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Skyworks Solutions Inc. SI88320EC-ISR
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- Part No.:
- SI88320EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88320EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
SI88320EC-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, 18 ns typical propagation delay, and operates from –40 °C to +125 °C. It is used in industrial motor control systems requiring galvanic separation between gate drivers and MCU logic.
For engineers reviewing the SI88320EC-ISR datasheet, SI88320EC-ISR pinout, SI88320EC-ISR application, or SI88320EC-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package details, automotive-grade AEC-Q100 qualification status, and real-world design context for isolated power and signal transfer in high-noise environments.
Technical Context
The SI88320EC-ISR implements capacitive RF-based digital isolation using on/off keying modulation across a silicon dioxide barrier, enabling robust noise immunity and no startup initialization. Its integrated flyback-derived DC-DC controller supports low-voltage input (3–5.5 V) to isolated 3.3/5.0 V output, with external transformer, Schottky diode, and feedback resistor divider.
It provides programmable soft-start (via SS pin capacitor), shutdown control (SH_FC pin), and adjustable switching frequency (200–800 kHz via SH_FC/SS RC network). The device uses peak-current-mode control with internal error amplifier, VSNS feedback sensing on the secondary side, and COMP-pin Type-1 loop compensation (RCOMP = 49.9 kΩ, CCOMP calculated per crossover frequency).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - enables reinforced insulation per UL 1577, CSA 62368-1, and VDE 62368-1 |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and PWM feedback loops |
| Propagation Delay | 18 ns typical, 23 ns max - ensures tight timing alignment in real-time motor control and ADC sampling synchronization |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power isolated gate drivers, ADC references, and microcontroller peripherals on secondary side |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient conditions without derating |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - meets automotive reliability requirements including HTOL, TC, and ESD testing |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising common-mode noise in inverter switching nodes and IGBT gate drive circuits |
Pinout & Package
SI88320EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance ≥ 8.3 mm, certified for reinforced insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 15, 16, 17, 18 | GNDP, VSW, VDDP, VDDA, GNDA, GNDB, VDDB, NC, VSNS, COMP | Primary-side ground/power, internal switch output, primary logic supply, primary signal ground, secondary signal ground, secondary logic supply, no-connect, secondary-side feedback input, compensation network node |
| 7, 8, 13, 14 | NC, SH_FC, SS, NC | No-connect (pins 7, 14); shutdown/frequency control input (pin 8); soft-start timing capacitor connection (pin 13) |
| 9, 10, 11, 12 | A1, A2, B1, B2 | Unidirectional digital channel inputs (A1/A2) and outputs (B1/B2) - forward-direction only, no bidirectional capability |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive RF isolation barrier | Eliminates optocoupler aging and temperature drift; enables >100-year lifetime and stable timing over full temperature range |
| Secondary-side voltage sensing (VSNS) | Enables precise line/load regulation without optocouplers or secondary-side biasing circuitry - reduces BOM count by ≥3 components |
| Programmable soft-start (SS pin) | Controls inrush current during power-up to prevent transformer saturation and avoid false UVLO triggering on VDDA/VDDB |
| Shutdown/frequency control (SH_FC pin) | Allows system-level power sequencing and EMI optimization via external RC tuning - avoids fixed-frequency harmonics in sensitive analog sections |
| Integrated UVLO on both sides | Prevents metastable output states during brown-out; Side A and Side B operate independently - critical for fault-tolerant motor control |
Applications
| Industrial Motor Drives | Automotive Onboard Chargers (OBC) |
|---|---|
Use Scenario: Isolating PWM signals and current-sense feedback between MCU and IGBT/SiC gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Dual-channel isolator providing independent forward-path control (A1→B1, A2→B2) and secondary-side 5 V power for gate driver ICs. Use Value: 18 ns propagation delay enables <100 ns total control-loop latency; 5 kVRMS isolation withstands 1200 V DC bus transients. |
Use Scenario: Signal and power isolation between AC/DC front-end controller and DC/DC LLC secondary-side telemetry in EV OBC modules. IC Role / Device Role / Timing Role: Provides isolated 5 V supply and two digital channels for isolated ADC readout and fault signaling across 5 kVRMS barrier. Use Value: AEC-Q100 qualification ensures operation at 125 °C ambient; secondary-side VSNS feedback maintains ±1.5% output regulation under dynamic load steps. |
| Programmable Logic Controllers (PLCs) | Isolated Data Acquisition Systems |
Use Scenario: Digital I/O isolation in modular PLC backplanes where field-side sensors/actuators require galvanic separation from CPU backplane. IC Role / Device Role / Timing Role: Delivers isolated 3.3 V power and two digital channels for discrete input conditioning and output driver enable signals. Use Value: SOIC-20 wide-body package meets IEC 61000-4-5 surge immunity spacing requirements; 100 kV/µs CMTI prevents false triggering during lightning-induced surges. |
Use Scenario: Isolating SPI interface and reference voltage for precision ADCs measuring high-voltage battery strings in energy storage systems. IC Role / Device Role / Timing Role: Supplies clean 5 V to ADC's analog section while isolating digital SPI clock/data lines from noisy high-side measurement domain. Use Value: Sub-23 ns propagation delay preserves SPI timing margins at 20 MHz SCLK; integrated DC-DC eliminates need for separate isolated buck converter. |
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 3.3 V output; uses iCoupler® magnetic isolation; no programmable frequency or soft-start | Limited to low-power sensor interfaces; insufficient for gate driver biasing | Select when board space is constrained and output power ≤ 500 mW suffices |
| ISO7821FDWWR | 2-channel capacitive isolator only - no integrated DC-DC; requires external isolated power supply | Requires additional transformer, rectifier, and LDO - increases layout complexity and cost | Select when existing isolated power architecture exists and only signal isolation is needed |
Compared with ADUM6210ARWZ and ISO7821FDWWR, SI88320EC-ISR uniquely combines 2 W isolated power delivery, AEC-Q100 qualification, and programmable soft-start/frequency in a single SOIC-20 package - making it optimal for space-constrained, high-reliability automotive and industrial inverters where integrated power simplifies design and improves thermal performance.
Availability
SI88320EC-ISR is available at Aetrix Electronics and suitable for industrial motor drives, automotive onboard chargers, and isolated data acquisition systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SI88320EC-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 SI88320EC-ISR - was designed for high-reliability isolated power and signal transfer in electric vehicle traction inverters, industrial PLCs, and renewable energy systems demanding AEC-Q100 compliance and 5 kVRMS reinforcement.
FAQ
What is the maximum isolated output power supported by SI88320EC-ISR?
SI88320EC-ISR delivers up to 2 W average isolated output power at 5.0 V, sufficient to power gate drivers, isolated ADCs, and microcontroller peripherals on the secondary side. Peak power capability reaches 5 W briefly during startup, but sustained operation is rated at 2 W due to thermal limits in the SOIC-20 package. This is confirmed in the Si88x2x datasheet Section 1 and Figure 7 block diagram.
Does SI88320EC-ISR support bidirectional communication between its isolation channels?
No, SI88320EC-ISR provides two unidirectional digital channels only: A1 and A2 are inputs on the primary side, and B1 and B2 are corresponding outputs on the secondary side. There is no reverse-path capability. This is explicitly defined in the Functional Description (Section 2.2) and Pin Descriptions (Table 1), where A1–A2 are labeled "I/O signal channel" inputs and B1–B2 are outputs - with no provision for reverse signal flow.
How is the isolated DC-DC output voltage set for SI88320EC-ISR?
The isolated output voltage of SI88320EC-ISR is set by an external resistor divider (R1/R2) connected to the VSNS pin. The divider scales the output voltage to match the internal 1.22 V reference of the error amplifier. The formula is VOUT = 1.22 × (1 + R1/R2). This configuration is shown in Figure 7 and detailed in Section 2.3.6 of the datasheet, and applies directly to SI88320EC-ISR as a member of the Si8832x variant group.
What transformer is recommended for use with SI88320EC-ISR in a 5 V input to 5 V output configuration?
Skyworks validates the Coilcraft TA7618-AL transformer for SI88320EC-ISR in 4.5–5.5 V input to 3.0–5.5 V output applications. It provides 1:4 turns ratio, 64 nH max leakage inductance, 2.0 µH ±5% primary inductance, and 5 kVRMS isolation - matching SI88320EC-ISR's low-voltage configuration requirements. This part is listed in Table 2 of the datasheet and referenced in AN892 design guide.
Is SI88320EC-ISR pin-compatible with other Si8832x variants such as SI88321EC-ISR?
No, SI88320EC-ISR is not pin-compatible with SI88321EC-ISR or SI88322EC-ISR. As shown in Figure 2 of the datasheet, SI88320EC-ISR uses pins 7 (NC), 8 (SH_FC), 13 (SS), and 14 (NC), whereas SI88321EC-ISR assigns pins 7 (HF XMTR), 8 (HF RCVR), 13 (HF XMTR), and 14 (HF RCVR). The pin functions differ significantly across Si8832x variants, requiring unique PCB layouts for each part number.
SI88320EC-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
SI88320EC-ISR FAQ
1.How can I place an order for SI88320EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88320EC-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 SI88320EC-ISR reliable?
The price and inventory of SI88320EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88320EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88320EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88320EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88320EC-ISR?
SI88320EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88320EC-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 SI88320EC-ISR?
For technical support, including SI88320EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88320EC-ISR requirements.
6.How does Aetrix verify that SI88320EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88320EC-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 SI88320EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88320EC-ISR?
All SI88320EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88320EC-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 SI88320EC-ISR part is unused and in its original packaging.
Return procedure for SI88320EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88320EC-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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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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