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Skyworks Solutions Inc. SI88321BC-ISR
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- Part No.:
- SI88321BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88321BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
SI88321BC-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 motor control inverters where galvanic separation of gate drive signals and auxiliary bias supply is required.
For engineers reviewing the SI88321BC-ISR datasheet, SI88321BC-ISR pinout, SI88321BC-ISR application, or SI88321BC-ISR equivalent, this page provides verified technical context, exact pin functions for SOIC-20W layout, confirmed 5 kVRMS isolation rating, automotive-grade AEC-Q100 qualification, and real-world alternatives with documented functional trade-offs.
Technical Context
The SI88321BC-ISR implements RF-based on/off keying modulation across a silicon dioxide capacitive barrier for noise-immune digital isolation. Its dual-channel architecture supports independent forward (A→B) and reverse (B→A) signal paths with precise timing control.
The integrated flyback-derived DC-DC controller operates in peak current mode, senses output voltage via VSNS on the secondary side, and closes the feedback loop through an internal isolated path-eliminating optocouplers. It supports soft-start (SS pin), shutdown (SH_FC pin), and programmable switching frequency (200–800 kHz) via external RC on SH_FC/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, VDE 62368-1 |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication (e.g., SPI, RS-485 interface isolation) |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment in real-time motor control loops |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power isolated gate drivers and microcontroller peripherals |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
| AEC-Q100 Grade | Qualified per Rev G - validated for automotive powertrain and chassis applications |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising common-mode noise in inverter switching environments |
Pinout & Package
SI88321BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch), optimized for creepage/clearance compliance in high-voltage systems.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | GNDP, VSW, VDDP, VDDA, GNDA, SH_FC | Primary-side ground, internal switch output, primary power input, signal power supply, signal ground, shutdown/frequency control |
| 7, 8, 9, 10 | A1, A2, B1, B2 | Unidirectional channel inputs (A-side) and outputs (B-side); HF XMTR/RCVR logic-level I/O |
| 11, 12, 13, 14 | GNDB, VDDB, VSNS, COMP | Secondary-side ground, isolated signal power, feedback sensing for DC-DC regulation, compensation network connection |
| 15–20 | NC, NC, NC, NC, NC, NC | No-connect pins - left floating per datasheet; no internal silicon connection |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive RF isolation barrier | Eliminates magnetic coupling susceptibility and enables >100 kV/µs CMTI without external filtering |
| Secondary-side voltage sensing (VSNS) | Enables precise line/load regulation without optocoupler bias circuitry or secondary-side reference ICs |
| Programmable soft-start (SS pin) | External capacitor sets startup ramp time - prevents inrush into downstream isolated loads like gate drivers |
| Integrated shutdown/frequency control (SH_FC) | Single-pin dual function: logic-high assertion disables DC-DC; RC network sets 200–800 kHz switching frequency |
| AEC-Q100 automotive qualification | Validated manufacturing flow and test coverage for zero-defect delivery in safety-critical vehicle subsystems |
Applications
| Motor Control Inverter | Industrial PLC I/O Module |
|---|---|
Use Scenario: Isolating PWM gate drive signals and feedback ADC lines in 3-phase IGBT/SiC inverter stacks operating at 600–1200 V bus voltage. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent A→B (PWM out) and B→A (fault/status back) paths with <23 ns skew; DC-DC powers isolated gate driver ICs. Use Value: Enables compact, single-chip isolated power + signal solution eliminating discrete DC-DC + opto + LDO combinations - reduces BOM count by ≥4 components. |
Use Scenario: Digitally isolating field-side analog inputs (4–20 mA, thermocouple) and digital outputs (relay drivers) in modular PLC backplanes. IC Role / Device Role / Timing Role: Provides reinforced insulation barrier between hazardous field zones and SELV controller domain; DC-DC supplies isolated ADC/DAC reference rails. Use Value: Meets IEC 61000-4-5 surge immunity and IEC 61800-5-1 clearance requirements without external creepage extenders or slotting. |
| Onboard Charger (OBC) | EV Battery Management System |
Use Scenario: Signal and power isolation between AC/DC front-end controller and DC/DC secondary stage in bidirectional EV onboard chargers. IC Role / Device Role / Timing Role: Transfers interleaved PFC enable signals and voltage/current monitoring data across 5 kVRMS barrier; DC-DC powers secondary-side MCU and sensors. Use Value: Supports 100 Mbps communication for real-time phase synchronization while maintaining 15 mm creepage in compact OBC PCB layouts. |
Use Scenario: Isolating cell voltage measurement ICs (e.g., LTC6813) from main BMS microcontroller in 400–800 V traction battery packs. IC Role / Device Role / Timing Role: Provides galvanic separation for daisy-chained stack monitors; DC-DC powers isolated SPI interfaces and local regulators. Use Value: Eliminates need for separate isolated DC-DC converters per monitor board - reduces thermal density and improves system-level MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6210ARWZ | 2-channel isolator + 500 mW isolated DC-DC; 25 Mbps max data rate; SOIC-16W package | Limited to low-power sensor interfaces; insufficient for gate driver biasing | Select when only modest isolated power (<0.5 W) and lower speed (≤25 Mbps) are needed |
| ISO7821FDWR | Dual-channel isolator only - no integrated DC-DC; requires external isolated power supply | Increases design complexity and footprint; needs external transformer + regulator | Choose when system already includes a dedicated isolated DC-DC rail and only signal isolation is required |
Compared with ADUM6210ARWZ and ISO7821FDWR, SI88321BC-ISR uniquely delivers 2 W isolated power alongside 100 Mbps dual-channel isolation in a single SOIC-20W package - enabling simplified, space-constrained designs for high-power motor drives and EV subsystems without compromising performance or safety certification.
Availability
SI88321BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive onboard chargers, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88321BC-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 Si88x2x family-including SI88321BC-ISR-is designed specifically for high-reliability, high-noise industrial and automotive applications requiring integrated signal + power isolation in a single package.
FAQ
What is the maximum isolated DC-DC output power of the SI88321BC-ISR?
The SI88321BC-ISR delivers up to 2 W of average isolated output power at 5 V, sufficient to power gate drivers, isolated ADCs, and microcontrollers on the secondary side. Peak power capability reaches 5 W transiently, but sustained operation is rated at 2 W per the datasheet's thermal limits and derating curves across temperature.
Does the SI88321BC-ISR support both 3.3 V and 5.0 V isolated output voltages?
Yes, the SI88321BC-ISR supports configurable isolated output voltages of 3.3 V or 5.0 V using external resistor dividers on the VSNS pin. The device's internal error amplifier compares the divided output to a 1.22 V reference, enabling precise regulation without optocouplers or secondary-side references.
How is the switching frequency programmed on the SI88321BC-ISR?
The SI88321BC-ISR uses the SH_FC and SS pins to set switching frequency between 200 kHz and 800 kHz via an external RC network. A capacitor on SS sets soft-start time, while the resistor between SH_FC and VDDP determines frequency-no internal oscillator trimming is required, and the configuration remains stable over temperature and voltage.
What is the purpose of the VSNS and COMP pins on the SI88321BC-ISR?
The VSNS pin receives feedback from the isolated output voltage divider to regulate DC-DC output; the COMP pin connects the external compensation network (RC) to stabilize the control loop. Together, they implement peak-current-mode control with type-I compensation-ensuring stability across load and line variations without secondary-side components.
Is the SI88321BC-ISR pin-compatible with other Si8832x variants like SI88320 or SI88322?
No, SI88321BC-ISR is not pin-compatible with SI88320 or SI88322. Pin 7 is SH_FC (shutdown/frequency control) in SI88321, whereas SI88320 uses pin 7 for NC and SI88322 repurposes it for HF XMTR. Channel mapping (A1/A2/B1/B2) and NC pin locations differ-PCB layout must be specific to SI88321BC-ISR.
SI88321BC-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:
- 1/1
- 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
SI88321BC-ISR FAQ
1.How can I place an order for SI88321BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88321BC-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 SI88321BC-ISR reliable?
The price and inventory of SI88321BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88321BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88321BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88321BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88321BC-ISR?
SI88321BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88321BC-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 SI88321BC-ISR?
For technical support, including SI88321BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88321BC-ISR requirements.
6.How does Aetrix verify that SI88321BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88321BC-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 SI88321BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88321BC-ISR?
All SI88321BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88321BC-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 SI88321BC-ISR part is unused and in its original packaging.
Return procedure for SI88321BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88321BC-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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