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Skyworks Solutions Inc. SI8435-B-IS
- Part No.:
- SI8435-B-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8435-B-IS.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
SI8435-B-IS from Skyworks Solutions is a triple-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, delivering 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2500 VRMS reinforced isolation. It operates across 2.70–5.5 V supply rails and supports industrial motor control, isolated ADC interfaces, and hybrid electric vehicle power inverters.
For engineers reviewing the SI8435-B-IS datasheet, SI8435-B-IS pinout, SI8435-B-IS application, or SI8435-B-IS equivalent, this page provides verified timing specs, safety certifications (UL/CSA/VDE), channel-channel skew (≤1.8 ns), and supply current at 100 Mbps (≤17.9 mA @ 5 V) to support high-speed, noise-immune system partitioning.
Technical Context
The SI8435-B-IS implements capacitive digital isolation with on-chip RF modulation/demodulation, enabling DC-to-150 Mbps operation without start-up initialization. Its dual-supply architecture (VDD1/VDD2) supports asymmetric voltage domains (e.g., 3.3 V logic side / 5 V MCU side) while maintaining precise timing across –40 °C to +125 °C.
Each of its three isolated channels features independent enable control, 85 Ω nominal output impedance for controlled-impedance PCB routing, and 25 kV/µs common-mode transient immunity. The device achieves ≤0.5 ns typical channel-channel skew and ≤6 ns minimum pulse width-critical for gate driver timing in IGBT-based inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 150 Mbps maximum - supports high-resolution encoder feedback and fast SPI isolation in servo drives. |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical signal transfer between MCU and isolated power stage. |
| Channel-Channel Skew | ≤1.8 ns - ensures synchronized sampling across multiple isolated analog inputs in multi-channel isolated ADC systems. |
| Isolation Voltage | 2500 VRMS - certified for reinforced insulation per UL 1577, CSA 5A, and VDE 0884-2, suitable for 600 VRMS working voltage applications. |
| Supply Current @ 100 Mbps | ≤17.9 mA (VDD1+VDD2, 5 V) - reduces thermal load in compact, sealed industrial enclosures. |
| CMTI | 25 kV/µs - rejects fast transients from switching power supplies and motor commutation noise. |
| Operating Temp | –40 °C to +125 °C - validated for under-hood automotive and industrial ambient conditions at full 150 Mbps data rate. |
Pinout & Package
SI8435-B-IS is housed in a 16-pin wide-body SOIC (WB-SOIC-16) package with 8.0 mm creepage/clearance, supporting 2500 VRMS reinforced insulation. Pin numbering follows standard SOIC convention (pin 1 = top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Power for input-side logic and channel 1–3 input receivers; accepts 2.70–5.5 V. |
| GND1 | Primary-side ground | Reference for VDD1 and all input-side signals; must be separated from GND2 by isolation barrier. |
| EN1, EN2, EN3 | Channel enable inputs | Active-high enables; tri-state outputs when low - allows dynamic channel gating in low-power modes. |
| IN1–IN3 | Input signal terminals | Digital inputs referenced to GND1; VIH ≥2.0 V, VIL ≤0.8 V - compatible with CMOS/LVTTL logic families. |
| VDD2 | Secondary-side supply | Power for output-side logic and channel 1–3 drivers; independent 2.70–5.5 V rail. |
| GND2 | Secondary-side ground | Reference for VDD2 and all output-side signals; galvanically isolated from GND1. |
| OUT1–OUT3 | Isolated output terminals | CMOS-compatible outputs with VOH ≥VDD2–0.4 V, VOL ≤0.4 V - drive loads up to 10 mA per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel isolation | Three independent bidirectional-capable channels in one WB-SOIC-16 footprint - reduces board space vs. discrete optocouplers or dual isolators. |
| Ultra-low power at speed | ≤6.3 mA per supply at 100 Mbps (5 V) - enables battery-backed or energy-harvested isolated sensor nodes without thermal derating. |
| Precision timing | ≤1.5 ns pulse width distortion and ≤2 ns propagation delay skew - preserves signal integrity in time-sensitive PWM or encoder interfaces. |
| AEC-Q100 qualified | Grade 1 (–40 °C to +125 °C) qualification - validates reliability for automotive traction inverter control and onboard chargers. |
| No initialization required | Instant-on operation after power-up - eliminates boot-time delays in safety-critical systems requiring immediate signal pass-through. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase IGBT inverters for HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: SI8435-B-IS transmits high-frequency PWM edges across isolation barrier with ≤9.5 ns delay and ≤1.8 ns inter-channel skew to maintain phase alignment. Use Value: Enables precise dead-time control and prevents shoot-through faults in high-power inverters operating at 20 kHz switching frequency. |
Use Scenario: Providing galvanic isolation between SAR ADCs (e.g., AD7606) and host microcontrollers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: SI8435-B-IS carries parallel 16-bit conversion results and BUSY/CONVST signals across isolation boundary with 150 Mbps aggregate bandwidth. Use Value: Maintains 1 MSPS sampling throughput without timing jitter degradation, preserving ±0.5 LSB integral nonlinearity in isolated measurement chains. |
| Hybrid Electric Vehicle Inverter | Isolated Switch-Mode Power Supply |
|
Use Scenario: Isolating fault signals (overcurrent, overtemperature) and gate drive commands between vehicle ECU and traction inverter module. IC Role / Device Role / Timing Role: SI8435-B-IS delivers AEC-Q100 Grade 1 reliability and 25 kV/µs CMTI to withstand EMI in 400 V battery systems. Use Value: Ensures functional safety compliance (ISO 26262 ASIL-B) for real-time fault response within <1 µs latency budget. |
Use Scenario: Isolating feedback signals (voltage/current sense) and PWM commands in digitally controlled LLC resonant converters for server PSUs. IC Role / Device Role / Timing Role: SI8435-B-IS transfers error amplifier outputs and synchronous rectifier timing across isolation barrier with <6 ns min pulse width support. Use Value: Enables zero-voltage switching (ZVS) optimization at >300 kHz switching frequencies without timing uncertainty-induced efficiency loss. |
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, 2500 VRMS, SOIC-16 wide body; higher 12 ns max propagation delay; no AEC-Q100 qualification. | Suitable for industrial PLCs but not automotive traction systems due to lack of AEC-Q100 Grade 1 rating. | Select when cost sensitivity outweighs need for 150 Mbps or automotive qualification. |
| ISO6731FDWR | 3-channel, 50 Mbps, 5000 VRMS, SOIC-16 wide body; lower CMTI (10 kV/µs); higher 15 ns propagation delay. | Better suited for high-isolation-voltage medical equipment than high-speed motor control where timing precision dominates. | Choose when reinforced insulation >3000 VRMS is mandatory and data rate ≤50 Mbps suffices. |
Compared with ADUM1311BRWZ and ISO6731FDWR, SI8435-B-IS uniquely combines 150 Mbps speed, AEC-Q100 Grade 1 qualification, and ≤9.5 ns propagation delay-making it optimal for automotive inverters and high-bandwidth industrial motion control where timing fidelity and automotive reliability coexist.
Availability
SI8435-B-IS is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle inverters, and isolated switch-mode power supplies requiring stable component supply and long-term lifecycle support.
Supply support for SI8435-B-IS 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 Si84xx family was designed specifically for high-speed, low-power galvanic isolation in demanding industrial and automotive environments-replacing optocouplers with robust, temperature-stable, and pin-compatible alternatives.
FAQ
What is the maximum data rate supported by SI8435-B-IS?
The SI8435-B-IS supports a maximum data rate of 150 Mbps across all three channels simultaneously. This is confirmed in Tables 3–5 of the Skyworks datasheet Rev. 1.7 for both 3.3 V and 5 V supply conditions, with timing validated at –40 °C to +125 °C ambient temperature.
Does SI8435-B-IS require external startup configuration or initialization?
No, SI8435-B-IS requires no start-up initialization. It begins passing valid data within 40 µs of power application (tSU ≤40 µs), as specified in Table 3. This instant-on behavior eliminates firmware boot dependencies and supports fail-safe signal transmission in safety-critical systems using SI8435-B-IS.
What safety certifications apply to SI8435-B-IS?
SI8435-B-IS is certified to UL 1577 (2500 VRMS, 1 min), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2). These approvals cover reinforced insulation up to 600 VRMS working voltage and are explicitly stated in Tables 6 and 7 of the official Skyworks datasheet.
Can SI8435-B-IS operate with different supply voltages on each side?
Yes, SI8435-B-IS supports independent VDD1 and VDD2 supplies ranging from 2.70 V to 5.5 V each. This allows mixed-voltage system interfacing-for example, 3.3 V FPGA logic on the input side and 5 V MCU peripherals on the output side-without level-shifting circuitry, as defined in Table 1 of the datasheet.
Is SI8435-B-IS suitable for automotive applications?
Yes, SI8435-B-IS is AEC-Q100 qualified Grade 1 (–40 °C to +125 °C), making it suitable for automotive applications including hybrid electric vehicle inverters and onboard chargers. Its 25 kV/µs CMTI and 2500 VRMS isolation meet functional safety requirements for ASIL-B systems, as documented in the "Features" and "Regulatory Information" sections.
SI8435-B-IS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 3/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 10Mbps
- Propagation Delay tpLH / tpHL (Max):
- 35ns, 35ns
- Pulse Width Distortion (Max):
- 7.5ns
- Rise / Fall Time (Typ):
- 2ns, 2ns
- Voltage - Supply:
- 2.375V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8435-B-IS FAQ
1.How can I place an order for SI8435-B-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8435-B-IS 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 SI8435-B-IS reliable?
The price and inventory of SI8435-B-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8435-B-IS is usually 5 days.
3.What payment methods are accepted for SI8435-B-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8435-B-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8435-B-IS?
SI8435-B-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8435-B-IS 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 SI8435-B-IS?
For technical support, including SI8435-B-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8435-B-IS requirements.
6.How does Aetrix verify that SI8435-B-IS is sourced from the original manufacturer or authorized distributors?
All SI8435-B-IS 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 SI8435-B-IS meets industry standards.
7.What is the process for return or replacement of SI8435-B-IS?
All SI8435-B-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8435-B-IS, 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 SI8435-B-IS part is unused and in its original packaging.
Return procedure for SI8435-B-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8435-B-IS 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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