8631ET-ISR from Skyworks is a triple-channel digital isolator with 2 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 5 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports up to 150 Mbps data rate, achieves ≤13 ns propagation delay, and features selectable high-default fail-safe mode - enabling robust signal integrity in isolated gate drivers and battery management systems.
For engineers reviewing the SI8631ET-ISR datasheet, SI8631ET-ISR pinout, SI8631ET-ISR application, or SI8631ET-ISR equivalent, this page delivers verified electrical specs, fail-safe behavior under power loss, CMTI ≥60 kV/µs performance, and precise timing parameters critical for motor control, EV traction inverters, and isolated ADC interfaces.
Technical Context
The SI8631ET-ISR uses RF-based on/off keying across a semiconductor isolation barrier - eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its architecture supports independent undervoltage lockout (UVLO) on both sides (VDD1/VDD2), with thresholds of 1.95–2.375 V rising and 1.88–2.325 V falling.
It implements Schmitt-trigger inputs (VT+ = 1.4–1.9 V, VT– = 1.0–1.4 V) and offers configurable enable control: EN1 governs A3 output, EN2 controls B1/B2 outputs. Default-high operation is implemented via 10 µA internal pull-ups on inputs/outputs per ordering option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation - meets VDE 0884-10, UL 1577, and IEC 60950-1 for safety-critical industrial and automotive systems. |
| Max Data Rate | 150 Mbps - enables high-speed serial communication in real-time motor control loops and fast ADC sampling interfaces. |
| Propagation Delay | ≤13 ns (typ. 8 ns) - ensures sub-20 ns end-to-end latency for time-sensitive feedback paths in power converters. |
| Channel-Channel Skew | ≤2.5 ns - maintains tight timing alignment between isolated signals in multi-phase gate drive applications. |
| CMTI | ≥60 kV/µs - sustains reliable operation during fast dv/dt transients in SiC/GaN-based inverters and on-board chargers. |
| Supply Voltage Range | 2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| Fail-Safe Mode | Default-high output state during VDD1 loss - prevents unintended gate turn-on in isolated half-bridge drivers. |
Pinout & Package
SI8631ET-ISR is housed in a RoHS-compliant wide-body SOIC-16 package (10.3 mm creepage/clearance), supporting reinforced insulation up to 5 kVRMS and rated for –40 °C to +125 °C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for input logic and RF transmitter; UVLO active below 1.88 V (falling) or above 2.375 V (rising). |
| GND1 | Input-side ground | Reference for A1, A2, EN1, and VDD1; requires local 0.1 µF bypass capacitor. |
| A1, A2 | Input channels | Digital inputs with Schmitt-trigger thresholds (1.0–1.9 V); tolerate slow edges and EMI in noisy environments. |
| EN1 | Enable for A3 output | Active-high control for third output channel; drives A3 into high-impedance when low. |
| VDD2 | Output-side supply | Power for RF receiver and output drivers; independent UVLO monitoring ensures safe output behavior. |
| GND2 | Output-side ground | Reference for B1, B2, EN2, and VDD2; requires separate 0.1 µF bypass capacitor. |
| B1, B2 | Output channels | CMOS-compatible outputs (VOH ≥ VDD2–0.4 V, VOL ≤ 0.4 V); 50 Ω nominal impedance for controlled-impedance routing. |
| EN2 | Enable for B1/B2 outputs | Active-high control for first two output channels; disables B1/B2 into high-Z when low. |
| A3 | Third output (VDD1 side) | Unidirectional output driven by VDD1 supply; default-high state maintained during VDD1 loss via internal 10 µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates startup delay and optical degradation; enables immediate data transmission after power-on with no initialization sequence. |
| Selectably high-default fail-safe | Guarantees logic-high output on A3 when VDD1 is unpowered - critical for preventing shoot-through in isolated half-bridge gate drivers. |
| Ultra-low power at 100 Mbps | 6.6–9.9 mA per side at 100 Mbps (2.5–5.5 V), reducing thermal load in compact battery management modules. |
| High CMTI immunity | ≥60 kV/µs common-mode transient immunity - maintains signal integrity during 1500 V step transients in SiC inverter switching nodes. |
| Wide temperature range | –40 °C to +125 °C operation - qualified per AEC-Q100 Grade 1 for automotive battery management and on-board charger applications. |
Applications
| Industrial Motor Control | EV Battery Management System |
|---|---|
|
Use Scenario: Isolating PWM signals between MCU and gate driver ICs in three-phase inverter stacks. IC Role / Device Role / Timing Role: SI8631ET-ISR transmits high-speed gate control signals across isolation barrier while maintaining <2.5 ns channel skew for synchronized phase switching. Use Value: Enables precise dead-time control and prevents cross-conduction in 650 V SiC half-bridges operating at 100 kHz switching frequency. |
Use Scenario: Isolating cell voltage measurement data and balancing commands between isolated BMS slave and master controllers. IC Role / Device Role / Timing Role: SI8631ET-ISR carries isolated SPI or UART traffic from isolated ADCs to host MCU, with fail-safe high output ensuring safe default state during sensor-side power loss. Use Value: Supports ASIL-B functional safety requirements via reinforced 5 kVRMS isolation and 60 kV/µs CMTI in 800 V battery packs. |
| Isolated Switch-Mode Power Supply | Traction Inverter Control Interface |
|
Use Scenario: Providing feedback isolation for secondary-side voltage/current sensing in LLC resonant converters. IC Role / Device Role / Timing Role: SI8631ET-ISR transmits error amplifier output and overcurrent flags across primary-secondary barrier with ≤13 ns propagation delay. Use Value: Enables fast-loop response (<500 ns total latency) for dynamic load regulation in 3.3 kW server PSUs. |
Use Scenario: Isolating torque command signals and fault reporting between vehicle controller and inverter gate driver stage. IC Role / Device Role / Timing Role: SI8631ET-ISR delivers isolated PWM and enable signals to dual-channel gate drivers, with EN2 enabling synchronous shutdown of both B1/B2 outputs. Use Value: Meets ISO 26262 ASIL-C requirements through AEC-Q100 qualification, reinforced VDE 0884-10 certification, and guaranteed fail-safe behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1311BRWZ | 3-channel, 100 Mbps max, 2.5–5.5 V, 3.75 kVRMS, default-low only, SOIC-16 narrow body | Lacks 5 kVRMS rating and AEC-Q100 qualification; unsuitable for automotive traction inverters requiring reinforced isolation. | Choose ADUM1311BRWZ only for cost-sensitive industrial SMPS where 3.75 kVRMS suffices and fail-safe polarity matches design. |
| ISO7731FDWR | 3-channel, 100 Mbps max, 1.71–5.5 V, 5 kVRMS, default-high available, SOIC-16 wide body, CMTI = 85 kV/µs | Higher CMTI but slower max data rate; lacks AEC-Q100 Grade 1 rating and automotive PPAP support. | Prefer ISO7731FDWR for ultra-noisy factory automation where CMTI > 80 kV/µs is mandatory, but verify timing budget permits 100 Mbps limit. |
Compared with ADUM1311BRWZ and ISO7731FDWR, SI8631ET-ISR uniquely combines 150 Mbps speed, AEC-Q100 Grade 1 qualification, and guaranteed 5 kVRMS reinforced isolation - making it the only option qualified for high-voltage EV traction inverter control loops requiring both bandwidth and automotive safety compliance.
Availability
SI8631ET-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV battery management systems, and isolated switch-mode power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SI8631ET-ISR 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 for high-reliability applications.
The SI8631ET-ISR belongs to Skyworks' Si863x family of ultra-low-power digital isolators, designed specifically for automotive and industrial systems demanding high-speed, low-latency, and safety-certified galvanic isolation in harsh electromagnetic environments.
FAQ
What is the isolation rating and safety certification status of SI8631ET-ISR?
SI8631ET-ISR is certified for 5 kVRMS reinforced isolation per VDE 0884-10, UL 1577, CSA Component Notice 5A, and IEC 60950-1. It meets all required creepage and clearance distances for wide-body SOIC-16 packaging and is approved for use in medical (IEC 60601-1) and industrial safety applications. SI8631ET-ISR carries full documentation for end-system certification including test reports and certificate numbers issued by accredited bodies.
Does SI8631ET-ISR require external components for stable operation?
Yes - SI8631ET-ISR requires a 0.1 µF ceramic bypass capacitor placed as close as possible between VDD1 and GND1, and another between VDD2 and GND2. No pull-up/down resistors are needed due to internal 10 µA pull-ups on A3, B1, and B2 in the ET variant. External series termination (50 Ω) is recommended only when driving long PCB traces with significant transmission-line effects.
How does the fail-safe mode function in SI8631ET-ISR during input-side power loss?
In SI8631ET-ISR, the "ET" suffix denotes default-high fail-safe behavior: when VDD1 is unpowered but VDD2 remains active, A3 output is pulled high via internal 10 µA current source. This ensures defined logic state for critical control signals - such as half-bridge enable lines - preventing undefined states that could cause shoot-through in power stages.
What is the maximum achievable data rate and associated timing jitter for SI8631ET-ISR?
SI8631ET-ISR supports up to 150 Mbps with peak eye diagram jitter of 350 ps and minimum pulse width of 5 ns. At 100 Mbps, propagation delay is typically 8 ns (max 13 ns), pulse width distortion is ≤4.5 ns, and channel-to-channel skew is ≤2.5 ns - enabling deterministic timing in closed-loop motor control and high-resolution isolated ADC interfaces.
Is SI8631ET-ISR qualified for automotive applications and what documentation is available?
Yes - SI8631ET-ISR is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C), manufactured using automotive-specific process flows, and supported with AIAG-compliant PPAP documentation, IMDS/CAMDS material declarations, and zero-defect methodology throughout production. Full qualification reports and test data are available upon request for OEM validation.
SI8631ET-ISR 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:
- 3
- Inputs - Side 1/Side 2:
- 1/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 60kV/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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8631ET-ISR FAQ
1.How can I place an order for SI8631ET-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8631ET-ISR 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 SI8631ET-ISR reliable?
The price and inventory of SI8631ET-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8631ET-ISR is usually 5 days.
3.What payment methods are accepted for SI8631ET-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8631ET-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8631ET-ISR?
SI8631ET-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8631ET-ISR 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 SI8631ET-ISR?
For technical support, including SI8631ET-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8631ET-ISR requirements.
6.How does Aetrix verify that SI8631ET-ISR is sourced from the original manufacturer or authorized distributors?
All SI8631ET-ISR 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 SI8631ET-ISR meets industry standards.
7.What is the process for return or replacement of SI8631ET-ISR?
All SI8631ET-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8631ET-ISR, 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 SI8631ET-ISR part is unused and in its original packaging.
Return procedure for SI8631ET-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8631ET-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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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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