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Skyworks Solutions Inc. SI88641EC-ASR
- Part No.:
- SI88641EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88641EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,775
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Product details
Overview
SI88641EC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, supporting 24 V primary-side input to 5 V or 24 V secondary-side output, up to 5 kVRMS isolation, 100 Mbps data rate, and 23 ns max propagation delay. It serves as a signal and power isolation solution in high-voltage industrial inverters and battery management systems.
For engineers reviewing the SI88641EC-ASR datasheet, SI88641EC-ASR pinout, SI88641EC-ASR application, or SI88641EC-ASR equivalent, this page delivers verified specifications, SOIC-24 wide-body package details, functional pin mapping, automotive-grade AEC-Q100 qualification, and real-world design context for high-voltage DC-DC + isolation integration.
Technical Context
The SI88641EC-ASR implements four unidirectional CMOS isolation channels using RF on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and no-startup initialization. Its isolated flyback DC-DC controller operates with external NMOS switch (driven by ESW), current sense (RSN), and programmable frequency/soft-start (SH_FC/SS).
This variant is configured for high-voltage-to-low-voltage or high-voltage-to-high-voltage conversion (e.g., 24 VIN → 5 VOUT or 24 VOUT), requiring external transformer, rectifier, and loop compensation (RCOMP = 100 kΩ, CCOMP per crossover frequency). Thermal shutdown and cycle-skipping at light loads are built-in.
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 in safety-critical systems. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD without timing bottlenecks. |
| Propagation Delay | 23 ns maximum - ensures tight timing alignment in motor control PWM feedback and real-time protection circuits. |
| DC-DC Output Power | Up to 5 W peak with external FET - powers isolated gate drivers, ADCs, and microcontrollers without auxiliary supplies. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial ambient environments. |
| AEC-Q100 Grade | Qualified to Grade 1 - meets automotive reliability requirements for hybrid/electric vehicle traction inverters and BMS. |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising common-mode noise in IGBT/SiC switching nodes. |
Pinout & Package
SI88641EC-ASR uses a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 2.35 mm height) with creepage/clearance optimized for 5 kVRMS isolation. Pin 1 marked via dot; pins 1–6 and 19–24 on primary side; pins 7–18 on secondary side across isolation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Digital isolator primary-side supply | Accepts 3.0–5.5 V; powers A1–A4 transmitter circuitry and internal logic; requires local bypass capacitor. |
| GNDA | Primary-side signal ground | Reference for VDDA and A1–A4; must be short-traced to GNDP per layout guidelines to minimize ground bounce. |
| A1–A4 | Primary-side digital inputs | Unidirectional CMOS-compatible inputs; drive HF XMTR stages; support 0–100 Mbps with 18 ns typical prop delay. |
| GNDP | DC-DC primary-side power ground | Return path for VDDP and ESW; separate from GNDA to avoid coupling noise into signal ground. |
| VDDP | DC-DC primary-side power input | Accepts 8–24 V; powers internal controller and ESW driver; requires ≥10 µF input capacitance. |
| ESW | External switch driver output | Drives gate of external NMOS Q1; enables high-voltage primary-side operation beyond 5.5 V. |
| RSN | Current sense input | Monitors primary-side switch current via shunt resistor; enables peak-current-mode control and overcurrent protection. |
| SH_FC | Shutdown and frequency control | High-active shutdown; RC time constant with SS sets PWM frequency between 200–800 kHz for EMI optimization. |
| SS | Soft-start control | Capacitor-connected node that programs startup ramp time to limit inrush current into transformer and output caps. |
| VREGA | Primary-side voltage reference | Internal Zener-regulated ~5.0 V output; used with external NPN to generate VDDA when no suitable supply exists. |
| GNDB | Secondary-side signal ground | Reference for VDDB and B1–B4; isolated from GNDA; connects to COMP and VSNS return paths. |
| VDDB | Digital isolator secondary-side supply | Powered by DC-DC output; supplies B1–B4 receivers; must be decoupled locally near GNDB. |
| B1–B4 | Secondary-side digital outputs | Unidirectional CMOS outputs; driven by HF RCVR stages; match A1–A4 channel mapping with precise timing. |
| VSNS | DC-DC feedback input | Connects to resistor divider on secondary-side output; enables closed-loop regulation without optocouplers. |
| COMP | Compensation network connection | Receives error amplifier output; requires RCOMP = 100 kΩ + CCOMP for Type-1 loop stability per AN901. |
| DNC/VREGB | Secondary-side voltage reference / Do Not Connect | Zener-referenced ~5.0 V; use only if VDDB > 5.5 V; otherwise leave floating or NC per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Fully integrated isolated DC-DC controller | Eliminates need for optocoupler-based feedback, reducing BOM count and improving long-term regulation stability over temperature. |
| Programmable soft-start and shutdown | Capacitor-controlled SS pin and logic-level SH_FC enable in-system power sequencing and fault-triggered converter disable. |
| RF-based digital isolation | On/off keying architecture provides superior CMTI (>100 kV/µs) and immunity to magnetic fields vs. transformer- or capacitor-based alternatives. |
| External FET drive (ESW) + current sense (RSN) | Supports scalable primary-side voltages up to 24 V while maintaining low-loss switching via discrete NMOS selection. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including traction inverters and battery monitoring, with PPAP and IMDS documentation support. |
Applications
| Industrial Inverter Control | Automotive Battery Management |
|---|---|
Use Scenario: Isolating gate-drive signals and feedback from high-voltage DC bus in 3-phase motor drives. IC Role / Device Role / Timing Role: SI88641EC-ASR provides simultaneous 4-channel signal isolation and 5 V isolated supply for gate drivers and current-sense amplifiers. Use Value: Enables compact, single-chip isolation + power solution eliminating separate DC-DC and optocouplers, reducing PCB area by >30%. |
Use Scenario: Monitoring cell voltages and temperatures across 96-cell EV battery packs with centralized MCU. IC Role / Device Role / Timing Role: SI88641EC-ASR isolates analog front-end SPI data and supplies isolated ADC reference voltage in each module. Use Value: Delivers reinforced insulation (5 kVRMS) and AEC-Q100 compliance required for ASIL-C functional safety architectures. |
| Isolated PLC I/O Module | Medical Imaging Power Supply |
Use Scenario: Digitally isolating 24 V sensor inputs and 24 V actuator outputs in distributed control cabinets. IC Role / Device Role / Timing Role: SI88641EC-ASR handles bidirectional signal isolation (A→B and B→A via channel pairing) and powers isolated transceivers. Use Value: Supports 24 VIN → 24 VOUT conversion to directly drive isolated 24 V logic, avoiding level-shifting components. |
Use Scenario: Providing isolated 5 V supply and digital interface for X-ray detector ASICs in high-voltage generator subsystems. IC Role / Device Role / Timing Role: SI88641EC-ASR isolates SPI configuration commands and delivers clean, regulated 5 V to noise-sensitive imaging sensors. Use Value: Achieves ultra-low emissions (<150 µV RMS) via dithered PWM and RF isolation, meeting IEC 60601-1 EMI limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421ARIZ-RL | 4-channel isolator + 500 mW isolated DC-DC; 2.5 kVRMS rating; no external FET drive or programmable frequency. | Limited to low-power isolated biasing (e.g., op-amp supplies); unsuitable for gate-driver power or >24 V input. | Select when system input ≤5.5 V and isolated load <500 mW; lower cost but lower power and isolation. |
| ISO7844FDWR | 4-channel isolator only - no integrated DC-DC; requires external isolated supply; 5 kVRMS; 100 Mbps. | Demands separate isolated DC-DC (e.g., SN6501 + transformer), increasing BOM, footprint, and design complexity. | Select when existing isolated power is available or when highest possible CMTI (>125 kV/µs) is mandatory over integrated power. |
Compared with ADUM6421ARIZ-RL and ISO7844FDWR, SI88641EC-ASR uniquely combines 5 W isolated power, 24 V input capability, programmable frequency/soft-start, and AEC-Q100 qualification - making it optimal for space-constrained, high-voltage automotive and industrial systems requiring self-contained isolation + power.
Availability
SI88641EC-ASR is available at Aetrix Electronics and suitable for industrial automation systems, electric vehicle traction inverters, and medical imaging power supplies requiring stable component supply, long lifecycle assurance, and automotive-grade traceability.
Supply support for SI88641EC-ASR 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 Si88x4x family was designed to replace optocoupler-based isolation + discrete DC-DC in high-reliability industrial and automotive systems, integrating robust RF isolation and flexible flyback control in a single SOIC package.
FAQ
What is the maximum input voltage supported by SI88641EC-ASR?
The SI88641EC-ASR supports primary-side input voltages from 8 V to 24 V DC, as confirmed in Section 2.3.12 of the datasheet. Its external FET driver (ESW) and current sense (RSN) enable safe operation at these higher voltages, unlike low-voltage variants such as Si882xx/3xx which are limited to ≤5.5 V input.
Does SI88641EC-ASR require an external transformer?
Yes, SI88641EC-ASR requires an external miniature transformer (e.g., UMEC UTB02250s or Coilcraft TA7788-AL) to implement the isolated flyback DC-DC function. The device integrates the controller and drivers but relies on external magnetics for galvanic isolation and energy transfer - no internal transformer is present.
What is the purpose of the DNC/VREGB pin on SI88641EC-ASR?
The DNC/VREGB pin on SI88641EC-ASR is a Zener-referenced voltage output (~5.0 V) intended only when the isolated DC-DC output exceeds 5.5 V. If VDDB ≤ 5.5 V, this pin must remain unconnected (DNC) per Table 1; misuse risks regulation instability or damage due to internal Zener conduction.
Can SI88641EC-ASR be used in AEC-Q100 automotive applications?
Yes, SI88641EC-ASR is AEC-Q100 qualified (Grade 1, –40 °C to +125 °C), with AIAG-compliant PPAP documentation and IMDS/CAMDS support. It is explicitly listed for hybrid/electric vehicle traction inverters and battery management systems in the datasheet's Automotive Applications section.
How is loop compensation implemented for the DC-DC converter in SI88641EC-ASR?
Loop compensation for SI88641EC-ASR uses a Type-1 network: a 100 kΩ resistor (RCOMP) from COMP to GNDB, plus an external capacitor (CCOMP) from COMP to GNDB. The capacitor value is calculated per AN901 using CCOMP = 6 / (2π × fC × 100 kΩ), where fC is the desired crossover frequency.
SI88641EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SI88641EC-ASR FAQ
1.How can I place an order for SI88641EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88641EC-ASR 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 SI88641EC-ASR reliable?
The price and inventory of SI88641EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88641EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88641EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88641EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88641EC-ASR?
SI88641EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88641EC-ASR 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 SI88641EC-ASR?
For technical support, including SI88641EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88641EC-ASR requirements.
6.How does Aetrix verify that SI88641EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88641EC-ASR 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 SI88641EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88641EC-ASR?
All SI88641EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88641EC-ASR, 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 SI88641EC-ASR part is unused and in its original packaging.
Return procedure for SI88641EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88641EC-ASR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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