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Skyworks Solutions Inc. SI88621BC-ISR
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- Part No.:
- SI88621BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88621BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
SI88621BC-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, 5000 VRMS isolation rating, and 100 kV/µs transient immunity. It operates across –40 to +125 °C and is AEC-Q100 qualified for automotive use.
For engineers reviewing the SI88621BC-ISR datasheet, SI88621BC-ISR pinout, SI88621BC-ISR application, or SI88621BC-ISR equivalent, this device delivers verified isolated power and signal transfer in high-noise industrial and automotive systems where primary-side voltage exceeds 5.5 V and secondary-side regulation must be precise and optocoupler-free.
Technical Context
The SI88621BC-ISR implements a modified flyback DC-DC topology with external NMOS switch control via ESW pin and current sensing via RSN pin, enabling robust 24 V primary-side operation. Its RF-based digital isolation uses on/off keying across a silicon dioxide barrier, delivering 100 Mbps data rate and 18 ns typical propagation delay.
It features externally programmable soft-start (SS pin), shutdown (SH_FC pin), and switching frequency (SH_FC/SS RC network), with secondary-side voltage feedback through VSNS and loop compensation at COMP pin using 100 kΩ series resistance and calculated CCOMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, and VDE 62368-1. |
| DC-DC Input Range | Up to 24 V - supports high-voltage primary-side configurations without external regulator. |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power isolated logic and small peripherals without additional converters. |
| Digital Data Rate | 0–100 Mbps - enables high-speed serial interfaces including SPI, RS-485, and CAN FD physical layer isolation. |
| Propagation Delay | 18 ns typical - ensures tight timing alignment in real-time motor control and feedback loops. |
| Transient Immunity | 100 kV/µs (typical) - suppresses fast common-mode noise in inverter gate drive and PLC I/O modules. |
| Operating Temperature | –40 to +125 °C - validated for under-hood automotive and industrial ambient environments. |
| AEC-Q100 Grade | Qualified - meets stress test requirements for automotive electronics reliability and defect control. |
Pinout & Package
SI88621BC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance optimized for 5000 VRMS isolation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 18, 20, 19, 17, 16, 15 | Power & Control (Primary Side) | GNDP, RSN, ESW, VDDA, GNDA, VREGA, GNDB, VDDB, NC, VSNS, COMP - enable external FET-driven flyback control with secondary-side feedback and thermal-safe shutdown. |
| 7, 8, 14, 13 | Configuration & Timing | NC, SH_FC, SS, NC - support programmable shutdown, soft-start timing, and frequency tuning via external RC network. |
| 9, 10, 12, 11 | Digital Isolation Channels | A1, A2, B1, B2 - two unidirectional CMOS channels (A→B and B→A) with RF modulation for noise-immune bidirectional data transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated flyback controller with external FET drive | ESW pin drives external NMOS; RSN pin enables accurate current sensing for stable 24 V input operation. |
| Secondary-side voltage sensing | VSNS pin receives feedback directly from isolated output - eliminates optocouplers and improves load regulation by >3× vs. traditional solutions. |
| Programmable soft-start and shutdown | SS and SH_FC pins allow user-defined inrush current limiting and system-level power sequencing control. |
| High-EMI immunity architecture | RF on/off keying modulation provides >40 dB common-mode rejection - critical for motor drive gate isolation near IGBTs. |
| Automotive-grade manufacturing flow | Full AEC-Q100 qualification with AIAG PPAP documentation and IMDS/CAMDS compliance for Tier-1 supply chain traceability. |
Applications
| Industrial Motor Drives | Automotive Battery Management Systems |
|---|---|
Use Scenario: Isolating gate driver signals and feedback in 3-phase inverters with 24 V DC bus and 100 kHz PWM switching. IC Role / Device Role / Timing Role: SI88621BC-ISR provides isolated 5 V power and dual-channel signal transfer between MCU and SiC MOSFET drivers while maintaining <20 ns timing skew. Use Value: Enables direct replacement of discrete optocoupler + DC-DC combinations, reducing BOM count by 4 components and PCB area by 35%. |
Use Scenario: Monitoring cell voltages and temperature sensors across 96-cell EV battery packs with 800 V nominal bus voltage. IC Role / Device Role / Timing Role: SI88621BC-ISR isolates analog front-end ADC interface and supplies regulated 3.3 V to isolated sensor ICs on each module. Use Value: Achieves 5000 VRMS working voltage margin and AEC-Q100 reliability without external isolation amplifiers or LDOs. |
| Programmable Logic Controllers | Isolated Industrial Ethernet Nodes |
Use Scenario: Digital I/O isolation in DIN-rail mounted PLC backplanes handling 24 V field inputs and outputs with surge immunity. IC Role / Device Role / Timing Role: SI88621BC-ISR powers isolated input buffers and transmits status bits across the safety barrier with fail-safe default low outputs. Use Value: Meets IEC 61000-4-5 Level 4 surge (4 kV) and IEC 61000-4-4 EFT (2 kV) without external TVS or filtering. |
Use Scenario: Isolating PHY and MAC layers in PROFINET or EtherCAT slave nodes operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: SI88621BC-ISR delivers isolated 3.3 V power and transfers MII/RMII clock/data with sub-25 ns jitter accumulation. Use Value: Supports deterministic 1 µs cycle times in real-time industrial Ethernet by eliminating optocoupler propagation delay variation. |
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 | Integrated internal switches only; max 5 V input; no external FET drive or RSN sensing. | Limited to ≤5.5 V primary-side operation; unsuitable for 24 V bus applications. | Select when primary supply is ≤5 V and board space is constrained - no transformer driver needed. |
| ISO7821FDWR | No integrated DC-DC; requires external isolated power supply; 5000 VRMS isolation, 100 Mbps. | Demands separate isolated DC-DC (e.g., transformer + controller), increasing design complexity and footprint. | Select when power architecture already includes dedicated isolated supply and only signal isolation is required. |
Compared with ADUM6210ARWZ and ISO7821FDWR, the SI88621BC-ISR uniquely supports 24 V primary-side operation with external FET control and secondary-side feedback, making it the only option among the three that eliminates optocouplers *and* accommodates high-input-voltage industrial and automotive systems without redesigning the power stage.
Availability
SI88621BC-ISR is available at Aetrix Electronics and suitable for industrial motor drives, automotive battery management systems, programmable logic controllers, and isolated industrial Ethernet nodes requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for SI88621BC-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 product line was developed specifically for systems needing integrated signal isolation *and* isolated power in a single package - targeting automotive electrification, industrial automation, and energy infrastructure where safety certification and thermal robustness are mandatory.
FAQ
What is the maximum input voltage supported by the SI88621BC-ISR DC-DC converter?
The SI88621BC-ISR supports up to 24 V DC on the primary side, enabled by its external NMOS driver (ESW pin) and current sense input (RSN pin). This high-voltage capability distinguishes it from low-input variants like Si882xx/Si883xx and makes it suitable for automotive 12/24 V systems and industrial 24 V control rails without requiring pre-regulation.
Does the SI88621BC-ISR require an external transformer? If so, what are validated options?
Yes, the SI88621BC-ISR requires an external miniature transformer. Validated parts include UMEC UTB02250s (7–24 V in, 3.3–5.5 V out, 5 kVRMS), Coilcraft TA7788-AL (12 V in, 5/15 V out), and Pulse PA4897NL (8–24 V in/out, 5 kVRMS). All meet leakage inductance, turns ratio, and isolation rating requirements specified in Skyworks AN901.
How does the SI88621BC-ISR achieve secondary-side voltage regulation without optocouplers?
The SI88621BC-ISR uses an internal feedback path that encodes the VSNS pin voltage (derived from a resistor divider on the secondary side) and transmits the error signal across the isolation barrier to the primary-side controller. This closed-loop scheme replaces optocouplers entirely, improving long-term stability and reducing component count versus legacy isolated DC-DC designs.
What is the purpose of the SH_FC and SS pins on the SI88621BC-ISR?
SH_FC (pin 7) is the shutdown and frequency control input: driving it high disables the DC-DC converter; configuring it with an RC network sets switching frequency between 200–800 kHz. SS (pin 13) controls soft-start timing via an external capacitor, limiting inrush current during power-up - both features are exclusive to Si883xx/Si886xx families and not present in Si882xx/Si884xx.
Is the SI88621BC-ISR pin-compatible with other Si8862x variants such as SI88620BC-ISR or SI88622BC-ISR?
Yes, all Si8862x variants (SI88620BC-ISR, SI88621BC-ISR, SI88622BC-ISR) share identical SOIC-20 pinouts and mechanical footprints. Differences lie only in channel directionality (e.g., SI88621BC-ISR has two forward channels A1/A2 → B1/B2), not pin function or assignment - enabling layout reuse across functional variants.
SI88621BC-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
SI88621BC-ISR FAQ
1.How can I place an order for SI88621BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88621BC-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 SI88621BC-ISR reliable?
The price and inventory of SI88621BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88621BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88621BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88621BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88621BC-ISR?
SI88621BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88621BC-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 SI88621BC-ISR?
For technical support, including SI88621BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88621BC-ISR requirements.
6.How does Aetrix verify that SI88621BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88621BC-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 SI88621BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88621BC-ISR?
All SI88621BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88621BC-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 SI88621BC-ISR part is unused and in its original packaging.
Return procedure for SI88621BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88621BC-ISR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7741DWR
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ISO7741FDWR
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