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Skyworks Solutions Inc. SI88621EC-ISR
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- Part No.:
- SI88621EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88621EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,722
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Product details
Overview
SI88621EC-ISR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage conversion (e.g., 24 V input to 5 V isolated output), supporting up to 2 W average output power, 100 Mbps data rate, and 5000 VRMS isolation rating. It serves as a complete signal + power isolation solution in motor control inverters and industrial PLCs.
For engineers reviewing the SI88621EC-ISR datasheet, SI88621EC-ISR pinout, SI88621EC-ISR application, or SI88621EC-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package details, AEC-Q100 qualification status, and validated alternative options for automotive and industrial isolated power + signal designs.
Technical Context
The SI88621EC-ISR implements RF-based capacitive digital isolation across two unidirectional channels using on/off keying modulation, achieving 18 ns typical propagation delay and 100 kV/µs transient immunity. Its isolated DC-DC converter uses peak current mode control with external flyback topology, requiring an external NMOS switch (driven by ESW), current sense resistor (RSN), and transformer.
This variant belongs to the Si8862x family optimized for high-voltage primary-side operation (up to 24 V), featuring externally programmable soft-start (SS pin), shutdown (SH_FC pin), and switching frequency (via SH_FC/SS RC network). It senses output voltage on the secondary side via VSNS and closes the loop through internal isolation feedback - eliminating optocouplers.
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, and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time encoder feedback. |
| Propagation Delay | 18 ns typical, 23 ns max - enables precise timing-critical applications such as gate driver control and PWM synchronization. |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power secondary-side logic (VDDB), isolated ADCs, or small microcontrollers without external regulators. |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments with extended thermal margins. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - supports PPAP documentation and IMDS/CAMDS compliance for automotive OEM programs. |
| Package | SOIC-20 wide-body (10.3 mm × 15.4 mm) - provides 8.3 mm creepage/clearance for reinforced isolation barrier integrity. |
Pinout & Package
SI88621EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package with 1.27 mm pitch and reinforced creepage/clearance. Pin 1 is marked with a dot; pins 1–10 are on the left side (primary side), pins 11–20 on the right (secondary side), separated by an internal silicon dioxide isolation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GNDP | Primary-side power ground | Reference for VDDP and ESW; must be short-traced to VDDP bypass capacitor. |
| 2 RSN | Primary-side current sense input | Connects to shunt resistor for overcurrent protection and cycle-skipping control at light loads. |
| 3 ESW | External switch driver output | Drives external NMOS FET (Q1) in high-voltage flyback configuration; replaces internal VSW for >5.5 V inputs. |
| 4 VDDA | Primary-side signal supply | Must be ≤5.5 V; if unavailable, VREGA + external NPN can generate regulated VDDA. |
| 5 GNDA | Primary-side signal ground | Separate from GNDP; connects to A1/A2 reference; requires low-inductance tie to GNDP near IC. |
| 6 SH_FC | Shutdown and frequency control | High = shutdown; RC network with SS sets switching frequency (200–800 kHz) for EMI optimization. |
| 7 NC | No connect | Not bonded; leave floating or grounded per layout best practice. |
| 8 SS | Soft-start timing capacitor | External capacitor sets startup ramp time to limit inrush current into transformer primary. |
| 9 A1, A2 | Primary-side digital input channels | CMOS-compatible unidirectional inputs; support 0–100 Mbps; UVLO-protected during power-up. |
| 10 NC | No connect | Not bonded; leave floating or grounded. |
| 11 GNDB | Secondary-side signal ground | Reference for VDDB and B1/B2; isolated from GNDA; connects to COMP/VSNS return path. |
| 12 VDDB | Secondary-side signal supply | Powered by isolated DC-DC output; supplies B1/B2 I/O and optional external loads up to 2 W. |
| 13 B1, B2 | Secondary-side digital output channels | CMOS outputs referenced to VDDB; fail-safe default state configurable via external pull-ups. |
| 14 NC | No connect | Not bonded; leave floating or grounded. |
| 15 VSNS | Secondary-side feedback input | Resistor divider from VDDB feeds this pin; sets regulated output voltage (e.g., 5 V) via internal error amp. |
| 16 COMP | Compensation network connection | RC network (RCOMP = 100 kΩ + CCOMP) stabilizes flyback control loop; type-1 compensation required. |
| 17 NC | No connect | Not bonded; leave floating or grounded. |
| 18 VREGA | Voltage reference for external regulator | Used with external NPN to generate VDDA when primary supply >5.5 V; Zener-clamped at ~5.5 V. |
| 19 DNC/VREGB | Do-not-connect / secondary-side reference | Read as DNC unless VDDB >5.5 V; then used as reference for secondary-side external regulation. |
| 20 NC | No connect | Not bonded; leave floating or grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback DC-DC controller | Eliminates need for optocoupler-based feedback; enables ±1% load regulation and superior line regulation vs. traditional isolated DC-DC. |
| RF-based digital isolation | Capacitive SiO₂ barrier with on/off keying delivers 100 kV/µs CMTI and immunity to magnetic fields - critical for noisy motor drive environments. |
| Programmable soft-start & shutdown | SS pin capacitor sets controlled ramp; SH_FC pin allows system-level enable/disable of DC-DC - essential for functional safety sequencing. |
| External frequency control | RC network on SH_FC/SS adjusts switching frequency (200–800 kHz) to avoid EMI-sensitive bands in automotive EMC testing. |
| AEC-Q100 qualified SOIC-20 | Validated for automotive use with full PPAP support, IMDS listing, and -40°C to +125°C operation - no derating required. |
Applications
| Industrial Motor Drives | Automotive Battery Management Systems |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback in 3-phase inverter stacks for EV traction motors. IC Role / Device Role / Timing Role: Provides simultaneous isolated power (5 V @ 400 mA) and dual-channel signal isolation for PWM and fault reporting. Use Value: Enables single-chip isolation of both power and control paths, reducing BOM count and PCB area vs. discrete isolator + DC-DC solutions. |
Use Scenario: Signal and power isolation between MCU domain and high-voltage battery cell monitoring ICs (e.g., LTC6813). IC Role / Device Role / Timing Role: Delivers isolated 5 V supply and two digital channels for voltage/current sampling clocking and alert signaling. Use Value: Meets ASIL-B functional safety requirements via 5000 VRMS isolation, AEC-Q100 qualification, and diagnostic-ready fail-safe modes. |
| Programmable Logic Controllers | Isolated Industrial Sensors |
|
Use Scenario: Digital I/O isolation in modular PLC backplanes where field-side 24 V inputs must be safely interfaced to 3.3 V logic. IC Role / Device Role / Timing Role: Supplies isolated 5 V to field-side sensor conditioning circuits while transmitting status bits across barrier. Use Value: Supports 24 V field-side operation with integrated RSN/ESW driver - eliminates need for external high-side switch and current sense amplifier. |
Use Scenario: Isolating analog front-end ADCs and temperature sensors in harsh factory-floor environments with high EMI. IC Role / Device Role / Timing Role: Provides noise-immune digital interface (SPI clock/data) plus local 5 V rail for sensor signal conditioning. Use Value: 100 kV/µs CMTI prevents data corruption during fast-switching events (e.g., contactor engagement), ensuring measurement integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6210ARWZ | 2-channel isolator + 500 mW isolated DC-DC; SOIC-16; no programmable frequency or soft-start; lower output power. | Suitable for low-power sensor interfaces but insufficient for driving gate drivers or multiple downstream ICs. | Select when board space is constrained and <500 mW isolated power suffices; not recommended for automotive AEC-Q100 programs. |
| SI88620EC-ISR | Same SOIC-20 package and pinout; differs only in fail-safe default output state (low vs. high); identical DC-DC and isolation specs. | Used where B1/B2 must default to logic low on power loss or fault - e.g., safety-critical brake control activation. | Drop-in replacement except for fail-safe behavior; verify system-level fault response matches required safe state. |
Compared with ADUM6210ARWZ, SI88621EC-ISR delivers 4× more isolated power and automotive qualification; compared with SI88620EC-ISR, it offers complementary fail-safe polarity - enabling design flexibility without layout change.
Availability
SI88621EC-ISR is available at Aetrix Electronics and suitable for industrial motor drives, automotive battery management systems, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SI88621EC-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 wireless, automotive, and industrial markets.
The Si8862x product line was engineered specifically for high-reliability isolated power + signal integration in automotive and industrial systems - emphasizing AEC-Q100 compliance, reinforced insulation, and external flyback flexibility for 24 V input domains.
FAQ
What is the maximum isolated DC-DC output power of the SI88621EC-ISR?
The SI88621EC-ISR delivers up to 2 W average output power at 5 V on the secondary side. This is achieved using an external NMOS switch driven by the ESW pin, current sensing via RSN, and a properly selected flyback transformer - enabling direct powering of isolated gate drivers, ADCs, or microcontrollers without additional regulators.
Does the SI88621EC-ISR support programmable switching frequency?
Yes, the SI88621EC-ISR supports programmable switching frequency from 200 kHz to 800 kHz using an RC network connected between the SH_FC and SS pins. This capability allows EMI optimization during automotive EMC testing and helps avoid interference with sensitive communication bands in industrial systems.
How does the SI88621EC-ISR achieve reinforced insulation certification?
The SI88621EC-ISR achieves reinforced insulation certification (UL 1577, CSA 62368-1, VDE 62368-1) through its SOIC-20 wide-body package with 8.3 mm creepage/clearance, internal 5000 VRMS silicon dioxide capacitive barrier, and design validation across all stress conditions - including partial discharge, surge, and temperature cycling per IEC 60747-17.
Can the SI88621EC-ISR operate with a 24 V primary-side input?
Yes, the SI88621EC-ISR is explicitly designed for high-voltage-to-low-voltage configurations, including 24 V input to 5 V isolated output. It uses the ESW pin to drive an external NMOS switch and the RSN pin for current sensing - enabling robust operation beyond the 5.5 V limit of internal switches found in Si882xx/3xx variants.
What is the role of the VREGA pin on the SI88621EC-ISR?
The VREGA pin on the SI88621EC-ISR provides a stable ~5.5 V reference used with an external NPN transistor and resistive divider to generate a regulated VDDA supply when the primary-side input exceeds 5.5 V - eliminating the need for a separate linear regulator and simplifying power architecture in 12 V or 24 V systems.
SI88621EC-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
SI88621EC-ISR FAQ
1.How can I place an order for SI88621EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88621EC-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 SI88621EC-ISR reliable?
The price and inventory of SI88621EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88621EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88621EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88621EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88621EC-ISR?
SI88621EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88621EC-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 SI88621EC-ISR?
For technical support, including SI88621EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88621EC-ISR requirements.
6.How does Aetrix verify that SI88621EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88621EC-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 SI88621EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88621EC-ISR?
All SI88621EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88621EC-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 SI88621EC-ISR part is unused and in its original packaging.
Return procedure for SI88621EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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