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Skyworks Solutions Inc. SI8635BT-IS2
- Part No.:
- SI8635BT-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BT-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:1,062
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Product details
Overview
SI8635BT-IS2 from Skyworks is a triple-channel, unidirectional digital isolator with 5 kVRMS reinforced isolation, 150 Mbps data rate, and selectable fail-safe low-default output state. It features Schmitt-trigger inputs, 2.5–5.5 V dual-supply operation, and operates across –40 to +125 °C for use in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8635BT-IS2 datasheet, SI8635BT-IS2 pinout, SI8635BT-IS2 application, or SI8635BT-IS2 equivalent, this page delivers verified technical context, precise timing specs (8 ns typical propagation delay, 0.5 ns channel skew), isolation certification details (VDE 0884-10, UL 1577), and real-world automotive/industrial use cases - all mapped specifically to SI8635BT-IS2's wide-body SOIC-16 package and T-suffix reinforced insulation rating.
Technical Context
The SI8635BT-IS2 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its three isolated channels are unidirectional (3-input, 0-output on VDD1 side; 0-input, 3-output on VDD2 side), with no enable pins - matching the Si8635Bx series architecture per Table 3.2.
It supports reinforced insulation per VDE 0884-10 (10 kV surge capability) and achieves 50 kV/µs common-mode transient immunity at 1500 VCM. The device uses internal Schmitt-trigger inputs (1.23 V typical VT–, 1.67 V typical VT+) and maintains stable timing over temperature: propagation delay variation ≤ ±1 ns from –40 to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS reinforced (VDE 0884-10 certified, 10 kV surge capable) |
| Max Data Rate | 150 Mbps - supports high-speed SPI, UART, and PWM feedback in inverters |
| Propagation Delay | 8 ns typical - enables tight-loop timing in motor control and power supply feedback paths |
| Channel-Channel Skew | 0.5 ns max - ensures synchronized sampling across three isolated signals (e.g., phase currents) |
| Supply Voltage Range | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V gate drivers |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Fail-Safe Default | Low output during input-side power loss - prevents unintended activation in safety-critical systems |
Pinout & Package
SI8635BT-IS2 is housed in a RoHS-compliant 16-pin wide-body SOIC package (7.5 mm creepage/clearance), supporting reinforced insulation up to 5 kVRMS. Pin assignments follow the standard Si8635Bx layout with dedicated VDD1/GND1 and VDD2/GND2 pairs, three input channels (A1–A3) on Side 1, and three output channels (B1–B3) on Side 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2, A3 | Input signals (Side 1) | Accept 2.5–5.5 V logic; Schmitt-triggered for >400 mV hysteresis against EMI |
| B1, B2, B3 | Isolated output signals (Side 2) | Drive 50 Ω loads directly; default low when VDD1 = 0 V (fail-safe mode) |
| VDD1, GND1 | Input-side power supply | Power Side 1 circuitry; UVLO threshold 2.24 V (typical) prevents metastability |
| VDD2, GND2 | Output-side power supply | Power Side 2 outputs; independent of VDD1 - enables level-shifting between domains |
| NC (Pins 1, 2, 15, 16) | No-connect terminals | Not internally bonded; maintain clearance for creepage compliance in high-voltage designs |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and CMTI drift - guarantees 60-year life at rated working voltage |
| VDE 0884-10 reinforced rating | Enables single-package isolation in 1000 VDC+ systems (e.g., EV traction inverters) without external creepage extenders |
| 0.5 ns channel-channel skew | Supports simultaneous sampling of three-phase current/voltage with <1° phase error at 20 kHz |
| 50 kV/µs CMTI (min) | Suppresses false triggering in noisy motor drive environments with fast dV/dt transients |
| 1.5 mA/channel @ 1 Mbps (5 V) | Reduces thermal load in space-constrained BMS modules vs. optocoupler alternatives |
Applications
| Motor Control Feedback | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating three-phase current sense signals from an MCU in a 400 V inverter. IC Role / Device Role / Timing Role: SI8635BT-IS2 transmits analog-to-digital converter outputs across the isolation barrier with sub-ns skew to preserve phase alignment. Use Value: Enables accurate field-oriented control (FOC) by maintaining <0.5 ns inter-channel timing integrity across all three current paths. |
Use Scenario: Connecting a sigma-delta ADC's serial interface to an isolated host processor in medical imaging power supplies. IC Role / Device Role / Timing Role: SI8635BT-IS2 carries high-resolution ADC data (e.g., 24-bit, 20 MSPS) while rejecting common-mode noise from switching regulators. Use Value: Delivers 150 Mbps throughput and 50 kV/µs CMTI to sustain EN 60601-1 compliance without additional filtering. |
| Battery Management System | Traction Inverter Gate Drive |
|
Use Scenario: Isolating cell voltage monitoring and fault reporting signals between battery pack and controller in EVs. IC Role / Device Role / Timing Role: SI8635BT-IS2 provides fail-safe low-default outputs to prevent erroneous cell balancing commands during partial power loss. Use Value: Meets AEC-Q100 Grade 0 requirements and supports functional safety (ISO 26262 ASIL-B) via predictable default states. |
Use Scenario: Transmitting PWM gate signals from a DSP to IGBT/SiC half-bridge drivers in hybrid electric vehicle inverters. IC Role / Device Role / Timing Role: SI8635BT-IS2 delivers matched propagation delays (<8 ns) and minimal pulse distortion (<1.5 ns) to prevent shoot-through. Use Value: Enables 20+ kHz switching with <5 ns dead-time margin, improving efficiency and thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM131D0BRZ | 3-channel, 150 Mbps, 3.75 kVRMS (IEC 60747-5-5), no VDE 0884-10 rating | Lacks reinforced surge rating; unsuitable for 1000 VDC+ traction systems requiring VDE 0884-10 | Choose ADUM131D0BRZ only for cost-sensitive industrial applications below 600 V working voltage. |
| ISO7731FDWR | 3-channel, 100 Mbps, 5 kVRMS (UL/VDE/CSA), 10 ns propagation delay, no fail-safe low option | Lower speed and fixed default state limit use in high-frequency motor control with safety-critical defaults | Select ISO7731FDWR where 100 Mbps suffices and fail-safe behavior is managed externally. |
Compared with ADUM131D0BRZ and ISO7731FDWR, SI8635BT-IS2 uniquely combines VDE 0884-10 reinforcement, 150 Mbps speed, and factory-configured fail-safe low output - making it the only choice for AEC-Q100-compliant EV traction inverters requiring guaranteed safe shutdown on input power loss.
Availability
SI8635BT-IS2 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and isolated ADC/DAC interfaces requiring stable component supply across automotive and industrial production lifecycles.
Supply support for SI8635BT-IS2 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 Si863x family was engineered for high-reliability isolation in automotive and industrial power systems, delivering RF-based digital isolation that replaces optocouplers with superior lifetime, speed, and noise immunity.
FAQ
What is the isolation rating and certification status of SI8635BT-IS2?
SI8635BT-IS2 provides 5000 VRMS reinforced isolation and is certified to UL 1577, CSA Component Acceptance Notice 5A, VDE 0884-10 (reinforced), and CQC GB4943.1. Its VDE 0884-10 rating confirms 10 kV surge capability and suitability for functional safety applications up to 1000 VDC working voltage - a key differentiator versus basic IEC 60747-5-5 rated isolators.
Does SI8635BT-IS2 support bidirectional communication?
No, SI8635BT-IS2 is a unidirectional isolator with three input channels (A1–A3) on the VDD1 side and three output channels (B1–B3) on the VDD2 side. It does not include enable pins or reverse-direction paths. For bidirectional use, separate forward and reverse isolators (e.g., SI8631 variants) must be implemented - SI8635BT-IS2 is optimized for one-way signal transmission such as PWM or ADC data streaming.
What is the default output behavior of SI8635BT-IS2 during input-side power loss?
SI8635BT-IS2 is configured with a fail-safe "low" default output state. When VDD1 is unpowered but VDD2 remains active, all three outputs (B1–B3) drive logic low within 12 ns (tSD). This behavior is factory-set and eliminates the need for external pull-downs in safety-critical systems like EV battery disconnect controls or motor enable circuits.
How does SI8635BT-IS2 achieve high common-mode transient immunity?
SI8635BT-IS2 achieves ≥50 kV/µs CMTI through its RF modulation architecture and differential receiver design, which rejects fast dV/dt transients across the isolation barrier. Unlike capacitive isolators susceptible to charge injection, its carrier-based scheme maintains signal integrity even at 1500 V common-mode step edges - validated per VDE 0884-10 test conditions and critical for IGBT gate drive reliability.
Is SI8635BT-IS2 qualified for automotive applications?
Yes, SI8635BT-IS2 is AEC-Q100 qualified (Grade 0: –40 to +125 °C) and manufactured using automotive-specific process flows. It supports AIAG-compliant PPAP documentation and IMDS/CAMDS material declarations - meeting Tier 1 requirements for on-board chargers, battery management systems, and traction inverters in BEV/HEV platforms.
SI8635BT-IS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 3/0
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8635BT-IS2 FAQ
1.How can I place an order for SI8635BT-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BT-IS2 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 SI8635BT-IS2 reliable?
The price and inventory of SI8635BT-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BT-IS2 is usually 5 days.
3.What payment methods are accepted for SI8635BT-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BT-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BT-IS2?
SI8635BT-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BT-IS2 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 SI8635BT-IS2?
For technical support, including SI8635BT-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BT-IS2 requirements.
6.How does Aetrix verify that SI8635BT-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8635BT-IS2 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 SI8635BT-IS2 meets industry standards.
7.What is the process for return or replacement of SI8635BT-IS2?
All SI8635BT-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BT-IS2, 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 SI8635BT-IS2 part is unused and in its original packaging.
Return procedure for SI8635BT-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BT-IS2 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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