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Skyworks Solutions Inc. SI8435BB-D-ISR
- Part No.:
- SI8435BB-D-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8435BB-D-ISR.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,057
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Product details
Overview
SI8435BB-D-ISR from Skyworks Solutions is a triple-channel, ultra-low-power digital isolator in a 16-pin wide-body SOIC package, supporting up to 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 2.5 kVRMS reinforced isolation. It operates across 2.70–5.5 V supply rails on both sides and delivers <6 mA per channel at 100 Mbps (5 V), enabling high-speed signal isolation in motor control and isolated power supplies.
For engineers reviewing the SI8435BB-D-ISR datasheet, SI8435BB-D-ISR pinout, SI8435BB-D-ISR application, or SI8435BB-D-ISR equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), channel skew (<1.8 ns), and real-world design context for industrial and automotive isolation use cases.
Technical Context
The SI8435BB-D-ISR implements capacitive coupling with on-chip RF modulation/demodulation for galvanic isolation between three independent channels. Its dual-supply architecture supports asymmetric voltage operation (e.g., 3.3 V on side 1, 5 V on side 2) without level-shifting circuitry.
It features an enable input per side (EN1/EN2) that places outputs in high-impedance state with <9.2 ns disable time, and achieves 25 kV/µs common-mode transient immunity - critical for noisy motor drive and inverter gate driver interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3 unidirectional isolated signal paths - enables serial interface isolation (e.g., SPI clock + two data lines) or redundant feedback paths. |
| Max Data Rate | 150 Mbps - supports high-resolution encoder interfaces and fast ADC/DAC sampling clocks across isolation barrier. |
| Propagation Delay | 3.0–9.5 ns (typ/max) - ensures sub-10 ns timing alignment for real-time control loops in servo drives. |
| Channel-Channel Skew | 0.5–1.8 ns (typ/max) - maintains phase coherence across multi-bit parallel signals like isolated PWM pairs. |
| Isolation Voltage | 2.5 kVRMS (1 min) - certified for reinforced insulation per UL 1577, CSA 5A, and VDE 0884-2, suitable for 600 VRMS working voltage systems. |
| Supply Range | 2.70–5.5 V on both VDD1 and VDD2 - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without external regulators. |
| CMTI | 25 kV/µs - rejects fast transients from IGBT switching noise in motor inverters and SMPS primary-side sensing. |
Pinout & Package
SI8435BB-D-ISR is housed in a 16-pin wide-body SOIC package (package width = 7.5 mm), providing 8.0 mm creepage and clearance for reinforced insulation compliance. Pin numbering follows standard SOIC-16 layout with pins 1–8 on one side (side 1) and pins 9–16 on the other (side 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Primary and secondary supply inputs | Independent 2.70–5.5 V rails - decoupling required per side; no shared ground or supply dependency. |
| GND1, GND2 | Primary and secondary ground references | Galvanically isolated grounds - essential for breaking ground loops in isolated DC-DC feedback or sensor interfaces. |
| IN1–IN3 | Input signal terminals (side 1) | Accept CMOS/TTL logic levels; VIH ≥ 2.0 V, VIL ≤ 0.8 V - compatible with most MCU GPIOs without level shifters. |
| OUT1–OUT3 | Output signal terminals (side 2) | Push-pull outputs with 85 Ω nominal impedance - matched to controlled-impedance PCB traces for clean 150 Mbps signaling. |
| EN1, EN2 | Enable inputs (side 1 and side 2) | Active-high control: asserts outputs when high; tri-states outputs within 9.2 ns when low - enables dynamic power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel isolation | Three independent, bidirectionally configurable signal paths in one package - reduces BOM count vs. discrete single-channel isolators. |
| Ultra-low power at speed | <6 mA per channel at 100 Mbps (5 V) - cuts thermal load in dense industrial modules where multiple isolators are used. |
| Precision timing | 1.5 ns pulse width distortion and 0.5 ns typical channel-channel skew - preserves signal integrity in high-speed serial protocols. |
| AEC-Q100 qualified | Rated for automotive temperature range (–40 to 125 °C at 150 Mbps) - validated for under-hood and EV inverter applications. |
| No start-up initialization | Valid output within 40 µs of power-on - eliminates boot-time delays in safety-critical systems requiring immediate isolation readiness. |
Applications
| Motor Control Systems | Isolated Switch-Mode Power Supplies |
|---|---|
|
Use Scenario: Isolating gate driver signals and current-sense feedback in 3-phase BLDC inverters. IC Role / Device Role / Timing Role: Transmits PWM commands from MCU to isolated gate drivers while returning analog current sense via isolated ADC interface. Use Value: Enables precise, low-skew timing (<1.8 ns skew) between PWM channels and prevents ground-loop noise from corrupting current measurements. |
Use Scenario: Providing feedback isolation in flyback or forward converters with optocoupler replacement. IC Role / Device Role / Timing Role: Transfers error amplifier output across isolation barrier to regulate primary-side controller. Use Value: Delivers 150 Mbps bandwidth and 25 kV/µs CMTI - supports faster loop response than optocouplers and resists EMI from transformer ringing. |
| Industrial Automation PLCs | Hybrid Electric Vehicle Battery Management |
|
Use Scenario: Isolating digital I/O and fieldbus communication (e.g., RS-485, CAN) in programmable logic controllers. IC Role / Device Role / Timing Role: Provides channel-isolated data paths for status reporting, command execution, and watchdog signaling. Use Value: Supports 2.7–5.5 V dual supply - interfaces directly with 3.3 V FPGA I/O and 5 V relay drivers without level translation. |
Use Scenario: Isolating cell voltage monitoring and balancing signals in high-voltage battery packs (up to 800 V). IC Role / Device Role / Timing Role: Transfers precision ADC readings and balancing enable signals across isolation barrier in BMS slave boards. Use Value: 2.5 kVRMS rating and 60-year lifetime at rated voltage ensure long-term reliability in high-reliability EV traction battery systems. |
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, 35 ns max propagation delay, 2.5 kVRMS, SOIC-16 wide body | Limited to 100 Mbps - unsuitable for >100 MHz encoder or fast SPI interfaces requiring 150 Mbps | Choose ADUM1311BRWZ only if system data rate ≤100 Mbps and legacy Analog Devices design reuse is prioritized. |
| ISO6731FDWR | 3-channel, 50 Mbps max, 25 ns max propagation delay, 5 kVRMS, SOIC-16 wide body | Half the data rate and higher propagation delay - compromises timing-critical closed-loop control latency | Select ISO6731FDWR only when higher isolation voltage (5 kVRMS) is mandatory and 150 Mbps performance is not required. |
Compared with ADUM1311BRWZ and ISO6731FDWR, SI8435BB-D-ISR uniquely delivers 150 Mbps speed with sub-10 ns delay and AEC-Q100 qualification - making it the only option among the three for automotive-grade, high-bandwidth motor control isolation.
Availability
SI8435BB-D-ISR is available at Aetrix Electronics and suitable for industrial automation systems, hybrid electric vehicles, and isolated switch-mode power supplies requiring stable component supply and long-lifecycle support.
Supply support for SI8435BB-D-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.
The Si84xx family was designed specifically for high-reliability, high-speed digital isolation in harsh environments - targeting motor drives, EV power systems, and industrial PLCs where timing precision and safety certification are non-negotiable.
FAQ
What is the maximum operating temperature for SI8435BB-D-ISR at full 150 Mbps data rate?
The SI8435BB-D-ISR is rated for –40 to 125 °C ambient temperature at 150 Mbps, per Table 1 in the datasheet. This specification applies with 15 pF load and 5 V supply on both sides. Derating is required above 125 °C or under heavier loading conditions.
Does SI8435BB-D-ISR support bidirectional communication on its channels?
SI8435BB-D-ISR provides three unidirectional channels. Bidirectional operation requires external logic or pairing with a complementary device. The datasheet does not define internal bidirectional capability - each channel is strictly input-to-output (INx → OUTx).
What safety certifications apply to SI8435BB-D-ISR?
SI8435BB-D-ISR carries UL 1577 (2500 VRMS), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2) certifications. All apply to the 2.5 kVRMS isolation rating and are production-tested to 3.0 kVRMS for 1 second.
How does the enable function work on SI8435BB-D-ISR?
SI8435BB-D-ISR has two enable inputs: EN1 controls side 1 (inputs), EN2 controls side 2 (outputs). When either is low, the corresponding side enters high-impedance state. Enable-to-output-valid delay is ≤8.0 ns, and enable-to-tri-state delay is ≤9.2 ns.
Is SI8435BB-D-ISR pin-compatible with other Si843x variants?
Yes - all Si843x devices (e.g., SI8430, SI8431, SI8435) in the same package variant (wide-body SOIC-16) share identical pinouts. SI8435BB-D-ISR is functionally and physically compatible with SI8430BB-D-ISR and SI8431BB-D-ISR, differing only in data rate and timing specs.
SI8435BB-D-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:
- Not For New Designs
- 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 (Typ)
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 9.5ns, 9.5ns
- Pulse Width Distortion (Max):
- 2.5ns
- Rise / Fall Time (Typ):
- 3.8ns, 2.8ns
- Voltage - Supply:
- 2.7V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8435BB-D-ISR FAQ
1.How can I place an order for SI8435BB-D-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8435BB-D-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 SI8435BB-D-ISR reliable?
The price and inventory of SI8435BB-D-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8435BB-D-ISR is usually 5 days.
3.What payment methods are accepted for SI8435BB-D-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8435BB-D-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8435BB-D-ISR?
SI8435BB-D-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8435BB-D-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 SI8435BB-D-ISR?
For technical support, including SI8435BB-D-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8435BB-D-ISR requirements.
6.How does Aetrix verify that SI8435BB-D-ISR is sourced from the original manufacturer or authorized distributors?
All SI8435BB-D-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 SI8435BB-D-ISR meets industry standards.
7.What is the process for return or replacement of SI8435BB-D-ISR?
All SI8435BB-D-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8435BB-D-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 SI8435BB-D-ISR part is unused and in its original packaging.
Return procedure for SI8435BB-D-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8435BB-D-ISR Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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