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Skyworks Solutions Inc. SI8431BB-C-IS1
- Part No.:
- SI8431BB-C-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8431BB-C-IS1.pdf
- Description:
- DGTL ISO 2500VRMS 3CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,374
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Product details
Overview
SI8431BB-C-IS1 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 with worst-case propagation delay <9.5 ns, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <7.0 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.
For engineers reviewing the SI8431BB-C-IS1 datasheet, SI8431BB-C-IS1 pinout, SI8431BB-C-IS1 application, or SI8431BB-C-IS1 equivalent, key selection criteria include its 2500 VRMS reinforced insulation rating, AEC-Q100 qualification, –40 to 125 °C operation at full speed, and compatibility with 3.3 V and 5 V logic domains without level-shifting.
Technical Context
The SI8431BB-C-IS1 implements capacitive isolation with on-chip RF modulation/demodulation circuitry, delivering deterministic timing performance across temperature and voltage. Its triple-channel architecture supports independent bidirectional or unidirectional signal paths, with all channels sharing a single enable input (EN) that places outputs in high-impedance state when asserted low.
It features integrated 85 Ω output impedance matching for controlled-impedance PCB trace routing, precise pulse-width distortion <2.5 ns (typ), and start-up time of 15–40 µs - eliminating boot-time initialization delays. Safety certification includes UL 1577 (2500 VRMS), CSA Component Notice 5A, and VDE IEC 60747-5-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - enables real-time feedback in servo drives and high-frequency PWM gate control loops. |
| Propagation Delay | 3.0–9.5 ns (max) - ensures sub-10 ns timing budget compliance for fast-loop digital power controllers. |
| Channel-Channel Skew | ≤1.8 ns (max) - maintains phase alignment across three isolated signals in multi-phase motor commutation. |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial mains-connected systems. |
| Supply Range | 2.70–5.5 V on both sides - supports interoperability between 3.3 V microcontrollers and 5 V analog front-ends. |
| CMTI | ≥25 kV/µs - rejects high dv/dt noise in inverter switching nodes without data corruption. |
| Operating Temp | –40 to 125 °C at 150 Mbps - validated for under-hood automotive and industrial ambient conditions. |
Pinout & Package
SI8431BB-C-IS1 is housed in a 16-pin wide-body SOIC package (WB SOIC-16), with creepage/clearance ≥8.0 mm and reinforced insulation rated to 2500 VRMS. Pin 1 is marked by a dot; pins 1–8 form the primary side (VDD1 domain), pins 9–16 the secondary side (VDD2 domain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Power for input-side logic and channel 1 transmitter; must be decoupled with 0.1 µF capacitor near pin. |
| GND1 | Primary-side ground | Reference return for VDD1 and input signals; separate from GND2 to maintain isolation barrier integrity. |
| IN1–IN3 | Input signal terminals | Accept CMOS/TTL-compatible logic levels; VIH ≥2.0 V, VIL ≤0.8 V across full supply range. |
| EN | Enable control input | Active-low; asserts high-impedance state on all outputs when pulled low - used for system-level power sequencing. |
| VDD2 | Secondary-side supply | Independent power domain for output drivers; supports different voltage than VDD1 (e.g., 3.3 V vs. 5 V). |
| GND2 | Secondary-side ground | Return path for VDD2 and output loads; galvanically isolated from GND1 by internal capacitive barrier. |
| OUT1–OUT3 | Isolated output terminals | CMOS-compatible outputs with VOH ≥VDD2–0.4 V, VOL ≤0.4 V; 85 Ω nominal output impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power at high speed | 7.0 mA per channel at 100 Mbps (5 V) - reduces thermal load in dense PCB layouts and extends battery life in portable isolators. |
| Precision timing | 0.5 ns channel-channel skew and 1.5 ns pulse-width distortion - preserves signal integrity in time-critical encoder or resolver interfaces. |
| No initialization required | Valid data within 40 µs of power-up - eliminates firmware wait states and simplifies boot sequence design. |
| AEC-Q100 qualified | Grade 1 (–40 to 125 °C) qualification - validates reliability for automotive subsystems including traction inverters and BMS isolation. |
| High CMTI immunity | 25 kV/µs minimum - suppresses false triggering caused by fast-switching SiC/GaN power devices. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Triple-channel isolator transmitting gate enable, fault status, and analog-to-digital converter serial clock/data across isolation barrier. Use Value: Sub-10 ns propagation delay and <2 ns skew ensure synchronized switching of upper/lower IGBTs, minimizing shoot-through risk. |
Use Scenario: Interfacing isolated sigma-delta ADCs (e.g., AMC1306) to host MCU over SPI or SSI bus. IC Role / Device Role / Timing Role: Transmitting high-resolution ADC conversion data and clock while blocking high-voltage transients from power stage. Use Value: 25 kV/µs CMTI prevents bit errors during rapid bus voltage transitions, preserving measurement accuracy. |
| Hybrid Electric Vehicle Inverter | Isolated Switch-Mode Power Supply |
|
Use Scenario: Providing isolated feedback for DC-link voltage sensing and phase current monitoring in traction inverters. IC Role / Device Role / Timing Role: Delivering redundant isolated signals for safety-critical monitoring circuits compliant with ISO 26262 ASIL-B. Use Value: AEC-Q100 Grade 1 qualification and 60-year lifetime at rated voltage support long-term automotive reliability requirements. |
Use Scenario: Isolating error amplifier output and PWM controller enable signals in flyback or LLC converters. IC Role / Device Role / Timing Role: Transferring control signals across primary-secondary boundary while maintaining tight regulation loop bandwidth. Use Value: 150 Mbps capability allows fast response to load transients; low propagation delay minimizes control loop latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1311BRWZ | Triple-channel, 100 Mbps max, 30 ns max propagation delay, 2500 VRMS isolation, SOIC-16 wide body. | Lower data rate and higher timing uncertainty limit use in >50 MHz feedback loops. | Preferred where cost sensitivity outweighs need for 150 Mbps or sub-10 ns timing. |
| ISO6731FDWR | Triple-channel, 50 Mbps max, 16 ns max propagation delay, 5000 VRMS isolation, SOIC-16 wide body. | Higher isolation rating but lower speed; not suitable for high-frequency PWM or fast ADC interfaces. | Chosen when enhanced safety margin (5 kVRMS) is prioritized over speed and timing precision. |
Compared with ADUM1311BRWZ and ISO6731FDWR, SI8431BB-C-IS1 uniquely balances 150 Mbps throughput, <10 ns propagation delay, and AEC-Q100 qualification - making it optimal for automotive and industrial systems demanding both speed and functional safety.
Availability
SI8431BB-C-IS1 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 SI8431BB-C-IS1 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 industrial automation, automotive electrification, and energy infrastructure applications.
FAQ
What is the maximum operating temperature for SI8431BB-C-IS1 at full 150 Mbps data rate?
The SI8431BB-C-IS1 is fully specified for continuous operation at –40 to 125 °C ambient temperature while sustaining 150 Mbps across all three channels. This rating is verified per Table 1 in the datasheet and applies to both 3.3 V and 5 V supply conditions with 15 pF load. Thermal derating curves in Figures 3–4 confirm no speed reduction is required within this range.
Does SI8431BB-C-IS1 require external level-shifting when interfacing 3.3 V MCU inputs with 5 V isolated outputs?
No, SI8431BB-C-IS1 does not require external level-shifting. Its input thresholds (VIH ≥2.0 V, VIL ≤0.8 V) are compatible with 3.3 V logic, and its outputs swing to VOH ≥VDD2–0.4 V - so with VDD2 = 5 V, outputs reach ≥4.6 V, meeting 5 V TTL/CMOS high-level requirements. The device inherently supports asymmetric supply configurations.
How does the EN pin function on SI8431BB-C-IS1, and what is its timing behavior?
The EN pin on SI8431BB-C-IS1 is an active-low enable that places all three outputs (OUT1–OUT3) into high-impedance state when asserted. Enable-to-data-valid delay is 5.0–8.0 ns (ten1), and enable-to-tri-state delay is 7.0–9.2 ns (ten2). This allows precise synchronization of isolation channel activation during system power sequencing or fault recovery.
Is SI8431BB-C-IS1 certified for reinforced insulation per IEC 61010-1, and what is its working voltage rating?
Yes, SI8431BB-C-IS1 is certified for reinforced insulation per IEC 61010-1 up to 600 VRMS working voltage, as confirmed in Table 6 (CSA section) and VDE IEC 60747-5-2 documentation. Its 2500 VRMS withstand rating and 560 Vpeak maximum working voltage (VIORM) meet safety requirements for measurement category II/III equipment.
What is the typical supply current consumption of SI8431BB-C-IS1 at 1 Mbps and 100 Mbps with 5 V supplies?
At 5 V supplies, SI8431BB-C-IS1 draws 2.8 mA per channel at 1 Mbps (DC + AC combined) and 7.0–8.8 mA per channel at 100 Mbps, per Table 3. These values include both VDD1 and VDD2 currents and are measured with 15 pF load on all outputs - enabling accurate power budgeting for low-noise isolated power domains.
SI8431BB-C-IS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- 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
SI8431BB-C-IS1 FAQ
1.How can I place an order for SI8431BB-C-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8431BB-C-IS1 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 SI8431BB-C-IS1 reliable?
The price and inventory of SI8431BB-C-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8431BB-C-IS1 is usually 5 days.
3.What payment methods are accepted for SI8431BB-C-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8431BB-C-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8431BB-C-IS1?
SI8431BB-C-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8431BB-C-IS1 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 SI8431BB-C-IS1?
For technical support, including SI8431BB-C-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8431BB-C-IS1 requirements.
6.How does Aetrix verify that SI8431BB-C-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8431BB-C-IS1 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 SI8431BB-C-IS1 meets industry standards.
7.What is the process for return or replacement of SI8431BB-C-IS1?
All SI8431BB-C-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8431BB-C-IS1, 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 SI8431BB-C-IS1 part is unused and in its original packaging.
Return procedure for SI8431BB-C-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8431BB-C-IS1 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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