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Skyworks Solutions Inc. SI88320BC-ISR
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- Part No.:
- SI88320BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88320BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
SI88320BC-ISR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W of regulated 3.3 V or 5.0 V output power across 5 kVRMS isolation. It features two unidirectional CMOS isolation channels (A1/A2 → B1/B2), 100 Mbps data rate, 23 ns max propagation delay, and operates from –40 °C to +125 °C. It is used in industrial motor control systems requiring galvanic separation of gate drivers and feedback signals.
For engineers reviewing the SI88320BC-ISR datasheet, SI88320BC-ISR pinout, SI88320BC-ISR application, or SI88320BC-ISR equivalent, this page provides verified functional specifications, SOIC-20 wide-body package details, confirmed automotive-grade AEC-Q100 qualification, and validated alternative options for isolated power + signal transfer in high-noise environments.
Technical Context
The SI88320BC-ISR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier for robust noise immunity and zero initialization latency. Its digital channels operate as transparent CMOS buffers with independent UVLO monitoring on both sides (VDDA and VDDB).
The integrated DC-DC controller uses peak-current-mode flyback topology with internal primary-side switches (VSW), external frequency/soft-start control via SH_FC and SS pins, and secondary-side voltage sensing through VSNS. Loop compensation is implemented externally at COMP with RCOMP = 49.9 kΩ and CCOMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577 certified) |
| Data Rate | Up to 100 Mbps - supports high-speed SPI, RS-485, and PWM feedback links |
| Propagation Delay | 23 ns max - enables tight timing control in real-time motor control loops |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated gate drivers and ADCs |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| Transient Immunity | 100 kV/µs (typical) - withstands fast EFT/burst events in PLC and inverter applications |
| AEC-Q100 Grade | Qualified per Rev G - meets automotive reliability requirements for safety-critical subsystems |
Pinout & Package
SI88320BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with reinforced creepage/clearance for 5 kVRMS isolation. Pin 1 marked with dot; isolation barrier separates pins 1–10 (primary side) from pins 11–20 (secondary side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GNDP | Primary-side power ground | Reference for VDDP and internal switch driver; must be low-inductance connected to VDDP bypass capacitor |
| 2 VSW | Internal power switch output | Drives transformer primary; rated for ≤5.5 V operation; requires snubber for EMI suppression |
| 3 VDDP | Primary-side power supply | Input for DC-DC controller (3.0–5.5 V); powers internal oscillator and logic |
| 4 VDDA | Primary-side signal supply | Powers A1/A2 input receivers; independent of VDDP; monitored by UVLO |
| 5 GNDA | Primary-side signal ground | Reference for A1/A2 inputs; must be tied directly to GNDP with minimal trace length |
| 7 A1 | Forward channel input | Unidirectional digital input (A→B); CMOS-compatible; 0–100 Mbps |
| 8 A2 | Forward channel input | Second unidirectional digital input (A→B); independent timing and fail-safe behavior |
| 11 GNDB | Secondary-side signal ground | Reference for B1/B2 outputs; isolated from GNDA; critical for noise rejection |
| 12 VDDB | Secondary-side signal supply | Powered by internal DC-DC; supplies B1/B2 output drivers; 3.3 V or 5.0 V regulated |
| 13 B1 | Forward channel output | Isolated CMOS output (A→B); matches A1 state with 23 ns max delay |
| 14 B2 | Forward channel output | Isolated CMOS output (A→B); matches A2 state; independent from B1 |
| 15 VSNS | Feedback sense input | Connects to resistor divider on secondary side; sets VDDB output voltage (e.g., 3.3 V or 5.0 V) |
| 16 COMP | Compensation node | External RC network (49.9 kΩ + CCOMP) stabilizes DC-DC control loop |
| 17 SH_FC | Shutdown/frequency control | High-level assertion disables DC-DC; RC time constant sets switching frequency (200–800 kHz) |
| 18 SS | Soft-start control | Capacitor to ground programs startup ramp time; prevents inrush current into VDDB load |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | Eliminates optocoupler aging and temperature drift; no start-up initialization required |
| Integrated flyback DC-DC controller | Reduces BOM count by eliminating external controller IC, MOSFET, and optocoupler feedback path |
| Secondary-side voltage sensing | Enables precise line/load regulation without optocoupler biasing circuitry or secondary LDOs |
| Programmable soft-start & shutdown | SS pin capacitor sets controlled VDDB ramp; SH_FC pin allows system-level power sequencing |
| AEC-Q100 qualified | Validated for automotive use including PPAP documentation, IMDS/CAMDS compliance, and HTOL testing |
| SOIC-20 wide-body package | Provides 8.3 mm creepage and 8.0 mm clearance - meets IEC 60664-1 for reinforced insulation |
Applications
| Industrial Motor Drives | Automotive On-Board Chargers |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback between MCU and IGBT/SiC half-bridge in servo drives. IC Role / Device Role / Timing Role: Dual-channel isolator providing timing-aligned A→B signal transfer with <23 ns skew; DC-DC powers isolated gate driver ICs. Use Value: Enables compact, high-efficiency 20 kHz+ switching with guaranteed noise immunity in 600 V bus environments. |
Use Scenario: Galvanically separating CAN communication and AC/DC control logic in EV OBC units operating at 400 V DC bus. IC Role / Device Role / Timing Role: Provides isolated 5 V supply and bidirectional digital signaling between primary-side controller and secondary-side metering ICs. Use Value: Meets automotive EMC requirements (ISO 7637-2, CISPR 25 Class 5) while reducing component count vs. discrete isolator + regulator solutions. |
| Programmable Logic Controllers | Isolated Data Acquisition Systems |
Use Scenario: Signal isolation for analog input modules receiving 4–20 mA sensor signals in factory automation cabinets. IC Role / Device Role / Timing Role: Supplies isolated 3.3 V to ADC reference and buffer stages; forwards digital configuration data from host CPU. Use Value: Eliminates ground loops and common-mode transients (>100 kV/µs) that corrupt 16-bit ADC measurements. |
Use Scenario: Isolating high-resolution sigma-delta ADCs (e.g., ADS131M04) in medical or test equipment with floating front-ends. IC Role / Device Role / Timing Role: Delivers clean, regulated 5 V to ADC's digital interface and reference buffer; transfers conversion data across isolation barrier. Use Value: Maintains >100 dB SNR by preventing digital switching noise from coupling into analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power + signal transfer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88321BC-ISR | Same SOIC-20 package and pinout; includes SH pin (not SH_FC) and no SS pin - fixed-frequency, no programmable soft-start | Suitable for cost-sensitive industrial designs where power sequencing is handled externally | Select when simplified DC-DC control (no frequency tuning or soft-start) reduces design complexity |
| ADUM6210ARWZ | SOIC-16 package; 2-channel isolator + 500 mW DC-DC; lower output power; no programmable frequency or soft-start | Better fit for space-constrained, low-power applications like isolated sensor interfaces | Choose when <500 mW isolated supply suffices and PCB area is premium |
Compared with SI88321BC-ISR, the SI88320BC-ISR adds programmable soft-start and frequency control for optimized EMI and inrush management; compared with ADUM6210ARWZ, it delivers 4× more isolated power and automotive qualification, at the cost of larger footprint and higher complexity.
Availability
SI88320BC-ISR is available at Aetrix Electronics and suitable for industrial motor drives, automotive on-board chargers, and isolated data acquisition systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88320BC-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 Si88x2x family was designed to replace optocoupler-based isolation + discrete DC-DC solutions in industrial and automotive systems demanding high data integrity, low EMI, and extended temperature operation.
FAQ
What is the maximum data rate supported by SI88320BC-ISR?
The SI88320BC-ISR supports a maximum data rate of 100 Mbps across both isolation channels. This is achieved using RF on/off keying modulation with a silicon dioxide capacitive barrier, enabling high-speed SPI, UART, and PWM signal transfer without timing skew or initialization delay. The 100 Mbps rating is specified over the full –40 °C to +125 °C temperature range and 5 kVRMS isolation barrier.
Does SI88320BC-ISR require external components to operate its DC-DC converter?
Yes, the SI88320BC-ISR requires external passive components to operate its integrated DC-DC converter: a miniature transformer (e.g., Coilcraft TA7618-AL), input/output capacitors (C2, C3), feedback resistors (R1/R2), and a compensation network (RCOMP = 49.9 kΩ + CCOMP) at the COMP pin. No external MOSFET or controller IC is needed - VSW drives the transformer primary directly for 3–5.5 V input operation.
How is the output voltage of the SI88320BC-ISR DC-DC converter set?
The output voltage of the SI88320BC-ISR DC-DC converter is set by an external resistor divider (R1/R2) connected to the VSNS pin on the secondary side. The internal error amplifier compares the divided voltage to a 1.22 V reference; typical configurations yield 3.3 V (R1 = 100 kΩ, R2 = 56.2 kΩ) or 5.0 V (R1 = 158 kΩ, R2 = 56.2 kΩ). This secondary-side sensing eliminates optocoupler dependency and improves regulation accuracy.
Can SI88320BC-ISR be used in automotive applications?
Yes, SI88320BC-ISR is AEC-Q100 qualified (Grade 1, –40 °C to +125 °C) and supports automotive production requirements including AIAG-compliant PPAP documentation, IMDS/CAMDS material declarations, and HTOL reliability testing. It is deployed in EV on-board chargers, battery management systems, and ADAS power domains where reinforced isolation and thermal robustness are mandatory.
What is the purpose of the SH_FC and SS pins on SI88320BC-ISR?
The SH_FC pin serves dual functions: asserting it high shuts down the DC-DC converter, and configuring it with an external RC network sets the switching frequency between 200 kHz and 800 kHz. The SS pin accepts an external capacitor to program soft-start duration, limiting inrush current during VDDB power-up. Both features enable precise system-level power sequencing and EMI optimization not available in fixed-function alternatives like SI88321BC-ISR.
SI88320BC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 40kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 18ns, 23ns
- Pulse Width Distortion (Max):
- 7ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88320BC-ISR FAQ
1.How can I place an order for SI88320BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88320BC-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 SI88320BC-ISR reliable?
The price and inventory of SI88320BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88320BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88320BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88320BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88320BC-ISR?
SI88320BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88320BC-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 SI88320BC-ISR?
For technical support, including SI88320BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88320BC-ISR requirements.
6.How does Aetrix verify that SI88320BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88320BC-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 SI88320BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88320BC-ISR?
All SI88320BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88320BC-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 SI88320BC-ISR part is unused and in its original packaging.
Return procedure for SI88320BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88320BC-ISR Tags
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